merge multiple repositories into an existing monorepo

- merged using: 'monorepo_add.sh services-real-time:services/real-time'
- see https://github.com/shopsys/monorepo-tools

services/real-time/.dockerignore

@@ -0,0 +1,7 @@
+node_modules/*
+gitrev
+.git
+.gitignore
+.npm
+.nvmrc
+nodemon.json

services/real-time/.eslintrc

@@ -0,0 +1,86 @@
+// this file was auto-generated, do not edit it directly.
+// instead run bin/update_build_scripts from
+// https://github.com/sharelatex/sharelatex-dev-environment
+{
+  "extends": [
+    "eslint:recommended",
+    "standard",
+    "prettier"
+  ],
+  "parserOptions": {
+    "ecmaVersion": 2018
+  },
+  "plugins": [
+    "mocha",
+    "chai-expect",
+    "chai-friendly"
+  ],
+  "env": {
+    "node": true,
+    "mocha": true
+  },
+  "rules": {
+    // TODO(das7pad): remove overrides after fixing all the violations manually (https://github.com/overleaf/issues/issues/3882#issuecomment-878999671)
+    // START of temporary overrides
+    "array-callback-return": "off",
+    "no-dupe-else-if": "off",
+    "no-var": "off",
+    "no-empty": "off",
+    "node/handle-callback-err": "off",
+    "no-loss-of-precision": "off",
+    "node/no-callback-literal": "off",
+    "node/no-path-concat": "off",
+    "prefer-regex-literals": "off",
+    // END of temporary overrides
+
+    // Swap the no-unused-expressions rule with a more chai-friendly one
+    "no-unused-expressions": 0,
+    "chai-friendly/no-unused-expressions": "error",
+
+    // Do not allow importing of implicit dependencies.
+    "import/no-extraneous-dependencies": "error"
+  },
+  "overrides": [
+    {
+      // Test specific rules
+      "files": ["test/**/*.js"],
+      "globals": {
+        "expect": true
+      },
+      "rules": {
+        // mocha-specific rules
+        "mocha/handle-done-callback": "error",
+        "mocha/no-exclusive-tests": "error",
+        "mocha/no-global-tests": "error",
+        "mocha/no-identical-title": "error",
+        "mocha/no-nested-tests": "error",
+        "mocha/no-pending-tests": "error",
+        "mocha/no-skipped-tests": "error",
+        "mocha/no-mocha-arrows": "error",
+
+        // chai-specific rules
+        "chai-expect/missing-assertion": "error",
+        "chai-expect/terminating-properties": "error",
+
+        // prefer-arrow-callback applies to all callbacks, not just ones in mocha tests.
+        // we don't enforce this at the top-level - just in tests to manage `this` scope
+        // based on mocha's context mechanism
+        "mocha/prefer-arrow-callback": "error"
+      }
+    },
+    {
+      // Backend specific rules
+      "files": ["app/**/*.js", "app.js", "index.js"],
+      "rules": {
+        // don't allow console.log in backend code
+        "no-console": "error",
+
+        // Do not allow importing of implicit dependencies.
+        "import/no-extraneous-dependencies": ["error", {
+          // Do not allow importing of devDependencies.
+          "devDependencies": false
+        }]
+      }
+    }
+  ]
+}

services/real-time/.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,38 @@
+<!-- BUG REPORT TEMPLATE -->
+
+## Steps to Reproduce
+<!-- Describe the steps leading up to when / where you found the bug. -->
+<!-- Screenshots may be helpful here. -->
+
+1.
+2.
+3.
+
+## Expected Behaviour
+<!-- What should have happened when you completed the steps above? -->
+
+## Observed Behaviour
+<!-- What actually happened when you completed the steps above? -->
+<!-- Screenshots may be helpful here. -->
+
+## Context
+<!-- How has this issue affected you? What were you trying to accomplish? -->
+
+## Technical Info
+<!-- Provide any technical details that may be applicable (or N/A if not applicable). -->
+
+* URL:
+* Browser Name and version:
+* Operating System and version (desktop or mobile):
+* Signed in as:
+* Project and/or file:
+
+## Analysis
+<!--- Optionally, document investigation of / suggest a fix for the bug, e.g. 'comes from this line / commit' -->
+
+## Who Needs to Know?
+<!-- If you want to bring this to the attention of particular people, @-mention them below. -->
+<!-- If a user reported this bug and should be notified when it is fixed, provide the Front conversation link. -->
+
+-
+-

services/real-time/.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,48 @@
+
+<!-- ** This is an Overleaf public repository ** -->
+
+<!-- Please review https://github.com/overleaf/overleaf/blob/master/CONTRIBUTING.md for guidance on what is expected of a contribution. -->
+
+### Description
+
+
+
+#### Screenshots
+
+
+
+#### Related Issues / PRs
+
+
+
+### Review
+
+
+
+#### Potential Impact
+
+
+
+#### Manual Testing Performed
+
+- [ ]
+- [ ]
+
+#### Accessibility
+
+
+
+### Deployment
+
+
+
+#### Deployment Checklist
+
+- [ ] Update documentation not included in the PR (if any)
+- [ ]
+
+#### Metrics and Monitoring
+
+
+
+#### Who Needs to Know?

services/real-time/.github/dependabot.yml

@@ -0,0 +1,23 @@
+version: 2
+updates:
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "daily"
+
+    pull-request-branch-name:
+      # Separate sections of the branch name with a hyphen
+      # Docker images use the branch name and do not support slashes in tags
+      # https://github.com/overleaf/google-ops/issues/822
+      # https://docs.github.com/en/github/administering-a-repository/configuration-options-for-dependency-updates#pull-request-branch-nameseparator
+      separator: "-"
+
+    # Block informal upgrades -- security upgrades use a separate queue.
+    # https://docs.github.com/en/github/administering-a-repository/configuration-options-for-dependency-updates#open-pull-requests-limit
+    open-pull-requests-limit: 0
+
+    # currently assign team-magma to all dependabot PRs - this may change in
+    # future if we reorganise teams
+    labels:
+      - "dependencies"
+      - "type:maintenance"

services/real-time/.gitignore

@@ -0,0 +1,5 @@
+node_modules
+forever
+
+# managed by dev-environment$ bin/update_build_scripts
+.npmrc

services/real-time/.mocharc.json

@@ -0,0 +1,3 @@
+{
+  "require": "test/setup.js"
+}

services/real-time/.nvmrc

@@ -0,0 +1 @@
+12.22.3

services/real-time/.prettierrc

@@ -0,0 +1,11 @@
+# This file was auto-generated, do not edit it directly.
+# Instead run bin/update_build_scripts from
+# https://github.com/sharelatex/sharelatex-dev-environment
+{
+  "arrowParens": "avoid",
+  "semi": false,
+  "singleQuote": true,
+  "trailingComma": "es5",
+  "tabWidth": 2,
+  "useTabs": false
+}

services/real-time/Dockerfile

@@ -0,0 +1,23 @@
+# This file was auto-generated, do not edit it directly.
+# Instead run bin/update_build_scripts from
+# https://github.com/sharelatex/sharelatex-dev-environment
+
+FROM node:12.22.3 as base
+
+WORKDIR /app
+
+FROM base as app
+
+#wildcard as some files may not be in all repos
+COPY package*.json npm-shrink*.json /app/
+
+RUN npm ci --quiet
+
+COPY . /app
+
+FROM base
+
+COPY --from=app /app /app
+USER node
+
+CMD ["node", "--expose-gc", "app.js"]

services/real-time/LICENSE

@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+our General Public Licenses are intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  Developers that use our General Public Licenses protect your rights
+with two steps: (1) assert copyright on the software, and (2) offer
+you this License which gives you legal permission to copy, distribute
+and/or modify the software.
+
+  A secondary benefit of defending all users' freedom is that
+improvements made in alternate versions of the program, if they
+receive widespread use, become available for other developers to
+incorporate.  Many developers of free software are heartened and
+encouraged by the resulting cooperation.  However, in the case of
+software used on network servers, this result may fail to come about.
+The GNU General Public License permits making a modified version and
+letting the public access it on a server without ever releasing its
+source code to the public.
+
+  The GNU Affero General Public License is designed specifically to
+ensure that, in such cases, the modified source code becomes available
+to the community.  It requires the operator of a network server to
+provide the source code of the modified version running there to the
+users of that server.  Therefore, public use of a modified version, on
+a publicly accessible server, gives the public access to the source
+code of the modified version.
+
+  An older license, called the Affero General Public License and
+published by Affero, was designed to accomplish similar goals.  This is
+a different license, not a version of the Affero GPL, but Affero has
+released a new version of the Affero GPL which permits relicensing under
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+
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+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Remote Network Interaction; Use with the GNU General Public License.
+
+  Notwithstanding any other provision of this License, if you modify the
+Program, your modified version must prominently offer all users
+interacting with it remotely through a computer network (if your version
+supports such interaction) an opportunity to receive the Corresponding
+Source of your version by providing access to the Corresponding Source
+from a network server at no charge, through some standard or customary
+means of facilitating copying of software.  This Corresponding Source
+shall include the Corresponding Source for any work covered by version 3
+of the GNU General Public License that is incorporated pursuant to the
+following paragraph.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the work with which it is combined will remain governed by version
+3 of the GNU General Public License.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU Affero General Public License from time to time.  Such new versions
+will be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU Affero General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU Affero General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU Affero General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<http://www.gnu.org/licenses/>.

services/real-time/Makefile

@@ -0,0 +1,90 @@
+# This file was auto-generated, do not edit it directly.
+# Instead run bin/update_build_scripts from
+# https://github.com/sharelatex/sharelatex-dev-environment
+
+BUILD_NUMBER ?= local
+BRANCH_NAME ?= $(shell git rev-parse --abbrev-ref HEAD)
+PROJECT_NAME = real-time
+BUILD_DIR_NAME = $(shell pwd | xargs basename | tr -cd '[a-zA-Z0-9_.\-]')
+
+DOCKER_COMPOSE_FLAGS ?= -f docker-compose.yml
+DOCKER_COMPOSE := BUILD_NUMBER=$(BUILD_NUMBER) \
+	BRANCH_NAME=$(BRANCH_NAME) \
+	PROJECT_NAME=$(PROJECT_NAME) \
+	MOCHA_GREP=${MOCHA_GREP} \
+	docker-compose ${DOCKER_COMPOSE_FLAGS}
+
+DOCKER_COMPOSE_TEST_ACCEPTANCE = \
+	COMPOSE_PROJECT_NAME=test_acceptance_$(BUILD_DIR_NAME) $(DOCKER_COMPOSE)
+
+DOCKER_COMPOSE_TEST_UNIT = \
+	COMPOSE_PROJECT_NAME=test_unit_$(BUILD_DIR_NAME) $(DOCKER_COMPOSE)
+
+clean:
+	-docker rmi ci/$(PROJECT_NAME):$(BRANCH_NAME)-$(BUILD_NUMBER)
+	-docker rmi gcr.io/overleaf-ops/$(PROJECT_NAME):$(BRANCH_NAME)-$(BUILD_NUMBER)
+	-$(DOCKER_COMPOSE_TEST_UNIT) down --rmi local
+	-$(DOCKER_COMPOSE_TEST_ACCEPTANCE) down --rmi local
+
+format:
+	$(DOCKER_COMPOSE) run --rm test_unit npm run --silent format
+
+format_fix:
+	$(DOCKER_COMPOSE) run --rm test_unit npm run --silent format:fix
+
+lint:
+	$(DOCKER_COMPOSE) run --rm test_unit npm run --silent lint
+
+test: format lint test_unit test_acceptance
+
+test_unit:
+ifneq (,$(wildcard test/unit))
+	$(DOCKER_COMPOSE_TEST_UNIT) run --rm test_unit
+	$(MAKE) test_unit_clean
+endif
+
+test_clean: test_unit_clean
+test_unit_clean:
+ifneq (,$(wildcard test/unit))
+	$(DOCKER_COMPOSE_TEST_UNIT) down -v -t 0
+endif
+
+test_acceptance: test_acceptance_clean test_acceptance_pre_run test_acceptance_run
+	$(MAKE) test_acceptance_clean
+
+test_acceptance_debug: test_acceptance_clean test_acceptance_pre_run test_acceptance_run_debug
+	$(MAKE) test_acceptance_clean
+
+test_acceptance_run:
+ifneq (,$(wildcard test/acceptance))
+	$(DOCKER_COMPOSE_TEST_ACCEPTANCE) run --rm test_acceptance
+endif
+
+test_acceptance_run_debug:
+ifneq (,$(wildcard test/acceptance))
+	$(DOCKER_COMPOSE_TEST_ACCEPTANCE) run -p 127.0.0.9:19999:19999 --rm test_acceptance npm run test:acceptance -- --inspect=0.0.0.0:19999 --inspect-brk
+endif
+
+test_clean: test_acceptance_clean
+test_acceptance_clean:
+	$(DOCKER_COMPOSE_TEST_ACCEPTANCE) down -v -t 0
+
+test_acceptance_pre_run:
+ifneq (,$(wildcard test/acceptance/js/scripts/pre-run))
+	$(DOCKER_COMPOSE_TEST_ACCEPTANCE) run --rm test_acceptance test/acceptance/js/scripts/pre-run
+endif
+
+build:
+	docker build --pull --tag ci/$(PROJECT_NAME):$(BRANCH_NAME)-$(BUILD_NUMBER) \
+		--tag gcr.io/overleaf-ops/$(PROJECT_NAME):$(BRANCH_NAME)-$(BUILD_NUMBER) \
+		.
+
+tar:
+	$(DOCKER_COMPOSE) up tar
+
+publish:
+
+	docker push $(DOCKER_REPO)/$(PROJECT_NAME):$(BRANCH_NAME)-$(BUILD_NUMBER)
+
+
+.PHONY: clean test test_unit test_acceptance test_clean build publish

services/real-time/app.js

@@ -0,0 +1,288 @@
+const Metrics = require('@overleaf/metrics')
+const Settings = require('@overleaf/settings')
+Metrics.initialize(Settings.appName || 'real-time')
+const async = require('async')
+
+const logger = require('logger-sharelatex')
+logger.initialize('real-time')
+Metrics.event_loop.monitor(logger)
+
+const express = require('express')
+const session = require('express-session')
+const redis = require('@overleaf/redis-wrapper')
+if (Settings.sentry && Settings.sentry.dsn) {
+  logger.initializeErrorReporting(Settings.sentry.dsn)
+}
+
+const sessionRedisClient = redis.createClient(Settings.redis.websessions)
+
+const RedisStore = require('connect-redis')(session)
+const SessionSockets = require('./app/js/SessionSockets')
+const CookieParser = require('cookie-parser')
+
+const DrainManager = require('./app/js/DrainManager')
+const HealthCheckManager = require('./app/js/HealthCheckManager')
+const DeploymentManager = require('./app/js/DeploymentManager')
+
+// NOTE: debug is invoked for every blob that is put on the wire
+const socketIoLogger = {
+  error(...message) {
+    logger.info({ fromSocketIo: true, originalLevel: 'error' }, ...message)
+  },
+  warn(...message) {
+    logger.info({ fromSocketIo: true, originalLevel: 'warn' }, ...message)
+  },
+  info() {},
+  debug() {},
+  log() {},
+}
+
+// monitor status file to take dark deployments out of the load-balancer
+DeploymentManager.initialise()
+
+// Set up socket.io server
+const app = express()
+
+const server = require('http').createServer(app)
+const io = require('socket.io').listen(server, {
+  logger: socketIoLogger,
+})
+
+// Bind to sessions
+const sessionStore = new RedisStore({ client: sessionRedisClient })
+const cookieParser = CookieParser(Settings.security.sessionSecret)
+
+const sessionSockets = new SessionSockets(
+  io,
+  sessionStore,
+  cookieParser,
+  Settings.cookieName
+)
+
+Metrics.injectMetricsRoute(app)
+app.use(Metrics.http.monitor(logger))
+
+io.configure(function () {
+  io.enable('browser client minification')
+  io.enable('browser client etag')
+
+  // Fix for Safari 5 error of "Error during WebSocket handshake: location mismatch"
+  // See http://answers.dotcloud.com/question/578/problem-with-websocket-over-ssl-in-safari-with
+  io.set('match origin protocol', true)
+
+  // gzip uses a Node 0.8.x method of calling the gzip program which
+  // doesn't work with 0.6.x
+  // io.enable('browser client gzip')
+  io.set('transports', [
+    'websocket',
+    'flashsocket',
+    'htmlfile',
+    'xhr-polling',
+    'jsonp-polling',
+  ])
+})
+
+// a 200 response on '/' is required for load balancer health checks
+// these operate separately from kubernetes readiness checks
+app.get('/', function (req, res) {
+  if (Settings.shutDownInProgress || DeploymentManager.deploymentIsClosed()) {
+    res.sendStatus(503) // Service unavailable
+  } else {
+    res.send('real-time is open')
+  }
+})
+
+app.get('/status', function (req, res) {
+  if (Settings.shutDownInProgress) {
+    res.sendStatus(503) // Service unavailable
+  } else {
+    res.send('real-time is alive')
+  }
+})
+
+app.get('/debug/events', function (req, res) {
+  Settings.debugEvents = parseInt(req.query.count, 10) || 20
+  logger.log({ count: Settings.debugEvents }, 'starting debug mode')
+  res.send(`debug mode will log next ${Settings.debugEvents} events`)
+})
+
+const rclient = require('@overleaf/redis-wrapper').createClient(
+  Settings.redis.realtime
+)
+
+function healthCheck(req, res) {
+  rclient.healthCheck(function (error) {
+    if (error) {
+      logger.err({ err: error }, 'failed redis health check')
+      res.sendStatus(500)
+    } else if (HealthCheckManager.isFailing()) {
+      const status = HealthCheckManager.status()
+      logger.err({ pubSubErrors: status }, 'failed pubsub health check')
+      res.sendStatus(500)
+    } else {
+      res.sendStatus(200)
+    }
+  })
+}
+app.get(
+  '/health_check',
+  (req, res, next) => {
+    if (Settings.shutDownComplete) {
+      return res.sendStatus(503)
+    }
+    next()
+  },
+  healthCheck
+)
+
+app.get('/health_check/redis', healthCheck)
+
+const Router = require('./app/js/Router')
+Router.configure(app, io, sessionSockets)
+
+const WebsocketLoadBalancer = require('./app/js/WebsocketLoadBalancer')
+WebsocketLoadBalancer.listenForEditorEvents(io)
+
+const DocumentUpdaterController = require('./app/js/DocumentUpdaterController')
+DocumentUpdaterController.listenForUpdatesFromDocumentUpdater(io)
+
+const { port } = Settings.internal.realTime
+const { host } = Settings.internal.realTime
+
+server.listen(port, host, function (error) {
+  if (error) {
+    throw error
+  }
+  logger.info(`realtime starting up, listening on ${host}:${port}`)
+})
+
+// Stop huge stack traces in logs from all the socket.io parsing steps.
+Error.stackTraceLimit = 10
+
+function shutdownCleanly(signal) {
+  const connectedClients = io.sockets.clients().length
+  if (connectedClients === 0) {
+    logger.warn('no clients connected, exiting')
+    process.exit()
+  } else {
+    logger.warn(
+      { connectedClients },
+      'clients still connected, not shutting down yet'
+    )
+    setTimeout(() => shutdownCleanly(signal), 30 * 1000)
+  }
+}
+
+function drainAndShutdown(signal) {
+  if (Settings.shutDownInProgress) {
+    logger.warn({ signal }, 'shutdown already in progress, ignoring signal')
+  } else {
+    Settings.shutDownInProgress = true
+    const { statusCheckInterval } = Settings
+    if (statusCheckInterval) {
+      logger.warn(
+        { signal },
+        `received interrupt, delay drain by ${statusCheckInterval}ms`
+      )
+    }
+    setTimeout(function () {
+      logger.warn(
+        { signal },
+        `received interrupt, starting drain over ${shutdownDrainTimeWindow} mins`
+      )
+      DrainManager.startDrainTimeWindow(io, shutdownDrainTimeWindow, () => {
+        setTimeout(() => {
+          const staleClients = io.sockets.clients()
+          if (staleClients.length !== 0) {
+            logger.warn(
+              { staleClients: staleClients.map(client => client.id) },
+              'forcefully disconnecting stale clients'
+            )
+            staleClients.forEach(client => {
+              client.disconnect()
+            })
+          }
+          // Mark the node as unhealthy.
+          Settings.shutDownComplete = true
+        }, Settings.gracefulReconnectTimeoutMs)
+      })
+      shutdownCleanly(signal)
+    }, statusCheckInterval)
+  }
+}
+
+Settings.shutDownInProgress = false
+const shutdownDrainTimeWindow = parseInt(Settings.shutdownDrainTimeWindow, 10)
+if (Settings.shutdownDrainTimeWindow) {
+  logger.log({ shutdownDrainTimeWindow }, 'shutdownDrainTimeWindow enabled')
+  for (const signal of [
+    'SIGINT',
+    'SIGHUP',
+    'SIGQUIT',
+    'SIGUSR1',
+    'SIGUSR2',
+    'SIGTERM',
+    'SIGABRT',
+  ]) {
+    process.on(signal, drainAndShutdown)
+  } // signal is passed as argument to event handler
+
+  // global exception handler
+  if (Settings.errors && Settings.errors.catchUncaughtErrors) {
+    process.removeAllListeners('uncaughtException')
+    process.on('uncaughtException', function (error) {
+      if (
+        [
+          'ETIMEDOUT',
+          'EHOSTUNREACH',
+          'EPIPE',
+          'ECONNRESET',
+          'ERR_STREAM_WRITE_AFTER_END',
+        ].includes(error.code)
+      ) {
+        Metrics.inc('disconnected_write', 1, { status: error.code })
+        return logger.warn(
+          { err: error },
+          'attempted to write to disconnected client'
+        )
+      }
+      logger.error({ err: error }, 'uncaught exception')
+      if (Settings.errors && Settings.errors.shutdownOnUncaughtError) {
+        drainAndShutdown('SIGABRT')
+      }
+    })
+  }
+}
+
+if (Settings.continualPubsubTraffic) {
+  logger.warn('continualPubsubTraffic enabled')
+
+  const pubsubClient = redis.createClient(Settings.redis.pubsub)
+  const clusterClient = redis.createClient(Settings.redis.websessions)
+
+  const publishJob = function (channel, callback) {
+    const checker = new HealthCheckManager(channel)
+    logger.debug({ channel }, 'sending pub to keep connection alive')
+    const json = JSON.stringify({
+      health_check: true,
+      key: checker.id,
+      date: new Date().toString(),
+    })
+    Metrics.summary(`redis.publish.${channel}`, json.length)
+    pubsubClient.publish(channel, json, function (err) {
+      if (err) {
+        logger.err({ err, channel }, 'error publishing pubsub traffic to redis')
+      }
+      const blob = JSON.stringify({ keep: 'alive' })
+      Metrics.summary('redis.publish.cluster-continual-traffic', blob.length)
+      clusterClient.publish('cluster-continual-traffic', blob, callback)
+    })
+  }
+
+  const runPubSubTraffic = () =>
+    async.map(['applied-ops', 'editor-events'], publishJob, () =>
+      setTimeout(runPubSubTraffic, 1000 * 20)
+    )
+
+  runPubSubTraffic()
+}

services/real-time/app/js/AuthorizationManager.js

@@ -0,0 +1,67 @@
+/* eslint-disable
+    camelcase,
+*/
+const { NotAuthorizedError } = require('./Errors')
+
+let AuthorizationManager
+module.exports = AuthorizationManager = {
+  assertClientCanViewProject(client, callback) {
+    AuthorizationManager._assertClientHasPrivilegeLevel(
+      client,
+      ['readOnly', 'readAndWrite', 'owner'],
+      callback
+    )
+  },
+
+  assertClientCanEditProject(client, callback) {
+    AuthorizationManager._assertClientHasPrivilegeLevel(
+      client,
+      ['readAndWrite', 'owner'],
+      callback
+    )
+  },
+
+  _assertClientHasPrivilegeLevel(client, allowedLevels, callback) {
+    if (allowedLevels.includes(client.ol_context.privilege_level)) {
+      callback(null)
+    } else {
+      callback(new NotAuthorizedError())
+    }
+  },
+
+  assertClientCanViewProjectAndDoc(client, doc_id, callback) {
+    AuthorizationManager.assertClientCanViewProject(client, function (error) {
+      if (error) {
+        return callback(error)
+      }
+      AuthorizationManager._assertClientCanAccessDoc(client, doc_id, callback)
+    })
+  },
+
+  assertClientCanEditProjectAndDoc(client, doc_id, callback) {
+    AuthorizationManager.assertClientCanEditProject(client, function (error) {
+      if (error) {
+        return callback(error)
+      }
+      AuthorizationManager._assertClientCanAccessDoc(client, doc_id, callback)
+    })
+  },
+
+  _assertClientCanAccessDoc(client, doc_id, callback) {
+    if (client.ol_context[`doc:${doc_id}`] === 'allowed') {
+      callback(null)
+    } else {
+      callback(new NotAuthorizedError())
+    }
+  },
+
+  addAccessToDoc(client, doc_id, callback) {
+    client.ol_context[`doc:${doc_id}`] = 'allowed'
+    callback(null)
+  },
+
+  removeAccessToDoc(client, doc_id, callback) {
+    delete client.ol_context[`doc:${doc_id}`]
+    callback(null)
+  },
+}

services/real-time/app/js/ChannelManager.js

@@ -0,0 +1,101 @@
+const logger = require('logger-sharelatex')
+const metrics = require('@overleaf/metrics')
+const settings = require('@overleaf/settings')
+const OError = require('@overleaf/o-error')
+
+const ClientMap = new Map() // for each redis client, store a Map of subscribed channels (channelname -> subscribe promise)
+
+// Manage redis pubsub subscriptions for individual projects and docs, ensuring
+// that we never subscribe to a channel multiple times. The socket.io side is
+// handled by RoomManager.
+
+module.exports = {
+  getClientMapEntry(rclient) {
+    // return the per-client channel map if it exists, otherwise create and
+    // return an empty map for the client.
+    return (
+      ClientMap.get(rclient) || ClientMap.set(rclient, new Map()).get(rclient)
+    )
+  },
+
+  subscribe(rclient, baseChannel, id) {
+    const clientChannelMap = this.getClientMapEntry(rclient)
+    const channel = `${baseChannel}:${id}`
+    const actualSubscribe = function () {
+      // subscribe is happening in the foreground and it should reject
+      return rclient
+        .subscribe(channel)
+        .finally(function () {
+          if (clientChannelMap.get(channel) === subscribePromise) {
+            clientChannelMap.delete(channel)
+          }
+        })
+        .then(function () {
+          logger.log({ channel }, 'subscribed to channel')
+          metrics.inc(`subscribe.${baseChannel}`)
+        })
+        .catch(function (err) {
+          logger.error({ channel, err }, 'failed to subscribe to channel')
+          metrics.inc(`subscribe.failed.${baseChannel}`)
+          // add context for the stack-trace at the call-site
+          throw new OError('failed to subscribe to channel', {
+            channel,
+          }).withCause(err)
+        })
+    }
+
+    const pendingActions = clientChannelMap.get(channel) || Promise.resolve()
+    const subscribePromise = pendingActions.then(
+      actualSubscribe,
+      actualSubscribe
+    )
+    clientChannelMap.set(channel, subscribePromise)
+    logger.log({ channel }, 'planned to subscribe to channel')
+    return subscribePromise
+  },
+
+  unsubscribe(rclient, baseChannel, id) {
+    const clientChannelMap = this.getClientMapEntry(rclient)
+    const channel = `${baseChannel}:${id}`
+    const actualUnsubscribe = function () {
+      // unsubscribe is happening in the background, it should not reject
+      return rclient
+        .unsubscribe(channel)
+        .finally(function () {
+          if (clientChannelMap.get(channel) === unsubscribePromise) {
+            clientChannelMap.delete(channel)
+          }
+        })
+        .then(function () {
+          logger.log({ channel }, 'unsubscribed from channel')
+          metrics.inc(`unsubscribe.${baseChannel}`)
+        })
+        .catch(function (err) {
+          logger.error({ channel, err }, 'unsubscribed from channel')
+          metrics.inc(`unsubscribe.failed.${baseChannel}`)
+        })
+    }
+
+    const pendingActions = clientChannelMap.get(channel) || Promise.resolve()
+    const unsubscribePromise = pendingActions.then(
+      actualUnsubscribe,
+      actualUnsubscribe
+    )
+    clientChannelMap.set(channel, unsubscribePromise)
+    logger.log({ channel }, 'planned to unsubscribe from channel')
+    return unsubscribePromise
+  },
+
+  publish(rclient, baseChannel, id, data) {
+    let channel
+    metrics.summary(`redis.publish.${baseChannel}`, data.length)
+    if (id === 'all' || !settings.publishOnIndividualChannels) {
+      channel = baseChannel
+    } else {
+      channel = `${baseChannel}:${id}`
+    }
+    // we publish on a different client to the subscribe, so we can't
+    // check for the channel existing here
+    rclient.publish(channel, data)
+  },
+}

services/real-time/app/js/ConnectedUsersManager.js

@@ -0,0 +1,176 @@
+/* eslint-disable
+    camelcase,
+*/
+const async = require('async')
+const Settings = require('@overleaf/settings')
+const logger = require('logger-sharelatex')
+const redis = require('@overleaf/redis-wrapper')
+const OError = require('@overleaf/o-error')
+const rclient = redis.createClient(Settings.redis.realtime)
+const Keys = Settings.redis.realtime.key_schema
+
+const ONE_HOUR_IN_S = 60 * 60
+const ONE_DAY_IN_S = ONE_HOUR_IN_S * 24
+const FOUR_DAYS_IN_S = ONE_DAY_IN_S * 4
+
+const USER_TIMEOUT_IN_S = ONE_HOUR_IN_S / 4
+const REFRESH_TIMEOUT_IN_S = 10 // only show clients which have responded to a refresh request in the last 10 seconds
+
+module.exports = {
+  // Use the same method for when a user connects, and when a user sends a cursor
+  // update. This way we don't care if the connected_user key has expired when
+  // we receive a cursor update.
+  updateUserPosition(project_id, client_id, user, cursorData, callback) {
+    logger.log({ project_id, client_id }, 'marking user as joined or connected')
+
+    const multi = rclient.multi()
+
+    multi.sadd(Keys.clientsInProject({ project_id }), client_id)
+    multi.expire(Keys.clientsInProject({ project_id }), FOUR_DAYS_IN_S)
+
+    multi.hset(
+      Keys.connectedUser({ project_id, client_id }),
+      'last_updated_at',
+      Date.now()
+    )
+    multi.hset(
+      Keys.connectedUser({ project_id, client_id }),
+      'user_id',
+      user._id
+    )
+    multi.hset(
+      Keys.connectedUser({ project_id, client_id }),
+      'first_name',
+      user.first_name || ''
+    )
+    multi.hset(
+      Keys.connectedUser({ project_id, client_id }),
+      'last_name',
+      user.last_name || ''
+    )
+    multi.hset(
+      Keys.connectedUser({ project_id, client_id }),
+      'email',
+      user.email || ''
+    )
+
+    if (cursorData) {
+      multi.hset(
+        Keys.connectedUser({ project_id, client_id }),
+        'cursorData',
+        JSON.stringify(cursorData)
+      )
+    }
+    multi.expire(
+      Keys.connectedUser({ project_id, client_id }),
+      USER_TIMEOUT_IN_S
+    )
+
+    multi.exec(function (err) {
+      if (err) {
+        err = new OError('problem marking user as connected').withCause(err)
+      }
+      callback(err)
+    })
+  },
+
+  refreshClient(project_id, client_id) {
+    logger.log({ project_id, client_id }, 'refreshing connected client')
+    const multi = rclient.multi()
+    multi.hset(
+      Keys.connectedUser({ project_id, client_id }),
+      'last_updated_at',
+      Date.now()
+    )
+    multi.expire(
+      Keys.connectedUser({ project_id, client_id }),
+      USER_TIMEOUT_IN_S
+    )
+    multi.exec(function (err) {
+      if (err) {
+        logger.err(
+          { err, project_id, client_id },
+          'problem refreshing connected client'
+        )
+      }
+    })
+  },
+
+  markUserAsDisconnected(project_id, client_id, callback) {
+    logger.log({ project_id, client_id }, 'marking user as disconnected')
+    const multi = rclient.multi()
+    multi.srem(Keys.clientsInProject({ project_id }), client_id)
+    multi.expire(Keys.clientsInProject({ project_id }), FOUR_DAYS_IN_S)
+    multi.del(Keys.connectedUser({ project_id, client_id }))
+    multi.exec(function (err) {
+      if (err) {
+        err = new OError('problem marking user as disconnected').withCause(err)
+      }
+      callback(err)
+    })
+  },
+
+  _getConnectedUser(project_id, client_id, callback) {
+    rclient.hgetall(
+      Keys.connectedUser({ project_id, client_id }),
+      function (err, result) {
+        if (err) {
+          err = new OError('problem fetching connected user details', {
+            other_client_id: client_id,
+          }).withCause(err)
+          return callback(err)
+        }
+        if (!(result && result.user_id)) {
+          result = {
+            connected: false,
+            client_id,
+          }
+        } else {
+          result.connected = true
+          result.client_id = client_id
+          result.client_age =
+            (Date.now() - parseInt(result.last_updated_at, 10)) / 1000
+          if (result.cursorData) {
+            try {
+              result.cursorData = JSON.parse(result.cursorData)
+            } catch (e) {
+              OError.tag(e, 'error parsing cursorData JSON', {
+                other_client_id: client_id,
+                cursorData: result.cursorData,
+              })
+              return callback(e)
+            }
+          }
+        }
+        callback(err, result)
+      }
+    )
+  },
+
+  getConnectedUsers(project_id, callback) {
+    const self = this
+    rclient.smembers(
+      Keys.clientsInProject({ project_id }),
+      function (err, results) {
+        if (err) {
+          err = new OError('problem getting clients in project').withCause(err)
+          return callback(err)
+        }
+        const jobs = results.map(
+          client_id => cb => self._getConnectedUser(project_id, client_id, cb)
+        )
+        async.series(jobs, function (err, users) {
+          if (err) {
+            OError.tag(err, 'problem getting connected users')
+            return callback(err)
+          }
+          users = users.filter(
+            user =>
+              user && user.connected && user.client_age < REFRESH_TIMEOUT_IN_S
+          )
+          callback(null, users)
+        })
+      }
+    )
+  },
+}

services/real-time/app/js/DeploymentManager.js

@@ -0,0 +1,59 @@
+const logger = require('logger-sharelatex')
+const settings = require('@overleaf/settings')
+const fs = require('fs')
+
+// Monitor a status file (e.g. /etc/real_time_status) periodically and close the
+// service if the file contents don't contain the matching deployment colour.
+
+const FILE_CHECK_INTERVAL = 5000
+const statusFile = settings.deploymentFile
+const deploymentColour = settings.deploymentColour
+
+let serviceCloseTime
+
+function updateDeploymentStatus(fileContent) {
+  const closed = fileContent && !fileContent.includes(deploymentColour)
+  if (closed && !settings.serviceIsClosed) {
+    settings.serviceIsClosed = true
+    serviceCloseTime = Date.now() + 60 * 1000 // delay closing by 1 minute
+    logger.warn({ fileContent }, 'closing service')
+  } else if (!closed && settings.serviceIsClosed) {
+    settings.serviceIsClosed = false
+    logger.warn({ fileContent }, 'opening service')
+  }
+}
+
+function pollStatusFile() {
+  fs.readFile(statusFile, { encoding: 'utf8' }, (err, fileContent) => {
+    if (err) {
+      logger.error(
+        { file: statusFile, fsErr: err },
+        'error reading service status file'
+      )
+      return
+    }
+    updateDeploymentStatus(fileContent)
+  })
+}
+
+function checkStatusFileSync() {
+  // crash on start up if file does not exist
+  const content = fs.readFileSync(statusFile, { encoding: 'utf8' })
+  updateDeploymentStatus(content)
+}
+
+module.exports = {
+  initialise() {
+    if (statusFile && deploymentColour) {
+      logger.log(
+        { statusFile, deploymentColour, interval: FILE_CHECK_INTERVAL },
+        'monitoring deployment status file'
+      )
+      checkStatusFileSync() // perform an initial synchronous check at start up
+      setInterval(pollStatusFile, FILE_CHECK_INTERVAL) // continue checking periodically
+    }
+  },
+  deploymentIsClosed() {
+    return settings.serviceIsClosed && Date.now() > serviceCloseTime
+  },
+}

services/real-time/app/js/DocumentUpdaterController.js

@@ -0,0 +1,176 @@
+/* eslint-disable
+    camelcase,
+*/
+const logger = require('logger-sharelatex')
+const settings = require('@overleaf/settings')
+const RedisClientManager = require('./RedisClientManager')
+const SafeJsonParse = require('./SafeJsonParse')
+const EventLogger = require('./EventLogger')
+const HealthCheckManager = require('./HealthCheckManager')
+const RoomManager = require('./RoomManager')
+const ChannelManager = require('./ChannelManager')
+const metrics = require('@overleaf/metrics')
+
+let DocumentUpdaterController
+module.exports = DocumentUpdaterController = {
+  // DocumentUpdaterController is responsible for updates that come via Redis
+  // Pub/Sub from the document updater.
+  rclientList: RedisClientManager.createClientList(settings.redis.pubsub),
+
+  listenForUpdatesFromDocumentUpdater(io) {
+    logger.log(
+      { rclients: this.rclientList.length },
+      'listening for applied-ops events'
+    )
+    for (const rclient of this.rclientList) {
+      rclient.subscribe('applied-ops')
+      rclient.on('message', function (channel, message) {
+        metrics.inc('rclient', 0.001) // global event rate metric
+        if (settings.debugEvents > 0) {
+          EventLogger.debugEvent(channel, message)
+        }
+        DocumentUpdaterController._processMessageFromDocumentUpdater(
+          io,
+          channel,
+          message
+        )
+      })
+    }
+    // create metrics for each redis instance only when we have multiple redis clients
+    if (this.rclientList.length > 1) {
+      this.rclientList.forEach((rclient, i) => {
+        // per client event rate metric
+        const metricName = `rclient-${i}`
+        rclient.on('message', () => metrics.inc(metricName, 0.001))
+      })
+    }
+    this.handleRoomUpdates(this.rclientList)
+  },
+
+  handleRoomUpdates(rclientSubList) {
+    const roomEvents = RoomManager.eventSource()
+    roomEvents.on('doc-active', function (doc_id) {
+      const subscribePromises = rclientSubList.map(rclient =>
+        ChannelManager.subscribe(rclient, 'applied-ops', doc_id)
+      )
+      RoomManager.emitOnCompletion(
+        subscribePromises,
+        `doc-subscribed-${doc_id}`
+      )
+    })
+    roomEvents.on('doc-empty', doc_id =>
+      rclientSubList.map(rclient =>
+        ChannelManager.unsubscribe(rclient, 'applied-ops', doc_id)
+      )
+    )
+  },
+
+  _processMessageFromDocumentUpdater(io, channel, message) {
+    SafeJsonParse.parse(message, function (error, message) {
+      if (error) {
+        logger.error({ err: error, channel }, 'error parsing JSON')
+        return
+      }
+      if (message.op) {
+        if (message._id && settings.checkEventOrder) {
+          const status = EventLogger.checkEventOrder(
+            'applied-ops',
+            message._id,
+            message
+          )
+          if (status === 'duplicate') {
+            return // skip duplicate events
+          }
+        }
+        DocumentUpdaterController._applyUpdateFromDocumentUpdater(
+          io,
+          message.doc_id,
+          message.op
+        )
+      } else if (message.error) {
+        DocumentUpdaterController._processErrorFromDocumentUpdater(
+          io,
+          message.doc_id,
+          message.error,
+          message
+        )
+      } else if (message.health_check) {
+        logger.debug(
+          { message },
+          'got health check message in applied ops channel'
+        )
+        HealthCheckManager.check(channel, message.key)
+      }
+    })
+  },
+
+  _applyUpdateFromDocumentUpdater(io, doc_id, update) {
+    let client
+    const clientList = io.sockets.clients(doc_id)
+    // avoid unnecessary work if no clients are connected
+    if (clientList.length === 0) {
+      return
+    }
+    // send updates to clients
+    logger.log(
+      {
+        doc_id,
+        version: update.v,
+        source: update.meta && update.meta.source,
+        socketIoClients: clientList.map(client => client.id),
+      },
+      'distributing updates to clients'
+    )
+    const seen = {}
+    // send messages only to unique clients (due to duplicate entries in io.sockets.clients)
+    for (client of clientList) {
+      if (!seen[client.id]) {
+        seen[client.id] = true
+        if (client.publicId === update.meta.source) {
+          logger.log(
+            {
+              doc_id,
+              version: update.v,
+              source: update.meta.source,
+            },
+            'distributing update to sender'
+          )
+          client.emit('otUpdateApplied', { v: update.v, doc: update.doc })
+        } else if (!update.dup) {
+          // Duplicate ops should just be sent back to sending client for acknowledgement
+          logger.log(
+            {
+              doc_id,
+              version: update.v,
+              source: update.meta.source,
+              client_id: client.id,
+            },
+            'distributing update to collaborator'
+          )
+          client.emit('otUpdateApplied', update)
+        }
+      }
+    }
+    if (Object.keys(seen).length < clientList.length) {
+      metrics.inc('socket-io.duplicate-clients', 0.1)
+      logger.log(
+        {
+          doc_id,
+          socketIoClients: clientList.map(client => client.id),
+        },
+        'discarded duplicate clients'
+      )
+    }
+  },
+
+  _processErrorFromDocumentUpdater(io, doc_id, error, message) {
+    for (const client of io.sockets.clients(doc_id)) {
+      logger.warn(
+        { err: error, doc_id, client_id: client.id },
+        'error from document updater, disconnecting client'
+      )
+      client.emit('otUpdateError', error, message)
+      client.disconnect()
+    }
+  },
+}

services/real-time/app/js/DocumentUpdaterManager.js

@@ -0,0 +1,150 @@
+/* eslint-disable
+    camelcase,
+*/
+const request = require('request')
+const _ = require('underscore')
+const OError = require('@overleaf/o-error')
+const logger = require('logger-sharelatex')
+const settings = require('@overleaf/settings')
+const metrics = require('@overleaf/metrics')
+const {
+  ClientRequestedMissingOpsError,
+  DocumentUpdaterRequestFailedError,
+  NullBytesInOpError,
+  UpdateTooLargeError,
+} = require('./Errors')
+
+const rclient = require('@overleaf/redis-wrapper').createClient(
+  settings.redis.documentupdater
+)
+const Keys = settings.redis.documentupdater.key_schema
+
+const DocumentUpdaterManager = {
+  getDocument(project_id, doc_id, fromVersion, callback) {
+    const timer = new metrics.Timer('get-document')
+    const url = `${settings.apis.documentupdater.url}/project/${project_id}/doc/${doc_id}?fromVersion=${fromVersion}`
+    logger.log(
+      { project_id, doc_id, fromVersion },
+      'getting doc from document updater'
+    )
+    request.get(url, function (err, res, body) {
+      timer.done()
+      if (err) {
+        OError.tag(err, 'error getting doc from doc updater')
+        return callback(err)
+      }
+      if (res.statusCode >= 200 && res.statusCode < 300) {
+        logger.log(
+          { project_id, doc_id },
+          'got doc from document document updater'
+        )
+        try {
+          body = JSON.parse(body)
+        } catch (error) {
+          OError.tag(error, 'error parsing doc updater response')
+          return callback(error)
+        }
+        body = body || {}
+        callback(null, body.lines, body.version, body.ranges, body.ops)
+      } else if ([404, 422].includes(res.statusCode)) {
+        callback(new ClientRequestedMissingOpsError(res.statusCode))
+      } else {
+        callback(
+          new DocumentUpdaterRequestFailedError('getDocument', res.statusCode)
+        )
+      }
+    })
+  },
+
+  checkDocument(project_id, doc_id, callback) {
+    // in this call fromVersion = -1 means get document without docOps
+    DocumentUpdaterManager.getDocument(project_id, doc_id, -1, callback)
+  },
+
+  flushProjectToMongoAndDelete(project_id, callback) {
+    // this method is called when the last connected user leaves the project
+    logger.log({ project_id }, 'deleting project from document updater')
+    const timer = new metrics.Timer('delete.mongo.project')
+    // flush the project in the background when all users have left
+    const url =
+      `${settings.apis.documentupdater.url}/project/${project_id}?background=true` +
+      (settings.shutDownInProgress ? '&shutdown=true' : '')
+    request.del(url, function (err, res) {
+      timer.done()
+      if (err) {
+        OError.tag(err, 'error deleting project from document updater')
+        callback(err)
+      } else if (res.statusCode >= 200 && res.statusCode < 300) {
+        logger.log({ project_id }, 'deleted project from document updater')
+        callback(null)
+      } else {
+        callback(
+          new DocumentUpdaterRequestFailedError(
+            'flushProjectToMongoAndDelete',
+            res.statusCode
+          )
+        )
+      }
+    })
+  },
+
+  _getPendingUpdateListKey() {
+    const shard = _.random(0, settings.pendingUpdateListShardCount - 1)
+    if (shard === 0) {
+      return 'pending-updates-list'
+    } else {
+      return `pending-updates-list-${shard}`
+    }
+  },
+
+  queueChange(project_id, doc_id, change, callback) {
+    const allowedKeys = [
+      'doc',
+      'op',
+      'v',
+      'dupIfSource',
+      'meta',
+      'lastV',
+      'hash',
+    ]
+    change = _.pick(change, allowedKeys)
+    const jsonChange = JSON.stringify(change)
+    if (jsonChange.indexOf('\u0000') !== -1) {
+      // memory corruption check
+      return callback(new NullBytesInOpError(jsonChange))
+    }
+
+    const updateSize = jsonChange.length
+    if (updateSize > settings.maxUpdateSize) {
+      return callback(new UpdateTooLargeError(updateSize))
+    }
+
+    // record metric for each update added to queue
+    metrics.summary('redis.pendingUpdates', updateSize, { status: 'push' })
+
+    const doc_key = `${project_id}:${doc_id}`
+    // Push onto pendingUpdates for doc_id first, because once the doc updater
+    // gets an entry on pending-updates-list, it starts processing.
+    rclient.rpush(
+      Keys.pendingUpdates({ doc_id }),
+      jsonChange,
+      function (error) {
+        if (error) {
+          error = new OError('error pushing update into redis').withCause(error)
+          return callback(error)
+        }
+        const queueKey = DocumentUpdaterManager._getPendingUpdateListKey()
+        rclient.rpush(queueKey, doc_key, function (error) {
+          if (error) {
+            error = new OError('error pushing doc_id into redis')
+              .withInfo({ queueKey })
+              .withCause(error)
+          }
+          callback(error)
+        })
+      }
+    )
+  },
+}
+
+module.exports = DocumentUpdaterManager

services/real-time/app/js/DrainManager.js

@@ -0,0 +1,59 @@
+const logger = require('logger-sharelatex')
+
+module.exports = {
+  startDrainTimeWindow(io, minsToDrain, callback) {
+    const drainPerMin = io.sockets.clients().length / minsToDrain
+    // enforce minimum drain rate
+    this.startDrain(io, Math.max(drainPerMin / 60, 4), callback)
+  },
+
+  startDrain(io, rate, callback) {
+    // Clear out any old interval
+    clearInterval(this.interval)
+    logger.log({ rate }, 'starting drain')
+    if (rate === 0) {
+      return
+    }
+    let pollingInterval
+    if (rate < 1) {
+      // allow lower drain rates
+      // e.g. rate=0.1 will drain one client every 10 seconds
+      pollingInterval = 1000 / rate
+      rate = 1
+    } else {
+      pollingInterval = 1000
+    }
+    this.interval = setInterval(() => {
+      const requestedAllClientsToReconnect = this.reconnectNClients(io, rate)
+      if (requestedAllClientsToReconnect && callback) {
+        callback()
+        callback = undefined
+      }
+    }, pollingInterval)
+  },
+
+  RECONNECTED_CLIENTS: {},
+  reconnectNClients(io, N) {
+    let drainedCount = 0
+    for (const client of io.sockets.clients()) {
+      if (!this.RECONNECTED_CLIENTS[client.id]) {
+        this.RECONNECTED_CLIENTS[client.id] = true
+        logger.log(
+          { client_id: client.id },
+          'Asking client to reconnect gracefully'
+        )
+        client.emit('reconnectGracefully')
+        drainedCount++
+      }
+      const haveDrainedNClients = drainedCount === N
+      if (haveDrainedNClients) {
+        break
+      }
+    }
+    if (drainedCount < N) {
+      logger.log('All clients have been told to reconnectGracefully')
+      return true
+    }
+    return false
+  },
+}

services/real-time/app/js/Errors.js

@@ -0,0 +1,103 @@
+const OError = require('@overleaf/o-error')
+
+class ClientRequestedMissingOpsError extends OError {
+  constructor(statusCode) {
+    super('doc updater could not load requested ops', {
+      statusCode,
+    })
+  }
+}
+
+class CodedError extends OError {
+  constructor(message, code) {
+    super(message, { code })
+  }
+}
+
+class CorruptedJoinProjectResponseError extends OError {
+  constructor() {
+    super('no data returned from joinProject request')
+  }
+}
+
+class DataTooLargeToParseError extends OError {
+  constructor(data) {
+    super('data too large to parse', {
+      head: data.slice(0, 1024),
+      length: data.length,
+    })
+  }
+}
+
+class DocumentUpdaterRequestFailedError extends OError {
+  constructor(action, statusCode) {
+    super('doc updater returned a non-success status code', {
+      action,
+      statusCode,
+    })
+  }
+}
+
+class JoinLeaveEpochMismatchError extends OError {
+  constructor() {
+    super('joinLeaveEpoch mismatch')
+  }
+}
+
+class MissingSessionError extends OError {
+  constructor() {
+    super('could not look up session by key')
+  }
+}
+
+class NotAuthorizedError extends OError {
+  constructor() {
+    super('not authorized')
+  }
+}
+
+class NotJoinedError extends OError {
+  constructor() {
+    super('no project_id found on client')
+  }
+}
+
+class NullBytesInOpError extends OError {
+  constructor(jsonChange) {
+    super('null bytes found in op', { jsonChange })
+  }
+}
+
+class UnexpectedArgumentsError extends OError {
+  constructor() {
+    super('unexpected arguments')
+  }
+}
+
+class UpdateTooLargeError extends OError {
+  constructor(updateSize) {
+    super('update is too large', { updateSize })
+  }
+}
+
+class WebApiRequestFailedError extends OError {
+  constructor(statusCode) {
+    super('non-success status code from web', { statusCode })
+  }
+}
+
+module.exports = {
+  CodedError,
+  CorruptedJoinProjectResponseError,
+  ClientRequestedMissingOpsError,
+  DataTooLargeToParseError,
+  DocumentUpdaterRequestFailedError,
+  JoinLeaveEpochMismatchError,
+  MissingSessionError,
+  NotAuthorizedError,
+  NotJoinedError,
+  NullBytesInOpError,
+  UnexpectedArgumentsError,
+  UpdateTooLargeError,
+  WebApiRequestFailedError,
+}

services/real-time/app/js/EventLogger.js

@@ -0,0 +1,84 @@
+/* eslint-disable
+    camelcase,
+*/
+let EventLogger
+const logger = require('logger-sharelatex')
+const metrics = require('@overleaf/metrics')
+const settings = require('@overleaf/settings')
+
+// keep track of message counters to detect duplicate and out of order events
+// messsage ids have the format "UNIQUEHOSTKEY-COUNTER"
+
+const EVENT_LOG_COUNTER = {}
+const EVENT_LOG_TIMESTAMP = {}
+let EVENT_LAST_CLEAN_TIMESTAMP = 0
+
+// counter for debug logs
+let COUNTER = 0
+
+module.exports = EventLogger = {
+  MAX_STALE_TIME_IN_MS: 3600 * 1000,
+
+  debugEvent(channel, message) {
+    if (settings.debugEvents > 0) {
+      logger.log({ channel, message, counter: COUNTER++ }, 'logging event')
+      settings.debugEvents--
+    }
+  },
+
+  checkEventOrder(channel, message_id) {
+    if (typeof message_id !== 'string') {
+      return
+    }
+    let result
+    if (!(result = message_id.match(/^(.*)-(\d+)$/))) {
+      return
+    }
+    const key = result[1]
+    const count = parseInt(result[2], 0)
+    if (!(count >= 0)) {
+      // ignore checks if counter is not present
+      return
+    }
+    // store the last count in a hash for each host
+    const previous = EventLogger._storeEventCount(key, count)
+    if (!previous || count === previous + 1) {
+      metrics.inc(`event.${channel}.valid`)
+      return // order is ok
+    }
+    if (count === previous) {
+      metrics.inc(`event.${channel}.duplicate`)
+      logger.warn({ channel, message_id }, 'duplicate event')
+      return 'duplicate'
+    } else {
+      metrics.inc(`event.${channel}.out-of-order`)
+      logger.warn(
+        { channel, message_id, key, previous, count },
+        'out of order event'
+      )
+      return 'out-of-order'
+    }
+  },
+
+  _storeEventCount(key, count) {
+    const previous = EVENT_LOG_COUNTER[key]
+    const now = Date.now()
+    EVENT_LOG_COUNTER[key] = count
+    EVENT_LOG_TIMESTAMP[key] = now
+    // periodically remove old counts
+    if (now - EVENT_LAST_CLEAN_TIMESTAMP > EventLogger.MAX_STALE_TIME_IN_MS) {
+      EventLogger._cleanEventStream(now)
+      EVENT_LAST_CLEAN_TIMESTAMP = now
+    }
+    return previous
+  },
+
+  _cleanEventStream(now) {
+    Object.entries(EVENT_LOG_TIMESTAMP).forEach(([key, timestamp]) => {
+      if (now - timestamp > EventLogger.MAX_STALE_TIME_IN_MS) {
+        delete EVENT_LOG_COUNTER[key]
+        delete EVENT_LOG_TIMESTAMP[key]
+      }
+    })
+  },
+}

services/real-time/app/js/HealthCheckManager.js

@@ -0,0 +1,77 @@
+const metrics = require('@overleaf/metrics')
+const logger = require('logger-sharelatex')
+
+const os = require('os')
+const HOST = os.hostname()
+const PID = process.pid
+let COUNT = 0
+
+const CHANNEL_MANAGER = {} // hash of event checkers by channel name
+const CHANNEL_ERROR = {} // error status by channel name
+
+module.exports = class HealthCheckManager {
+  // create an instance of this class which checks that an event with a unique
+  // id is received only once within a timeout
+  constructor(channel, timeout) {
+    // unique event string
+    this.channel = channel
+    this.id = `host=${HOST}:pid=${PID}:count=${COUNT++}`
+    // count of number of times the event is received
+    this.count = 0
+    // after a timeout check the status of the count
+    this.handler = setTimeout(() => {
+      this.setStatus()
+    }, timeout || 1000)
+    // use a timer to record the latency of the channel
+    this.timer = new metrics.Timer(`event.${this.channel}.latency`)
+    // keep a record of these objects to dispatch on
+    CHANNEL_MANAGER[this.channel] = this
+  }
+
+  processEvent(id) {
+    // if this is our event record it
+    if (id === this.id) {
+      this.count++
+      if (this.timer) {
+        this.timer.done()
+      }
+      this.timer = undefined // only time the latency of the first event
+    }
+  }
+
+  setStatus() {
+    // if we saw the event anything other than a single time that is an error
+    const isFailing = this.count !== 1
+    if (isFailing) {
+      logger.err(
+        { channel: this.channel, count: this.count, id: this.id },
+        'redis channel health check error'
+      )
+    }
+    CHANNEL_ERROR[this.channel] = isFailing
+  }
+
+  // class methods
+  static check(channel, id) {
+    // dispatch event to manager for channel
+    if (CHANNEL_MANAGER[channel]) {
+      CHANNEL_MANAGER[channel].processEvent(id)
+    }
+  }
+
+  static status() {
+    // return status of all channels for logging
+    return CHANNEL_ERROR
+  }
+
+  static isFailing() {
+    // check if any channel status is bad
+    for (const channel in CHANNEL_ERROR) {
+      const error = CHANNEL_ERROR[channel]
+      if (error === true) {
+        return true
+      }
+    }
+    return false
+  }
+}

services/real-time/app/js/HttpApiController.js

@@ -0,0 +1,52 @@
+/* eslint-disable
+    camelcase,
+*/
+const WebsocketLoadBalancer = require('./WebsocketLoadBalancer')
+const DrainManager = require('./DrainManager')
+const logger = require('logger-sharelatex')
+
+module.exports = {
+  sendMessage(req, res) {
+    logger.log({ message: req.params.message }, 'sending message')
+    if (Array.isArray(req.body)) {
+      for (const payload of req.body) {
+        WebsocketLoadBalancer.emitToRoom(
+          req.params.project_id,
+          req.params.message,
+          payload
+        )
+      }
+    } else {
+      WebsocketLoadBalancer.emitToRoom(
+        req.params.project_id,
+        req.params.message,
+        req.body
+      )
+    }
+    res.sendStatus(204)
+  },
+
+  startDrain(req, res) {
+    const io = req.app.get('io')
+    let rate = req.query.rate || '4'
+    rate = parseFloat(rate) || 0
+    logger.log({ rate }, 'setting client drain rate')
+    DrainManager.startDrain(io, rate)
+    res.sendStatus(204)
+  },
+
+  disconnectClient(req, res, next) {
+    const io = req.app.get('io')
+    const { client_id } = req.params
+    const client = io.sockets.sockets[client_id]
+
+    if (!client) {
+      logger.info({ client_id }, 'api: client already disconnected')
+      res.sendStatus(404)
+      return
+    }
+    logger.warn({ client_id }, 'api: requesting client disconnect')
+    client.on('disconnect', () => res.sendStatus(204))
+    client.disconnect()
+  },
+}

services/real-time/app/js/HttpController.js

@@ -0,0 +1,57 @@
+/* eslint-disable
+    camelcase,
+*/
+
+let HttpController
+module.exports = HttpController = {
+  // The code in this controller is hard to unit test because of a lot of
+  // dependencies on internal socket.io methods. It is not critical to the running
+  // of ShareLaTeX, and is only used for getting stats about connected clients,
+  // and for checking internal state in acceptance tests. The acceptances tests
+  // should provide appropriate coverage.
+  _getConnectedClientView(ioClient) {
+    const client_id = ioClient.id
+    const {
+      project_id,
+      user_id,
+      first_name,
+      last_name,
+      email,
+      connected_time,
+    } = ioClient.ol_context
+    const client = {
+      client_id,
+      project_id,
+      user_id,
+      first_name,
+      last_name,
+      email,
+      connected_time,
+    }
+    client.rooms = Object.keys(ioClient.manager.roomClients[client_id] || {})
+      // drop the namespace
+      .filter(room => room !== '')
+      // room names are composed as '<NAMESPACE>/<ROOM>' and the default
+      //  namespace is empty (see comments in RoomManager), just drop the '/'
+      .map(fullRoomPath => fullRoomPath.slice(1))
+    return client
+  },
+
+  getConnectedClients(req, res) {
+    const io = req.app.get('io')
+    const ioClients = io.sockets.clients()
+
+    res.json(ioClients.map(HttpController._getConnectedClientView))
+  },
+
+  getConnectedClient(req, res) {
+    const { client_id } = req.params
+    const io = req.app.get('io')
+    const ioClient = io.sockets.sockets[client_id]
+    if (!ioClient) {
+      res.sendStatus(404)
+      return
+    }
+    res.json(HttpController._getConnectedClientView(ioClient))
+  },
+}

services/real-time/app/js/RedisClientManager.js

@@ -0,0 +1,19 @@
+const redis = require('@overleaf/redis-wrapper')
+const logger = require('logger-sharelatex')
+
+module.exports = {
+  createClientList(...configs) {
+    // create a dynamic list of redis clients, excluding any configurations which are not defined
+    return configs.filter(Boolean).map(x => {
+      const redisType = x.cluster
+        ? 'cluster'
+        : x.sentinels
+        ? 'sentinel'
+        : x.host
+        ? 'single'
+        : 'unknown'
+      logger.log({ redis: redisType }, 'creating redis client')
+      return redis.createClient(x)
+    })
+  },
+}

services/real-time/app/js/RoomManager.js

@@ -0,0 +1,164 @@
+/* eslint-disable
+    camelcase,
+*/
+const logger = require('logger-sharelatex')
+const metrics = require('@overleaf/metrics')
+const { EventEmitter } = require('events')
+const OError = require('@overleaf/o-error')
+
+const IdMap = new Map() // keep track of whether ids are from projects or docs
+const RoomEvents = new EventEmitter() // emits {project,doc}-active and {project,doc}-empty events
+
+// Manage socket.io rooms for individual projects and docs
+//
+// The first time someone joins a project or doc we emit a 'project-active' or
+// 'doc-active' event.
+//
+// When the last person leaves a project or doc, we emit 'project-empty' or
+// 'doc-empty' event.
+//
+// The pubsub side is handled by ChannelManager
+
+module.exports = {
+  joinProject(client, project_id, callback) {
+    this.joinEntity(client, 'project', project_id, callback)
+  },
+
+  joinDoc(client, doc_id, callback) {
+    this.joinEntity(client, 'doc', doc_id, callback)
+  },
+
+  leaveDoc(client, doc_id) {
+    this.leaveEntity(client, 'doc', doc_id)
+  },
+
+  leaveProjectAndDocs(client) {
+    // what rooms is this client in? we need to leave them all. socket.io
+    // will cause us to leave the rooms, so we only need to manage our
+    // channel subscriptions... but it will be safer if we leave them
+    // explicitly, and then socket.io will just regard this as a client that
+    // has not joined any rooms and do a final disconnection.
+    const roomsToLeave = this._roomsClientIsIn(client)
+    logger.log({ client: client.id, roomsToLeave }, 'client leaving project')
+    for (const id of roomsToLeave) {
+      const entity = IdMap.get(id)
+      this.leaveEntity(client, entity, id)
+    }
+  },
+
+  emitOnCompletion(promiseList, eventName) {
+    Promise.all(promiseList)
+      .then(() => RoomEvents.emit(eventName))
+      .catch(err => RoomEvents.emit(eventName, err))
+  },
+
+  eventSource() {
+    return RoomEvents
+  },
+
+  joinEntity(client, entity, id, callback) {
+    const beforeCount = this._clientsInRoom(client, id)
+    // client joins room immediately but joinDoc request does not complete
+    // until room is subscribed
+    client.join(id)
+    // is this a new room? if so, subscribe
+    if (beforeCount === 0) {
+      logger.log({ entity, id }, 'room is now active')
+      RoomEvents.once(`${entity}-subscribed-${id}`, function (err) {
+        // only allow the client to join when all the relevant channels have subscribed
+        if (err) {
+          OError.tag(err, 'error joining', { entity, id })
+          return callback(err)
+        }
+        logger.log(
+          { client: client.id, entity, id, beforeCount },
+          'client joined new room and subscribed to channel'
+        )
+        callback(err)
+      })
+      RoomEvents.emit(`${entity}-active`, id)
+      IdMap.set(id, entity)
+      // keep track of the number of listeners
+      metrics.gauge('room-listeners', RoomEvents.eventNames().length)
+    } else {
+      logger.log(
+        { client: client.id, entity, id, beforeCount },
+        'client joined existing room'
+      )
+      callback()
+    }
+  },
+
+  leaveEntity(client, entity, id) {
+    // Ignore any requests to leave when the client is not actually in the
+    // room. This can happen if the client sends spurious leaveDoc requests
+    // for old docs after a reconnection.
+    // This can now happen all the time, as we skip the join for clients that
+    //  disconnect before joinProject/joinDoc completed.
+    if (!this._clientAlreadyInRoom(client, id)) {
+      logger.log(
+        { client: client.id, entity, id },
+        'ignoring request from client to leave room it is not in'
+      )
+      return
+    }
+    client.leave(id)
+    const afterCount = this._clientsInRoom(client, id)
+    logger.log(
+      { client: client.id, entity, id, afterCount },
+      'client left room'
+    )
+    // is the room now empty? if so, unsubscribe
+    if (!entity) {
+      logger.error({ entity: id }, 'unknown entity when leaving with id')
+      return
+    }
+    if (afterCount === 0) {
+      logger.log({ entity, id }, 'room is now empty')
+      RoomEvents.emit(`${entity}-empty`, id)
+      IdMap.delete(id)
+      metrics.gauge('room-listeners', RoomEvents.eventNames().length)
+    }
+  },
+
+  // internal functions below, these access socket.io rooms data directly and
+  // will need updating for socket.io v2
+
+  // The below code makes some assumptions that are always true for v0
+  // - we are using the base namespace '', so room names are '/<ENTITY>'
+  //   https://github.com/socketio/socket.io/blob/e4d61b1be65ac3313a85da111a46777aa8d4aae3/lib/manager.js#L62
+  //   https://github.com/socketio/socket.io/blob/e4d61b1be65ac3313a85da111a46777aa8d4aae3/lib/manager.js#L1018
+  // - client.namespace is a Namespace
+  //   https://github.com/socketio/socket.io/blob/e4d61b1be65ac3313a85da111a46777aa8d4aae3/lib/namespace.js#L204
+  //   https://github.com/socketio/socket.io/blob/e4d61b1be65ac3313a85da111a46777aa8d4aae3/lib/socket.js#L40
+  // - client.manager is a Manager
+  //   https://github.com/socketio/socket.io/blob/e4d61b1be65ac3313a85da111a46777aa8d4aae3/lib/namespace.js#L204
+  //   https://github.com/socketio/socket.io/blob/e4d61b1be65ac3313a85da111a46777aa8d4aae3/lib/socket.js#L41
+  // - a Manager has
+  //   - `.rooms={'NAMESPACE/ENTITY': []}` and
+  //   - `.roomClients={'CLIENT_ID': {'...': true}}`
+  //   https://github.com/socketio/socket.io/blob/e4d61b1be65ac3313a85da111a46777aa8d4aae3/lib/manager.js#L287-L288
+  //   https://github.com/socketio/socket.io/blob/e4d61b1be65ac3313a85da111a46777aa8d4aae3/lib/manager.js#L444-L455
+
+  _clientsInRoom(client, room) {
+    const clients = client.manager.rooms['/' + room] || []
+    return clients.length
+  },
+
+  _roomsClientIsIn(client) {
+    const rooms = client.manager.roomClients[client.id] || {}
+    return (
+      Object.keys(rooms)
+        // drop the namespace
+        .filter(room => room !== '')
+        // room names are composed as '<NAMESPACE>/<ROOM>' and the default
+        //  namespace is empty (see comments above), just drop the '/'
+        .map(fullRoomPath => fullRoomPath.slice(1))
+    )
+  },
+
+  _clientAlreadyInRoom(client, room) {
+    const rooms = client.manager.roomClients[client.id] || {}
+    return !!rooms['/' + room]
+  },
+}

services/real-time/app/js/Router.js

@@ -0,0 +1,374 @@
+/* eslint-disable
+    camelcase,
+*/
+const metrics = require('@overleaf/metrics')
+const logger = require('logger-sharelatex')
+const settings = require('@overleaf/settings')
+const WebsocketController = require('./WebsocketController')
+const HttpController = require('./HttpController')
+const HttpApiController = require('./HttpApiController')
+const bodyParser = require('body-parser')
+const base64id = require('base64id')
+const { UnexpectedArgumentsError } = require('./Errors')
+
+const basicAuth = require('basic-auth-connect')
+const httpAuth = basicAuth(function (user, pass) {
+  const isValid =
+    user === settings.internal.realTime.user &&
+    pass === settings.internal.realTime.pass
+  if (!isValid) {
+    logger.err({ user, pass }, 'invalid login details')
+  }
+  return isValid
+})
+
+const HOSTNAME = require('os').hostname()
+
+let Router
+module.exports = Router = {
+  _handleError(callback, error, client, method, attrs) {
+    attrs = attrs || {}
+    for (const key of ['project_id', 'user_id']) {
+      attrs[key] = attrs[key] || client.ol_context[key]
+    }
+    attrs.client_id = client.id
+    attrs.err = error
+    attrs.method = method
+    if (error.name === 'CodedError') {
+      logger.warn(attrs, error.message)
+      const serializedError = { message: error.message, code: error.info.code }
+      callback(serializedError)
+    } else if (error.message === 'unexpected arguments') {
+      // the payload might be very large, put it on level info
+      logger.log(attrs, 'unexpected arguments')
+      metrics.inc('unexpected-arguments', 1, { status: method })
+      const serializedError = { message: error.message }
+      callback(serializedError)
+    } else if (error.message === 'no project_id found on client') {
+      logger.debug(attrs, error.message)
+      const serializedError = { message: error.message }
+      callback(serializedError)
+    } else if (
+      [
+        'not authorized',
+        'joinLeaveEpoch mismatch',
+        'doc updater could not load requested ops',
+      ].includes(error.message)
+    ) {
+      logger.warn(attrs, error.message)
+      const serializedError = { message: error.message }
+      callback(serializedError)
+    } else {
+      logger.error(attrs, `server side error in ${method}`)
+      // Don't return raw error to prevent leaking server side info
+      const serializedError = {
+        message: 'Something went wrong in real-time service',
+      }
+      callback(serializedError)
+    }
+  },
+
+  _handleInvalidArguments(client, method, args) {
+    const error = new UnexpectedArgumentsError()
+    let callback = args[args.length - 1]
+    if (typeof callback !== 'function') {
+      callback = function () {}
+    }
+    const attrs = { arguments: args }
+    Router._handleError(callback, error, client, method, attrs)
+  },
+
+  configure(app, io, session) {
+    app.set('io', io)
+    app.get('/clients', HttpController.getConnectedClients)
+    app.get('/clients/:client_id', HttpController.getConnectedClient)
+
+    app.post(
+      '/project/:project_id/message/:message',
+      httpAuth,
+      bodyParser.json({ limit: '5mb' }),
+      HttpApiController.sendMessage
+    )
+
+    app.post('/drain', httpAuth, HttpApiController.startDrain)
+    app.post(
+      '/client/:client_id/disconnect',
+      httpAuth,
+      HttpApiController.disconnectClient
+    )
+
+    session.on('connection', function (error, client, session) {
+      // init client context, we may access it in Router._handleError before
+      //  setting any values
+      client.ol_context = {}
+      // bail out from joinDoc when a parallel joinDoc or leaveDoc is running
+      client.joinLeaveEpoch = 0
+
+      if (client) {
+        client.on('error', function (err) {
+          logger.err({ clientErr: err }, 'socket.io client error')
+          if (client.connected) {
+            client.emit('reconnectGracefully')
+            client.disconnect()
+          }
+        })
+      }
+
+      if (settings.shutDownInProgress) {
+        client.emit('connectionRejected', { message: 'retry' })
+        client.disconnect()
+        return
+      }
+
+      if (
+        client &&
+        error &&
+        error.message.match(/could not look up session by key/)
+      ) {
+        logger.warn(
+          { err: error, client: !!client, session: !!session },
+          'invalid session'
+        )
+        // tell the client to reauthenticate if it has an invalid session key
+        client.emit('connectionRejected', { message: 'invalid session' })
+        client.disconnect()
+        return
+      }
+
+      if (error) {
+        logger.err(
+          { err: error, client: !!client, session: !!session },
+          'error when client connected'
+        )
+        if (client) {
+          client.emit('connectionRejected', { message: 'error' })
+        }
+        if (client) {
+          client.disconnect()
+        }
+        return
+      }
+
+      // send positive confirmation that the client has a valid connection
+      client.publicId = 'P.' + base64id.generateId()
+      client.emit('connectionAccepted', null, client.publicId)
+
+      metrics.inc('socket-io.connection', 1, { status: client.transport })
+      metrics.gauge('socket-io.clients', io.sockets.clients().length)
+
+      logger.log({ session, client_id: client.id }, 'client connected')
+
+      let user
+      if (session && session.passport && session.passport.user) {
+        ;({ user } = session.passport)
+      } else if (session && session.user) {
+        ;({ user } = session)
+      } else {
+        user = { _id: 'anonymous-user' }
+      }
+
+      if (settings.exposeHostname) {
+        client.on('debug.getHostname', function (callback) {
+          if (typeof callback !== 'function') {
+            return Router._handleInvalidArguments(
+              client,
+              'debug.getHostname',
+              arguments
+            )
+          }
+          callback(HOSTNAME)
+        })
+      }
+
+      client.on('joinProject', function (data, callback) {
+        data = data || {}
+        if (typeof callback !== 'function') {
+          return Router._handleInvalidArguments(
+            client,
+            'joinProject',
+            arguments
+          )
+        }
+
+        if (data.anonymousAccessToken) {
+          user.anonymousAccessToken = data.anonymousAccessToken
+        }
+        WebsocketController.joinProject(
+          client,
+          user,
+          data.project_id,
+          function (err, ...args) {
+            if (err) {
+              Router._handleError(callback, err, client, 'joinProject', {
+                project_id: data.project_id,
+                user_id: user._id,
+              })
+            } else {
+              callback(null, ...args)
+            }
+          }
+        )
+      })
+
+      client.on('disconnect', function () {
+        metrics.inc('socket-io.disconnect', 1, { status: client.transport })
+        metrics.gauge('socket-io.clients', io.sockets.clients().length)
+
+        WebsocketController.leaveProject(io, client, function (err) {
+          if (err) {
+            Router._handleError(function () {}, err, client, 'leaveProject')
+          }
+        })
+      })
+
+      // Variadic. The possible arguments:
+      // doc_id, callback
+      // doc_id, fromVersion, callback
+      // doc_id, options, callback
+      // doc_id, fromVersion, options, callback
+      client.on('joinDoc', function (doc_id, fromVersion, options, callback) {
+        if (typeof fromVersion === 'function' && !options) {
+          callback = fromVersion
+          fromVersion = -1
+          options = {}
+        } else if (
+          typeof fromVersion === 'number' &&
+          typeof options === 'function'
+        ) {
+          callback = options
+          options = {}
+        } else if (
+          typeof fromVersion === 'object' &&
+          typeof options === 'function'
+        ) {
+          callback = options
+          options = fromVersion
+          fromVersion = -1
+        } else if (
+          typeof fromVersion === 'number' &&
+          typeof options === 'object' &&
+          typeof callback === 'function'
+        ) {
+          // Called with 4 args, things are as expected
+        } else {
+          return Router._handleInvalidArguments(client, 'joinDoc', arguments)
+        }
+
+        WebsocketController.joinDoc(
+          client,
+          doc_id,
+          fromVersion,
+          options,
+          function (err, ...args) {
+            if (err) {
+              Router._handleError(callback, err, client, 'joinDoc', {
+                doc_id,
+                fromVersion,
+              })
+            } else {
+              callback(null, ...args)
+            }
+          }
+        )
+      })
+
+      client.on('leaveDoc', function (doc_id, callback) {
+        if (typeof callback !== 'function') {
+          return Router._handleInvalidArguments(client, 'leaveDoc', arguments)
+        }
+
+        WebsocketController.leaveDoc(client, doc_id, function (err, ...args) {
+          if (err) {
+            Router._handleError(callback, err, client, 'leaveDoc', {
+              doc_id,
+            })
+          } else {
+            callback(null, ...args)
+          }
+        })
+      })
+
+      client.on('clientTracking.getConnectedUsers', function (callback) {
+        if (typeof callback !== 'function') {
+          return Router._handleInvalidArguments(
+            client,
+            'clientTracking.getConnectedUsers',
+            arguments
+          )
+        }
+
+        WebsocketController.getConnectedUsers(client, function (err, users) {
+          if (err) {
+            Router._handleError(
+              callback,
+              err,
+              client,
+              'clientTracking.getConnectedUsers'
+            )
+          } else {
+            callback(null, users)
+          }
+        })
+      })
+
+      client.on(
+        'clientTracking.updatePosition',
+        function (cursorData, callback) {
+          if (!callback) {
+            callback = function () {}
+          }
+          if (typeof callback !== 'function') {
+            return Router._handleInvalidArguments(
+              client,
+              'clientTracking.updatePosition',
+              arguments
+            )
+          }
+
+          WebsocketController.updateClientPosition(
+            client,
+            cursorData,
+            function (err) {
+              if (err) {
+                Router._handleError(
+                  callback,
+                  err,
+                  client,
+                  'clientTracking.updatePosition'
+                )
+              } else {
+                callback()
+              }
+            }
+          )
+        }
+      )
+
+      client.on('applyOtUpdate', function (doc_id, update, callback) {
+        if (typeof callback !== 'function') {
+          return Router._handleInvalidArguments(
+            client,
+            'applyOtUpdate',
+            arguments
+          )
+        }
+
+        WebsocketController.applyOtUpdate(
+          client,
+          doc_id,
+          update,
+          function (err) {
+            if (err) {
+              Router._handleError(callback, err, client, 'applyOtUpdate', {
+                doc_id,
+                update,
+              })
+            } else {
+              callback()
+            }
+          }
+        )
+      })
+    })
+  },
+}

services/real-time/app/js/SafeJsonParse.js

@@ -0,0 +1,17 @@
+const Settings = require('@overleaf/settings')
+const { DataTooLargeToParseError } = require('./Errors')
+
+module.exports = {
+  parse(data, callback) {
+    if (data.length > Settings.maxUpdateSize) {
+      return callback(new DataTooLargeToParseError(data))
+    }
+    let parsed
+    try {
+      parsed = JSON.parse(data)
+    } catch (e) {
+      return callback(e)
+    }
+    callback(null, parsed)
+  },
+}

services/real-time/app/js/SessionSockets.js

@@ -0,0 +1,36 @@
+const OError = require('@overleaf/o-error')
+const { EventEmitter } = require('events')
+const { MissingSessionError } = require('./Errors')
+
+module.exports = function (io, sessionStore, cookieParser, cookieName) {
+  const missingSessionError = new MissingSessionError()
+
+  const sessionSockets = new EventEmitter()
+  function next(error, socket, session) {
+    sessionSockets.emit('connection', error, socket, session)
+  }
+
+  io.on('connection', function (socket) {
+    const req = socket.handshake
+    cookieParser(req, {}, function () {
+      const sessionId = req.signedCookies && req.signedCookies[cookieName]
+      if (!sessionId) {
+        return next(missingSessionError, socket)
+      }
+      sessionStore.get(sessionId, function (error, session) {
+        if (error) {
+          OError.tag(error, 'error getting session from sessionStore', {
+            sessionId,
+          })
+          return next(error, socket)
+        }
+        if (!session) {
+          return next(missingSessionError, socket)
+        }
+        next(null, socket, session)
+      })
+    })
+  })
+
+  return sessionSockets
+}

services/real-time/app/js/WebApiManager.js

@@ -0,0 +1,69 @@
+/* eslint-disable
+    camelcase,
+*/
+const request = require('request')
+const OError = require('@overleaf/o-error')
+const settings = require('@overleaf/settings')
+const logger = require('logger-sharelatex')
+const {
+  CodedError,
+  CorruptedJoinProjectResponseError,
+  NotAuthorizedError,
+  WebApiRequestFailedError,
+} = require('./Errors')
+
+module.exports = {
+  joinProject(project_id, user, callback) {
+    const user_id = user._id
+    logger.log({ project_id, user_id }, 'sending join project request to web')
+    const url = `${settings.apis.web.url}/project/${project_id}/join`
+    const headers = {}
+    if (user.anonymousAccessToken) {
+      headers['x-sl-anonymous-access-token'] = user.anonymousAccessToken
+    }
+    request.post(
+      {
+        url,
+        qs: { user_id },
+        auth: {
+          user: settings.apis.web.user,
+          pass: settings.apis.web.pass,
+          sendImmediately: true,
+        },
+        json: true,
+        jar: false,
+        headers,
+      },
+      function (error, response, data) {
+        if (error) {
+          OError.tag(error, 'join project request failed')
+          return callback(error)
+        }
+        if (response.statusCode >= 200 && response.statusCode < 300) {
+          if (!(data && data.project)) {
+            return callback(new CorruptedJoinProjectResponseError())
+          }
+          callback(
+            null,
+            data.project,
+            data.privilegeLevel,
+            data.isRestrictedUser
+          )
+        } else if (response.statusCode === 429) {
+          callback(
+            new CodedError(
+              'rate-limit hit when joining project',
+              'TooManyRequests'
+            )
+          )
+        } else if (response.statusCode === 403) {
+          callback(new NotAuthorizedError())
+        } else if (response.statusCode === 404) {
+          callback(new CodedError('project not found', 'ProjectNotFound'))
+        } else {
+          callback(new WebApiRequestFailedError(response.statusCode))
+        }
+      }
+    )
+  },
+}

services/real-time/app/js/WebsocketController.js

@@ -0,0 +1,573 @@
+/* eslint-disable
+    camelcase,
+*/
+const OError = require('@overleaf/o-error')
+const logger = require('logger-sharelatex')
+const metrics = require('@overleaf/metrics')
+const WebApiManager = require('./WebApiManager')
+const AuthorizationManager = require('./AuthorizationManager')
+const DocumentUpdaterManager = require('./DocumentUpdaterManager')
+const ConnectedUsersManager = require('./ConnectedUsersManager')
+const WebsocketLoadBalancer = require('./WebsocketLoadBalancer')
+const RoomManager = require('./RoomManager')
+const {
+  JoinLeaveEpochMismatchError,
+  NotAuthorizedError,
+  NotJoinedError,
+} = require('./Errors')
+
+let WebsocketController
+module.exports = WebsocketController = {
+  // If the protocol version changes when the client reconnects,
+  // it will force a full refresh of the page. Useful for non-backwards
+  // compatible protocol changes. Use only in extreme need.
+  PROTOCOL_VERSION: 2,
+
+  joinProject(client, user, project_id, callback) {
+    if (client.disconnected) {
+      metrics.inc('editor.join-project.disconnected', 1, {
+        status: 'immediately',
+      })
+      return callback()
+    }
+
+    const user_id = user._id
+    logger.log(
+      { user_id, project_id, client_id: client.id },
+      'user joining project'
+    )
+    metrics.inc('editor.join-project', 1, { status: client.transport })
+    WebApiManager.joinProject(
+      project_id,
+      user,
+      function (error, project, privilegeLevel, isRestrictedUser) {
+        if (error) {
+          return callback(error)
+        }
+        if (client.disconnected) {
+          metrics.inc('editor.join-project.disconnected', 1, {
+            status: 'after-web-api-call',
+          })
+          return callback()
+        }
+
+        if (!privilegeLevel) {
+          return callback(new NotAuthorizedError())
+        }
+
+        client.ol_context = {}
+        client.ol_context.privilege_level = privilegeLevel
+        client.ol_context.user_id = user_id
+        client.ol_context.project_id = project_id
+        client.ol_context.owner_id = project.owner && project.owner._id
+        client.ol_context.first_name = user.first_name
+        client.ol_context.last_name = user.last_name
+        client.ol_context.email = user.email
+        client.ol_context.connected_time = new Date()
+        client.ol_context.signup_date = user.signUpDate
+        client.ol_context.login_count = user.loginCount
+        client.ol_context.is_restricted_user = !!isRestrictedUser
+
+        RoomManager.joinProject(client, project_id, function (err) {
+          if (err) {
+            return callback(err)
+          }
+          logger.log(
+            { user_id, project_id, client_id: client.id },
+            'user joined project'
+          )
+          callback(
+            null,
+            project,
+            privilegeLevel,
+            WebsocketController.PROTOCOL_VERSION
+          )
+        })
+
+        // No need to block for setting the user as connected in the cursor tracking
+        ConnectedUsersManager.updateUserPosition(
+          project_id,
+          client.publicId,
+          user,
+          null,
+          function (err) {
+            if (err) {
+              logger.warn(
+                { err, project_id, user_id, client_id: client.id },
+                'background cursor update failed'
+              )
+            }
+          }
+        )
+      }
+    )
+  },
+
+  // We want to flush a project if there are no more (local) connected clients
+  // but we need to wait for the triggering client to disconnect. How long we wait
+  // is determined by FLUSH_IF_EMPTY_DELAY.
+  FLUSH_IF_EMPTY_DELAY: 500, // ms
+  leaveProject(io, client, callback) {
+    const { project_id, user_id } = client.ol_context
+    if (!project_id) {
+      return callback()
+    } // client did not join project
+
+    metrics.inc('editor.leave-project', 1, { status: client.transport })
+    logger.log(
+      { project_id, user_id, client_id: client.id },
+      'client leaving project'
+    )
+    WebsocketLoadBalancer.emitToRoom(
+      project_id,
+      'clientTracking.clientDisconnected',
+      client.publicId
+    )
+
+    // We can do this in the background
+    ConnectedUsersManager.markUserAsDisconnected(
+      project_id,
+      client.publicId,
+      function (err) {
+        if (err) {
+          logger.error(
+            { err, project_id, user_id, client_id: client.id },
+            'error marking client as disconnected'
+          )
+        }
+      }
+    )
+
+    RoomManager.leaveProjectAndDocs(client)
+    setTimeout(function () {
+      const remainingClients = io.sockets.clients(project_id)
+      if (remainingClients.length === 0) {
+        // Flush project in the background
+        DocumentUpdaterManager.flushProjectToMongoAndDelete(
+          project_id,
+          function (err) {
+            if (err) {
+              logger.error(
+                { err, project_id, user_id, client_id: client.id },
+                'error flushing to doc updater after leaving project'
+              )
+            }
+          }
+        )
+      }
+      callback()
+    }, WebsocketController.FLUSH_IF_EMPTY_DELAY)
+  },
+
+  joinDoc(client, doc_id, fromVersion, options, callback) {
+    if (client.disconnected) {
+      metrics.inc('editor.join-doc.disconnected', 1, { status: 'immediately' })
+      return callback()
+    }
+
+    const joinLeaveEpoch = ++client.joinLeaveEpoch
+    metrics.inc('editor.join-doc', 1, { status: client.transport })
+    const { project_id, user_id, is_restricted_user } = client.ol_context
+    if (!project_id) {
+      return callback(new NotJoinedError())
+    }
+    logger.log(
+      { user_id, project_id, doc_id, fromVersion, client_id: client.id },
+      'client joining doc'
+    )
+
+    WebsocketController._assertClientAuthorization(
+      client,
+      doc_id,
+      function (error) {
+        if (error) {
+          return callback(error)
+        }
+        if (client.disconnected) {
+          metrics.inc('editor.join-doc.disconnected', 1, {
+            status: 'after-client-auth-check',
+          })
+          // the client will not read the response anyways
+          return callback()
+        }
+        if (joinLeaveEpoch !== client.joinLeaveEpoch) {
+          // another joinDoc or leaveDoc rpc overtook us
+          return callback(new JoinLeaveEpochMismatchError())
+        }
+        // ensure the per-doc applied-ops channel is subscribed before sending the
+        // doc to the client, so that no events are missed.
+        RoomManager.joinDoc(client, doc_id, function (error) {
+          if (error) {
+            return callback(error)
+          }
+          if (client.disconnected) {
+            metrics.inc('editor.join-doc.disconnected', 1, {
+              status: 'after-joining-room',
+            })
+            // the client will not read the response anyways
+            return callback()
+          }
+
+          DocumentUpdaterManager.getDocument(
+            project_id,
+            doc_id,
+            fromVersion,
+            function (error, lines, version, ranges, ops) {
+              if (error) {
+                return callback(error)
+              }
+              if (client.disconnected) {
+                metrics.inc('editor.join-doc.disconnected', 1, {
+                  status: 'after-doc-updater-call',
+                })
+                // the client will not read the response anyways
+                return callback()
+              }
+
+              if (is_restricted_user && ranges && ranges.comments) {
+                ranges.comments = []
+              }
+
+              // Encode any binary bits of data so it can go via WebSockets
+              // See http://ecmanaut.blogspot.co.uk/2006/07/encoding-decoding-utf8-in-javascript.html
+              const encodeForWebsockets = text =>
+                unescape(encodeURIComponent(text))
+              const escapedLines = []
+              for (let line of lines) {
+                try {
+                  line = encodeForWebsockets(line)
+                } catch (err) {
+                  OError.tag(err, 'error encoding line uri component', { line })
+                  return callback(err)
+                }
+                escapedLines.push(line)
+              }
+              if (options.encodeRanges) {
+                try {
+                  for (const comment of (ranges && ranges.comments) || []) {
+                    if (comment.op.c) {
+                      comment.op.c = encodeForWebsockets(comment.op.c)
+                    }
+                  }
+                  for (const change of (ranges && ranges.changes) || []) {
+                    if (change.op.i) {
+                      change.op.i = encodeForWebsockets(change.op.i)
+                    }
+                    if (change.op.d) {
+                      change.op.d = encodeForWebsockets(change.op.d)
+                    }
+                  }
+                } catch (err) {
+                  OError.tag(err, 'error encoding range uri component', {
+                    ranges,
+                  })
+                  return callback(err)
+                }
+              }
+
+              AuthorizationManager.addAccessToDoc(client, doc_id, () => {})
+              logger.log(
+                {
+                  user_id,
+                  project_id,
+                  doc_id,
+                  fromVersion,
+                  client_id: client.id,
+                },
+                'client joined doc'
+              )
+              callback(null, escapedLines, version, ops, ranges)
+            }
+          )
+        })
+      }
+    )
+  },
+
+  _assertClientAuthorization(client, doc_id, callback) {
+    // Check for project-level access first
+    AuthorizationManager.assertClientCanViewProject(client, function (error) {
+      if (error) {
+        return callback(error)
+      }
+      // Check for doc-level access next
+      AuthorizationManager.assertClientCanViewProjectAndDoc(
+        client,
+        doc_id,
+        function (error) {
+          if (error) {
+            // No cached access, check docupdater
+            const { project_id } = client.ol_context
+            DocumentUpdaterManager.checkDocument(
+              project_id,
+              doc_id,
+              function (error) {
+                if (error) {
+                  return callback(error)
+                } else {
+                  // Success
+                  AuthorizationManager.addAccessToDoc(client, doc_id, callback)
+                }
+              }
+            )
+          } else {
+            // Access already cached
+            callback()
+          }
+        }
+      )
+    })
+  },
+
+  leaveDoc(client, doc_id, callback) {
+    // client may have disconnected, but we have to cleanup internal state.
+    client.joinLeaveEpoch++
+    metrics.inc('editor.leave-doc', 1, { status: client.transport })
+    const { project_id, user_id } = client.ol_context
+    logger.log(
+      { user_id, project_id, doc_id, client_id: client.id },
+      'client leaving doc'
+    )
+    RoomManager.leaveDoc(client, doc_id)
+    // we could remove permission when user leaves a doc, but because
+    // the connection is per-project, we continue to allow access
+    // after the initial joinDoc since we know they are already authorised.
+    // # AuthorizationManager.removeAccessToDoc client, doc_id
+    callback()
+  },
+  updateClientPosition(client, cursorData, callback) {
+    if (client.disconnected) {
+      // do not create a ghost entry in redis
+      return callback()
+    }
+
+    metrics.inc('editor.update-client-position', 0.1, {
+      status: client.transport,
+    })
+    const { project_id, first_name, last_name, email, user_id } =
+      client.ol_context
+    logger.log(
+      { user_id, project_id, client_id: client.id, cursorData },
+      'updating client position'
+    )
+
+    AuthorizationManager.assertClientCanViewProjectAndDoc(
+      client,
+      cursorData.doc_id,
+      function (error) {
+        if (error) {
+          logger.info(
+            { err: error, client_id: client.id, project_id, user_id },
+            "silently ignoring unauthorized updateClientPosition. Client likely hasn't called joinProject yet."
+          )
+          return callback()
+        }
+        cursorData.id = client.publicId
+        if (user_id) {
+          cursorData.user_id = user_id
+        }
+        if (email) {
+          cursorData.email = email
+        }
+        // Don't store anonymous users in redis to avoid influx
+        if (!user_id || user_id === 'anonymous-user') {
+          cursorData.name = ''
+          // consistent async behaviour
+          setTimeout(callback)
+        } else {
+          cursorData.name =
+            first_name && last_name
+              ? `${first_name} ${last_name}`
+              : first_name || last_name || ''
+          ConnectedUsersManager.updateUserPosition(
+            project_id,
+            client.publicId,
+            {
+              first_name,
+              last_name,
+              email,
+              _id: user_id,
+            },
+            {
+              row: cursorData.row,
+              column: cursorData.column,
+              doc_id: cursorData.doc_id,
+            },
+            callback
+          )
+        }
+        WebsocketLoadBalancer.emitToRoom(
+          project_id,
+          'clientTracking.clientUpdated',
+          cursorData
+        )
+      }
+    )
+  },
+
+  CLIENT_REFRESH_DELAY: 1000,
+  getConnectedUsers(client, callback) {
+    if (client.disconnected) {
+      // they are not interested anymore, skip the redis lookups
+      return callback()
+    }
+
+    metrics.inc('editor.get-connected-users', { status: client.transport })
+    const { project_id, user_id, is_restricted_user } = client.ol_context
+    if (is_restricted_user) {
+      return callback(null, [])
+    }
+    if (!project_id) {
+      return callback(new NotJoinedError())
+    }
+    logger.log(
+      { user_id, project_id, client_id: client.id },
+      'getting connected users'
+    )
+    AuthorizationManager.assertClientCanViewProject(client, function (error) {
+      if (error) {
+        return callback(error)
+      }
+      WebsocketLoadBalancer.emitToRoom(project_id, 'clientTracking.refresh')
+      setTimeout(
+        () =>
+          ConnectedUsersManager.getConnectedUsers(
+            project_id,
+            function (error, users) {
+              if (error) {
+                return callback(error)
+              }
+              logger.log(
+                { user_id, project_id, client_id: client.id },
+                'got connected users'
+              )
+              callback(null, users)
+            }
+          ),
+        WebsocketController.CLIENT_REFRESH_DELAY
+      )
+    })
+  },
+
+  applyOtUpdate(client, doc_id, update, callback) {
+    // client may have disconnected, but we can submit their update to doc-updater anyways.
+    const { user_id, project_id } = client.ol_context
+    if (!project_id) {
+      return callback(new NotJoinedError())
+    }
+
+    WebsocketController._assertClientCanApplyUpdate(
+      client,
+      doc_id,
+      update,
+      function (error) {
+        if (error) {
+          setTimeout(
+            () =>
+              // Disconnect, but give the client the chance to receive the error
+              client.disconnect(),
+            100
+          )
+          return callback(error)
+        }
+        if (!update.meta) {
+          update.meta = {}
+        }
+        update.meta.source = client.publicId
+        update.meta.user_id = user_id
+        metrics.inc('editor.doc-update', 0.3, { status: client.transport })
+
+        logger.log(
+          {
+            user_id,
+            doc_id,
+            project_id,
+            client_id: client.id,
+            version: update.v,
+          },
+          'sending update to doc updater'
+        )
+
+        DocumentUpdaterManager.queueChange(
+          project_id,
+          doc_id,
+          update,
+          function (error) {
+            if ((error && error.message) === 'update is too large') {
+              metrics.inc('update_too_large')
+              const { updateSize } = error.info
+              logger.warn(
+                { user_id, project_id, doc_id, updateSize },
+                'update is too large'
+              )
+
+              // mark the update as received -- the client should not send it again!
+              callback()
+
+              // trigger an out-of-sync error
+              const message = {
+                project_id,
+                doc_id,
+                error: 'update is too large',
+              }
+              setTimeout(function () {
+                if (client.disconnected) {
+                  // skip the message broadcast, the client has moved on
+                  return metrics.inc('editor.doc-update.disconnected', 1, {
+                    status: 'at-otUpdateError',
+                  })
+                }
+                client.emit('otUpdateError', message.error, message)
+                client.disconnect()
+              }, 100)
+              return
+            }
+
+            if (error) {
+              OError.tag(error, 'document was not available for update', {
+                version: update.v,
+              })
+              client.disconnect()
+            }
+            callback(error)
+          }
+        )
+      }
+    )
+  },
+
+  _assertClientCanApplyUpdate(client, doc_id, update, callback) {
+    AuthorizationManager.assertClientCanEditProjectAndDoc(
+      client,
+      doc_id,
+      function (error) {
+        if (
+          error &&
+          error.message === 'not authorized' &&
+          WebsocketController._isCommentUpdate(update)
+        ) {
+          // This might be a comment op, which we only need read-only priveleges for
+          AuthorizationManager.assertClientCanViewProjectAndDoc(
+            client,
+            doc_id,
+            callback
+          )
+          return
+        }
+        callback(error)
+      }
+    )
+  },
+
+  _isCommentUpdate(update) {
+    if (!(update && update.op instanceof Array)) {
+      return false
+    }
+    for (const op of update.op) {
+      if (!op.c) {
+        return false
+      }
+    }
+    return true
+  },
+}

services/real-time/app/js/WebsocketLoadBalancer.js

@@ -0,0 +1,171 @@
+/* eslint-disable
+    camelcase,
+*/
+const Settings = require('@overleaf/settings')
+const logger = require('logger-sharelatex')
+const RedisClientManager = require('./RedisClientManager')
+const SafeJsonParse = require('./SafeJsonParse')
+const EventLogger = require('./EventLogger')
+const HealthCheckManager = require('./HealthCheckManager')
+const RoomManager = require('./RoomManager')
+const ChannelManager = require('./ChannelManager')
+const ConnectedUsersManager = require('./ConnectedUsersManager')
+
+const RESTRICTED_USER_MESSAGE_TYPE_PASS_LIST = [
+  'connectionAccepted',
+  'otUpdateApplied',
+  'otUpdateError',
+  'joinDoc',
+  'reciveNewDoc',
+  'reciveNewFile',
+  'reciveNewFolder',
+  'removeEntity',
+]
+
+let WebsocketLoadBalancer
+module.exports = WebsocketLoadBalancer = {
+  rclientPubList: RedisClientManager.createClientList(Settings.redis.pubsub),
+  rclientSubList: RedisClientManager.createClientList(Settings.redis.pubsub),
+
+  emitToRoom(room_id, message, ...payload) {
+    if (!room_id) {
+      logger.warn(
+        { message, payload },
+        'no room_id provided, ignoring emitToRoom'
+      )
+      return
+    }
+    const data = JSON.stringify({
+      room_id,
+      message,
+      payload,
+    })
+    logger.log(
+      { room_id, message, payload, length: data.length },
+      'emitting to room'
+    )
+
+    this.rclientPubList.map(rclientPub =>
+      ChannelManager.publish(rclientPub, 'editor-events', room_id, data)
+    )
+  },
+
+  emitToAll(message, ...payload) {
+    this.emitToRoom('all', message, ...payload)
+  },
+
+  listenForEditorEvents(io) {
+    logger.log(
+      { rclients: this.rclientSubList.length },
+      'listening for editor events'
+    )
+    for (const rclientSub of this.rclientSubList) {
+      rclientSub.subscribe('editor-events')
+      rclientSub.on('message', function (channel, message) {
+        if (Settings.debugEvents > 0) {
+          EventLogger.debugEvent(channel, message)
+        }
+        WebsocketLoadBalancer._processEditorEvent(io, channel, message)
+      })
+    }
+    this.handleRoomUpdates(this.rclientSubList)
+  },
+
+  handleRoomUpdates(rclientSubList) {
+    const roomEvents = RoomManager.eventSource()
+    roomEvents.on('project-active', function (project_id) {
+      const subscribePromises = rclientSubList.map(rclient =>
+        ChannelManager.subscribe(rclient, 'editor-events', project_id)
+      )
+      RoomManager.emitOnCompletion(
+        subscribePromises,
+        `project-subscribed-${project_id}`
+      )
+    })
+    roomEvents.on('project-empty', project_id =>
+      rclientSubList.map(rclient =>
+        ChannelManager.unsubscribe(rclient, 'editor-events', project_id)
+      )
+    )
+  },
+
+  _processEditorEvent(io, channel, message) {
+    SafeJsonParse.parse(message, function (error, message) {
+      if (error) {
+        logger.error({ err: error, channel }, 'error parsing JSON')
+        return
+      }
+      if (message.room_id === 'all') {
+        io.sockets.emit(message.message, ...message.payload)
+      } else if (
+        message.message === 'clientTracking.refresh' &&
+        message.room_id
+      ) {
+        const clientList = io.sockets.clients(message.room_id)
+        logger.log(
+          {
+            channel,
+            message: message.message,
+            room_id: message.room_id,
+            message_id: message._id,
+            socketIoClients: clientList.map(client => client.id),
+          },
+          'refreshing client list'
+        )
+        for (const client of clientList) {
+          ConnectedUsersManager.refreshClient(message.room_id, client.publicId)
+        }
+      } else if (message.room_id) {
+        if (message._id && Settings.checkEventOrder) {
+          const status = EventLogger.checkEventOrder(
+            'editor-events',
+            message._id,
+            message
+          )
+          if (status === 'duplicate') {
+            return // skip duplicate events
+          }
+        }
+
+        const is_restricted_message =
+          !RESTRICTED_USER_MESSAGE_TYPE_PASS_LIST.includes(message.message)
+
+        // send messages only to unique clients (due to duplicate entries in io.sockets.clients)
+        const clientList = io.sockets
+          .clients(message.room_id)
+          .filter(
+            client =>
+              !(is_restricted_message && client.ol_context.is_restricted_user)
+          )
+
+        // avoid unnecessary work if no clients are connected
+        if (clientList.length === 0) {
+          return
+        }
+        logger.log(
+          {
+            channel,
+            message: message.message,
+            room_id: message.room_id,
+            message_id: message._id,
+            socketIoClients: clientList.map(client => client.id),
+          },
+          'distributing event to clients'
+        )
+        const seen = new Map()
+        for (const client of clientList) {
+          if (!seen.has(client.id)) {
+            seen.set(client.id, true)
+            client.emit(message.message, ...message.payload)
+          }
+        }
+      } else if (message.health_check) {
+        logger.debug(
+          { message },
+          'got health check message in editor events channel'
+        )
+        HealthCheckManager.check(channel, message.key)
+      }
+    })
+  },
+}

services/real-time/buildscript.txt

@@ -0,0 +1,8 @@
+real-time
+--dependencies=redis
+--docker-repos=gcr.io/overleaf-ops
+--env-add=
+--env-pass-through=
+--node-version=12.22.3
+--public-repo=True
+--script-version=3.11.0

services/real-time/config/settings.defaults.js

@@ -0,0 +1,168 @@
+/* eslint-disable camelcase */
+
+const settings = {
+  redis: {
+    pubsub: {
+      host:
+        process.env.PUBSUB_REDIS_HOST || process.env.REDIS_HOST || 'localhost',
+      port: process.env.PUBSUB_REDIS_PORT || process.env.REDIS_PORT || '6379',
+      password:
+        process.env.PUBSUB_REDIS_PASSWORD || process.env.REDIS_PASSWORD || '',
+      maxRetriesPerRequest: parseInt(
+        process.env.PUBSUB_REDIS_MAX_RETRIES_PER_REQUEST ||
+          process.env.REDIS_MAX_RETRIES_PER_REQUEST ||
+          '20'
+      ),
+    },
+
+    realtime: {
+      host:
+        process.env.REAL_TIME_REDIS_HOST ||
+        process.env.REDIS_HOST ||
+        'localhost',
+      port:
+        process.env.REAL_TIME_REDIS_PORT || process.env.REDIS_PORT || '6379',
+      password:
+        process.env.REAL_TIME_REDIS_PASSWORD ||
+        process.env.REDIS_PASSWORD ||
+        '',
+      key_schema: {
+        clientsInProject({ project_id }) {
+          return `clients_in_project:{${project_id}}`
+        },
+        connectedUser({ project_id, client_id }) {
+          return `connected_user:{${project_id}}:${client_id}`
+        },
+      },
+      maxRetriesPerRequest: parseInt(
+        process.env.REAL_TIME_REDIS_MAX_RETRIES_PER_REQUEST ||
+          process.env.REDIS_MAX_RETRIES_PER_REQUEST ||
+          '20'
+      ),
+    },
+
+    documentupdater: {
+      host:
+        process.env.DOC_UPDATER_REDIS_HOST ||
+        process.env.REDIS_HOST ||
+        'localhost',
+      port:
+        process.env.DOC_UPDATER_REDIS_PORT || process.env.REDIS_PORT || '6379',
+      password:
+        process.env.DOC_UPDATER_REDIS_PASSWORD ||
+        process.env.REDIS_PASSWORD ||
+        '',
+      key_schema: {
+        pendingUpdates({ doc_id }) {
+          return `PendingUpdates:{${doc_id}}`
+        },
+      },
+      maxRetriesPerRequest: parseInt(
+        process.env.DOC_UPDATER_REDIS_MAX_RETRIES_PER_REQUEST ||
+          process.env.REDIS_MAX_RETRIES_PER_REQUEST ||
+          '20'
+      ),
+    },
+
+    websessions: {
+      host: process.env.WEB_REDIS_HOST || process.env.REDIS_HOST || 'localhost',
+      port: process.env.WEB_REDIS_PORT || process.env.REDIS_PORT || '6379',
+      password:
+        process.env.WEB_REDIS_PASSWORD || process.env.REDIS_PASSWORD || '',
+      maxRetriesPerRequest: parseInt(
+        process.env.WEB_REDIS_MAX_RETRIES_PER_REQUEST ||
+          process.env.REDIS_MAX_RETRIES_PER_REQUEST ||
+          '20'
+      ),
+    },
+  },
+
+  internal: {
+    realTime: {
+      port: 3026,
+      host: process.env.LISTEN_ADDRESS || 'localhost',
+      user: 'sharelatex',
+      pass: 'password',
+    },
+  },
+
+  apis: {
+    web: {
+      url: `http://${
+        process.env.WEB_API_HOST || process.env.WEB_HOST || 'localhost'
+      }:${process.env.WEB_API_PORT || process.env.WEB_PORT || 3000}`,
+      user: process.env.WEB_API_USER || 'sharelatex',
+      pass: process.env.WEB_API_PASSWORD || 'password',
+    },
+    documentupdater: {
+      url: `http://${
+        process.env.DOCUMENT_UPDATER_HOST ||
+        process.env.DOCUPDATER_HOST ||
+        'localhost'
+      }:3003`,
+    },
+  },
+
+  security: {
+    sessionSecret: process.env.SESSION_SECRET || 'secret-please-change',
+  },
+
+  cookieName: process.env.COOKIE_NAME || 'sharelatex.sid',
+
+  // Expose the hostname in the `debug.getHostname` rpc
+  exposeHostname: process.env.EXPOSE_HOSTNAME === 'true',
+
+  max_doc_length: 2 * 1024 * 1024, // 2mb
+
+  // should be set to the same same as dispatcherCount in document updater
+  pendingUpdateListShardCount: parseInt(
+    process.env.PENDING_UPDATE_LIST_SHARD_COUNT || 10,
+    10
+  ),
+
+  // combine
+  // max_doc_length (2mb see above) * 2 (delete + insert)
+  // max_ranges_size (3mb see MAX_RANGES_SIZE in document-updater)
+  // overhead for JSON serialization
+  maxUpdateSize:
+    parseInt(process.env.MAX_UPDATE_SIZE) || 7 * 1024 * 1024 + 64 * 1024,
+
+  shutdownDrainTimeWindow: process.env.SHUTDOWN_DRAIN_TIME_WINDOW || 9,
+
+  // The shutdown procedure asks clients to reconnect gracefully.
+  // 3rd-party/buggy clients may not act upon receiving the message and keep
+  //  stale connections alive. We forcefully disconnect them after X ms:
+  gracefulReconnectTimeoutMs:
+    parseInt(process.env.GRACEFUL_RECONNECT_TIMEOUT_MS, 10) ||
+    // The frontend allows actively editing users to keep the connection open
+    //  for up-to ConnectionManager.MAX_RECONNECT_GRACEFULLY_INTERVAL=45s
+    // Permit an extra delay to account for slow/flaky connections.
+    (45 + 30) * 1000,
+
+  continualPubsubTraffic: process.env.CONTINUAL_PUBSUB_TRAFFIC || false,
+
+  checkEventOrder: process.env.CHECK_EVENT_ORDER || false,
+
+  publishOnIndividualChannels:
+    process.env.PUBLISH_ON_INDIVIDUAL_CHANNELS || false,
+
+  statusCheckInterval: parseInt(process.env.STATUS_CHECK_INTERVAL || '0'),
+
+  // The deployment colour for this app (if any). Used for blue green deploys.
+  deploymentColour: process.env.DEPLOYMENT_COLOUR,
+  // Load balancer health checks will return 200 only when this file contains
+  // the deployment colour for this app.
+  deploymentFile: process.env.DEPLOYMENT_FILE,
+
+  sentry: {
+    dsn: process.env.SENTRY_DSN,
+  },
+
+  errors: {
+    catchUncaughtErrors: true,
+    shutdownOnUncaughtError: true,
+  },
+}
+
+// console.log settings.redis
+module.exports = settings

services/real-time/config/settings.test.js

@@ -0,0 +1,5 @@
+module.exports = {
+  errors: {
+    catchUncaughtErrors: false,
+  },
+}

services/real-time/docker-compose.ci.yml

@@ -0,0 +1,49 @@
+# This file was auto-generated, do not edit it directly.
+# Instead run bin/update_build_scripts from
+# https://github.com/sharelatex/sharelatex-dev-environment
+
+version: "2.3"
+
+services:
+  test_unit:
+    image: ci/$PROJECT_NAME:$BRANCH_NAME-$BUILD_NUMBER
+    user: node
+    command: npm run test:unit:_run
+    environment:
+      NODE_ENV: test
+      NODE_OPTIONS: "--unhandled-rejections=strict"
+
+
+  test_acceptance:
+    build: .
+    image: ci/$PROJECT_NAME:$BRANCH_NAME-$BUILD_NUMBER
+    environment:
+      ELASTIC_SEARCH_DSN: es:9200
+      REDIS_HOST: redis
+      QUEUES_REDIS_HOST: redis
+      MONGO_HOST: mongo
+      POSTGRES_HOST: postgres
+      MOCHA_GREP: ${MOCHA_GREP}
+      NODE_ENV: test
+      NODE_OPTIONS: "--unhandled-rejections=strict"
+    depends_on:
+      redis:
+        condition: service_healthy
+    user: node
+    command: npm run test:acceptance:_run
+
+
+  tar:
+    build: .
+    image: ci/$PROJECT_NAME:$BRANCH_NAME-$BUILD_NUMBER
+    volumes:
+      - ./:/tmp/build/
+    command: tar -czf /tmp/build/build.tar.gz --exclude=build.tar.gz --exclude-vcs .
+    user: root
+  redis:
+    image: redis
+    healthcheck:
+      test: ping="$$(redis-cli ping)" && [ "$$ping" = 'PONG' ]
+      interval: 1s
+      retries: 20
+

services/real-time/docker-compose.yml

@@ -0,0 +1,47 @@
+# This file was auto-generated, do not edit it directly.
+# Instead run bin/update_build_scripts from
+# https://github.com/sharelatex/sharelatex-dev-environment
+
+version: "2.3"
+
+services:
+  test_unit:
+    image: node:12.22.3
+    volumes:
+      - .:/app
+    working_dir: /app
+    environment:
+      MOCHA_GREP: ${MOCHA_GREP}
+      NODE_ENV: test
+      NODE_OPTIONS: "--unhandled-rejections=strict"
+    command: npm run --silent test:unit
+    user: node
+
+  test_acceptance:
+    image: node:12.22.3
+    volumes:
+      - .:/app
+    working_dir: /app
+    environment:
+      ELASTIC_SEARCH_DSN: es:9200
+      REDIS_HOST: redis
+      QUEUES_REDIS_HOST: redis
+      MONGO_HOST: mongo
+      POSTGRES_HOST: postgres
+      MOCHA_GREP: ${MOCHA_GREP}
+      LOG_LEVEL: ERROR
+      NODE_ENV: test
+      NODE_OPTIONS: "--unhandled-rejections=strict"
+    user: node
+    depends_on:
+      redis:
+        condition: service_healthy
+    command: npm run --silent test:acceptance
+
+  redis:
+    image: redis
+    healthcheck:
+      test: ping=$$(redis-cli ping) && [ "$$ping" = 'PONG' ]
+      interval: 1s
+      retries: 20
+

services/real-time/nodemon.json

@@ -0,0 +1,17 @@
+{
+  "ignore": [
+    ".git",
+    "node_modules/"
+  ],
+  "verbose": true,
+  "legacyWatch": true,
+  "execMap": {
+    "js": "npm run start"
+  },
+  "watch": [
+    "app/js/",
+    "app.js",
+    "config/"
+  ],
+  "ext": "js"
+}

services/real-time/package-lock.json

@@ -0,0 +1,5587 @@
+{
+  "name": "real-time-sharelatex",
+  "version": "0.1.4",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.12.11",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.12.11.tgz",
+      "integrity": "sha512-Zt1yodBx1UcyiePMSkWnU4hPqhwq7hGi2nFL1LeA3EUl+q2LQx16MISgJ0+z7dnmgvP9QtIleuETGOiOH1RcIw==",
+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.10.4"
+      }
+    },
+    "@babel/helper-validator-identifier": {
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.14.5.tgz",
+      "integrity": "sha512-5lsetuxCLilmVGyiLEfoHBRX8UCFD+1m2x3Rj97WrW3V7H3u4RWRXA4evMjImCsin2J2YT0QaVDGf+z8ondbAg==",
+      "dev": true
+    },
+    "@babel/highlight": {
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.14.5.tgz",
+      "integrity": "sha512-qf9u2WFWVV0MppaL877j2dBtQIDgmidgjGk5VIMw3OadXvYaXn66U1BFlH2t4+t3i+8PhedppRv+i40ABzd+gg==",
+      "dev": true,
+      "requires": {
+        "@babel/helper-validator-identifier": "^7.14.5",
+        "chalk": "^2.0.0",
+        "js-tokens": "^4.0.0"
+      }
+    },
+    "@eslint/eslintrc": {
+      "version": "0.4.2",
+      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-0.4.2.tgz",
+      "integrity": "sha512-8nmGq/4ycLpIwzvhI4tNDmQztZ8sp+hI7cyG8i1nQDhkAbRzHpXPidRAHlNvCZQpJTKw5ItIpMw9RSToGF00mg==",
+      "dev": true,
+      "requires": {
+        "ajv": "^6.12.4",
+        "debug": "^4.1.1",
+        "espree": "^7.3.0",
+        "globals": "^13.9.0",
+        "ignore": "^4.0.6",
+        "import-fresh": "^3.2.1",
+        "js-yaml": "^3.13.1",
+        "minimatch": "^3.0.4",
+        "strip-json-comments": "^3.1.1"
+      },
+      "dependencies": {
+        "ajv": {
+          "version": "6.12.6",
+          "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
+          "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
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+}

services/real-time/package.json

@@ -0,0 +1,65 @@
+{
+  "name": "real-time-sharelatex",
+  "version": "0.1.4",
+  "description": "The socket.io layer of ShareLaTeX for real-time editor interactions",
+  "author": "ShareLaTeX <team@sharelatex.com>",
+  "license": "AGPL-3.0-only",
+  "private": true,
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/sharelatex/real-time-sharelatex.git"
+  },
+  "scripts": {
+    "start": "node $NODE_APP_OPTIONS app.js",
+    "test:acceptance:_run": "mocha --recursive --reporter spec --timeout 15000 --exit $@ test/acceptance/js",
+    "test:acceptance": "npm run test:acceptance:_run -- --grep=$MOCHA_GREP",
+    "test:unit:_run": "mocha --recursive --reporter spec $@ test/unit/js",
+    "test:unit": "npm run test:unit:_run -- --grep=$MOCHA_GREP",
+    "nodemon": "nodemon --config nodemon.json",
+    "lint": "eslint --max-warnings 0 --format unix .",
+    "format": "prettier --list-different $PWD/'**/*.js'",
+    "format:fix": "prettier --write $PWD/'**/*.js'",
+    "lint:fix": "eslint --fix ."
+  },
+  "dependencies": {
+    "@overleaf/metrics": "^3.5.1",
+    "@overleaf/o-error": "^3.1.0",
+    "@overleaf/redis-wrapper": "^2.0.0",
+    "@overleaf/settings": "^2.1.1",
+    "async": "^0.9.0",
+    "base64id": "0.1.0",
+    "basic-auth-connect": "^1.0.0",
+    "body-parser": "^1.19.0",
+    "bunyan": "^1.8.15",
+    "connect-redis": "^2.1.0",
+    "cookie-parser": "^1.4.5",
+    "express": "^4.17.1",
+    "express-session": "^1.17.1",
+    "logger-sharelatex": "^2.2.0",
+    "request": "^2.88.2",
+    "socket.io": "https://github.com/overleaf/socket.io/archive/0.9.19-overleaf-5.tar.gz",
+    "socket.io-client": "https://github.com/overleaf/socket.io-client/archive/0.9.17-overleaf-3.tar.gz",
+    "underscore": "1.13.1"
+  },
+  "devDependencies": {
+    "chai": "^4.2.0",
+    "chai-as-promised": "^7.1.1",
+    "cookie-signature": "^1.1.0",
+    "eslint": "^7.21.0",
+    "eslint-config-prettier": "^8.1.0",
+    "eslint-config-standard": "^16.0.2",
+    "eslint-plugin-chai-expect": "^2.2.0",
+    "eslint-plugin-chai-friendly": "^0.6.0",
+    "eslint-plugin-import": "^2.22.1",
+    "eslint-plugin-mocha": "^8.0.0",
+    "eslint-plugin-node": "^11.1.0",
+    "eslint-plugin-prettier": "^3.1.2",
+    "eslint-plugin-promise": "^4.2.1",
+    "mocha": "^8.3.2",
+    "prettier": "^2.2.1",
+    "sandboxed-module": "~0.3.0",
+    "sinon": "^9.2.4",
+    "timekeeper": "0.0.4",
+    "uid-safe": "^2.1.5"
+  }
+}

services/real-time/test/acceptance/js/ApplyUpdateTests.js

@@ -0,0 +1,475 @@
+/* eslint-disable
+    camelcase,
+    handle-callback-err,
+    no-return-assign,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS101: Remove unnecessary use of Array.from
+ * DS102: Remove unnecessary code created because of implicit returns
+ * DS201: Simplify complex destructure assignments
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const async = require('async')
+const { expect } = require('chai')
+
+const RealTimeClient = require('./helpers/RealTimeClient')
+const FixturesManager = require('./helpers/FixturesManager')
+
+const settings = require('@overleaf/settings')
+const redis = require('@overleaf/redis-wrapper')
+const rclient = redis.createClient(settings.redis.documentupdater)
+
+const redisSettings = settings.redis
+
+const PENDING_UPDATES_LIST_KEYS = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9].map(n => {
+  let key = 'pending-updates-list'
+  if (n !== 0) {
+    key += `-${n}`
+  }
+  return key
+})
+
+function getPendingUpdatesList(cb) {
+  Promise.all(PENDING_UPDATES_LIST_KEYS.map(key => rclient.lrange(key, 0, -1)))
+    .then(results => {
+      cb(
+        null,
+        results.reduce((acc, more) => {
+          if (more.length) {
+            acc.push(...more)
+          }
+          return acc
+        }, [])
+      )
+    })
+    .catch(cb)
+}
+
+function clearPendingUpdatesList(cb) {
+  Promise.all(PENDING_UPDATES_LIST_KEYS.map(key => rclient.del(key)))
+    .then(() => cb(null))
+    .catch(cb)
+}
+
+describe('applyOtUpdate', function () {
+  before(function () {
+    return (this.update = {
+      op: [{ i: 'foo', p: 42 }],
+    })
+  })
+  describe('when authorized', function () {
+    before(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'readAndWrite',
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              { lines: this.lines, version: this.version, ops: this.ops },
+              (e, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            this.client = RealTimeClient.connect()
+            return this.client.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              cb
+            )
+          },
+
+          cb => {
+            return this.client.emit('joinDoc', this.doc_id, cb)
+          },
+
+          cb => {
+            return this.client.emit(
+              'applyOtUpdate',
+              this.doc_id,
+              this.update,
+              cb
+            )
+          },
+        ],
+        done
+      )
+    })
+
+    it('should push the doc into the pending updates list', function (done) {
+      getPendingUpdatesList((error, ...rest) => {
+        const [doc_id] = Array.from(rest[0])
+        doc_id.should.equal(`${this.project_id}:${this.doc_id}`)
+        return done()
+      })
+      return null
+    })
+
+    it('should push the update into redis', function (done) {
+      rclient.lrange(
+        redisSettings.documentupdater.key_schema.pendingUpdates({
+          doc_id: this.doc_id,
+        }),
+        0,
+        -1,
+        (error, ...rest) => {
+          let [update] = Array.from(rest[0])
+          update = JSON.parse(update)
+          update.op.should.deep.equal(this.update.op)
+          update.meta.should.deep.equal({
+            source: this.client.publicId,
+            user_id: this.user_id,
+          })
+          return done()
+        }
+      )
+      return null
+    })
+
+    return after(function (done) {
+      return async.series(
+        [
+          cb => clearPendingUpdatesList(cb),
+          cb =>
+            rclient.del(
+              'DocsWithPendingUpdates',
+              `${this.project_id}:${this.doc_id}`,
+              cb
+            ),
+          cb =>
+            rclient.del(
+              redisSettings.documentupdater.key_schema.pendingUpdates(
+                this.doc_id
+              ),
+              cb
+            ),
+        ],
+        done
+      )
+    })
+  })
+
+  describe('when authorized with a huge edit update', function () {
+    before(function (done) {
+      this.update = {
+        op: {
+          p: 12,
+          t: 'update is too large'.repeat(1024 * 400), // >7MB
+        },
+      }
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'readAndWrite',
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              { lines: this.lines, version: this.version, ops: this.ops },
+              (e, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            this.client = RealTimeClient.connect()
+            this.client.on('connectionAccepted', cb)
+            return this.client.on('otUpdateError', otUpdateError => {
+              this.otUpdateError = otUpdateError
+            })
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              cb
+            )
+          },
+
+          cb => {
+            return this.client.emit('joinDoc', this.doc_id, cb)
+          },
+
+          cb => {
+            return this.client.emit(
+              'applyOtUpdate',
+              this.doc_id,
+              this.update,
+              error => {
+                this.error = error
+                return cb()
+              }
+            )
+          },
+        ],
+        done
+      )
+    })
+
+    it('should not return an error', function () {
+      return expect(this.error).to.not.exist
+    })
+
+    it('should send an otUpdateError to the client', function (done) {
+      return setTimeout(() => {
+        expect(this.otUpdateError).to.exist
+        return done()
+      }, 300)
+    })
+
+    it('should disconnect the client', function (done) {
+      return setTimeout(() => {
+        this.client.socket.connected.should.equal(false)
+        return done()
+      }, 300)
+    })
+
+    return it('should not put the update in redis', function (done) {
+      rclient.llen(
+        redisSettings.documentupdater.key_schema.pendingUpdates({
+          doc_id: this.doc_id,
+        }),
+        (error, len) => {
+          len.should.equal(0)
+          return done()
+        }
+      )
+      return null
+    })
+  })
+
+  describe('when authorized to read-only with an edit update', function () {
+    before(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'readOnly',
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              { lines: this.lines, version: this.version, ops: this.ops },
+              (e, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            this.client = RealTimeClient.connect()
+            return this.client.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              cb
+            )
+          },
+
+          cb => {
+            return this.client.emit('joinDoc', this.doc_id, cb)
+          },
+
+          cb => {
+            return this.client.emit(
+              'applyOtUpdate',
+              this.doc_id,
+              this.update,
+              error => {
+                this.error = error
+                return cb()
+              }
+            )
+          },
+        ],
+        done
+      )
+    })
+
+    it('should return an error', function () {
+      return expect(this.error).to.exist
+    })
+
+    it('should disconnect the client', function (done) {
+      return setTimeout(() => {
+        this.client.socket.connected.should.equal(false)
+        return done()
+      }, 300)
+    })
+
+    return it('should not put the update in redis', function (done) {
+      rclient.llen(
+        redisSettings.documentupdater.key_schema.pendingUpdates({
+          doc_id: this.doc_id,
+        }),
+        (error, len) => {
+          len.should.equal(0)
+          return done()
+        }
+      )
+      return null
+    })
+  })
+
+  return describe('when authorized to read-only with a comment update', function () {
+    before(function (done) {
+      this.comment_update = {
+        op: [{ c: 'foo', p: 42 }],
+      }
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'readOnly',
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              { lines: this.lines, version: this.version, ops: this.ops },
+              (e, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            this.client = RealTimeClient.connect()
+            return this.client.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              cb
+            )
+          },
+
+          cb => {
+            return this.client.emit('joinDoc', this.doc_id, cb)
+          },
+
+          cb => {
+            return this.client.emit(
+              'applyOtUpdate',
+              this.doc_id,
+              this.comment_update,
+              cb
+            )
+          },
+        ],
+        done
+      )
+    })
+
+    it('should push the doc into the pending updates list', function (done) {
+      getPendingUpdatesList((error, ...rest) => {
+        const [doc_id] = Array.from(rest[0])
+        doc_id.should.equal(`${this.project_id}:${this.doc_id}`)
+        return done()
+      })
+      return null
+    })
+
+    it('should push the update into redis', function (done) {
+      rclient.lrange(
+        redisSettings.documentupdater.key_schema.pendingUpdates({
+          doc_id: this.doc_id,
+        }),
+        0,
+        -1,
+        (error, ...rest) => {
+          let [update] = Array.from(rest[0])
+          update = JSON.parse(update)
+          update.op.should.deep.equal(this.comment_update.op)
+          update.meta.should.deep.equal({
+            source: this.client.publicId,
+            user_id: this.user_id,
+          })
+          return done()
+        }
+      )
+      return null
+    })
+
+    return after(function (done) {
+      return async.series(
+        [
+          cb => clearPendingUpdatesList(cb),
+          cb =>
+            rclient.del(
+              'DocsWithPendingUpdates',
+              `${this.project_id}:${this.doc_id}`,
+              cb
+            ),
+          cb =>
+            rclient.del(
+              redisSettings.documentupdater.key_schema.pendingUpdates({
+                doc_id: this.doc_id,
+              }),
+              cb
+            ),
+        ],
+        done
+      )
+    })
+  })
+})

services/real-time/test/acceptance/js/ClientTrackingTests.js

@@ -0,0 +1,253 @@
+/* eslint-disable
+    camelcase,
+    handle-callback-err,
+    no-unused-vars,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS101: Remove unnecessary use of Array.from
+ * DS102: Remove unnecessary code created because of implicit returns
+ * DS207: Consider shorter variations of null checks
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const { expect } = require('chai')
+
+const RealTimeClient = require('./helpers/RealTimeClient')
+const MockWebServer = require('./helpers/MockWebServer')
+const FixturesManager = require('./helpers/FixturesManager')
+
+const async = require('async')
+
+describe('clientTracking', function () {
+  describe('when a client updates its cursor location', function () {
+    before(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'owner',
+                project: { name: 'Test Project' },
+              },
+              (error, { user_id, project_id }) => {
+                this.user_id = user_id
+                this.project_id = project_id
+                return cb()
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              { lines: this.lines, version: this.version, ops: this.ops },
+              (e, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            this.clientA = RealTimeClient.connect()
+            return this.clientA.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            this.clientB = RealTimeClient.connect()
+            return this.clientB.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            return this.clientA.emit(
+              'joinProject',
+              {
+                project_id: this.project_id,
+              },
+              cb
+            )
+          },
+
+          cb => {
+            return this.clientA.emit('joinDoc', this.doc_id, cb)
+          },
+
+          cb => {
+            return this.clientB.emit(
+              'joinProject',
+              {
+                project_id: this.project_id,
+              },
+              cb
+            )
+          },
+
+          cb => {
+            this.updates = []
+            this.clientB.on('clientTracking.clientUpdated', data => {
+              return this.updates.push(data)
+            })
+
+            return this.clientA.emit(
+              'clientTracking.updatePosition',
+              {
+                row: (this.row = 42),
+                column: (this.column = 36),
+                doc_id: this.doc_id,
+              },
+              error => {
+                if (error != null) {
+                  throw error
+                }
+                return setTimeout(cb, 300)
+              }
+            )
+          }, // Give the message a chance to reach client B.
+        ],
+        done
+      )
+    })
+
+    it('should tell other clients about the update', function () {
+      return this.updates.should.deep.equal([
+        {
+          row: this.row,
+          column: this.column,
+          doc_id: this.doc_id,
+          id: this.clientA.publicId,
+          user_id: this.user_id,
+          name: 'Joe Bloggs',
+        },
+      ])
+    })
+
+    return it('should record the update in getConnectedUsers', function (done) {
+      return this.clientB.emit(
+        'clientTracking.getConnectedUsers',
+        (error, users) => {
+          for (const user of Array.from(users)) {
+            if (user.client_id === this.clientA.publicId) {
+              expect(user.cursorData).to.deep.equal({
+                row: this.row,
+                column: this.column,
+                doc_id: this.doc_id,
+              })
+              return done()
+            }
+          }
+          throw new Error('user was never found')
+        }
+      )
+    })
+  })
+
+  return describe('when an anonymous client updates its cursor location', function () {
+    before(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'owner',
+                project: { name: 'Test Project' },
+                publicAccess: 'readAndWrite',
+              },
+              (error, { user_id, project_id }) => {
+                this.user_id = user_id
+                this.project_id = project_id
+                return cb()
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              { lines: this.lines, version: this.version, ops: this.ops },
+              (e, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            this.clientA = RealTimeClient.connect()
+            return this.clientA.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            return this.clientA.emit(
+              'joinProject',
+              {
+                project_id: this.project_id,
+              },
+              cb
+            )
+          },
+
+          cb => {
+            return RealTimeClient.setSession({}, cb)
+          },
+
+          cb => {
+            this.anonymous = RealTimeClient.connect()
+            return this.anonymous.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            return this.anonymous.emit(
+              'joinProject',
+              {
+                project_id: this.project_id,
+              },
+              cb
+            )
+          },
+
+          cb => {
+            return this.anonymous.emit('joinDoc', this.doc_id, cb)
+          },
+
+          cb => {
+            this.updates = []
+            this.clientA.on('clientTracking.clientUpdated', data => {
+              return this.updates.push(data)
+            })
+
+            return this.anonymous.emit(
+              'clientTracking.updatePosition',
+              {
+                row: (this.row = 42),
+                column: (this.column = 36),
+                doc_id: this.doc_id,
+              },
+              error => {
+                if (error != null) {
+                  throw error
+                }
+                return setTimeout(cb, 300)
+              }
+            )
+          }, // Give the message a chance to reach client B.
+        ],
+        done
+      )
+    })
+
+    return it('should tell other clients about the update', function () {
+      return this.updates.should.deep.equal([
+        {
+          row: this.row,
+          column: this.column,
+          doc_id: this.doc_id,
+          id: this.anonymous.publicId,
+          user_id: 'anonymous-user',
+          name: '',
+        },
+      ])
+    })
+  })
+})

services/real-time/test/acceptance/js/DrainManagerTests.js

@@ -0,0 +1,135 @@
+/* eslint-disable
+    camelcase,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const RealTimeClient = require('./helpers/RealTimeClient')
+const FixturesManager = require('./helpers/FixturesManager')
+
+const { expect } = require('chai')
+
+const async = require('async')
+const request = require('request')
+
+const Settings = require('@overleaf/settings')
+
+const drain = function (rate, callback) {
+  request.post(
+    {
+      url: `http://localhost:3026/drain?rate=${rate}`,
+      auth: {
+        user: Settings.internal.realTime.user,
+        pass: Settings.internal.realTime.pass,
+      },
+    },
+    (error, response, data) => callback(error, data)
+  )
+  return null
+}
+
+describe('DrainManagerTests', function () {
+  before(function (done) {
+    FixturesManager.setUpProject(
+      {
+        privilegeLevel: 'owner',
+        project: {
+          name: 'Test Project',
+        },
+      },
+      (e, { project_id, user_id }) => {
+        this.project_id = project_id
+        this.user_id = user_id
+        return done()
+      }
+    )
+    return null
+  })
+
+  before(function (done) {
+    // cleanup to speedup reconnecting
+    this.timeout(10000)
+    return RealTimeClient.disconnectAllClients(done)
+  })
+
+  // trigger and check cleanup
+  it('should have disconnected all previous clients', function (done) {
+    return RealTimeClient.getConnectedClients((error, data) => {
+      if (error) {
+        return done(error)
+      }
+      expect(data.length).to.equal(0)
+      return done()
+    })
+  })
+
+  return describe('with two clients in the project', function () {
+    beforeEach(function (done) {
+      return async.series(
+        [
+          cb => {
+            this.clientA = RealTimeClient.connect()
+            return this.clientA.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            this.clientB = RealTimeClient.connect()
+            return this.clientB.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            return this.clientA.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              cb
+            )
+          },
+
+          cb => {
+            return this.clientB.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              cb
+            )
+          },
+        ],
+        done
+      )
+    })
+
+    return describe('starting to drain', function () {
+      beforeEach(function (done) {
+        return async.parallel(
+          [
+            cb => {
+              return this.clientA.on('reconnectGracefully', cb)
+            },
+            cb => {
+              return this.clientB.on('reconnectGracefully', cb)
+            },
+
+            cb => drain(2, cb),
+          ],
+          done
+        )
+      })
+
+      afterEach(function (done) {
+        return drain(0, done)
+      }) // reset drain
+
+      it('should not timeout', function () {
+        return expect(true).to.equal(true)
+      })
+
+      return it('should not have disconnected', function () {
+        expect(this.clientA.socket.connected).to.equal(true)
+        return expect(this.clientB.socket.connected).to.equal(true)
+      })
+    })
+  })
+})

services/real-time/test/acceptance/js/EarlyDisconnect.js

@@ -0,0 +1,288 @@
+/* eslint-disable
+    camelcase,
+    no-return-assign,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS101: Remove unnecessary use of Array.from
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const async = require('async')
+const { expect } = require('chai')
+
+const RealTimeClient = require('./helpers/RealTimeClient')
+const MockDocUpdaterServer = require('./helpers/MockDocUpdaterServer')
+const MockWebServer = require('./helpers/MockWebServer')
+const FixturesManager = require('./helpers/FixturesManager')
+
+const settings = require('@overleaf/settings')
+const redis = require('@overleaf/redis-wrapper')
+const rclient = redis.createClient(settings.redis.pubsub)
+const rclientRT = redis.createClient(settings.redis.realtime)
+const KeysRT = settings.redis.realtime.key_schema
+
+describe('EarlyDisconnect', function () {
+  before(function (done) {
+    return MockDocUpdaterServer.run(done)
+  })
+
+  describe('when the client disconnects before joinProject completes', function () {
+    before(function () {
+      // slow down web-api requests to force the race condition
+      let joinProject
+      this.actualWebAPIjoinProject = joinProject = MockWebServer.joinProject
+      return (MockWebServer.joinProject = (project_id, user_id, cb) =>
+        setTimeout(() => joinProject(project_id, user_id, cb), 300))
+    })
+
+    after(function () {
+      return (MockWebServer.joinProject = this.actualWebAPIjoinProject)
+    })
+
+    beforeEach(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'owner',
+                project: {
+                  name: 'Test Project',
+                },
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb()
+              }
+            )
+          },
+
+          cb => {
+            this.clientA = RealTimeClient.connect()
+            return this.clientA.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            this.clientA.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              () => {}
+            )
+            // disconnect before joinProject completes
+            this.clientA.on('disconnect', () => cb())
+            return this.clientA.disconnect()
+          },
+
+          cb => {
+            // wait for joinDoc and subscribe
+            return setTimeout(cb, 500)
+          },
+        ],
+        done
+      )
+    })
+
+    // we can force the race condition, there is no need to repeat too often
+    return Array.from(Array.from({ length: 5 }).map((_, i) => i + 1)).map(
+      attempt =>
+        it(`should not subscribe to the pub/sub channel anymore (race ${attempt})`, function (done) {
+          rclient.pubsub('CHANNELS', (err, resp) => {
+            if (err) {
+              return done(err)
+            }
+            expect(resp).to.not.include(`editor-events:${this.project_id}`)
+            return done()
+          })
+          return null
+        })
+    )
+  })
+
+  describe('when the client disconnects before joinDoc completes', function () {
+    beforeEach(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'owner',
+                project: {
+                  name: 'Test Project',
+                },
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb()
+              }
+            )
+          },
+
+          cb => {
+            this.clientA = RealTimeClient.connect()
+            return this.clientA.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            return this.clientA.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              (error, project, privilegeLevel, protocolVersion) => {
+                this.project = project
+                this.privilegeLevel = privilegeLevel
+                this.protocolVersion = protocolVersion
+                return cb(error)
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              { lines: this.lines, version: this.version, ops: this.ops },
+              (e, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            this.clientA.emit('joinDoc', this.doc_id, () => {})
+            // disconnect before joinDoc completes
+            this.clientA.on('disconnect', () => cb())
+            return this.clientA.disconnect()
+          },
+
+          cb => {
+            // wait for subscribe and unsubscribe
+            return setTimeout(cb, 100)
+          },
+        ],
+        done
+      )
+    })
+
+    // we can not force the race condition, so we have to try many times
+    return Array.from(Array.from({ length: 20 }).map((_, i) => i + 1)).map(
+      attempt =>
+        it(`should not subscribe to the pub/sub channels anymore (race ${attempt})`, function (done) {
+          rclient.pubsub('CHANNELS', (err, resp) => {
+            if (err) {
+              return done(err)
+            }
+            expect(resp).to.not.include(`editor-events:${this.project_id}`)
+
+            return rclient.pubsub('CHANNELS', (err, resp) => {
+              if (err) {
+                return done(err)
+              }
+              expect(resp).to.not.include(`applied-ops:${this.doc_id}`)
+              return done()
+            })
+          })
+          return null
+        })
+    )
+  })
+
+  return describe('when the client disconnects before clientTracking.updatePosition starts', function () {
+    beforeEach(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'owner',
+                project: {
+                  name: 'Test Project',
+                },
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb()
+              }
+            )
+          },
+
+          cb => {
+            this.clientA = RealTimeClient.connect()
+            return this.clientA.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            return this.clientA.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              (error, project, privilegeLevel, protocolVersion) => {
+                this.project = project
+                this.privilegeLevel = privilegeLevel
+                this.protocolVersion = protocolVersion
+                return cb(error)
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              { lines: this.lines, version: this.version, ops: this.ops },
+              (e, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            return this.clientA.emit('joinDoc', this.doc_id, cb)
+          },
+
+          cb => {
+            this.clientA.emit(
+              'clientTracking.updatePosition',
+              {
+                row: 42,
+                column: 36,
+                doc_id: this.doc_id,
+              },
+              () => {}
+            )
+            // disconnect before updateClientPosition completes
+            this.clientA.on('disconnect', () => cb())
+            return this.clientA.disconnect()
+          },
+
+          cb => {
+            // wait for updateClientPosition
+            return setTimeout(cb, 100)
+          },
+        ],
+        done
+      )
+    })
+
+    // we can not force the race condition, so we have to try many times
+    return Array.from(Array.from({ length: 20 }).map((_, i) => i + 1)).map(
+      attempt =>
+        it(`should not show the client as connected (race ${attempt})`, function (done) {
+          rclientRT.smembers(
+            KeysRT.clientsInProject({ project_id: this.project_id }),
+            (err, results) => {
+              if (err) {
+                return done(err)
+              }
+              expect(results).to.deep.equal([])
+              return done()
+            }
+          )
+          return null
+        })
+    )
+  })
+})

services/real-time/test/acceptance/js/HttpControllerTests.js

@@ -0,0 +1,117 @@
+/* eslint-disable
+    camelcase,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const async = require('async')
+const { expect } = require('chai')
+const request = require('request').defaults({
+  baseUrl: 'http://localhost:3026',
+})
+
+const RealTimeClient = require('./helpers/RealTimeClient')
+const FixturesManager = require('./helpers/FixturesManager')
+
+describe('HttpControllerTests', function () {
+  describe('without a user', function () {
+    return it('should return 404 for the client view', function (done) {
+      const client_id = 'not-existing'
+      return request.get(
+        {
+          url: `/clients/${client_id}`,
+          json: true,
+        },
+        (error, response, data) => {
+          if (error) {
+            return done(error)
+          }
+          expect(response.statusCode).to.equal(404)
+          return done()
+        }
+      )
+    })
+  })
+
+  return describe('with a user and after joining a project', function () {
+    before(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'owner',
+              },
+              (error, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb(error)
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              {},
+              (error, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(error)
+              }
+            )
+          },
+
+          cb => {
+            this.client = RealTimeClient.connect()
+            return this.client.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              cb
+            )
+          },
+
+          cb => {
+            return this.client.emit('joinDoc', this.doc_id, cb)
+          },
+        ],
+        done
+      )
+    })
+
+    return it('should send a client view', function (done) {
+      return request.get(
+        {
+          url: `/clients/${this.client.socket.sessionid}`,
+          json: true,
+        },
+        (error, response, data) => {
+          if (error) {
+            return done(error)
+          }
+          expect(response.statusCode).to.equal(200)
+          expect(data.connected_time).to.exist
+          delete data.connected_time
+          // .email is not set in the session
+          delete data.email
+          expect(data).to.deep.equal({
+            client_id: this.client.socket.sessionid,
+            first_name: 'Joe',
+            last_name: 'Bloggs',
+            project_id: this.project_id,
+            user_id: this.user_id,
+            rooms: [this.project_id, this.doc_id],
+          })
+          return done()
+        }
+      )
+    })
+  })
+})

services/real-time/test/acceptance/js/JoinDocTests.js

@@ -0,0 +1,563 @@
+/* eslint-disable
+    camelcase,
+    handle-callback-err,
+    no-return-assign,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS101: Remove unnecessary use of Array.from
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const { expect } = require('chai')
+
+const RealTimeClient = require('./helpers/RealTimeClient')
+const MockDocUpdaterServer = require('./helpers/MockDocUpdaterServer')
+const FixturesManager = require('./helpers/FixturesManager')
+
+const async = require('async')
+
+describe('joinDoc', function () {
+  before(function () {
+    this.lines = ['test', 'doc', 'lines']
+    this.version = 42
+    this.ops = ['mock', 'doc', 'ops']
+    return (this.ranges = { mock: 'ranges' })
+  })
+
+  describe('when authorised readAndWrite', function () {
+    before(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'readAndWrite',
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              {
+                lines: this.lines,
+                version: this.version,
+                ops: this.ops,
+                ranges: this.ranges,
+              },
+              (e, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            this.client = RealTimeClient.connect()
+            return this.client.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              cb
+            )
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinDoc',
+              this.doc_id,
+              (error, ...rest) => {
+                ;[...this.returnedArgs] = Array.from(rest)
+                return cb(error)
+              }
+            )
+          },
+        ],
+        done
+      )
+    })
+
+    it('should get the doc from the doc updater', function () {
+      return MockDocUpdaterServer.getDocument
+        .calledWith(this.project_id, this.doc_id, -1)
+        .should.equal(true)
+    })
+
+    it('should return the doc lines, version, ranges and ops', function () {
+      return this.returnedArgs.should.deep.equal([
+        this.lines,
+        this.version,
+        this.ops,
+        this.ranges,
+      ])
+    })
+
+    return it('should have joined the doc room', function (done) {
+      return RealTimeClient.getConnectedClient(
+        this.client.socket.sessionid,
+        (error, client) => {
+          expect(Array.from(client.rooms).includes(this.doc_id)).to.equal(true)
+          return done()
+        }
+      )
+    })
+  })
+
+  describe('when authorised readOnly', function () {
+    before(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'readOnly',
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              {
+                lines: this.lines,
+                version: this.version,
+                ops: this.ops,
+                ranges: this.ranges,
+              },
+              (e, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            this.client = RealTimeClient.connect()
+            return this.client.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              cb
+            )
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinDoc',
+              this.doc_id,
+              (error, ...rest) => {
+                ;[...this.returnedArgs] = Array.from(rest)
+                return cb(error)
+              }
+            )
+          },
+        ],
+        done
+      )
+    })
+
+    it('should get the doc from the doc updater', function () {
+      return MockDocUpdaterServer.getDocument
+        .calledWith(this.project_id, this.doc_id, -1)
+        .should.equal(true)
+    })
+
+    it('should return the doc lines, version, ranges and ops', function () {
+      return this.returnedArgs.should.deep.equal([
+        this.lines,
+        this.version,
+        this.ops,
+        this.ranges,
+      ])
+    })
+
+    return it('should have joined the doc room', function (done) {
+      return RealTimeClient.getConnectedClient(
+        this.client.socket.sessionid,
+        (error, client) => {
+          expect(Array.from(client.rooms).includes(this.doc_id)).to.equal(true)
+          return done()
+        }
+      )
+    })
+  })
+
+  describe('when authorised as owner', function () {
+    before(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'owner',
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              {
+                lines: this.lines,
+                version: this.version,
+                ops: this.ops,
+                ranges: this.ranges,
+              },
+              (e, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            this.client = RealTimeClient.connect()
+            return this.client.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              cb
+            )
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinDoc',
+              this.doc_id,
+              (error, ...rest) => {
+                ;[...this.returnedArgs] = Array.from(rest)
+                return cb(error)
+              }
+            )
+          },
+        ],
+        done
+      )
+    })
+
+    it('should get the doc from the doc updater', function () {
+      return MockDocUpdaterServer.getDocument
+        .calledWith(this.project_id, this.doc_id, -1)
+        .should.equal(true)
+    })
+
+    it('should return the doc lines, version, ranges and ops', function () {
+      return this.returnedArgs.should.deep.equal([
+        this.lines,
+        this.version,
+        this.ops,
+        this.ranges,
+      ])
+    })
+
+    return it('should have joined the doc room', function (done) {
+      return RealTimeClient.getConnectedClient(
+        this.client.socket.sessionid,
+        (error, client) => {
+          expect(Array.from(client.rooms).includes(this.doc_id)).to.equal(true)
+          return done()
+        }
+      )
+    })
+  })
+
+  // It is impossible to write an acceptance test to test joining an unauthorized
+  // project, since joinProject already catches that. If you can join a project,
+  // then you can join a doc in that project.
+
+  describe('with a fromVersion', function () {
+    before(function (done) {
+      this.fromVersion = 36
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'readAndWrite',
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              {
+                lines: this.lines,
+                version: this.version,
+                ops: this.ops,
+                ranges: this.ranges,
+              },
+              (e, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            this.client = RealTimeClient.connect()
+            return this.client.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              cb
+            )
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinDoc',
+              this.doc_id,
+              this.fromVersion,
+              (error, ...rest) => {
+                ;[...this.returnedArgs] = Array.from(rest)
+                return cb(error)
+              }
+            )
+          },
+        ],
+        done
+      )
+    })
+
+    it('should get the doc from the doc updater with the fromVersion', function () {
+      return MockDocUpdaterServer.getDocument
+        .calledWith(this.project_id, this.doc_id, this.fromVersion)
+        .should.equal(true)
+    })
+
+    it('should return the doc lines, version, ranges and ops', function () {
+      return this.returnedArgs.should.deep.equal([
+        this.lines,
+        this.version,
+        this.ops,
+        this.ranges,
+      ])
+    })
+
+    return it('should have joined the doc room', function (done) {
+      return RealTimeClient.getConnectedClient(
+        this.client.socket.sessionid,
+        (error, client) => {
+          expect(Array.from(client.rooms).includes(this.doc_id)).to.equal(true)
+          return done()
+        }
+      )
+    })
+  })
+
+  describe('with options', function () {
+    before(function (done) {
+      this.options = { encodeRanges: true }
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'readAndWrite',
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              {
+                lines: this.lines,
+                version: this.version,
+                ops: this.ops,
+                ranges: this.ranges,
+              },
+              (e, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            this.client = RealTimeClient.connect()
+            return this.client.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              cb
+            )
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinDoc',
+              this.doc_id,
+              this.options,
+              (error, ...rest) => {
+                ;[...this.returnedArgs] = Array.from(rest)
+                return cb(error)
+              }
+            )
+          },
+        ],
+        done
+      )
+    })
+
+    it('should get the doc from the doc updater with the default fromVersion', function () {
+      return MockDocUpdaterServer.getDocument
+        .calledWith(this.project_id, this.doc_id, -1)
+        .should.equal(true)
+    })
+
+    it('should return the doc lines, version, ranges and ops', function () {
+      return this.returnedArgs.should.deep.equal([
+        this.lines,
+        this.version,
+        this.ops,
+        this.ranges,
+      ])
+    })
+
+    return it('should have joined the doc room', function (done) {
+      return RealTimeClient.getConnectedClient(
+        this.client.socket.sessionid,
+        (error, client) => {
+          expect(Array.from(client.rooms).includes(this.doc_id)).to.equal(true)
+          return done()
+        }
+      )
+    })
+  })
+
+  return describe('with fromVersion and options', function () {
+    before(function (done) {
+      this.fromVersion = 36
+      this.options = { encodeRanges: true }
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'readAndWrite',
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              {
+                lines: this.lines,
+                version: this.version,
+                ops: this.ops,
+                ranges: this.ranges,
+              },
+              (e, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            this.client = RealTimeClient.connect()
+            return this.client.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              cb
+            )
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinDoc',
+              this.doc_id,
+              this.fromVersion,
+              this.options,
+              (error, ...rest) => {
+                ;[...this.returnedArgs] = Array.from(rest)
+                return cb(error)
+              }
+            )
+          },
+        ],
+        done
+      )
+    })
+
+    it('should get the doc from the doc updater with the fromVersion', function () {
+      return MockDocUpdaterServer.getDocument
+        .calledWith(this.project_id, this.doc_id, this.fromVersion)
+        .should.equal(true)
+    })
+
+    it('should return the doc lines, version, ranges and ops', function () {
+      return this.returnedArgs.should.deep.equal([
+        this.lines,
+        this.version,
+        this.ops,
+        this.ranges,
+      ])
+    })
+
+    return it('should have joined the doc room', function (done) {
+      return RealTimeClient.getConnectedClient(
+        this.client.socket.sessionid,
+        (error, client) => {
+          expect(Array.from(client.rooms).includes(this.doc_id)).to.equal(true)
+          return done()
+        }
+      )
+    })
+  })
+})

services/real-time/test/acceptance/js/JoinProjectTests.js

@@ -0,0 +1,328 @@
+/* eslint-disable
+    camelcase,
+    handle-callback-err,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS101: Remove unnecessary use of Array.from
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const { expect } = require('chai')
+
+const RealTimeClient = require('./helpers/RealTimeClient')
+const MockWebServer = require('./helpers/MockWebServer')
+const FixturesManager = require('./helpers/FixturesManager')
+
+const async = require('async')
+
+describe('joinProject', function () {
+  describe('when authorized', function () {
+    before(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'owner',
+                project: {
+                  name: 'Test Project',
+                },
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            this.client = RealTimeClient.connect()
+            return this.client.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              (error, project, privilegeLevel, protocolVersion) => {
+                this.project = project
+                this.privilegeLevel = privilegeLevel
+                this.protocolVersion = protocolVersion
+                return cb(error)
+              }
+            )
+          },
+        ],
+        done
+      )
+    })
+
+    it('should get the project from web', function () {
+      return MockWebServer.joinProject
+        .calledWith(this.project_id, this.user_id)
+        .should.equal(true)
+    })
+
+    it('should return the project', function () {
+      return this.project.should.deep.equal({
+        name: 'Test Project',
+      })
+    })
+
+    it('should return the privilege level', function () {
+      return this.privilegeLevel.should.equal('owner')
+    })
+
+    it('should return the protocolVersion', function () {
+      return this.protocolVersion.should.equal(2)
+    })
+
+    it('should have joined the project room', function (done) {
+      return RealTimeClient.getConnectedClient(
+        this.client.socket.sessionid,
+        (error, client) => {
+          expect(Array.from(client.rooms).includes(this.project_id)).to.equal(
+            true
+          )
+          return done()
+        }
+      )
+    })
+
+    return it('should have marked the user as connected', function (done) {
+      return this.client.emit(
+        'clientTracking.getConnectedUsers',
+        (error, users) => {
+          let connected = false
+          for (const user of Array.from(users)) {
+            if (
+              user.client_id === this.client.publicId &&
+              user.user_id === this.user_id
+            ) {
+              connected = true
+              break
+            }
+          }
+          expect(connected).to.equal(true)
+          return done()
+        }
+      )
+    })
+  })
+
+  describe('when not authorized', function () {
+    before(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: null,
+                project: {
+                  name: 'Test Project',
+                },
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            this.client = RealTimeClient.connect()
+            return this.client.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              (error, project, privilegeLevel, protocolVersion) => {
+                this.error = error
+                this.project = project
+                this.privilegeLevel = privilegeLevel
+                this.protocolVersion = protocolVersion
+                return cb()
+              }
+            )
+          },
+        ],
+        done
+      )
+    })
+
+    it('should return an error', function () {
+      return this.error.message.should.equal('not authorized')
+    })
+
+    return it('should not have joined the project room', function (done) {
+      return RealTimeClient.getConnectedClient(
+        this.client.socket.sessionid,
+        (error, client) => {
+          expect(Array.from(client.rooms).includes(this.project_id)).to.equal(
+            false
+          )
+          return done()
+        }
+      )
+    })
+  })
+
+  describe('when not authorized and web replies with a 403', function () {
+    before(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                project_id: 'forbidden',
+                privilegeLevel: 'owner',
+                project: {
+                  name: 'Test Project',
+                },
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                cb(e)
+              }
+            )
+          },
+
+          cb => {
+            this.client = RealTimeClient.connect()
+            this.client.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            this.client.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              (error, project, privilegeLevel, protocolVersion) => {
+                this.error = error
+                this.project = project
+                this.privilegeLevel = privilegeLevel
+                this.protocolVersion = protocolVersion
+                cb()
+              }
+            )
+          },
+        ],
+        done
+      )
+    })
+
+    it('should return an error', function () {
+      this.error.message.should.equal('not authorized')
+    })
+
+    it('should not have joined the project room', function (done) {
+      RealTimeClient.getConnectedClient(
+        this.client.socket.sessionid,
+        (error, client) => {
+          expect(Array.from(client.rooms).includes(this.project_id)).to.equal(
+            false
+          )
+          done()
+        }
+      )
+    })
+  })
+
+  describe('when deleted and web replies with a 404', function () {
+    before(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                project_id: 'not-found',
+                privilegeLevel: 'owner',
+                project: {
+                  name: 'Test Project',
+                },
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                cb(e)
+              }
+            )
+          },
+
+          cb => {
+            this.client = RealTimeClient.connect()
+            this.client.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            this.client.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              (error, project, privilegeLevel, protocolVersion) => {
+                this.error = error
+                this.project = project
+                this.privilegeLevel = privilegeLevel
+                this.protocolVersion = protocolVersion
+                cb()
+              }
+            )
+          },
+        ],
+        done
+      )
+    })
+
+    it('should return an error', function () {
+      this.error.code.should.equal('ProjectNotFound')
+    })
+
+    it('should not have joined the project room', function (done) {
+      RealTimeClient.getConnectedClient(
+        this.client.socket.sessionid,
+        (error, client) => {
+          expect(Array.from(client.rooms).includes(this.project_id)).to.equal(
+            false
+          )
+          done()
+        }
+      )
+    })
+  })
+
+  return describe('when over rate limit', function () {
+    before(function (done) {
+      return async.series(
+        [
+          cb => {
+            this.client = RealTimeClient.connect()
+            return this.client.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinProject',
+              { project_id: 'rate-limited' },
+              error => {
+                this.error = error
+                return cb()
+              }
+            )
+          },
+        ],
+        done
+      )
+    })
+
+    return it('should return a TooManyRequests error code', function () {
+      this.error.message.should.equal('rate-limit hit when joining project')
+      return this.error.code.should.equal('TooManyRequests')
+    })
+  })
+})

services/real-time/test/acceptance/js/LeaveDocTests.js

@@ -0,0 +1,174 @@
+/* eslint-disable
+    camelcase,
+    handle-callback-err,
+    no-return-assign,
+    no-unused-vars,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS101: Remove unnecessary use of Array.from
+ * DS102: Remove unnecessary code created because of implicit returns
+ * DS207: Consider shorter variations of null checks
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const { expect } = require('chai')
+const sinon = require('sinon')
+
+const RealTimeClient = require('./helpers/RealTimeClient')
+const MockDocUpdaterServer = require('./helpers/MockDocUpdaterServer')
+const FixturesManager = require('./helpers/FixturesManager')
+const logger = require('logger-sharelatex')
+
+const async = require('async')
+
+describe('leaveDoc', function () {
+  before(function () {
+    this.lines = ['test', 'doc', 'lines']
+    this.version = 42
+    this.ops = ['mock', 'doc', 'ops']
+    sinon.spy(logger, 'error')
+    sinon.spy(logger, 'warn')
+    sinon.spy(logger, 'log')
+    return (this.other_doc_id = FixturesManager.getRandomId())
+  })
+
+  after(function () {
+    logger.error.restore() // remove the spy
+    logger.warn.restore()
+    return logger.log.restore()
+  })
+
+  return describe('when joined to a doc', function () {
+    beforeEach(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'readAndWrite',
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              { lines: this.lines, version: this.version, ops: this.ops },
+              (e, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            this.client = RealTimeClient.connect()
+            return this.client.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              cb
+            )
+          },
+
+          cb => {
+            return this.client.emit(
+              'joinDoc',
+              this.doc_id,
+              (error, ...rest) => {
+                ;[...this.returnedArgs] = Array.from(rest)
+                return cb(error)
+              }
+            )
+          },
+        ],
+        done
+      )
+    })
+
+    describe('then leaving the doc', function () {
+      beforeEach(function (done) {
+        return this.client.emit('leaveDoc', this.doc_id, error => {
+          if (error != null) {
+            throw error
+          }
+          return done()
+        })
+      })
+
+      return it('should have left the doc room', function (done) {
+        return RealTimeClient.getConnectedClient(
+          this.client.socket.sessionid,
+          (error, client) => {
+            expect(Array.from(client.rooms).includes(this.doc_id)).to.equal(
+              false
+            )
+            return done()
+          }
+        )
+      })
+    })
+
+    describe('when sending a leaveDoc request before the previous joinDoc request has completed', function () {
+      beforeEach(function (done) {
+        this.client.emit('leaveDoc', this.doc_id, () => {})
+        this.client.emit('joinDoc', this.doc_id, () => {})
+        return this.client.emit('leaveDoc', this.doc_id, error => {
+          if (error != null) {
+            throw error
+          }
+          return done()
+        })
+      })
+
+      it('should not trigger an error', function () {
+        return sinon.assert.neverCalledWith(
+          logger.error,
+          sinon.match.any,
+          "not subscribed - shouldn't happen"
+        )
+      })
+
+      return it('should have left the doc room', function (done) {
+        return RealTimeClient.getConnectedClient(
+          this.client.socket.sessionid,
+          (error, client) => {
+            expect(Array.from(client.rooms).includes(this.doc_id)).to.equal(
+              false
+            )
+            return done()
+          }
+        )
+      })
+    })
+
+    return describe('when sending a leaveDoc for a room the client has not joined ', function () {
+      beforeEach(function (done) {
+        return this.client.emit('leaveDoc', this.other_doc_id, error => {
+          if (error != null) {
+            throw error
+          }
+          return done()
+        })
+      })
+
+      return it('should trigger a low level message only', function () {
+        return sinon.assert.calledWith(
+          logger.log,
+          sinon.match.any,
+          'ignoring request from client to leave room it is not in'
+        )
+      })
+    })
+  })
+})

services/real-time/test/acceptance/js/LeaveProjectTests.js

@@ -0,0 +1,270 @@
+/* eslint-disable
+    camelcase,
+    handle-callback-err,
+    no-throw-literal,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS101: Remove unnecessary use of Array.from
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const RealTimeClient = require('./helpers/RealTimeClient')
+const MockDocUpdaterServer = require('./helpers/MockDocUpdaterServer')
+const FixturesManager = require('./helpers/FixturesManager')
+
+const async = require('async')
+
+const settings = require('@overleaf/settings')
+const redis = require('@overleaf/redis-wrapper')
+const rclient = redis.createClient(settings.redis.pubsub)
+
+describe('leaveProject', function () {
+  before(function (done) {
+    return MockDocUpdaterServer.run(done)
+  })
+
+  describe('with other clients in the project', function () {
+    before(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'owner',
+                project: {
+                  name: 'Test Project',
+                },
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb()
+              }
+            )
+          },
+
+          cb => {
+            this.clientA = RealTimeClient.connect()
+            return this.clientA.on('connectionAccepted', cb)
+          },
+
+          cb => {
+            this.clientB = RealTimeClient.connect()
+            this.clientB.on('connectionAccepted', cb)
+
+            this.clientBDisconnectMessages = []
+            return this.clientB.on(
+              'clientTracking.clientDisconnected',
+              data => {
+                return this.clientBDisconnectMessages.push(data)
+              }
+            )
+          },
+
+          cb => {
+            return this.clientA.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              (error, project, privilegeLevel, protocolVersion) => {
+                this.project = project
+                this.privilegeLevel = privilegeLevel
+                this.protocolVersion = protocolVersion
+                return cb(error)
+              }
+            )
+          },
+
+          cb => {
+            return this.clientB.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              (error, project, privilegeLevel, protocolVersion) => {
+                this.project = project
+                this.privilegeLevel = privilegeLevel
+                this.protocolVersion = protocolVersion
+                return cb(error)
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              { lines: this.lines, version: this.version, ops: this.ops },
+              (e, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            return this.clientA.emit('joinDoc', this.doc_id, cb)
+          },
+          cb => {
+            return this.clientB.emit('joinDoc', this.doc_id, cb)
+          },
+
+          cb => {
+            // leaveProject is called when the client disconnects
+            this.clientA.on('disconnect', () => cb())
+            return this.clientA.disconnect()
+          },
+
+          cb => {
+            // The API waits a little while before flushing changes
+            return setTimeout(done, 1000)
+          },
+        ],
+        done
+      )
+    })
+
+    it('should emit a disconnect message to the room', function () {
+      return this.clientBDisconnectMessages.should.deep.equal([
+        this.clientA.publicId,
+      ])
+    })
+
+    it('should no longer list the client in connected users', function (done) {
+      return this.clientB.emit(
+        'clientTracking.getConnectedUsers',
+        (error, users) => {
+          for (const user of Array.from(users)) {
+            if (user.client_id === this.clientA.publicId) {
+              throw 'Expected clientA to not be listed in connected users'
+            }
+          }
+          return done()
+        }
+      )
+    })
+
+    it('should not flush the project to the document updater', function () {
+      return MockDocUpdaterServer.deleteProject
+        .calledWith(this.project_id)
+        .should.equal(false)
+    })
+
+    it('should remain subscribed to the editor-events channels', function (done) {
+      rclient.pubsub('CHANNELS', (err, resp) => {
+        if (err) {
+          return done(err)
+        }
+        resp.should.include(`editor-events:${this.project_id}`)
+        return done()
+      })
+      return null
+    })
+
+    return it('should remain subscribed to the applied-ops channels', function (done) {
+      rclient.pubsub('CHANNELS', (err, resp) => {
+        if (err) {
+          return done(err)
+        }
+        resp.should.include(`applied-ops:${this.doc_id}`)
+        return done()
+      })
+      return null
+    })
+  })
+
+  return describe('with no other clients in the project', function () {
+    before(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'owner',
+                project: {
+                  name: 'Test Project',
+                },
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb()
+              }
+            )
+          },
+
+          cb => {
+            this.clientA = RealTimeClient.connect()
+            return this.clientA.on('connect', cb)
+          },
+
+          cb => {
+            return this.clientA.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              (error, project, privilegeLevel, protocolVersion) => {
+                this.project = project
+                this.privilegeLevel = privilegeLevel
+                this.protocolVersion = protocolVersion
+                return cb(error)
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              { lines: this.lines, version: this.version, ops: this.ops },
+              (e, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(e)
+              }
+            )
+          },
+          cb => {
+            return this.clientA.emit('joinDoc', this.doc_id, cb)
+          },
+
+          cb => {
+            // leaveProject is called when the client disconnects
+            this.clientA.on('disconnect', () => cb())
+            return this.clientA.disconnect()
+          },
+
+          cb => {
+            // The API waits a little while before flushing changes
+            return setTimeout(done, 1000)
+          },
+        ],
+        done
+      )
+    })
+
+    it('should flush the project to the document updater', function () {
+      return MockDocUpdaterServer.deleteProject
+        .calledWith(this.project_id)
+        .should.equal(true)
+    })
+
+    it('should not subscribe to the editor-events channels anymore', function (done) {
+      rclient.pubsub('CHANNELS', (err, resp) => {
+        if (err) {
+          return done(err)
+        }
+        resp.should.not.include(`editor-events:${this.project_id}`)
+        return done()
+      })
+      return null
+    })
+
+    return it('should not subscribe to the applied-ops channels anymore', function (done) {
+      rclient.pubsub('CHANNELS', (err, resp) => {
+        if (err) {
+          return done(err)
+        }
+        resp.should.not.include(`applied-ops:${this.doc_id}`)
+        return done()
+      })
+      return null
+    })
+  })
+})

services/real-time/test/acceptance/js/MatrixTests.js

@@ -0,0 +1,477 @@
+/*
+This test suite is a multi level matrix which allows us to test many cases
+ with all kinds of setups.
+
+Users/Actors are defined in USERS and are a low level entity that does connect
+ to a real-time pod. A typical UserItem is:
+
+  someDescriptiveNameForTheTestSuite: {
+    setup(cb) {
+      // <setup session here>
+      const options = { client: RealTimeClient.connect(), foo: 'bar' }
+      cb(null, options)
+    }
+  }
+
+Sessions are a set of actions that a User performs in the life-cycle of a
+ real-time session, before they try something weird. A typical SessionItem is:
+
+  someOtherDescriptiveNameForTheTestSuite: {
+    getActions(cb) {
+      cb(null, [
+        { rpc: 'RPC_ENDPOINT', args: [...] }
+      ])
+    }
+  }
+
+Finally there are InvalidRequests which are the weird actions I hinted on in
+ the Sessions section. The defined actions may be marked as 'failed' to denote
+ that real-time rejects them with an (for this test) expected error.
+ A typical InvalidRequestItem is:
+
+  joinOwnProject: {
+    getActions(cb) {
+      cb(null, [
+        { rpc: 'RPC_ENDPOINT', args: [...], failed: true }
+      ])
+    }
+  }
+
+There is additional meta-data that UserItems and SessionItems may use to skip
+ certain areas of the matrix. Theses are:
+
+- Has the User an own project that they join as part of the Session?
+  UserItem: { hasOwnProject: true, setup(cb) { cb(null, { project_id, ... }) }}
+  SessionItem: { needsOwnProject: true }
+ */
+/* eslint-disable
+    camelcase,
+*/
+const { expect } = require('chai')
+const async = require('async')
+
+const RealTimeClient = require('./helpers/RealTimeClient')
+const FixturesManager = require('./helpers/FixturesManager')
+
+const settings = require('@overleaf/settings')
+const Keys = settings.redis.documentupdater.key_schema
+const redis = require('@overleaf/redis-wrapper')
+const rclient = redis.createClient(settings.redis.pubsub)
+
+function getPendingUpdates(doc_id, cb) {
+  rclient.lrange(Keys.pendingUpdates({ doc_id }), 0, 10, cb)
+}
+function cleanupPreviousUpdates(doc_id, cb) {
+  rclient.del(Keys.pendingUpdates({ doc_id }), cb)
+}
+
+describe('MatrixTests', function () {
+  let privateProjectId, privateDocId, readWriteProjectId, readWriteDocId
+
+  let privateClient
+  before(function setupPrivateProject(done) {
+    FixturesManager.setUpEditorSession(
+      { privilegeLevel: 'owner' },
+      (err, { project_id, doc_id }) => {
+        if (err) return done(err)
+        privateProjectId = project_id
+        privateDocId = doc_id
+        privateClient = RealTimeClient.connect()
+        privateClient.on('connectionAccepted', () => {
+          privateClient.emit(
+            'joinProject',
+            { project_id: privateProjectId },
+            err => {
+              if (err) return done(err)
+              privateClient.emit('joinDoc', privateDocId, done)
+            }
+          )
+        })
+      }
+    )
+  })
+
+  before(function setupReadWriteProject(done) {
+    FixturesManager.setUpEditorSession(
+      {
+        publicAccess: 'readAndWrite',
+      },
+      (err, { project_id, doc_id }) => {
+        readWriteProjectId = project_id
+        readWriteDocId = doc_id
+        done(err)
+      }
+    )
+  })
+
+  const USER_SETUP = {
+    anonymous: {
+      setup(cb) {
+        RealTimeClient.setSession({}, err => {
+          if (err) return cb(err)
+          cb(null, {
+            client: RealTimeClient.connect(),
+          })
+        })
+      },
+    },
+
+    registered: {
+      setup(cb) {
+        const user_id = FixturesManager.getRandomId()
+        RealTimeClient.setSession(
+          {
+            user: {
+              _id: user_id,
+              first_name: 'Joe',
+              last_name: 'Bloggs',
+            },
+          },
+          err => {
+            if (err) return cb(err)
+            cb(null, {
+              user_id,
+              client: RealTimeClient.connect(),
+            })
+          }
+        )
+      },
+    },
+
+    registeredWithOwnedProject: {
+      setup(cb) {
+        FixturesManager.setUpEditorSession(
+          { privilegeLevel: 'owner' },
+          (err, { project_id, user_id, doc_id }) => {
+            if (err) return cb(err)
+            cb(null, {
+              user_id,
+              project_id,
+              doc_id,
+              client: RealTimeClient.connect(),
+            })
+          }
+        )
+      },
+      hasOwnProject: true,
+    },
+  }
+
+  Object.entries(USER_SETUP).forEach(level0 => {
+    const [userDescription, userItem] = level0
+    let options, client
+
+    const SESSION_SETUP = {
+      noop: {
+        getActions(cb) {
+          cb(null, [])
+        },
+        needsOwnProject: false,
+      },
+
+      joinReadWriteProject: {
+        getActions(cb) {
+          cb(null, [
+            { rpc: 'joinProject', args: [{ project_id: readWriteProjectId }] },
+          ])
+        },
+        needsOwnProject: false,
+      },
+
+      joinReadWriteProjectAndDoc: {
+        getActions(cb) {
+          cb(null, [
+            { rpc: 'joinProject', args: [{ project_id: readWriteProjectId }] },
+            { rpc: 'joinDoc', args: [readWriteDocId] },
+          ])
+        },
+        needsOwnProject: false,
+      },
+
+      joinOwnProject: {
+        getActions(cb) {
+          cb(null, [
+            { rpc: 'joinProject', args: [{ project_id: options.project_id }] },
+          ])
+        },
+        needsOwnProject: true,
+      },
+
+      joinOwnProjectAndDoc: {
+        getActions(cb) {
+          cb(null, [
+            { rpc: 'joinProject', args: [{ project_id: options.project_id }] },
+            { rpc: 'joinDoc', args: [options.doc_id] },
+          ])
+        },
+        needsOwnProject: true,
+      },
+    }
+
+    function performActions(getActions, done) {
+      getActions((err, actions) => {
+        if (err) return done(err)
+
+        async.eachSeries(
+          actions,
+          (action, cb) => {
+            if (action.rpc) {
+              client.emit(action.rpc, ...action.args, (...returnedArgs) => {
+                const error = returnedArgs.shift()
+                if (action.fails) {
+                  expect(error).to.exist
+                  expect(returnedArgs).to.have.length(0)
+                  return cb()
+                }
+                cb(error)
+              })
+            } else {
+              cb(new Error('unexpected action'))
+            }
+          },
+          done
+        )
+      })
+    }
+
+    describe(userDescription, function () {
+      beforeEach(function userSetup(done) {
+        userItem.setup((err, _options) => {
+          if (err) return done(err)
+
+          options = _options
+          client = options.client
+          client.on('connectionAccepted', done)
+        })
+      })
+
+      Object.entries(SESSION_SETUP).forEach(level1 => {
+        const [sessionSetupDescription, sessionSetupItem] = level1
+        const INVALID_REQUESTS = {
+          noop: {
+            getActions(cb) {
+              cb(null, [])
+            },
+          },
+
+          joinProjectWithDocId: {
+            getActions(cb) {
+              cb(null, [
+                {
+                  rpc: 'joinProject',
+                  args: [{ project_id: privateDocId }],
+                  fails: 1,
+                },
+              ])
+            },
+          },
+
+          joinDocWithDocId: {
+            getActions(cb) {
+              cb(null, [{ rpc: 'joinDoc', args: [privateDocId], fails: 1 }])
+            },
+          },
+
+          joinProjectWithProjectId: {
+            getActions(cb) {
+              cb(null, [
+                {
+                  rpc: 'joinProject',
+                  args: [{ project_id: privateProjectId }],
+                  fails: 1,
+                },
+              ])
+            },
+          },
+
+          joinDocWithProjectId: {
+            getActions(cb) {
+              cb(null, [{ rpc: 'joinDoc', args: [privateProjectId], fails: 1 }])
+            },
+          },
+
+          joinProjectWithProjectIdThenJoinDocWithDocId: {
+            getActions(cb) {
+              cb(null, [
+                {
+                  rpc: 'joinProject',
+                  args: [{ project_id: privateProjectId }],
+                  fails: 1,
+                },
+                { rpc: 'joinDoc', args: [privateDocId], fails: 1 },
+              ])
+            },
+          },
+        }
+
+        // skip some areas of the matrix
+        // - some Users do not have an own project
+        const skip = sessionSetupItem.needsOwnProject && !userItem.hasOwnProject
+
+        describe(sessionSetupDescription, function () {
+          beforeEach(function performSessionActions(done) {
+            if (skip) return this.skip()
+            performActions(sessionSetupItem.getActions, done)
+          })
+
+          Object.entries(INVALID_REQUESTS).forEach(level2 => {
+            const [InvalidRequestDescription, InvalidRequestItem] = level2
+            describe(InvalidRequestDescription, function () {
+              beforeEach(function performInvalidRequests(done) {
+                performActions(InvalidRequestItem.getActions, done)
+              })
+
+              describe('rooms', function () {
+                it('should not add the user into the privateProject room', function (done) {
+                  RealTimeClient.getConnectedClient(
+                    client.socket.sessionid,
+                    (error, client) => {
+                      if (error) return done(error)
+                      expect(client.rooms).to.not.include(privateProjectId)
+                      done()
+                    }
+                  )
+                })
+
+                it('should not add the user into the privateDoc room', function (done) {
+                  RealTimeClient.getConnectedClient(
+                    client.socket.sessionid,
+                    (error, client) => {
+                      if (error) return done(error)
+                      expect(client.rooms).to.not.include(privateDocId)
+                      done()
+                    }
+                  )
+                })
+              })
+
+              describe('receive updates', function () {
+                const receivedMessages = []
+                beforeEach(function publishAnUpdateInRedis(done) {
+                  const update = {
+                    doc_id: privateDocId,
+                    op: {
+                      meta: { source: privateClient.publicId },
+                      v: 42,
+                      doc: privateDocId,
+                      op: [{ i: 'foo', p: 50 }],
+                    },
+                  }
+                  client.on('otUpdateApplied', update => {
+                    receivedMessages.push(update)
+                  })
+                  privateClient.once('otUpdateApplied', () => {
+                    setTimeout(done, 10)
+                  })
+                  rclient.publish('applied-ops', JSON.stringify(update))
+                })
+
+                it('should send nothing to client', function () {
+                  expect(receivedMessages).to.have.length(0)
+                })
+              })
+
+              describe('receive messages from web', function () {
+                const receivedMessages = []
+                beforeEach(function publishAMessageInRedis(done) {
+                  const event = {
+                    room_id: privateProjectId,
+                    message: 'removeEntity',
+                    payload: ['foo', 'convertDocToFile'],
+                    _id: 'web:123',
+                  }
+                  client.on('removeEntity', (...args) => {
+                    receivedMessages.push(args)
+                  })
+                  privateClient.once('removeEntity', () => {
+                    setTimeout(done, 10)
+                  })
+                  rclient.publish('editor-events', JSON.stringify(event))
+                })
+
+                it('should send nothing to client', function () {
+                  expect(receivedMessages).to.have.length(0)
+                })
+              })
+
+              describe('send updates', function () {
+                let receivedArgs, submittedUpdates, update
+
+                beforeEach(function cleanup(done) {
+                  cleanupPreviousUpdates(privateDocId, done)
+                })
+
+                beforeEach(function setupUpdateFields() {
+                  update = {
+                    doc_id: privateDocId,
+                    op: {
+                      v: 43,
+                      lastV: 42,
+                      doc: privateDocId,
+                      op: [{ i: 'foo', p: 50 }],
+                    },
+                  }
+                })
+
+                beforeEach(function sendAsUser(done) {
+                  const userUpdate = Object.assign({}, update, {
+                    hash: 'user',
+                  })
+
+                  client.emit(
+                    'applyOtUpdate',
+                    privateDocId,
+                    userUpdate,
+                    (...args) => {
+                      receivedArgs = args
+                      done()
+                    }
+                  )
+                })
+
+                beforeEach(function sendAsPrivateUserForReferenceOp(done) {
+                  const privateUpdate = Object.assign({}, update, {
+                    hash: 'private',
+                  })
+
+                  privateClient.emit(
+                    'applyOtUpdate',
+                    privateDocId,
+                    privateUpdate,
+                    done
+                  )
+                })
+
+                beforeEach(function fetchPendingOps(done) {
+                  getPendingUpdates(privateDocId, (err, updates) => {
+                    submittedUpdates = updates
+                    done(err)
+                  })
+                })
+
+                it('should error out trying to send', function () {
+                  expect(receivedArgs).to.have.length(1)
+                  expect(receivedArgs[0]).to.have.property('message')
+                  // we are using an old version of chai: 1.9.2
+                  // TypeError: expect(...).to.be.oneOf is not a function
+                  expect(
+                    [
+                      'no project_id found on client',
+                      'not authorized',
+                    ].includes(receivedArgs[0].message)
+                  ).to.equal(true)
+                })
+
+                it('should submit the private users message only', function () {
+                  expect(submittedUpdates).to.have.length(1)
+                  const update = JSON.parse(submittedUpdates[0])
+                  expect(update.hash).to.equal('private')
+                })
+              })
+            })
+          })
+        })
+      })
+    })
+  })
+})

services/real-time/test/acceptance/js/PubSubRace.js

@@ -0,0 +1,373 @@
+/* eslint-disable
+    camelcase,
+    no-return-assign,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const RealTimeClient = require('./helpers/RealTimeClient')
+const MockDocUpdaterServer = require('./helpers/MockDocUpdaterServer')
+const FixturesManager = require('./helpers/FixturesManager')
+
+const async = require('async')
+
+const settings = require('@overleaf/settings')
+const redis = require('@overleaf/redis-wrapper')
+const rclient = redis.createClient(settings.redis.pubsub)
+
+describe('PubSubRace', function () {
+  before(function (done) {
+    return MockDocUpdaterServer.run(done)
+  })
+
+  describe('when the client leaves a doc before joinDoc completes', function () {
+    before(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'owner',
+                project: {
+                  name: 'Test Project',
+                },
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb()
+              }
+            )
+          },
+
+          cb => {
+            this.clientA = RealTimeClient.connect()
+            return this.clientA.on('connect', cb)
+          },
+
+          cb => {
+            return this.clientA.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              (error, project, privilegeLevel, protocolVersion) => {
+                this.project = project
+                this.privilegeLevel = privilegeLevel
+                this.protocolVersion = protocolVersion
+                return cb(error)
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              { lines: this.lines, version: this.version, ops: this.ops },
+              (e, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            this.clientA.emit('joinDoc', this.doc_id, () => {})
+            // leave before joinDoc completes
+            return this.clientA.emit('leaveDoc', this.doc_id, cb)
+          },
+
+          cb => {
+            // wait for subscribe and unsubscribe
+            return setTimeout(cb, 100)
+          },
+        ],
+        done
+      )
+    })
+
+    return it('should not subscribe to the applied-ops channels anymore', function (done) {
+      rclient.pubsub('CHANNELS', (err, resp) => {
+        if (err) {
+          return done(err)
+        }
+        resp.should.not.include(`applied-ops:${this.doc_id}`)
+        return done()
+      })
+      return null
+    })
+  })
+
+  describe('when the client emits joinDoc and leaveDoc requests frequently and leaves eventually', function () {
+    before(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'owner',
+                project: {
+                  name: 'Test Project',
+                },
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb()
+              }
+            )
+          },
+
+          cb => {
+            this.clientA = RealTimeClient.connect()
+            return this.clientA.on('connect', cb)
+          },
+
+          cb => {
+            return this.clientA.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              (error, project, privilegeLevel, protocolVersion) => {
+                this.project = project
+                this.privilegeLevel = privilegeLevel
+                this.protocolVersion = protocolVersion
+                return cb(error)
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              { lines: this.lines, version: this.version, ops: this.ops },
+              (e, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            this.clientA.emit('joinDoc', this.doc_id, () => {})
+            this.clientA.emit('leaveDoc', this.doc_id, () => {})
+            this.clientA.emit('joinDoc', this.doc_id, () => {})
+            this.clientA.emit('leaveDoc', this.doc_id, () => {})
+            this.clientA.emit('joinDoc', this.doc_id, () => {})
+            this.clientA.emit('leaveDoc', this.doc_id, () => {})
+            this.clientA.emit('joinDoc', this.doc_id, () => {})
+            this.clientA.emit('leaveDoc', this.doc_id, () => {})
+            this.clientA.emit('joinDoc', this.doc_id, () => {})
+            return this.clientA.emit('leaveDoc', this.doc_id, cb)
+          },
+
+          cb => {
+            // wait for subscribe and unsubscribe
+            return setTimeout(cb, 100)
+          },
+        ],
+        done
+      )
+    })
+
+    return it('should not subscribe to the applied-ops channels anymore', function (done) {
+      rclient.pubsub('CHANNELS', (err, resp) => {
+        if (err) {
+          return done(err)
+        }
+        resp.should.not.include(`applied-ops:${this.doc_id}`)
+        return done()
+      })
+      return null
+    })
+  })
+
+  describe('when the client emits joinDoc and leaveDoc requests frequently and remains in the doc', function () {
+    before(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'owner',
+                project: {
+                  name: 'Test Project',
+                },
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb()
+              }
+            )
+          },
+
+          cb => {
+            this.clientA = RealTimeClient.connect()
+            return this.clientA.on('connect', cb)
+          },
+
+          cb => {
+            return this.clientA.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              (error, project, privilegeLevel, protocolVersion) => {
+                this.project = project
+                this.privilegeLevel = privilegeLevel
+                this.protocolVersion = protocolVersion
+                return cb(error)
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              { lines: this.lines, version: this.version, ops: this.ops },
+              (e, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            this.clientA.emit('joinDoc', this.doc_id, () => {})
+            this.clientA.emit('leaveDoc', this.doc_id, () => {})
+            this.clientA.emit('joinDoc', this.doc_id, () => {})
+            this.clientA.emit('leaveDoc', this.doc_id, () => {})
+            this.clientA.emit('joinDoc', this.doc_id, () => {})
+            this.clientA.emit('leaveDoc', this.doc_id, () => {})
+            this.clientA.emit('joinDoc', this.doc_id, () => {})
+            this.clientA.emit('leaveDoc', this.doc_id, () => {})
+            return this.clientA.emit('joinDoc', this.doc_id, cb)
+          },
+
+          cb => {
+            // wait for subscribe and unsubscribe
+            return setTimeout(cb, 100)
+          },
+        ],
+        done
+      )
+    })
+
+    return it('should subscribe to the applied-ops channels', function (done) {
+      rclient.pubsub('CHANNELS', (err, resp) => {
+        if (err) {
+          return done(err)
+        }
+        resp.should.include(`applied-ops:${this.doc_id}`)
+        return done()
+      })
+      return null
+    })
+  })
+
+  return describe('when the client disconnects before joinDoc completes', function () {
+    before(function (done) {
+      return async.series(
+        [
+          cb => {
+            return FixturesManager.setUpProject(
+              {
+                privilegeLevel: 'owner',
+                project: {
+                  name: 'Test Project',
+                },
+              },
+              (e, { project_id, user_id }) => {
+                this.project_id = project_id
+                this.user_id = user_id
+                return cb()
+              }
+            )
+          },
+
+          cb => {
+            this.clientA = RealTimeClient.connect()
+            return this.clientA.on('connect', cb)
+          },
+
+          cb => {
+            return this.clientA.emit(
+              'joinProject',
+              { project_id: this.project_id },
+              (error, project, privilegeLevel, protocolVersion) => {
+                this.project = project
+                this.privilegeLevel = privilegeLevel
+                this.protocolVersion = protocolVersion
+                return cb(error)
+              }
+            )
+          },
+
+          cb => {
+            return FixturesManager.setUpDoc(
+              this.project_id,
+              { lines: this.lines, version: this.version, ops: this.ops },
+              (e, { doc_id }) => {
+                this.doc_id = doc_id
+                return cb(e)
+              }
+            )
+          },
+
+          cb => {
+            let joinDocCompleted = false
+            this.clientA.emit(
+              'joinDoc',
+              this.doc_id,
+              () => (joinDocCompleted = true)
+            )
+            // leave before joinDoc completes
+            return setTimeout(
+              () => {
+                if (joinDocCompleted) {
+                  return cb(new Error('joinDocCompleted -- lower timeout'))
+                }
+                this.clientA.on('disconnect', () => cb())
+                return this.clientA.disconnect()
+              },
+              // socket.io processes joinDoc and disconnect with different delays:
+              //  - joinDoc goes through two process.nextTick
+              //  - disconnect goes through one process.nextTick
+              // We have to inject the disconnect event into a different event loop
+              //  cycle.
+              3
+            )
+          },
+
+          cb => {
+            // wait for subscribe and unsubscribe
+            return setTimeout(cb, 100)
+          },
+        ],
+        done
+      )
+    })
+
+    it('should not subscribe to the editor-events channels anymore', function (done) {
+      rclient.pubsub('CHANNELS', (err, resp) => {
+        if (err) {
+          return done(err)
+        }
+        resp.should.not.include(`editor-events:${this.project_id}`)
+        return done()
+      })
+      return null
+    })
+
+    return it('should not subscribe to the applied-ops channels anymore', function (done) {
+      rclient.pubsub('CHANNELS', (err, resp) => {
+        if (err) {
+          return done(err)
+        }
+        resp.should.not.include(`applied-ops:${this.doc_id}`)
+        return done()
+      })
+      return null
+    })
+  })
+})

services/real-time/test/acceptance/js/ReceiveUpdateTests.js

@@ -0,0 +1,347 @@
+/* eslint-disable
+    camelcase,
+    handle-callback-err,
+    no-unused-vars,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * DS207: Consider shorter variations of null checks
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const { expect } = require('chai')
+
+const RealTimeClient = require('./helpers/RealTimeClient')
+const MockWebServer = require('./helpers/MockWebServer')
+const FixturesManager = require('./helpers/FixturesManager')
+
+const async = require('async')
+
+const settings = require('@overleaf/settings')
+const redis = require('@overleaf/redis-wrapper')
+const rclient = redis.createClient(settings.redis.pubsub)
+
+describe('receiveUpdate', function () {
+  beforeEach(function (done) {
+    this.lines = ['test', 'doc', 'lines']
+    this.version = 42
+    this.ops = ['mock', 'doc', 'ops']
+
+    return async.series(
+      [
+        cb => {
+          return FixturesManager.setUpProject(
+            {
+              privilegeLevel: 'owner',
+              project: { name: 'Test Project' },
+            },
+            (error, { user_id, project_id }) => {
+              this.user_id = user_id
+              this.project_id = project_id
+              return cb()
+            }
+          )
+        },
+
+        cb => {
+          return FixturesManager.setUpDoc(
+            this.project_id,
+            { lines: this.lines, version: this.version, ops: this.ops },
+            (e, { doc_id }) => {
+              this.doc_id = doc_id
+              return cb(e)
+            }
+          )
+        },
+
+        cb => {
+          this.clientA = RealTimeClient.connect()
+          return this.clientA.on('connectionAccepted', cb)
+        },
+
+        cb => {
+          this.clientB = RealTimeClient.connect()
+          return this.clientB.on('connectionAccepted', cb)
+        },
+
+        cb => {
+          return this.clientA.emit(
+            'joinProject',
+            {
+              project_id: this.project_id,
+            },
+            cb
+          )
+        },
+
+        cb => {
+          return this.clientA.emit('joinDoc', this.doc_id, cb)
+        },
+
+        cb => {
+          return this.clientB.emit(
+            'joinProject',
+            {
+              project_id: this.project_id,
+            },
+            cb
+          )
+        },
+
+        cb => {
+          return this.clientB.emit('joinDoc', this.doc_id, cb)
+        },
+
+        cb => {
+          return FixturesManager.setUpProject(
+            {
+              privilegeLevel: 'owner',
+              project: { name: 'Test Project' },
+            },
+            (
+              error,
+              { user_id: user_id_second, project_id: project_id_second }
+            ) => {
+              this.user_id_second = user_id_second
+              this.project_id_second = project_id_second
+              return cb()
+            }
+          )
+        },
+
+        cb => {
+          return FixturesManager.setUpDoc(
+            this.project_id_second,
+            { lines: this.lines, version: this.version, ops: this.ops },
+            (e, { doc_id: doc_id_second }) => {
+              this.doc_id_second = doc_id_second
+              return cb(e)
+            }
+          )
+        },
+
+        cb => {
+          this.clientC = RealTimeClient.connect()
+          return this.clientC.on('connectionAccepted', cb)
+        },
+
+        cb => {
+          return this.clientC.emit(
+            'joinProject',
+            {
+              project_id: this.project_id_second,
+            },
+            cb
+          )
+        },
+        cb => {
+          return this.clientC.emit('joinDoc', this.doc_id_second, cb)
+        },
+
+        cb => {
+          this.clientAUpdates = []
+          this.clientA.on('otUpdateApplied', update =>
+            this.clientAUpdates.push(update)
+          )
+          this.clientBUpdates = []
+          this.clientB.on('otUpdateApplied', update =>
+            this.clientBUpdates.push(update)
+          )
+          this.clientCUpdates = []
+          this.clientC.on('otUpdateApplied', update =>
+            this.clientCUpdates.push(update)
+          )
+
+          this.clientAErrors = []
+          this.clientA.on('otUpdateError', error =>
+            this.clientAErrors.push(error)
+          )
+          this.clientBErrors = []
+          this.clientB.on('otUpdateError', error =>
+            this.clientBErrors.push(error)
+          )
+          this.clientCErrors = []
+          this.clientC.on('otUpdateError', error =>
+            this.clientCErrors.push(error)
+          )
+          return cb()
+        },
+      ],
+      done
+    )
+  })
+
+  afterEach(function () {
+    if (this.clientA != null) {
+      this.clientA.disconnect()
+    }
+    if (this.clientB != null) {
+      this.clientB.disconnect()
+    }
+    return this.clientC != null ? this.clientC.disconnect() : undefined
+  })
+
+  describe('with an update from clientA', function () {
+    beforeEach(function (done) {
+      this.update = {
+        doc_id: this.doc_id,
+        op: {
+          meta: {
+            source: this.clientA.publicId,
+          },
+          v: this.version,
+          doc: this.doc_id,
+          op: [{ i: 'foo', p: 50 }],
+        },
+      }
+      rclient.publish('applied-ops', JSON.stringify(this.update))
+      return setTimeout(done, 200)
+    }) // Give clients time to get message
+
+    it('should send the full op to clientB', function () {
+      return this.clientBUpdates.should.deep.equal([this.update.op])
+    })
+
+    it('should send an ack to clientA', function () {
+      return this.clientAUpdates.should.deep.equal([
+        {
+          v: this.version,
+          doc: this.doc_id,
+        },
+      ])
+    })
+
+    return it('should send nothing to clientC', function () {
+      return this.clientCUpdates.should.deep.equal([])
+    })
+  })
+
+  describe('with an update from clientC', function () {
+    beforeEach(function (done) {
+      this.update = {
+        doc_id: this.doc_id_second,
+        op: {
+          meta: {
+            source: this.clientC.publicId,
+          },
+          v: this.version,
+          doc: this.doc_id_second,
+          op: [{ i: 'update from clientC', p: 50 }],
+        },
+      }
+      rclient.publish('applied-ops', JSON.stringify(this.update))
+      return setTimeout(done, 200)
+    }) // Give clients time to get message
+
+    it('should send nothing to clientA', function () {
+      return this.clientAUpdates.should.deep.equal([])
+    })
+
+    it('should send nothing to clientB', function () {
+      return this.clientBUpdates.should.deep.equal([])
+    })
+
+    return it('should send an ack to clientC', function () {
+      return this.clientCUpdates.should.deep.equal([
+        {
+          v: this.version,
+          doc: this.doc_id_second,
+        },
+      ])
+    })
+  })
+
+  describe('with an update from a remote client for project 1', function () {
+    beforeEach(function (done) {
+      this.update = {
+        doc_id: this.doc_id,
+        op: {
+          meta: {
+            source: 'this-is-a-remote-client-id',
+          },
+          v: this.version,
+          doc: this.doc_id,
+          op: [{ i: 'foo', p: 50 }],
+        },
+      }
+      rclient.publish('applied-ops', JSON.stringify(this.update))
+      return setTimeout(done, 200)
+    }) // Give clients time to get message
+
+    it('should send the full op to clientA', function () {
+      return this.clientAUpdates.should.deep.equal([this.update.op])
+    })
+
+    it('should send the full op to clientB', function () {
+      return this.clientBUpdates.should.deep.equal([this.update.op])
+    })
+
+    return it('should send nothing to clientC', function () {
+      return this.clientCUpdates.should.deep.equal([])
+    })
+  })
+
+  describe('with an error for the first project', function () {
+    beforeEach(function (done) {
+      rclient.publish(
+        'applied-ops',
+        JSON.stringify({
+          doc_id: this.doc_id,
+          error: (this.error = 'something went wrong'),
+        })
+      )
+      return setTimeout(done, 200)
+    }) // Give clients time to get message
+
+    it('should send the error to the clients in the first project', function () {
+      this.clientAErrors.should.deep.equal([this.error])
+      return this.clientBErrors.should.deep.equal([this.error])
+    })
+
+    it('should not send any errors to the client in the second project', function () {
+      return this.clientCErrors.should.deep.equal([])
+    })
+
+    it('should disconnect the clients of the first project', function () {
+      this.clientA.socket.connected.should.equal(false)
+      return this.clientB.socket.connected.should.equal(false)
+    })
+
+    return it('should not disconnect the client in the second project', function () {
+      return this.clientC.socket.connected.should.equal(true)
+    })
+  })
+
+  return describe('with an error for the second project', function () {
+    beforeEach(function (done) {
+      rclient.publish(
+        'applied-ops',
+        JSON.stringify({
+          doc_id: this.doc_id_second,
+          error: (this.error = 'something went wrong'),
+        })
+      )
+      return setTimeout(done, 200)
+    }) // Give clients time to get message
+
+    it('should not send any errors to the clients in the first project', function () {
+      this.clientAErrors.should.deep.equal([])
+      return this.clientBErrors.should.deep.equal([])
+    })
+
+    it('should send the error to the client in the second project', function () {
+      return this.clientCErrors.should.deep.equal([this.error])
+    })
+
+    it('should not disconnect the clients of the first project', function () {
+      this.clientA.socket.connected.should.equal(true)
+      return this.clientB.socket.connected.should.equal(true)
+    })
+
+    return it('should disconnect the client in the second project', function () {
+      return this.clientC.socket.connected.should.equal(false)
+    })
+  })
+})

services/real-time/test/acceptance/js/RouterTests.js

@@ -0,0 +1,121 @@
+/* eslint-disable
+    camelcase,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const async = require('async')
+const { expect } = require('chai')
+
+const RealTimeClient = require('./helpers/RealTimeClient')
+const FixturesManager = require('./helpers/FixturesManager')
+
+describe('Router', function () {
+  return describe('joinProject', function () {
+    describe('when there is no callback provided', function () {
+      after(function () {
+        return process.removeListener('unhandledRejection', this.onUnhandled)
+      })
+
+      before(function (done) {
+        this.onUnhandled = error => done(error)
+        process.on('unhandledRejection', this.onUnhandled)
+        return async.series(
+          [
+            cb => {
+              return FixturesManager.setUpProject(
+                {
+                  privilegeLevel: 'owner',
+                  project: {
+                    name: 'Test Project',
+                  },
+                },
+                (e, { project_id, user_id }) => {
+                  this.project_id = project_id
+                  this.user_id = user_id
+                  return cb(e)
+                }
+              )
+            },
+
+            cb => {
+              this.client = RealTimeClient.connect()
+              return this.client.on('connectionAccepted', cb)
+            },
+
+            cb => {
+              this.client = RealTimeClient.connect()
+              return this.client.on('connectionAccepted', cb)
+            },
+
+            cb => {
+              this.client.emit('joinProject', { project_id: this.project_id })
+              return setTimeout(cb, 100)
+            },
+          ],
+          done
+        )
+      })
+
+      return it('should keep on going', function () {
+        return expect('still running').to.exist
+      })
+    })
+
+    return describe('when there are too many arguments', function () {
+      after(function () {
+        return process.removeListener('unhandledRejection', this.onUnhandled)
+      })
+
+      before(function (done) {
+        this.onUnhandled = error => done(error)
+        process.on('unhandledRejection', this.onUnhandled)
+        return async.series(
+          [
+            cb => {
+              return FixturesManager.setUpProject(
+                {
+                  privilegeLevel: 'owner',
+                  project: {
+                    name: 'Test Project',
+                  },
+                },
+                (e, { project_id, user_id }) => {
+                  this.project_id = project_id
+                  this.user_id = user_id
+                  return cb(e)
+                }
+              )
+            },
+
+            cb => {
+              this.client = RealTimeClient.connect()
+              return this.client.on('connectionAccepted', cb)
+            },
+
+            cb => {
+              this.client = RealTimeClient.connect()
+              return this.client.on('connectionAccepted', cb)
+            },
+
+            cb => {
+              return this.client.emit('joinProject', 1, 2, 3, 4, 5, error => {
+                this.error = error
+                return cb()
+              })
+            },
+          ],
+          done
+        )
+      })
+
+      return it('should return an error message', function () {
+        return expect(this.error.message).to.equal('unexpected arguments')
+      })
+    })
+  })
+})

services/real-time/test/acceptance/js/SessionSocketsTests.js

@@ -0,0 +1,103 @@
+/* eslint-disable
+    no-return-assign,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const RealTimeClient = require('./helpers/RealTimeClient')
+const Settings = require('@overleaf/settings')
+const { expect } = require('chai')
+
+describe('SessionSockets', function () {
+  before(function () {
+    return (this.checkSocket = function (fn) {
+      const client = RealTimeClient.connect()
+      client.on('connectionAccepted', fn)
+      client.on('connectionRejected', fn)
+      return null
+    })
+  })
+
+  describe('without cookies', function () {
+    before(function () {
+      return (RealTimeClient.cookie = null)
+    })
+
+    return it('should return a lookup error', function (done) {
+      return this.checkSocket(error => {
+        expect(error).to.exist
+        expect(error.message).to.equal('invalid session')
+        return done()
+      })
+    })
+  })
+
+  describe('with a different cookie', function () {
+    before(function () {
+      return (RealTimeClient.cookie = 'some.key=someValue')
+    })
+
+    return it('should return a lookup error', function (done) {
+      return this.checkSocket(error => {
+        expect(error).to.exist
+        expect(error.message).to.equal('invalid session')
+        return done()
+      })
+    })
+  })
+
+  describe('with an invalid cookie', function () {
+    before(function (done) {
+      RealTimeClient.setSession({}, error => {
+        if (error) {
+          return done(error)
+        }
+        RealTimeClient.cookie = `${
+          Settings.cookieName
+        }=${RealTimeClient.cookie.slice(17, 49)}`
+        return done()
+      })
+      return null
+    })
+
+    return it('should return a lookup error', function (done) {
+      return this.checkSocket(error => {
+        expect(error).to.exist
+        expect(error.message).to.equal('invalid session')
+        return done()
+      })
+    })
+  })
+
+  describe('with a valid cookie and no matching session', function () {
+    before(function () {
+      return (RealTimeClient.cookie = `${Settings.cookieName}=unknownId`)
+    })
+
+    return it('should return a lookup error', function (done) {
+      return this.checkSocket(error => {
+        expect(error).to.exist
+        expect(error.message).to.equal('invalid session')
+        return done()
+      })
+    })
+  })
+
+  return describe('with a valid cookie and a matching session', function () {
+    before(function (done) {
+      RealTimeClient.setSession({}, done)
+      return null
+    })
+
+    return it('should not return an error', function (done) {
+      return this.checkSocket(error => {
+        expect(error).to.not.exist
+        return done()
+      })
+    })
+  })
+})

services/real-time/test/acceptance/js/SessionTests.js

@@ -0,0 +1,60 @@
+/* eslint-disable
+    handle-callback-err,
+    no-return-assign,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS101: Remove unnecessary use of Array.from
+ * DS102: Remove unnecessary code created because of implicit returns
+ * DS207: Consider shorter variations of null checks
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const { expect } = require('chai')
+
+const RealTimeClient = require('./helpers/RealTimeClient')
+
+describe('Session', function () {
+  return describe('with an established session', function () {
+    before(function (done) {
+      this.user_id = 'mock-user-id'
+      RealTimeClient.setSession(
+        {
+          user: { _id: this.user_id },
+        },
+        error => {
+          if (error != null) {
+            throw error
+          }
+          this.client = RealTimeClient.connect()
+          return done()
+        }
+      )
+      return null
+    })
+
+    it('should not get disconnected', function (done) {
+      let disconnected = false
+      this.client.on('disconnect', () => (disconnected = true))
+      return setTimeout(() => {
+        expect(disconnected).to.equal(false)
+        return done()
+      }, 500)
+    })
+
+    return it('should appear in the list of connected clients', function (done) {
+      return RealTimeClient.getConnectedClients((error, clients) => {
+        let included = false
+        for (const client of Array.from(clients)) {
+          if (client.client_id === this.client.socket.sessionid) {
+            included = true
+            break
+          }
+        }
+        expect(included).to.equal(true)
+        return done()
+      })
+    })
+  })
+})

services/real-time/test/acceptance/js/helpers/FixturesManager.js

@@ -0,0 +1,130 @@
+/* eslint-disable
+    camelcase,
+    handle-callback-err,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * DS207: Consider shorter variations of null checks
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+let FixturesManager
+const RealTimeClient = require('./RealTimeClient')
+const MockWebServer = require('./MockWebServer')
+const MockDocUpdaterServer = require('./MockDocUpdaterServer')
+
+module.exports = FixturesManager = {
+  setUpProject(options, callback) {
+    if (options == null) {
+      options = {}
+    }
+    if (callback == null) {
+      callback = function (error, data) {}
+    }
+    if (!options.user_id) {
+      options.user_id = FixturesManager.getRandomId()
+    }
+    if (!options.project_id) {
+      options.project_id = FixturesManager.getRandomId()
+    }
+    if (!options.project) {
+      options.project = { name: 'Test Project' }
+    }
+    const { project_id, user_id, privilegeLevel, project, publicAccess } =
+      options
+
+    const privileges = {}
+    privileges[user_id] = privilegeLevel
+    if (publicAccess) {
+      privileges['anonymous-user'] = publicAccess
+    }
+
+    MockWebServer.createMockProject(project_id, privileges, project)
+    return MockWebServer.run(error => {
+      if (error != null) {
+        throw error
+      }
+      return RealTimeClient.setSession(
+        {
+          user: {
+            _id: user_id,
+            first_name: 'Joe',
+            last_name: 'Bloggs',
+          },
+        },
+        error => {
+          if (error != null) {
+            throw error
+          }
+          return callback(null, {
+            project_id,
+            user_id,
+            privilegeLevel,
+            project,
+          })
+        }
+      )
+    })
+  },
+
+  setUpDoc(project_id, options, callback) {
+    if (options == null) {
+      options = {}
+    }
+    if (callback == null) {
+      callback = function (error, data) {}
+    }
+    if (!options.doc_id) {
+      options.doc_id = FixturesManager.getRandomId()
+    }
+    if (!options.lines) {
+      options.lines = ['doc', 'lines']
+    }
+    if (!options.version) {
+      options.version = 42
+    }
+    if (!options.ops) {
+      options.ops = ['mock', 'ops']
+    }
+    const { doc_id, lines, version, ops, ranges } = options
+
+    MockDocUpdaterServer.createMockDoc(project_id, doc_id, {
+      lines,
+      version,
+      ops,
+      ranges,
+    })
+    return MockDocUpdaterServer.run(error => {
+      if (error != null) {
+        throw error
+      }
+      return callback(null, { project_id, doc_id, lines, version, ops })
+    })
+  },
+
+  setUpEditorSession(options, callback) {
+    FixturesManager.setUpProject(options, (err, detailsProject) => {
+      if (err) return callback(err)
+
+      FixturesManager.setUpDoc(
+        detailsProject.project_id,
+        options,
+        (err, detailsDoc) => {
+          if (err) return callback(err)
+
+          callback(null, Object.assign({}, detailsProject, detailsDoc))
+        }
+      )
+    })
+  },
+
+  getRandomId() {
+    return require('crypto')
+      .createHash('sha1')
+      .update(Math.random().toString())
+      .digest('hex')
+      .slice(0, 24)
+  },
+}

services/real-time/test/acceptance/js/helpers/MockDocUpdaterServer.js

@@ -0,0 +1,93 @@
+/* eslint-disable
+    camelcase,
+    handle-callback-err,
+    no-return-assign,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * DS207: Consider shorter variations of null checks
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+let MockDocUpdaterServer
+const sinon = require('sinon')
+const express = require('express')
+
+module.exports = MockDocUpdaterServer = {
+  docs: {},
+
+  createMockDoc(project_id, doc_id, data) {
+    return (MockDocUpdaterServer.docs[`${project_id}:${doc_id}`] = data)
+  },
+
+  getDocument(project_id, doc_id, fromVersion, callback) {
+    if (callback == null) {
+      callback = function (error, data) {}
+    }
+    return callback(null, MockDocUpdaterServer.docs[`${project_id}:${doc_id}`])
+  },
+
+  deleteProject: sinon.stub().callsArg(1),
+
+  getDocumentRequest(req, res, next) {
+    const { project_id, doc_id } = req.params
+    let { fromVersion } = req.query
+    fromVersion = parseInt(fromVersion, 10)
+    return MockDocUpdaterServer.getDocument(
+      project_id,
+      doc_id,
+      fromVersion,
+      (error, data) => {
+        if (error != null) {
+          return next(error)
+        }
+        if (!data) {
+          return res.sendStatus(404)
+        }
+        return res.json(data)
+      }
+    )
+  },
+
+  deleteProjectRequest(req, res, next) {
+    const { project_id } = req.params
+    return MockDocUpdaterServer.deleteProject(project_id, error => {
+      if (error != null) {
+        return next(error)
+      }
+      return res.sendStatus(204)
+    })
+  },
+
+  running: false,
+  run(callback) {
+    if (callback == null) {
+      callback = function (error) {}
+    }
+    if (MockDocUpdaterServer.running) {
+      return callback()
+    }
+    const app = express()
+    app.get(
+      '/project/:project_id/doc/:doc_id',
+      MockDocUpdaterServer.getDocumentRequest
+    )
+    app.delete(
+      '/project/:project_id',
+      MockDocUpdaterServer.deleteProjectRequest
+    )
+    return app
+      .listen(3003, error => {
+        MockDocUpdaterServer.running = true
+        return callback(error)
+      })
+      .on('error', error => {
+        console.error('error starting MockDocUpdaterServer:', error.message)
+        return process.exit(1)
+      })
+  },
+}
+
+sinon.spy(MockDocUpdaterServer, 'getDocument')

services/real-time/test/acceptance/js/helpers/MockWebServer.js

@@ -0,0 +1,89 @@
+/* eslint-disable
+    camelcase,
+    handle-callback-err,
+    no-return-assign,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * DS207: Consider shorter variations of null checks
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+let MockWebServer
+const sinon = require('sinon')
+const express = require('express')
+
+module.exports = MockWebServer = {
+  projects: {},
+  privileges: {},
+
+  createMockProject(project_id, privileges, project) {
+    MockWebServer.privileges[project_id] = privileges
+    return (MockWebServer.projects[project_id] = project)
+  },
+
+  joinProject(project_id, user_id, callback) {
+    if (callback == null) {
+      callback = function (error, project, privilegeLevel) {}
+    }
+    return callback(
+      null,
+      MockWebServer.projects[project_id],
+      MockWebServer.privileges[project_id][user_id] ||
+        MockWebServer.privileges[project_id]['anonymous-user']
+    )
+  },
+
+  joinProjectRequest(req, res, next) {
+    const { project_id } = req.params
+    const { user_id } = req.query
+    if (project_id === 'not-found') {
+      return res.status(404).send()
+    }
+    if (project_id === 'forbidden') {
+      return res.status(403).send()
+    }
+    if (project_id === 'rate-limited') {
+      return res.status(429).send()
+    } else {
+      return MockWebServer.joinProject(
+        project_id,
+        user_id,
+        (error, project, privilegeLevel) => {
+          if (error != null) {
+            return next(error)
+          }
+          return res.json({
+            project,
+            privilegeLevel,
+          })
+        }
+      )
+    }
+  },
+
+  running: false,
+  run(callback) {
+    if (callback == null) {
+      callback = function (error) {}
+    }
+    if (MockWebServer.running) {
+      return callback()
+    }
+    const app = express()
+    app.post('/project/:project_id/join', MockWebServer.joinProjectRequest)
+    return app
+      .listen(3000, error => {
+        MockWebServer.running = true
+        return callback(error)
+      })
+      .on('error', error => {
+        console.error('error starting MockWebServer:', error.message)
+        return process.exit(1)
+      })
+  },
+}
+
+sinon.spy(MockWebServer, 'joinProject')

services/real-time/test/acceptance/js/helpers/RealTimeClient.js

@@ -0,0 +1,127 @@
+/* eslint-disable
+    camelcase,
+    handle-callback-err,
+    no-return-assign,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * DS207: Consider shorter variations of null checks
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+let Client
+const { XMLHttpRequest } = require('../../libs/XMLHttpRequest')
+const io = require('socket.io-client')
+const async = require('async')
+
+const request = require('request')
+const Settings = require('@overleaf/settings')
+const redis = require('@overleaf/redis-wrapper')
+const rclient = redis.createClient(Settings.redis.websessions)
+
+const uid = require('uid-safe').sync
+const signature = require('cookie-signature')
+
+io.util.request = function () {
+  const xhr = new XMLHttpRequest()
+  const _open = xhr.open
+  xhr.open = function () {
+    _open.apply(xhr, arguments)
+    if (Client.cookie != null) {
+      return xhr.setRequestHeader('Cookie', Client.cookie)
+    }
+  }
+  return xhr
+}
+
+module.exports = Client = {
+  cookie: null,
+
+  setSession(session, callback) {
+    if (callback == null) {
+      callback = function (error) {}
+    }
+    const sessionId = uid(24)
+    session.cookie = {}
+    return rclient.set('sess:' + sessionId, JSON.stringify(session), error => {
+      if (error != null) {
+        return callback(error)
+      }
+      const secret = Settings.security.sessionSecret
+      const cookieKey = 's:' + signature.sign(sessionId, secret)
+      Client.cookie = `${Settings.cookieName}=${cookieKey}`
+      return callback()
+    })
+  },
+
+  unsetSession(callback) {
+    if (callback == null) {
+      callback = function (error) {}
+    }
+    Client.cookie = null
+    return callback()
+  },
+
+  connect(cookie) {
+    const client = io.connect('http://localhost:3026', {
+      'force new connection': true,
+    })
+    client.on(
+      'connectionAccepted',
+      (_, publicId) => (client.publicId = publicId)
+    )
+    return client
+  },
+
+  getConnectedClients(callback) {
+    if (callback == null) {
+      callback = function (error, clients) {}
+    }
+    return request.get(
+      {
+        url: 'http://localhost:3026/clients',
+        json: true,
+      },
+      (error, response, data) => callback(error, data)
+    )
+  },
+
+  getConnectedClient(client_id, callback) {
+    if (callback == null) {
+      callback = function (error, clients) {}
+    }
+    return request.get(
+      {
+        url: `http://localhost:3026/clients/${client_id}`,
+        json: true,
+      },
+      (error, response, data) => callback(error, data)
+    )
+  },
+
+  disconnectClient(client_id, callback) {
+    request.post(
+      {
+        url: `http://localhost:3026/client/${client_id}/disconnect`,
+        auth: {
+          user: Settings.internal.realTime.user,
+          pass: Settings.internal.realTime.pass,
+        },
+      },
+      (error, response, data) => callback(error, data)
+    )
+    return null
+  },
+
+  disconnectAllClients(callback) {
+    return Client.getConnectedClients((error, clients) =>
+      async.each(
+        clients,
+        (clientView, cb) => Client.disconnectClient(clientView.client_id, cb),
+        callback
+      )
+    )
+  },
+}

services/real-time/test/acceptance/js/helpers/RealtimeServer.js

@@ -0,0 +1,64 @@
+/* eslint-disable
+    handle-callback-err,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS101: Remove unnecessary use of Array.from
+ * DS102: Remove unnecessary code created because of implicit returns
+ * DS103: Rewrite code to no longer use __guard__
+ * DS205: Consider reworking code to avoid use of IIFEs
+ * DS207: Consider shorter variations of null checks
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const app = require('../../../../app')
+const logger = require('logger-sharelatex')
+const Settings = require('@overleaf/settings')
+
+module.exports = {
+  running: false,
+  initing: false,
+  callbacks: [],
+  ensureRunning(callback) {
+    if (callback == null) {
+      callback = function (error) {}
+    }
+    if (this.running) {
+      return callback()
+    } else if (this.initing) {
+      return this.callbacks.push(callback)
+    } else {
+      this.initing = true
+      this.callbacks.push(callback)
+      return app.listen(
+        __guard__(
+          Settings.internal != null ? Settings.internal.realtime : undefined,
+          x => x.port
+        ),
+        'localhost',
+        error => {
+          if (error != null) {
+            throw error
+          }
+          this.running = true
+          logger.log('clsi running in dev mode')
+
+          return (() => {
+            const result = []
+            for (callback of Array.from(this.callbacks)) {
+              result.push(callback())
+            }
+            return result
+          })()
+        }
+      )
+    }
+  },
+}
+
+function __guard__(value, transform) {
+  return typeof value !== 'undefined' && value !== null
+    ? transform(value)
+    : undefined
+}

services/real-time/test/acceptance/libs/XMLHttpRequest.js

@@ -0,0 +1,579 @@
+/**
+ * Wrapper for built-in http.js to emulate the browser XMLHttpRequest object.
+ *
+ * This can be used with JS designed for browsers to improve reuse of code and
+ * allow the use of existing libraries.
+ *
+ * Usage: include("XMLHttpRequest.js") and use XMLHttpRequest per W3C specs.
+ *
+ * @author Dan DeFelippi <dan@driverdan.com>
+ * @contributor David Ellis <d.f.ellis@ieee.org>
+ * @license MIT
+ */
+
+const { URL } = require('url')
+const spawn = require('child_process').spawn
+const fs = require('fs')
+
+exports.XMLHttpRequest = function () {
+  /**
+   * Private variables
+   */
+  const self = this
+  const http = require('http')
+  const https = require('https')
+
+  // Holds http.js objects
+  let request
+  let response
+
+  // Request settings
+  let settings = {}
+
+  // Set some default headers
+  const defaultHeaders = {
+    'User-Agent': 'node-XMLHttpRequest',
+    Accept: '*/*',
+  }
+
+  let headers = defaultHeaders
+
+  // These headers are not user setable.
+  // The following are allowed but banned in the spec:
+  // * user-agent
+  const forbiddenRequestHeaders = [
+    'accept-charset',
+    'accept-encoding',
+    'access-control-request-headers',
+    'access-control-request-method',
+    'connection',
+    'content-length',
+    'content-transfer-encoding',
+    // "cookie",
+    'cookie2',
+    'date',
+    'expect',
+    'host',
+    'keep-alive',
+    'origin',
+    'referer',
+    'te',
+    'trailer',
+    'transfer-encoding',
+    'upgrade',
+    'via',
+  ]
+
+  // These request methods are not allowed
+  const forbiddenRequestMethods = ['TRACE', 'TRACK', 'CONNECT']
+
+  // Send flag
+  let sendFlag = false
+  // Error flag, used when errors occur or abort is called
+  let errorFlag = false
+
+  // Event listeners
+  const listeners = {}
+
+  /**
+   * Constants
+   */
+
+  this.UNSENT = 0
+  this.OPENED = 1
+  this.HEADERS_RECEIVED = 2
+  this.LOADING = 3
+  this.DONE = 4
+
+  /**
+   * Public vars
+   */
+
+  // Current state
+  this.readyState = this.UNSENT
+
+  // default ready state change handler in case one is not set or is set late
+  this.onreadystatechange = null
+
+  // Result & response
+  this.responseText = ''
+  this.responseXML = ''
+  this.status = null
+  this.statusText = null
+
+  /**
+   * Private methods
+   */
+
+  /**
+   * Check if the specified header is allowed.
+   *
+   * @param string header Header to validate
+   * @return boolean False if not allowed, otherwise true
+   */
+  const isAllowedHttpHeader = function (header) {
+    return (
+      header && forbiddenRequestHeaders.indexOf(header.toLowerCase()) === -1
+    )
+  }
+
+  /**
+   * Check if the specified method is allowed.
+   *
+   * @param string method Request method to validate
+   * @return boolean False if not allowed, otherwise true
+   */
+  const isAllowedHttpMethod = function (method) {
+    return method && forbiddenRequestMethods.indexOf(method) === -1
+  }
+
+  /**
+   * Public methods
+   */
+
+  /**
+   * Open the connection. Currently supports local server requests.
+   *
+   * @param string method Connection method (eg GET, POST)
+   * @param string url URL for the connection.
+   * @param boolean async Asynchronous connection. Default is true.
+   * @param string user Username for basic authentication (optional)
+   * @param string password Password for basic authentication (optional)
+   */
+  this.open = function (method, url, async, user, password) {
+    this.abort()
+    errorFlag = false
+
+    // Check for valid request method
+    if (!isAllowedHttpMethod(method)) {
+      throw new Error('SecurityError: Request method not allowed')
+    }
+
+    settings = {
+      method: method,
+      url: url.toString(),
+      async: typeof async !== 'boolean' ? true : async,
+      user: user || null,
+      password: password || null,
+    }
+
+    setState(this.OPENED)
+  }
+
+  /**
+   * Sets a header for the request.
+   *
+   * @param string header Header name
+   * @param string value Header value
+   */
+  this.setRequestHeader = function (header, value) {
+    if (this.readyState !== this.OPENED) {
+      throw new Error(
+        'INVALID_STATE_ERR: setRequestHeader can only be called when state is OPEN'
+      )
+    }
+    if (!isAllowedHttpHeader(header)) {
+      console.warn('Refused to set unsafe header "' + header + '"')
+      return
+    }
+    if (sendFlag) {
+      throw new Error('INVALID_STATE_ERR: send flag is true')
+    }
+    headers[header] = value
+  }
+
+  /**
+   * Gets a header from the server response.
+   *
+   * @param string header Name of header to get.
+   * @return string Text of the header or null if it doesn't exist.
+   */
+  this.getResponseHeader = function (header) {
+    if (
+      typeof header === 'string' &&
+      this.readyState > this.OPENED &&
+      response.headers[header.toLowerCase()] &&
+      !errorFlag
+    ) {
+      return response.headers[header.toLowerCase()]
+    }
+
+    return null
+  }
+
+  /**
+   * Gets all the response headers.
+   *
+   * @return string A string with all response headers separated by CR+LF
+   */
+  this.getAllResponseHeaders = function () {
+    if (this.readyState < this.HEADERS_RECEIVED || errorFlag) {
+      return ''
+    }
+    let result = ''
+
+    for (const i in response.headers) {
+      // Cookie headers are excluded
+      if (i !== 'set-cookie' && i !== 'set-cookie2') {
+        result += i + ': ' + response.headers[i] + '\r\n'
+      }
+    }
+    return result.substr(0, result.length - 2)
+  }
+
+  /**
+   * Gets a request header
+   *
+   * @param string name Name of header to get
+   * @return string Returns the request header or empty string if not set
+   */
+  this.getRequestHeader = function (name) {
+    // @TODO Make this case insensitive
+    if (typeof name === 'string' && headers[name]) {
+      return headers[name]
+    }
+
+    return ''
+  }
+
+  /**
+   * Sends the request to the server.
+   *
+   * @param string data Optional data to send as request body.
+   */
+  this.send = function (data) {
+    if (this.readyState !== this.OPENED) {
+      throw new Error(
+        'INVALID_STATE_ERR: connection must be opened before send() is called'
+      )
+    }
+
+    if (sendFlag) {
+      throw new Error('INVALID_STATE_ERR: send has already been called')
+    }
+
+    let host
+    let ssl = false
+    let local = false
+    const url = new URL(settings.url)
+
+    // Determine the server
+    switch (url.protocol) {
+      case 'https:':
+        ssl = true
+        host = url.hostname
+        break
+      case 'http:':
+        host = url.hostname
+        break
+
+      case 'file:':
+        local = true
+        break
+
+      case undefined:
+      case '':
+        host = 'localhost'
+        break
+
+      default:
+        throw new Error('Protocol not supported.')
+    }
+
+    // Load files off the local filesystem (file://)
+    if (local) {
+      if (settings.method !== 'GET') {
+        throw new Error('XMLHttpRequest: Only GET method is supported')
+      }
+
+      if (settings.async) {
+        fs.readFile(url.pathname, 'utf8', (error, data) => {
+          if (error) {
+            self.handleError(error)
+          } else {
+            self.status = 200
+            self.responseText = data
+            setState(self.DONE)
+          }
+        })
+      } else {
+        try {
+          this.responseText = fs.readFileSync(url.pathname, 'utf8')
+          this.status = 200
+          setState(self.DONE)
+        } catch (e) {
+          this.handleError(e)
+        }
+      }
+
+      return
+    }
+
+    // Default to port 80. If accessing localhost on another port be sure
+    // to use http://localhost:port/path
+    const port = url.port || (ssl ? 443 : 80)
+    // Add query string if one is used
+    const uri = url.pathname + (url.search ? url.search : '')
+
+    // Set the Host header or the server may reject the request
+    headers.Host = host
+    if (!((ssl && port === 443) || port === 80)) {
+      headers.Host += ':' + url.port
+    }
+
+    // Set Basic Auth if necessary
+    if (settings.user) {
+      if (typeof settings.password === 'undefined') {
+        settings.password = ''
+      }
+      const authBuf = Buffer.from(settings.user + ':' + settings.password)
+      headers.Authorization = 'Basic ' + authBuf.toString('base64')
+    }
+
+    // Set content length header
+    if (settings.method === 'GET' || settings.method === 'HEAD') {
+      data = null
+    } else if (data) {
+      headers['Content-Length'] = Buffer.byteLength(data)
+
+      if (!headers['Content-Type']) {
+        headers['Content-Type'] = 'text/plain;charset=UTF-8'
+      }
+    } else if (settings.method === 'POST') {
+      // For a post with no data set Content-Length: 0.
+      // This is required by buggy servers that don't meet the specs.
+      headers['Content-Length'] = 0
+    }
+
+    const options = {
+      host: host,
+      port: port,
+      path: uri,
+      method: settings.method,
+      headers: headers,
+    }
+
+    // Reset error flag
+    errorFlag = false
+
+    // Handle async requests
+    if (settings.async) {
+      // Use the proper protocol
+      const doRequest = ssl ? https.request : http.request
+
+      // Request is being sent, set send flag
+      sendFlag = true
+
+      // As per spec, this is called here for historical reasons.
+      self.dispatchEvent('readystatechange')
+
+      // Create the request
+      request = doRequest(options, resp => {
+        response = resp
+        response.setEncoding('utf8')
+
+        setState(self.HEADERS_RECEIVED)
+        self.status = response.statusCode
+
+        response.on('data', chunk => {
+          // Make sure there's some data
+          if (chunk) {
+            self.responseText += chunk
+          }
+          // Don't emit state changes if the connection has been aborted.
+          if (sendFlag) {
+            setState(self.LOADING)
+          }
+        })
+
+        response.on('end', () => {
+          if (sendFlag) {
+            // Discard the 'end' event if the connection has been aborted
+            setState(self.DONE)
+            sendFlag = false
+          }
+        })
+
+        response.on('error', error => {
+          self.handleError(error)
+        })
+      }).on('error', error => {
+        self.handleError(error)
+      })
+
+      // Node 0.4 and later won't accept empty data. Make sure it's needed.
+      if (data) {
+        request.write(data)
+      }
+
+      request.end()
+
+      self.dispatchEvent('loadstart')
+    } else {
+      // Synchronous
+      // Create a temporary file for communication with the other Node process
+      const syncFile = '.node-xmlhttprequest-sync-' + process.pid
+      fs.writeFileSync(syncFile, '', 'utf8')
+      // The async request the other Node process executes
+      const execString =
+        "var http = require('http'), https = require('https'), fs = require('fs');" +
+        'var doRequest = http' +
+        (ssl ? 's' : '') +
+        '.request;' +
+        'var options = ' +
+        JSON.stringify(options) +
+        ';' +
+        "var responseText = '';" +
+        'var req = doRequest(options, function(response) {' +
+        "response.setEncoding('utf8');" +
+        "response.on('data', function(chunk) {" +
+        'responseText += chunk;' +
+        '});' +
+        "response.on('end', function() {" +
+        "fs.writeFileSync('" +
+        syncFile +
+        "', 'NODE-XMLHTTPREQUEST-STATUS:' + response.statusCode + ',' + responseText, 'utf8');" +
+        '});' +
+        "response.on('error', function(error) {" +
+        "fs.writeFileSync('" +
+        syncFile +
+        "', 'NODE-XMLHTTPREQUEST-ERROR:' + JSON.stringify(error), 'utf8');" +
+        '});' +
+        "}).on('error', function(error) {" +
+        "fs.writeFileSync('" +
+        syncFile +
+        "', 'NODE-XMLHTTPREQUEST-ERROR:' + JSON.stringify(error), 'utf8');" +
+        '});' +
+        (data ? "req.write('" + data.replace(/'/g, "\\'") + "');" : '') +
+        'req.end();'
+      // Start the other Node Process, executing this string
+      const syncProc = spawn(process.argv[0], ['-e', execString])
+      while ((self.responseText = fs.readFileSync(syncFile, 'utf8')) === '') {
+        // Wait while the file is empty
+      }
+      // Kill the child process once the file has data
+      syncProc.stdin.end()
+      // Remove the temporary file
+      fs.unlinkSync(syncFile)
+      if (self.responseText.match(/^NODE-XMLHTTPREQUEST-ERROR:/)) {
+        // If the file returned an error, handle it
+        const errorObj = self.responseText.replace(
+          /^NODE-XMLHTTPREQUEST-ERROR:/,
+          ''
+        )
+        self.handleError(errorObj)
+      } else {
+        // If the file returned okay, parse its data and move to the DONE state
+        self.status = self.responseText.replace(
+          /^NODE-XMLHTTPREQUEST-STATUS:([0-9]*),.*/,
+          '$1'
+        )
+        self.responseText = self.responseText.replace(
+          /^NODE-XMLHTTPREQUEST-STATUS:[0-9]*,(.*)/,
+          '$1'
+        )
+        setState(self.DONE)
+      }
+    }
+  }
+
+  /**
+   * Called when an error is encountered to deal with it.
+   */
+  this.handleError = function (error) {
+    this.status = 503
+    this.statusText = error
+    this.responseText = error.stack
+    errorFlag = true
+    setState(this.DONE)
+  }
+
+  /**
+   * Aborts a request.
+   */
+  this.abort = function () {
+    if (request) {
+      request.abort()
+      request = null
+    }
+
+    headers = defaultHeaders
+    this.responseText = ''
+    this.responseXML = ''
+
+    errorFlag = true
+
+    if (
+      this.readyState !== this.UNSENT &&
+      (this.readyState !== this.OPENED || sendFlag) &&
+      this.readyState !== this.DONE
+    ) {
+      sendFlag = false
+      setState(this.DONE)
+    }
+    this.readyState = this.UNSENT
+  }
+
+  /**
+   * Adds an event listener. Preferred method of binding to events.
+   */
+  this.addEventListener = function (event, callback) {
+    if (!(event in listeners)) {
+      listeners[event] = []
+    }
+    // Currently allows duplicate callbacks. Should it?
+    listeners[event].push(callback)
+  }
+
+  /**
+   * Remove an event callback that has already been bound.
+   * Only works on the matching funciton, cannot be a copy.
+   */
+  this.removeEventListener = function (event, callback) {
+    if (event in listeners) {
+      // Filter will return a new array with the callback removed
+      listeners[event] = listeners[event].filter(ev => {
+        return ev !== callback
+      })
+    }
+  }
+
+  /**
+   * Dispatch any events, including both "on" methods and events attached using addEventListener.
+   */
+  this.dispatchEvent = function (event) {
+    if (typeof self['on' + event] === 'function') {
+      self['on' + event]()
+    }
+    if (event in listeners) {
+      for (let i = 0, len = listeners[event].length; i < len; i++) {
+        listeners[event][i].call(self)
+      }
+    }
+  }
+
+  /**
+   * Changes readyState and calls onreadystatechange.
+   *
+   * @param int state New state
+   */
+  var setState = function (state) {
+    if (self.readyState !== state) {
+      self.readyState = state
+
+      if (
+        settings.async ||
+        self.readyState < self.OPENED ||
+        self.readyState === self.DONE
+      ) {
+        self.dispatchEvent('readystatechange')
+      }
+
+      if (self.readyState === self.DONE && !errorFlag) {
+        self.dispatchEvent('load')
+        // @TODO figure out InspectorInstrumentation::didLoadXHR(cookie)
+        self.dispatchEvent('loadend')
+      }
+    }
+  }
+}

services/real-time/test/acceptance/scripts/full-test.sh

@@ -0,0 +1,23 @@
+#! /usr/bin/env bash
+
+# npm rebuild
+
+echo ">> Starting server..."
+
+grunt --no-color forever:app:start
+
+echo ">> Server started"
+
+sleep 5
+
+echo ">> Running acceptance tests..."
+grunt --no-color mochaTest:acceptance
+_test_exit_code=$?
+
+echo ">> Killing server"
+
+grunt --no-color forever:app:stop
+
+echo ">> Done"
+
+exit $_test_exit_code

services/real-time/test/setup.js

@@ -0,0 +1,38 @@
+const chai = require('chai')
+const SandboxedModule = require('sandboxed-module')
+const sinon = require('sinon')
+
+// Chai configuration
+chai.should()
+
+// Global stubs
+const sandbox = sinon.createSandbox()
+const stubs = {
+  logger: {
+    debug: sandbox.stub(),
+    log: sandbox.stub(),
+    info: sandbox.stub(),
+    warn: sandbox.stub(),
+    err: sandbox.stub(),
+    error: sandbox.stub(),
+  },
+}
+
+// SandboxedModule configuration
+SandboxedModule.configure({
+  requires: {
+    'logger-sharelatex': stubs.logger,
+  },
+  globals: { Buffer, JSON, console, process },
+})
+
+// Mocha hooks
+exports.mochaHooks = {
+  beforeEach() {
+    this.logger = stubs.logger
+  },
+
+  afterEach() {
+    sandbox.reset()
+  },
+}

services/real-time/test/unit/js/AuthorizationManagerTests.js

@@ -0,0 +1,318 @@
+/* eslint-disable
+    no-return-assign,
+    no-unused-vars,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const { expect } = require('chai')
+const sinon = require('sinon')
+const SandboxedModule = require('sandboxed-module')
+const path = require('path')
+const modulePath = '../../../app/js/AuthorizationManager'
+
+describe('AuthorizationManager', function () {
+  beforeEach(function () {
+    this.client = { ol_context: {} }
+
+    return (this.AuthorizationManager = SandboxedModule.require(modulePath, {
+      requires: {},
+    }))
+  })
+
+  describe('assertClientCanViewProject', function () {
+    it('should allow the readOnly privilegeLevel', function (done) {
+      this.client.ol_context.privilege_level = 'readOnly'
+      return this.AuthorizationManager.assertClientCanViewProject(
+        this.client,
+        error => {
+          expect(error).to.be.null
+          return done()
+        }
+      )
+    })
+
+    it('should allow the readAndWrite privilegeLevel', function (done) {
+      this.client.ol_context.privilege_level = 'readAndWrite'
+      return this.AuthorizationManager.assertClientCanViewProject(
+        this.client,
+        error => {
+          expect(error).to.be.null
+          return done()
+        }
+      )
+    })
+
+    it('should allow the owner privilegeLevel', function (done) {
+      this.client.ol_context.privilege_level = 'owner'
+      return this.AuthorizationManager.assertClientCanViewProject(
+        this.client,
+        error => {
+          expect(error).to.be.null
+          return done()
+        }
+      )
+    })
+
+    return it('should return an error with any other privilegeLevel', function (done) {
+      this.client.ol_context.privilege_level = 'unknown'
+      return this.AuthorizationManager.assertClientCanViewProject(
+        this.client,
+        error => {
+          error.message.should.equal('not authorized')
+          return done()
+        }
+      )
+    })
+  })
+
+  describe('assertClientCanEditProject', function () {
+    it('should not allow the readOnly privilegeLevel', function (done) {
+      this.client.ol_context.privilege_level = 'readOnly'
+      return this.AuthorizationManager.assertClientCanEditProject(
+        this.client,
+        error => {
+          error.message.should.equal('not authorized')
+          return done()
+        }
+      )
+    })
+
+    it('should allow the readAndWrite privilegeLevel', function (done) {
+      this.client.ol_context.privilege_level = 'readAndWrite'
+      return this.AuthorizationManager.assertClientCanEditProject(
+        this.client,
+        error => {
+          expect(error).to.be.null
+          return done()
+        }
+      )
+    })
+
+    it('should allow the owner privilegeLevel', function (done) {
+      this.client.ol_context.privilege_level = 'owner'
+      return this.AuthorizationManager.assertClientCanEditProject(
+        this.client,
+        error => {
+          expect(error).to.be.null
+          return done()
+        }
+      )
+    })
+
+    return it('should return an error with any other privilegeLevel', function (done) {
+      this.client.ol_context.privilege_level = 'unknown'
+      return this.AuthorizationManager.assertClientCanEditProject(
+        this.client,
+        error => {
+          error.message.should.equal('not authorized')
+          return done()
+        }
+      )
+    })
+  })
+
+  // check doc access for project
+
+  describe('assertClientCanViewProjectAndDoc', function () {
+    beforeEach(function () {
+      this.doc_id = '12345'
+      this.callback = sinon.stub()
+      return (this.client.ol_context = {})
+    })
+
+    describe('when not authorised at the project level', function () {
+      beforeEach(function () {
+        return (this.client.ol_context.privilege_level = 'unknown')
+      })
+
+      it('should not allow access', function () {
+        return this.AuthorizationManager.assertClientCanViewProjectAndDoc(
+          this.client,
+          this.doc_id,
+          err => err.message.should.equal('not authorized')
+        )
+      })
+
+      return describe('even when authorised at the doc level', function () {
+        beforeEach(function (done) {
+          return this.AuthorizationManager.addAccessToDoc(
+            this.client,
+            this.doc_id,
+            done
+          )
+        })
+
+        return it('should not allow access', function () {
+          return this.AuthorizationManager.assertClientCanViewProjectAndDoc(
+            this.client,
+            this.doc_id,
+            err => err.message.should.equal('not authorized')
+          )
+        })
+      })
+    })
+
+    return describe('when authorised at the project level', function () {
+      beforeEach(function () {
+        return (this.client.ol_context.privilege_level = 'readOnly')
+      })
+
+      describe('and not authorised at the document level', function () {
+        return it('should not allow access', function () {
+          return this.AuthorizationManager.assertClientCanViewProjectAndDoc(
+            this.client,
+            this.doc_id,
+            err => err.message.should.equal('not authorized')
+          )
+        })
+      })
+
+      describe('and authorised at the document level', function () {
+        beforeEach(function (done) {
+          return this.AuthorizationManager.addAccessToDoc(
+            this.client,
+            this.doc_id,
+            done
+          )
+        })
+
+        return it('should allow access', function () {
+          this.AuthorizationManager.assertClientCanViewProjectAndDoc(
+            this.client,
+            this.doc_id,
+            this.callback
+          )
+          return this.callback.calledWith(null).should.equal(true)
+        })
+      })
+
+      return describe('when document authorisation is added and then removed', function () {
+        beforeEach(function (done) {
+          return this.AuthorizationManager.addAccessToDoc(
+            this.client,
+            this.doc_id,
+            () => {
+              return this.AuthorizationManager.removeAccessToDoc(
+                this.client,
+                this.doc_id,
+                done
+              )
+            }
+          )
+        })
+
+        return it('should deny access', function () {
+          return this.AuthorizationManager.assertClientCanViewProjectAndDoc(
+            this.client,
+            this.doc_id,
+            err => err.message.should.equal('not authorized')
+          )
+        })
+      })
+    })
+  })
+
+  return describe('assertClientCanEditProjectAndDoc', function () {
+    beforeEach(function () {
+      this.doc_id = '12345'
+      this.callback = sinon.stub()
+      return (this.client.ol_context = {})
+    })
+
+    describe('when not authorised at the project level', function () {
+      beforeEach(function () {
+        return (this.client.ol_context.privilege_level = 'readOnly')
+      })
+
+      it('should not allow access', function () {
+        return this.AuthorizationManager.assertClientCanEditProjectAndDoc(
+          this.client,
+          this.doc_id,
+          err => err.message.should.equal('not authorized')
+        )
+      })
+
+      return describe('even when authorised at the doc level', function () {
+        beforeEach(function (done) {
+          return this.AuthorizationManager.addAccessToDoc(
+            this.client,
+            this.doc_id,
+            done
+          )
+        })
+
+        return it('should not allow access', function () {
+          return this.AuthorizationManager.assertClientCanEditProjectAndDoc(
+            this.client,
+            this.doc_id,
+            err => err.message.should.equal('not authorized')
+          )
+        })
+      })
+    })
+
+    return describe('when authorised at the project level', function () {
+      beforeEach(function () {
+        return (this.client.ol_context.privilege_level = 'readAndWrite')
+      })
+
+      describe('and not authorised at the document level', function () {
+        return it('should not allow access', function () {
+          return this.AuthorizationManager.assertClientCanEditProjectAndDoc(
+            this.client,
+            this.doc_id,
+            err => err.message.should.equal('not authorized')
+          )
+        })
+      })
+
+      describe('and authorised at the document level', function () {
+        beforeEach(function (done) {
+          return this.AuthorizationManager.addAccessToDoc(
+            this.client,
+            this.doc_id,
+            done
+          )
+        })
+
+        return it('should allow access', function () {
+          this.AuthorizationManager.assertClientCanEditProjectAndDoc(
+            this.client,
+            this.doc_id,
+            this.callback
+          )
+          return this.callback.calledWith(null).should.equal(true)
+        })
+      })
+
+      return describe('when document authorisation is added and then removed', function () {
+        beforeEach(function (done) {
+          return this.AuthorizationManager.addAccessToDoc(
+            this.client,
+            this.doc_id,
+            () => {
+              return this.AuthorizationManager.removeAccessToDoc(
+                this.client,
+                this.doc_id,
+                done
+              )
+            }
+          )
+        })
+
+        return it('should deny access', function () {
+          return this.AuthorizationManager.assertClientCanEditProjectAndDoc(
+            this.client,
+            this.doc_id,
+            err => err.message.should.equal('not authorized')
+          )
+        })
+      })
+    })
+  })
+})

services/real-time/test/unit/js/ChannelManagerTests.js

@@ -0,0 +1,432 @@
+/* eslint-disable
+    no-return-assign,
+    no-unused-vars,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const { expect } = require('chai')
+const sinon = require('sinon')
+const modulePath = '../../../app/js/ChannelManager.js'
+const SandboxedModule = require('sandboxed-module')
+
+describe('ChannelManager', function () {
+  beforeEach(function () {
+    this.rclient = {}
+    this.other_rclient = {}
+    return (this.ChannelManager = SandboxedModule.require(modulePath, {
+      requires: {
+        '@overleaf/settings': (this.settings = {}),
+        '@overleaf/metrics': (this.metrics = {
+          inc: sinon.stub(),
+          summary: sinon.stub(),
+        }),
+      },
+    }))
+  })
+
+  describe('subscribe', function () {
+    describe('when there is no existing subscription for this redis client', function () {
+      beforeEach(function (done) {
+        this.rclient.subscribe = sinon.stub().resolves()
+        this.ChannelManager.subscribe(
+          this.rclient,
+          'applied-ops',
+          '1234567890abcdef'
+        )
+        return setTimeout(done)
+      })
+
+      return it('should subscribe to the redis channel', function () {
+        return this.rclient.subscribe
+          .calledWithExactly('applied-ops:1234567890abcdef')
+          .should.equal(true)
+      })
+    })
+
+    describe('when there is an existing subscription for this redis client', function () {
+      beforeEach(function (done) {
+        this.rclient.subscribe = sinon.stub().resolves()
+        this.ChannelManager.subscribe(
+          this.rclient,
+          'applied-ops',
+          '1234567890abcdef'
+        )
+        this.ChannelManager.subscribe(
+          this.rclient,
+          'applied-ops',
+          '1234567890abcdef'
+        )
+        return setTimeout(done)
+      })
+
+      return it('should subscribe to the redis channel again', function () {
+        return this.rclient.subscribe.callCount.should.equal(2)
+      })
+    })
+
+    describe('when subscribe errors', function () {
+      beforeEach(function (done) {
+        this.rclient.subscribe = sinon
+          .stub()
+          .onFirstCall()
+          .rejects(new Error('some redis error'))
+          .onSecondCall()
+          .resolves()
+        const p = this.ChannelManager.subscribe(
+          this.rclient,
+          'applied-ops',
+          '1234567890abcdef'
+        )
+        p.then(() => done(new Error('should not subscribe but fail'))).catch(
+          err => {
+            err.message.should.equal('failed to subscribe to channel')
+            err.cause.message.should.equal('some redis error')
+            this.ChannelManager.getClientMapEntry(this.rclient)
+              .has('applied-ops:1234567890abcdef')
+              .should.equal(false)
+            this.ChannelManager.subscribe(
+              this.rclient,
+              'applied-ops',
+              '1234567890abcdef'
+            )
+            // subscribe is wrapped in Promise, delay other assertions
+            return setTimeout(done)
+          }
+        )
+        return null
+      })
+
+      it('should have recorded the error', function () {
+        return expect(
+          this.metrics.inc.calledWithExactly('subscribe.failed.applied-ops')
+        ).to.equal(true)
+      })
+
+      it('should subscribe again', function () {
+        return this.rclient.subscribe.callCount.should.equal(2)
+      })
+
+      return it('should cleanup', function () {
+        return this.ChannelManager.getClientMapEntry(this.rclient)
+          .has('applied-ops:1234567890abcdef')
+          .should.equal(false)
+      })
+    })
+
+    describe('when subscribe errors and the clientChannelMap entry was replaced', function () {
+      beforeEach(function (done) {
+        this.rclient.subscribe = sinon
+          .stub()
+          .onFirstCall()
+          .rejects(new Error('some redis error'))
+          .onSecondCall()
+          .resolves()
+        this.first = this.ChannelManager.subscribe(
+          this.rclient,
+          'applied-ops',
+          '1234567890abcdef'
+        )
+        // ignore error
+        this.first.catch(() => {})
+        expect(
+          this.ChannelManager.getClientMapEntry(this.rclient).get(
+            'applied-ops:1234567890abcdef'
+          )
+        ).to.equal(this.first)
+
+        this.rclient.unsubscribe = sinon.stub().resolves()
+        this.ChannelManager.unsubscribe(
+          this.rclient,
+          'applied-ops',
+          '1234567890abcdef'
+        )
+        this.second = this.ChannelManager.subscribe(
+          this.rclient,
+          'applied-ops',
+          '1234567890abcdef'
+        )
+        // should get replaced immediately
+        expect(
+          this.ChannelManager.getClientMapEntry(this.rclient).get(
+            'applied-ops:1234567890abcdef'
+          )
+        ).to.equal(this.second)
+
+        // let the first subscribe error -> unsubscribe -> subscribe
+        return setTimeout(done)
+      })
+
+      return it('should cleanup the second subscribePromise', function () {
+        return expect(
+          this.ChannelManager.getClientMapEntry(this.rclient).has(
+            'applied-ops:1234567890abcdef'
+          )
+        ).to.equal(false)
+      })
+    })
+
+    return describe('when there is an existing subscription for another redis client but not this one', function () {
+      beforeEach(function (done) {
+        this.other_rclient.subscribe = sinon.stub().resolves()
+        this.ChannelManager.subscribe(
+          this.other_rclient,
+          'applied-ops',
+          '1234567890abcdef'
+        )
+        this.rclient.subscribe = sinon.stub().resolves() // discard the original stub
+        this.ChannelManager.subscribe(
+          this.rclient,
+          'applied-ops',
+          '1234567890abcdef'
+        )
+        return setTimeout(done)
+      })
+
+      return it('should subscribe to the redis channel on this redis client', function () {
+        return this.rclient.subscribe
+          .calledWithExactly('applied-ops:1234567890abcdef')
+          .should.equal(true)
+      })
+    })
+  })
+
+  describe('unsubscribe', function () {
+    describe('when there is no existing subscription for this redis client', function () {
+      beforeEach(function (done) {
+        this.rclient.unsubscribe = sinon.stub().resolves()
+        this.ChannelManager.unsubscribe(
+          this.rclient,
+          'applied-ops',
+          '1234567890abcdef'
+        )
+        return setTimeout(done)
+      })
+
+      return it('should unsubscribe from the redis channel', function () {
+        return this.rclient.unsubscribe.called.should.equal(true)
+      })
+    })
+
+    describe('when there is an existing subscription for this another redis client but not this one', function () {
+      beforeEach(function (done) {
+        this.other_rclient.subscribe = sinon.stub().resolves()
+        this.rclient.unsubscribe = sinon.stub().resolves()
+        this.ChannelManager.subscribe(
+          this.other_rclient,
+          'applied-ops',
+          '1234567890abcdef'
+        )
+        this.ChannelManager.unsubscribe(
+          this.rclient,
+          'applied-ops',
+          '1234567890abcdef'
+        )
+        return setTimeout(done)
+      })
+
+      return it('should still unsubscribe from the redis channel on this client', function () {
+        return this.rclient.unsubscribe.called.should.equal(true)
+      })
+    })
+
+    describe('when unsubscribe errors and completes', function () {
+      beforeEach(function (done) {
+        this.rclient.subscribe = sinon.stub().resolves()
+        this.ChannelManager.subscribe(
+          this.rclient,
+          'applied-ops',
+          '1234567890abcdef'
+        )
+        this.rclient.unsubscribe = sinon
+          .stub()
+          .rejects(new Error('some redis error'))
+        this.ChannelManager.unsubscribe(
+          this.rclient,
+          'applied-ops',
+          '1234567890abcdef'
+        )
+        setTimeout(done)
+        return null
+      })
+
+      it('should have cleaned up', function () {
+        return this.ChannelManager.getClientMapEntry(this.rclient)
+          .has('applied-ops:1234567890abcdef')
+          .should.equal(false)
+      })
+
+      return it('should not error out when subscribing again', function (done) {
+        const p = this.ChannelManager.subscribe(
+          this.rclient,
+          'applied-ops',
+          '1234567890abcdef'
+        )
+        p.then(() => done()).catch(done)
+        return null
+      })
+    })
+
+    describe('when unsubscribe errors and another client subscribes at the same time', function () {
+      beforeEach(function (done) {
+        this.rclient.subscribe = sinon.stub().resolves()
+        this.ChannelManager.subscribe(
+          this.rclient,
+          'applied-ops',
+          '1234567890abcdef'
+        )
+        let rejectSubscribe
+        this.rclient.unsubscribe = () =>
+          new Promise((resolve, reject) => (rejectSubscribe = reject))
+        this.ChannelManager.unsubscribe(
+          this.rclient,
+          'applied-ops',
+          '1234567890abcdef'
+        )
+
+        setTimeout(() => {
+          // delay, actualUnsubscribe should not see the new subscribe request
+          this.ChannelManager.subscribe(
+            this.rclient,
+            'applied-ops',
+            '1234567890abcdef'
+          )
+            .then(() => setTimeout(done))
+            .catch(done)
+          return setTimeout(() =>
+            // delay, rejectSubscribe is not defined immediately
+            rejectSubscribe(new Error('redis error'))
+          )
+        })
+        return null
+      })
+
+      it('should have recorded the error', function () {
+        return expect(
+          this.metrics.inc.calledWithExactly('unsubscribe.failed.applied-ops')
+        ).to.equal(true)
+      })
+
+      it('should have subscribed', function () {
+        return this.rclient.subscribe.called.should.equal(true)
+      })
+
+      return it('should have discarded the finished Promise', function () {
+        return this.ChannelManager.getClientMapEntry(this.rclient)
+          .has('applied-ops:1234567890abcdef')
+          .should.equal(false)
+      })
+    })
+
+    return describe('when there is an existing subscription for this redis client', function () {
+      beforeEach(function (done) {
+        this.rclient.subscribe = sinon.stub().resolves()
+        this.rclient.unsubscribe = sinon.stub().resolves()
+        this.ChannelManager.subscribe(
+          this.rclient,
+          'applied-ops',
+          '1234567890abcdef'
+        )
+        this.ChannelManager.unsubscribe(
+          this.rclient,
+          'applied-ops',
+          '1234567890abcdef'
+        )
+        return setTimeout(done)
+      })
+
+      return it('should unsubscribe from the redis channel', function () {
+        return this.rclient.unsubscribe
+          .calledWithExactly('applied-ops:1234567890abcdef')
+          .should.equal(true)
+      })
+    })
+  })
+
+  return describe('publish', function () {
+    describe("when the channel is 'all'", function () {
+      beforeEach(function () {
+        this.rclient.publish = sinon.stub()
+        return this.ChannelManager.publish(
+          this.rclient,
+          'applied-ops',
+          'all',
+          'random-message'
+        )
+      })
+
+      return it('should publish on the base channel', function () {
+        return this.rclient.publish
+          .calledWithExactly('applied-ops', 'random-message')
+          .should.equal(true)
+      })
+    })
+
+    describe('when the channel has an specific id', function () {
+      describe('when the individual channel setting is false', function () {
+        beforeEach(function () {
+          this.rclient.publish = sinon.stub()
+          this.settings.publishOnIndividualChannels = false
+          return this.ChannelManager.publish(
+            this.rclient,
+            'applied-ops',
+            '1234567890abcdef',
+            'random-message'
+          )
+        })
+
+        return it('should publish on the per-id channel', function () {
+          this.rclient.publish
+            .calledWithExactly('applied-ops', 'random-message')
+            .should.equal(true)
+          return this.rclient.publish.calledOnce.should.equal(true)
+        })
+      })
+
+      return describe('when the individual channel setting is true', function () {
+        beforeEach(function () {
+          this.rclient.publish = sinon.stub()
+          this.settings.publishOnIndividualChannels = true
+          return this.ChannelManager.publish(
+            this.rclient,
+            'applied-ops',
+            '1234567890abcdef',
+            'random-message'
+          )
+        })
+
+        return it('should publish on the per-id channel', function () {
+          this.rclient.publish
+            .calledWithExactly('applied-ops:1234567890abcdef', 'random-message')
+            .should.equal(true)
+          return this.rclient.publish.calledOnce.should.equal(true)
+        })
+      })
+    })
+
+    return describe('metrics', function () {
+      beforeEach(function () {
+        this.rclient.publish = sinon.stub()
+        return this.ChannelManager.publish(
+          this.rclient,
+          'applied-ops',
+          'all',
+          'random-message'
+        )
+      })
+
+      return it('should track the payload size', function () {
+        return this.metrics.summary
+          .calledWithExactly(
+            'redis.publish.applied-ops',
+            'random-message'.length
+          )
+          .should.equal(true)
+      })
+    })
+  })
+})

services/real-time/test/unit/js/ConnectedUsersManagerTests.js

@@ -0,0 +1,407 @@
+/* eslint-disable
+    camelcase,
+    handle-callback-err,
+    no-return-assign,
+    no-unused-vars,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+
+const SandboxedModule = require('sandboxed-module')
+const assert = require('assert')
+const path = require('path')
+const sinon = require('sinon')
+const modulePath = path.join(__dirname, '../../../app/js/ConnectedUsersManager')
+const { expect } = require('chai')
+const tk = require('timekeeper')
+
+describe('ConnectedUsersManager', function () {
+  beforeEach(function () {
+    this.settings = {
+      redis: {
+        realtime: {
+          key_schema: {
+            clientsInProject({ project_id }) {
+              return `clients_in_project:${project_id}`
+            },
+            connectedUser({ project_id, client_id }) {
+              return `connected_user:${project_id}:${client_id}`
+            },
+          },
+        },
+      },
+    }
+    this.rClient = {
+      auth() {},
+      setex: sinon.stub(),
+      sadd: sinon.stub(),
+      get: sinon.stub(),
+      srem: sinon.stub(),
+      del: sinon.stub(),
+      smembers: sinon.stub(),
+      expire: sinon.stub(),
+      hset: sinon.stub(),
+      hgetall: sinon.stub(),
+      exec: sinon.stub(),
+      multi: () => {
+        return this.rClient
+      },
+    }
+    tk.freeze(new Date())
+
+    this.ConnectedUsersManager = SandboxedModule.require(modulePath, {
+      requires: {
+        '@overleaf/settings': this.settings,
+        '@overleaf/redis-wrapper': {
+          createClient: () => {
+            return this.rClient
+          },
+        },
+      },
+    })
+    this.client_id = '32132132'
+    this.project_id = 'dskjh2u21321'
+    this.user = {
+      _id: 'user-id-123',
+      first_name: 'Joe',
+      last_name: 'Bloggs',
+      email: 'joe@example.com',
+    }
+    return (this.cursorData = {
+      row: 12,
+      column: 9,
+      doc_id: '53c3b8c85fee64000023dc6e',
+    })
+  })
+
+  afterEach(function () {
+    return tk.reset()
+  })
+
+  describe('updateUserPosition', function () {
+    beforeEach(function () {
+      return this.rClient.exec.callsArgWith(0)
+    })
+
+    it('should set a key with the date and give it a ttl', function (done) {
+      return this.ConnectedUsersManager.updateUserPosition(
+        this.project_id,
+        this.client_id,
+        this.user,
+        null,
+        err => {
+          this.rClient.hset
+            .calledWith(
+              `connected_user:${this.project_id}:${this.client_id}`,
+              'last_updated_at',
+              Date.now()
+            )
+            .should.equal(true)
+          return done()
+        }
+      )
+    })
+
+    it('should set a key with the user_id', function (done) {
+      return this.ConnectedUsersManager.updateUserPosition(
+        this.project_id,
+        this.client_id,
+        this.user,
+        null,
+        err => {
+          this.rClient.hset
+            .calledWith(
+              `connected_user:${this.project_id}:${this.client_id}`,
+              'user_id',
+              this.user._id
+            )
+            .should.equal(true)
+          return done()
+        }
+      )
+    })
+
+    it('should set a key with the first_name', function (done) {
+      return this.ConnectedUsersManager.updateUserPosition(
+        this.project_id,
+        this.client_id,
+        this.user,
+        null,
+        err => {
+          this.rClient.hset
+            .calledWith(
+              `connected_user:${this.project_id}:${this.client_id}`,
+              'first_name',
+              this.user.first_name
+            )
+            .should.equal(true)
+          return done()
+        }
+      )
+    })
+
+    it('should set a key with the last_name', function (done) {
+      return this.ConnectedUsersManager.updateUserPosition(
+        this.project_id,
+        this.client_id,
+        this.user,
+        null,
+        err => {
+          this.rClient.hset
+            .calledWith(
+              `connected_user:${this.project_id}:${this.client_id}`,
+              'last_name',
+              this.user.last_name
+            )
+            .should.equal(true)
+          return done()
+        }
+      )
+    })
+
+    it('should set a key with the email', function (done) {
+      return this.ConnectedUsersManager.updateUserPosition(
+        this.project_id,
+        this.client_id,
+        this.user,
+        null,
+        err => {
+          this.rClient.hset
+            .calledWith(
+              `connected_user:${this.project_id}:${this.client_id}`,
+              'email',
+              this.user.email
+            )
+            .should.equal(true)
+          return done()
+        }
+      )
+    })
+
+    it('should push the client_id on to the project list', function (done) {
+      return this.ConnectedUsersManager.updateUserPosition(
+        this.project_id,
+        this.client_id,
+        this.user,
+        null,
+        err => {
+          this.rClient.sadd
+            .calledWith(`clients_in_project:${this.project_id}`, this.client_id)
+            .should.equal(true)
+          return done()
+        }
+      )
+    })
+
+    it('should add a ttl to the project set so it stays clean', function (done) {
+      return this.ConnectedUsersManager.updateUserPosition(
+        this.project_id,
+        this.client_id,
+        this.user,
+        null,
+        err => {
+          this.rClient.expire
+            .calledWith(
+              `clients_in_project:${this.project_id}`,
+              24 * 4 * 60 * 60
+            )
+            .should.equal(true)
+          return done()
+        }
+      )
+    })
+
+    it('should add a ttl to the connected user so it stays clean', function (done) {
+      return this.ConnectedUsersManager.updateUserPosition(
+        this.project_id,
+        this.client_id,
+        this.user,
+        null,
+        err => {
+          this.rClient.expire
+            .calledWith(
+              `connected_user:${this.project_id}:${this.client_id}`,
+              60 * 15
+            )
+            .should.equal(true)
+          return done()
+        }
+      )
+    })
+
+    return it('should set the cursor position when provided', function (done) {
+      return this.ConnectedUsersManager.updateUserPosition(
+        this.project_id,
+        this.client_id,
+        this.user,
+        this.cursorData,
+        err => {
+          this.rClient.hset
+            .calledWith(
+              `connected_user:${this.project_id}:${this.client_id}`,
+              'cursorData',
+              JSON.stringify(this.cursorData)
+            )
+            .should.equal(true)
+          return done()
+        }
+      )
+    })
+  })
+
+  describe('markUserAsDisconnected', function () {
+    beforeEach(function () {
+      return this.rClient.exec.callsArgWith(0)
+    })
+
+    it('should remove the user from the set', function (done) {
+      return this.ConnectedUsersManager.markUserAsDisconnected(
+        this.project_id,
+        this.client_id,
+        err => {
+          this.rClient.srem
+            .calledWith(`clients_in_project:${this.project_id}`, this.client_id)
+            .should.equal(true)
+          return done()
+        }
+      )
+    })
+
+    it('should delete the connected_user string', function (done) {
+      return this.ConnectedUsersManager.markUserAsDisconnected(
+        this.project_id,
+        this.client_id,
+        err => {
+          this.rClient.del
+            .calledWith(`connected_user:${this.project_id}:${this.client_id}`)
+            .should.equal(true)
+          return done()
+        }
+      )
+    })
+
+    return it('should add a ttl to the connected user set so it stays clean', function (done) {
+      return this.ConnectedUsersManager.markUserAsDisconnected(
+        this.project_id,
+        this.client_id,
+        err => {
+          this.rClient.expire
+            .calledWith(
+              `clients_in_project:${this.project_id}`,
+              24 * 4 * 60 * 60
+            )
+            .should.equal(true)
+          return done()
+        }
+      )
+    })
+  })
+
+  describe('_getConnectedUser', function () {
+    it('should return a connected user if there is a user object', function (done) {
+      const cursorData = JSON.stringify({ cursorData: { row: 1 } })
+      this.rClient.hgetall.callsArgWith(1, null, {
+        connected_at: new Date(),
+        user_id: this.user._id,
+        last_updated_at: `${Date.now()}`,
+        cursorData,
+      })
+      return this.ConnectedUsersManager._getConnectedUser(
+        this.project_id,
+        this.client_id,
+        (err, result) => {
+          result.connected.should.equal(true)
+          result.client_id.should.equal(this.client_id)
+          return done()
+        }
+      )
+    })
+
+    it('should return a not connected user if there is no object', function (done) {
+      this.rClient.hgetall.callsArgWith(1, null, null)
+      return this.ConnectedUsersManager._getConnectedUser(
+        this.project_id,
+        this.client_id,
+        (err, result) => {
+          result.connected.should.equal(false)
+          result.client_id.should.equal(this.client_id)
+          return done()
+        }
+      )
+    })
+
+    return it('should return a not connected user if there is an empty object', function (done) {
+      this.rClient.hgetall.callsArgWith(1, null, {})
+      return this.ConnectedUsersManager._getConnectedUser(
+        this.project_id,
+        this.client_id,
+        (err, result) => {
+          result.connected.should.equal(false)
+          result.client_id.should.equal(this.client_id)
+          return done()
+        }
+      )
+    })
+  })
+
+  return describe('getConnectedUsers', function () {
+    beforeEach(function () {
+      this.users = ['1234', '5678', '9123', '8234']
+      this.rClient.smembers.callsArgWith(1, null, this.users)
+      this.ConnectedUsersManager._getConnectedUser = sinon.stub()
+      this.ConnectedUsersManager._getConnectedUser
+        .withArgs(this.project_id, this.users[0])
+        .callsArgWith(2, null, {
+          connected: true,
+          client_age: 2,
+          client_id: this.users[0],
+        })
+      this.ConnectedUsersManager._getConnectedUser
+        .withArgs(this.project_id, this.users[1])
+        .callsArgWith(2, null, {
+          connected: false,
+          client_age: 1,
+          client_id: this.users[1],
+        })
+      this.ConnectedUsersManager._getConnectedUser
+        .withArgs(this.project_id, this.users[2])
+        .callsArgWith(2, null, {
+          connected: true,
+          client_age: 3,
+          client_id: this.users[2],
+        })
+      return this.ConnectedUsersManager._getConnectedUser
+        .withArgs(this.project_id, this.users[3])
+        .callsArgWith(2, null, {
+          connected: true,
+          client_age: 11,
+          client_id: this.users[3],
+        })
+    }) // connected but old
+
+    return it('should only return the users in the list which are still in redis and recently updated', function (done) {
+      return this.ConnectedUsersManager.getConnectedUsers(
+        this.project_id,
+        (err, users) => {
+          users.length.should.equal(2)
+          users[0].should.deep.equal({
+            client_id: this.users[0],
+            client_age: 2,
+            connected: true,
+          })
+          users[1].should.deep.equal({
+            client_id: this.users[2],
+            client_age: 3,
+            connected: true,
+          })
+          return done()
+        }
+      )
+    })
+  })
+})

services/real-time/test/unit/js/DocumentUpdaterControllerTests.js

@@ -0,0 +1,257 @@
+/* eslint-disable
+    camelcase,
+    no-return-assign,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS101: Remove unnecessary use of Array.from
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const SandboxedModule = require('sandboxed-module')
+const sinon = require('sinon')
+const modulePath = require('path').join(
+  __dirname,
+  '../../../app/js/DocumentUpdaterController'
+)
+const MockClient = require('./helpers/MockClient')
+
+describe('DocumentUpdaterController', function () {
+  beforeEach(function () {
+    this.project_id = 'project-id-123'
+    this.doc_id = 'doc-id-123'
+    this.callback = sinon.stub()
+    this.io = { mock: 'socket.io' }
+    this.rclient = []
+    this.RoomEvents = { on: sinon.stub() }
+    this.EditorUpdatesController = SandboxedModule.require(modulePath, {
+      requires: {
+        '@overleaf/settings': (this.settings = {
+          redis: {
+            documentupdater: {
+              key_schema: {
+                pendingUpdates({ doc_id }) {
+                  return `PendingUpdates:${doc_id}`
+                },
+              },
+            },
+            pubsub: null,
+          },
+        }),
+        './RedisClientManager': {
+          createClientList: () => {
+            this.redis = {
+              createClient: name => {
+                let rclientStub
+                this.rclient.push((rclientStub = { name }))
+                return rclientStub
+              },
+            }
+          },
+        },
+        './SafeJsonParse': (this.SafeJsonParse = {
+          parse: (data, cb) => cb(null, JSON.parse(data)),
+        }),
+        './EventLogger': (this.EventLogger = { checkEventOrder: sinon.stub() }),
+        './HealthCheckManager': { check: sinon.stub() },
+        '@overleaf/metrics': (this.metrics = { inc: sinon.stub() }),
+        './RoomManager': (this.RoomManager = {
+          eventSource: sinon.stub().returns(this.RoomEvents),
+        }),
+        './ChannelManager': (this.ChannelManager = {}),
+      },
+    })
+  })
+
+  describe('listenForUpdatesFromDocumentUpdater', function () {
+    beforeEach(function () {
+      this.rclient.length = 0 // clear any existing clients
+      this.EditorUpdatesController.rclientList = [
+        this.redis.createClient('first'),
+        this.redis.createClient('second'),
+      ]
+      this.rclient[0].subscribe = sinon.stub()
+      this.rclient[0].on = sinon.stub()
+      this.rclient[1].subscribe = sinon.stub()
+      this.rclient[1].on = sinon.stub()
+      this.EditorUpdatesController.listenForUpdatesFromDocumentUpdater()
+    })
+
+    it('should subscribe to the doc-updater stream', function () {
+      this.rclient[0].subscribe.calledWith('applied-ops').should.equal(true)
+    })
+
+    it('should register a callback to handle updates', function () {
+      this.rclient[0].on.calledWith('message').should.equal(true)
+    })
+
+    it('should subscribe to any additional doc-updater stream', function () {
+      this.rclient[1].subscribe.calledWith('applied-ops').should.equal(true)
+      this.rclient[1].on.calledWith('message').should.equal(true)
+    })
+  })
+
+  describe('_processMessageFromDocumentUpdater', function () {
+    describe('with bad JSON', function () {
+      beforeEach(function () {
+        this.SafeJsonParse.parse = sinon
+          .stub()
+          .callsArgWith(1, new Error('oops'))
+        return this.EditorUpdatesController._processMessageFromDocumentUpdater(
+          this.io,
+          'applied-ops',
+          'blah'
+        )
+      })
+
+      it('should log an error', function () {
+        return this.logger.error.called.should.equal(true)
+      })
+    })
+
+    describe('with update', function () {
+      beforeEach(function () {
+        this.message = {
+          doc_id: this.doc_id,
+          op: { t: 'foo', p: 12 },
+        }
+        this.EditorUpdatesController._applyUpdateFromDocumentUpdater =
+          sinon.stub()
+        return this.EditorUpdatesController._processMessageFromDocumentUpdater(
+          this.io,
+          'applied-ops',
+          JSON.stringify(this.message)
+        )
+      })
+
+      it('should apply the update', function () {
+        return this.EditorUpdatesController._applyUpdateFromDocumentUpdater
+          .calledWith(this.io, this.doc_id, this.message.op)
+          .should.equal(true)
+      })
+    })
+
+    describe('with error', function () {
+      beforeEach(function () {
+        this.message = {
+          doc_id: this.doc_id,
+          error: 'Something went wrong',
+        }
+        this.EditorUpdatesController._processErrorFromDocumentUpdater =
+          sinon.stub()
+        return this.EditorUpdatesController._processMessageFromDocumentUpdater(
+          this.io,
+          'applied-ops',
+          JSON.stringify(this.message)
+        )
+      })
+
+      return it('should process the error', function () {
+        return this.EditorUpdatesController._processErrorFromDocumentUpdater
+          .calledWith(this.io, this.doc_id, this.message.error)
+          .should.equal(true)
+      })
+    })
+  })
+
+  describe('_applyUpdateFromDocumentUpdater', function () {
+    beforeEach(function () {
+      this.sourceClient = new MockClient()
+      this.otherClients = [new MockClient(), new MockClient()]
+      this.update = {
+        op: [{ t: 'foo', p: 12 }],
+        meta: { source: this.sourceClient.publicId },
+        v: (this.version = 42),
+        doc: this.doc_id,
+      }
+      return (this.io.sockets = {
+        clients: sinon
+          .stub()
+          .returns([
+            this.sourceClient,
+            ...Array.from(this.otherClients),
+            this.sourceClient,
+          ]),
+      })
+    }) // include a duplicate client
+
+    describe('normally', function () {
+      beforeEach(function () {
+        return this.EditorUpdatesController._applyUpdateFromDocumentUpdater(
+          this.io,
+          this.doc_id,
+          this.update
+        )
+      })
+
+      it('should send a version bump to the source client', function () {
+        this.sourceClient.emit
+          .calledWith('otUpdateApplied', { v: this.version, doc: this.doc_id })
+          .should.equal(true)
+        return this.sourceClient.emit.calledOnce.should.equal(true)
+      })
+
+      it('should get the clients connected to the document', function () {
+        return this.io.sockets.clients
+          .calledWith(this.doc_id)
+          .should.equal(true)
+      })
+
+      return it('should send the full update to the other clients', function () {
+        return Array.from(this.otherClients).map(client =>
+          client.emit
+            .calledWith('otUpdateApplied', this.update)
+            .should.equal(true)
+        )
+      })
+    })
+
+    return describe('with a duplicate op', function () {
+      beforeEach(function () {
+        this.update.dup = true
+        return this.EditorUpdatesController._applyUpdateFromDocumentUpdater(
+          this.io,
+          this.doc_id,
+          this.update
+        )
+      })
+
+      it('should send a version bump to the source client as usual', function () {
+        return this.sourceClient.emit
+          .calledWith('otUpdateApplied', { v: this.version, doc: this.doc_id })
+          .should.equal(true)
+      })
+
+      return it("should not send anything to the other clients (they've already had the op)", function () {
+        return Array.from(this.otherClients).map(client =>
+          client.emit.calledWith('otUpdateApplied').should.equal(false)
+        )
+      })
+    })
+  })
+
+  return describe('_processErrorFromDocumentUpdater', function () {
+    beforeEach(function () {
+      this.clients = [new MockClient(), new MockClient()]
+      this.io.sockets = { clients: sinon.stub().returns(this.clients) }
+      return this.EditorUpdatesController._processErrorFromDocumentUpdater(
+        this.io,
+        this.doc_id,
+        'Something went wrong'
+      )
+    })
+
+    it('should log a warning', function () {
+      return this.logger.warn.called.should.equal(true)
+    })
+
+    return it('should disconnect all clients in that document', function () {
+      this.io.sockets.clients.calledWith(this.doc_id).should.equal(true)
+      return Array.from(this.clients).map(client =>
+        client.disconnect.called.should.equal(true)
+      )
+    })
+  })
+})

services/real-time/test/unit/js/DocumentUpdaterManagerTests.js

@@ -0,0 +1,424 @@
+/* eslint-disable
+    camelcase,
+    no-return-assign,
+    no-unused-vars,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const sinon = require('sinon')
+const SandboxedModule = require('sandboxed-module')
+const path = require('path')
+const modulePath = '../../../app/js/DocumentUpdaterManager'
+const _ = require('underscore')
+
+describe('DocumentUpdaterManager', function () {
+  beforeEach(function () {
+    let Timer
+    this.project_id = 'project-id-923'
+    this.doc_id = 'doc-id-394'
+    this.lines = ['one', 'two', 'three']
+    this.version = 42
+    this.settings = {
+      apis: { documentupdater: { url: 'http://doc-updater.example.com' } },
+      redis: {
+        documentupdater: {
+          key_schema: {
+            pendingUpdates({ doc_id }) {
+              return `PendingUpdates:${doc_id}`
+            },
+          },
+        },
+      },
+      maxUpdateSize: 7 * 1024 * 1024,
+      pendingUpdateListShardCount: 10,
+    }
+    this.rclient = { auth() {} }
+
+    return (this.DocumentUpdaterManager = SandboxedModule.require(modulePath, {
+      requires: {
+        '@overleaf/settings': this.settings,
+        request: (this.request = {}),
+        '@overleaf/redis-wrapper': { createClient: () => this.rclient },
+        '@overleaf/metrics': (this.Metrics = {
+          summary: sinon.stub(),
+          Timer: (Timer = class Timer {
+            done() {}
+          }),
+        }),
+      },
+    }))
+  }) // avoid modifying JSON object directly
+
+  describe('getDocument', function () {
+    beforeEach(function () {
+      return (this.callback = sinon.stub())
+    })
+
+    describe('successfully', function () {
+      beforeEach(function () {
+        this.body = JSON.stringify({
+          lines: this.lines,
+          version: this.version,
+          ops: (this.ops = ['mock-op-1', 'mock-op-2']),
+          ranges: (this.ranges = { mock: 'ranges' }),
+        })
+        this.fromVersion = 2
+        this.request.get = sinon
+          .stub()
+          .callsArgWith(1, null, { statusCode: 200 }, this.body)
+        return this.DocumentUpdaterManager.getDocument(
+          this.project_id,
+          this.doc_id,
+          this.fromVersion,
+          this.callback
+        )
+      })
+
+      it('should get the document from the document updater', function () {
+        const url = `${this.settings.apis.documentupdater.url}/project/${this.project_id}/doc/${this.doc_id}?fromVersion=${this.fromVersion}`
+        return this.request.get.calledWith(url).should.equal(true)
+      })
+
+      return it('should call the callback with the lines, version, ranges and ops', function () {
+        return this.callback
+          .calledWith(null, this.lines, this.version, this.ranges, this.ops)
+          .should.equal(true)
+      })
+    })
+
+    describe('when the document updater API returns an error', function () {
+      beforeEach(function () {
+        this.request.get = sinon
+          .stub()
+          .callsArgWith(
+            1,
+            (this.error = new Error('something went wrong')),
+            null,
+            null
+          )
+        return this.DocumentUpdaterManager.getDocument(
+          this.project_id,
+          this.doc_id,
+          this.fromVersion,
+          this.callback
+        )
+      })
+
+      return it('should return an error to the callback', function () {
+        return this.callback.calledWith(this.error).should.equal(true)
+      })
+    })
+    ;[404, 422].forEach(statusCode =>
+      describe(`when the document updater returns a ${statusCode} status code`, function () {
+        beforeEach(function () {
+          this.request.get = sinon
+            .stub()
+            .callsArgWith(1, null, { statusCode }, '')
+          return this.DocumentUpdaterManager.getDocument(
+            this.project_id,
+            this.doc_id,
+            this.fromVersion,
+            this.callback
+          )
+        })
+
+        return it('should return the callback with an error', function () {
+          this.callback.called.should.equal(true)
+          this.callback
+            .calledWith(
+              sinon.match({
+                message: 'doc updater could not load requested ops',
+                info: { statusCode },
+              })
+            )
+            .should.equal(true)
+          this.logger.error.called.should.equal(false)
+          this.logger.warn.called.should.equal(false)
+        })
+      })
+    )
+
+    return describe('when the document updater returns a failure error code', function () {
+      beforeEach(function () {
+        this.request.get = sinon
+          .stub()
+          .callsArgWith(1, null, { statusCode: 500 }, '')
+        return this.DocumentUpdaterManager.getDocument(
+          this.project_id,
+          this.doc_id,
+          this.fromVersion,
+          this.callback
+        )
+      })
+
+      return it('should return the callback with an error', function () {
+        this.callback.called.should.equal(true)
+        this.callback
+          .calledWith(
+            sinon.match({
+              message: 'doc updater returned a non-success status code',
+              info: {
+                action: 'getDocument',
+                statusCode: 500,
+              },
+            })
+          )
+          .should.equal(true)
+        this.logger.error.called.should.equal(false)
+      })
+    })
+  })
+
+  describe('flushProjectToMongoAndDelete', function () {
+    beforeEach(function () {
+      return (this.callback = sinon.stub())
+    })
+
+    describe('successfully', function () {
+      beforeEach(function () {
+        this.request.del = sinon
+          .stub()
+          .callsArgWith(1, null, { statusCode: 204 }, '')
+        return this.DocumentUpdaterManager.flushProjectToMongoAndDelete(
+          this.project_id,
+          this.callback
+        )
+      })
+
+      it('should delete the project from the document updater', function () {
+        const url = `${this.settings.apis.documentupdater.url}/project/${this.project_id}?background=true`
+        return this.request.del.calledWith(url).should.equal(true)
+      })
+
+      return it('should call the callback with no error', function () {
+        return this.callback.calledWith(null).should.equal(true)
+      })
+    })
+
+    describe('when the document updater API returns an error', function () {
+      beforeEach(function () {
+        this.request.del = sinon
+          .stub()
+          .callsArgWith(
+            1,
+            (this.error = new Error('something went wrong')),
+            null,
+            null
+          )
+        return this.DocumentUpdaterManager.flushProjectToMongoAndDelete(
+          this.project_id,
+          this.callback
+        )
+      })
+
+      return it('should return an error to the callback', function () {
+        return this.callback.calledWith(this.error).should.equal(true)
+      })
+    })
+
+    return describe('when the document updater returns a failure error code', function () {
+      beforeEach(function () {
+        this.request.del = sinon
+          .stub()
+          .callsArgWith(1, null, { statusCode: 500 }, '')
+        return this.DocumentUpdaterManager.flushProjectToMongoAndDelete(
+          this.project_id,
+          this.callback
+        )
+      })
+
+      return it('should return the callback with an error', function () {
+        this.callback.called.should.equal(true)
+        this.callback
+          .calledWith(
+            sinon.match({
+              message: 'doc updater returned a non-success status code',
+              info: {
+                action: 'flushProjectToMongoAndDelete',
+                statusCode: 500,
+              },
+            })
+          )
+          .should.equal(true)
+      })
+    })
+  })
+
+  describe('queueChange', function () {
+    beforeEach(function () {
+      this.change = {
+        doc: '1234567890',
+        op: [{ d: 'test', p: 345 }],
+        v: 789,
+      }
+      this.rclient.rpush = sinon.stub().yields()
+      return (this.callback = sinon.stub())
+    })
+
+    describe('successfully', function () {
+      beforeEach(function () {
+        this.pendingUpdateListKey = `pending-updates-list-key-${Math.random()}`
+
+        this.DocumentUpdaterManager._getPendingUpdateListKey = sinon
+          .stub()
+          .returns(this.pendingUpdateListKey)
+        this.DocumentUpdaterManager.queueChange(
+          this.project_id,
+          this.doc_id,
+          this.change,
+          this.callback
+        )
+      })
+
+      it('should push the change', function () {
+        this.rclient.rpush
+          .calledWith(
+            `PendingUpdates:${this.doc_id}`,
+            JSON.stringify(this.change)
+          )
+          .should.equal(true)
+      })
+
+      it('should notify the doc updater of the change via the pending-updates-list queue', function () {
+        this.rclient.rpush
+          .calledWith(
+            this.pendingUpdateListKey,
+            `${this.project_id}:${this.doc_id}`
+          )
+          .should.equal(true)
+      })
+    })
+
+    describe('with error talking to redis during rpush', function () {
+      beforeEach(function () {
+        this.rclient.rpush = sinon
+          .stub()
+          .yields(new Error('something went wrong'))
+        return this.DocumentUpdaterManager.queueChange(
+          this.project_id,
+          this.doc_id,
+          this.change,
+          this.callback
+        )
+      })
+
+      return it('should return an error', function () {
+        return this.callback
+          .calledWithExactly(sinon.match(Error))
+          .should.equal(true)
+      })
+    })
+
+    describe('with null byte corruption', function () {
+      beforeEach(function () {
+        this.stringifyStub = sinon
+          .stub(JSON, 'stringify')
+          .callsFake(() => '["bad bytes! \u0000 <- here"]')
+        return this.DocumentUpdaterManager.queueChange(
+          this.project_id,
+          this.doc_id,
+          this.change,
+          this.callback
+        )
+      })
+
+      afterEach(function () {
+        this.stringifyStub.restore()
+      })
+
+      it('should return an error', function () {
+        return this.callback
+          .calledWithExactly(sinon.match(Error))
+          .should.equal(true)
+      })
+
+      return it('should not push the change onto the pending-updates-list queue', function () {
+        return this.rclient.rpush.called.should.equal(false)
+      })
+    })
+
+    describe('when the update is too large', function () {
+      beforeEach(function () {
+        this.change = {
+          op: { p: 12, t: 'update is too large'.repeat(1024 * 400) },
+        }
+        return this.DocumentUpdaterManager.queueChange(
+          this.project_id,
+          this.doc_id,
+          this.change,
+          this.callback
+        )
+      })
+
+      it('should return an error', function () {
+        return this.callback
+          .calledWithExactly(sinon.match(Error))
+          .should.equal(true)
+      })
+
+      it('should add the size to the error', function () {
+        return this.callback.args[0][0].info.updateSize.should.equal(7782422)
+      })
+
+      return it('should not push the change onto the pending-updates-list queue', function () {
+        return this.rclient.rpush.called.should.equal(false)
+      })
+    })
+
+    describe('with invalid keys', function () {
+      beforeEach(function () {
+        this.change = {
+          op: [{ d: 'test', p: 345 }],
+          version: 789, // not a valid key
+        }
+        return this.DocumentUpdaterManager.queueChange(
+          this.project_id,
+          this.doc_id,
+          this.change,
+          this.callback
+        )
+      })
+
+      it('should remove the invalid keys from the change', function () {
+        return this.rclient.rpush
+          .calledWith(
+            `PendingUpdates:${this.doc_id}`,
+            JSON.stringify({ op: this.change.op })
+          )
+          .should.equal(true)
+      })
+    })
+  })
+
+  describe('_getPendingUpdateListKey', function () {
+    beforeEach(function () {
+      const keys = _.times(
+        10000,
+        this.DocumentUpdaterManager._getPendingUpdateListKey
+      )
+      this.keys = _.unique(keys)
+    })
+    it('should return normal pending updates key', function () {
+      _.contains(this.keys, 'pending-updates-list').should.equal(true)
+    })
+
+    it('should return pending-updates-list-n keys', function () {
+      _.contains(this.keys, 'pending-updates-list-1').should.equal(true)
+      _.contains(this.keys, 'pending-updates-list-3').should.equal(true)
+      _.contains(this.keys, 'pending-updates-list-9').should.equal(true)
+    })
+
+    it('should not include pending-updates-list-0 key', function () {
+      _.contains(this.keys, 'pending-updates-list-0').should.equal(false)
+    })
+
+    it('should not include maximum as pendingUpdateListShardCount value', function () {
+      _.contains(this.keys, 'pending-updates-list-10').should.equal(false)
+    })
+  })
+})

services/real-time/test/unit/js/DrainManagerTests.js

@@ -0,0 +1,127 @@
+/* eslint-disable
+    no-return-assign,
+    no-unused-vars,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const sinon = require('sinon')
+const SandboxedModule = require('sandboxed-module')
+const path = require('path')
+const modulePath = path.join(__dirname, '../../../app/js/DrainManager')
+
+describe('DrainManager', function () {
+  beforeEach(function () {
+    this.DrainManager = SandboxedModule.require(modulePath, {})
+    return (this.io = {
+      sockets: {
+        clients: sinon.stub(),
+      },
+    })
+  })
+
+  describe('startDrainTimeWindow', function () {
+    beforeEach(function () {
+      this.clients = []
+      for (let i = 0; i <= 5399; i++) {
+        this.clients[i] = {
+          id: i,
+          emit: sinon.stub(),
+        }
+      }
+      this.io.sockets.clients.returns(this.clients)
+      return (this.DrainManager.startDrain = sinon.stub())
+    })
+
+    return it('should set a drain rate fast enough', function (done) {
+      this.DrainManager.startDrainTimeWindow(this.io, 9)
+      this.DrainManager.startDrain.calledWith(this.io, 10).should.equal(true)
+      return done()
+    })
+  })
+
+  return describe('reconnectNClients', function () {
+    beforeEach(function () {
+      this.clients = []
+      for (let i = 0; i <= 9; i++) {
+        this.clients[i] = {
+          id: i,
+          emit: sinon.stub(),
+        }
+      }
+      return this.io.sockets.clients.returns(this.clients)
+    })
+
+    return describe('after first pass', function () {
+      beforeEach(function () {
+        return this.DrainManager.reconnectNClients(this.io, 3)
+      })
+
+      it('should reconnect the first 3 clients', function () {
+        return [0, 1, 2].map(i =>
+          this.clients[i].emit
+            .calledWith('reconnectGracefully')
+            .should.equal(true)
+        )
+      })
+
+      it('should not reconnect any more clients', function () {
+        return [3, 4, 5, 6, 7, 8, 9].map(i =>
+          this.clients[i].emit
+            .calledWith('reconnectGracefully')
+            .should.equal(false)
+        )
+      })
+
+      return describe('after second pass', function () {
+        beforeEach(function () {
+          return this.DrainManager.reconnectNClients(this.io, 3)
+        })
+
+        it('should reconnect the next 3 clients', function () {
+          return [3, 4, 5].map(i =>
+            this.clients[i].emit
+              .calledWith('reconnectGracefully')
+              .should.equal(true)
+          )
+        })
+
+        it('should not reconnect any more clients', function () {
+          return [6, 7, 8, 9].map(i =>
+            this.clients[i].emit
+              .calledWith('reconnectGracefully')
+              .should.equal(false)
+          )
+        })
+
+        it('should not reconnect the first 3 clients again', function () {
+          return [0, 1, 2].map(i =>
+            this.clients[i].emit.calledOnce.should.equal(true)
+          )
+        })
+
+        return describe('after final pass', function () {
+          beforeEach(function () {
+            return this.DrainManager.reconnectNClients(this.io, 100)
+          })
+
+          it('should not reconnect the first 6 clients again', function () {
+            return [0, 1, 2, 3, 4, 5].map(i =>
+              this.clients[i].emit.calledOnce.should.equal(true)
+            )
+          })
+
+          return it('should log out that it reached the end', function () {
+            return this.logger.log
+              .calledWith('All clients have been told to reconnectGracefully')
+              .should.equal(true)
+          })
+        })
+      })
+    })
+  })
+})

services/real-time/test/unit/js/EventLoggerTests.js

@@ -0,0 +1,153 @@
+/* eslint-disable
+    no-return-assign,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const { expect } = require('chai')
+const SandboxedModule = require('sandboxed-module')
+const modulePath = '../../../app/js/EventLogger'
+const sinon = require('sinon')
+const tk = require('timekeeper')
+
+describe('EventLogger', function () {
+  beforeEach(function () {
+    this.start = Date.now()
+    tk.freeze(new Date(this.start))
+    this.EventLogger = SandboxedModule.require(modulePath, {
+      requires: {
+        '@overleaf/metrics': (this.metrics = { inc: sinon.stub() }),
+      },
+    })
+    this.channel = 'applied-ops'
+    this.id_1 = 'random-hostname:abc-1'
+    this.message_1 = 'message-1'
+    this.id_2 = 'random-hostname:abc-2'
+    return (this.message_2 = 'message-2')
+  })
+
+  afterEach(function () {
+    return tk.reset()
+  })
+
+  return describe('checkEventOrder', function () {
+    describe('when the events are in order', function () {
+      beforeEach(function () {
+        this.EventLogger.checkEventOrder(
+          this.channel,
+          this.id_1,
+          this.message_1
+        )
+        return (this.status = this.EventLogger.checkEventOrder(
+          this.channel,
+          this.id_2,
+          this.message_2
+        ))
+      })
+
+      it('should accept events in order', function () {
+        return expect(this.status).to.be.undefined
+      })
+
+      return it('should increment the valid event metric', function () {
+        return this.metrics.inc
+          .calledWith(`event.${this.channel}.valid`)
+          .should.equals(true)
+      })
+    })
+
+    describe('when there is a duplicate events', function () {
+      beforeEach(function () {
+        this.EventLogger.checkEventOrder(
+          this.channel,
+          this.id_1,
+          this.message_1
+        )
+        return (this.status = this.EventLogger.checkEventOrder(
+          this.channel,
+          this.id_1,
+          this.message_1
+        ))
+      })
+
+      it('should return "duplicate" for the same event', function () {
+        return expect(this.status).to.equal('duplicate')
+      })
+
+      return it('should increment the duplicate event metric', function () {
+        return this.metrics.inc
+          .calledWith(`event.${this.channel}.duplicate`)
+          .should.equals(true)
+      })
+    })
+
+    describe('when there are out of order events', function () {
+      beforeEach(function () {
+        this.EventLogger.checkEventOrder(
+          this.channel,
+          this.id_1,
+          this.message_1
+        )
+        this.EventLogger.checkEventOrder(
+          this.channel,
+          this.id_2,
+          this.message_2
+        )
+        return (this.status = this.EventLogger.checkEventOrder(
+          this.channel,
+          this.id_1,
+          this.message_1
+        ))
+      })
+
+      it('should return "out-of-order" for the event', function () {
+        return expect(this.status).to.equal('out-of-order')
+      })
+
+      return it('should increment the out-of-order event metric', function () {
+        return this.metrics.inc
+          .calledWith(`event.${this.channel}.out-of-order`)
+          .should.equals(true)
+      })
+    })
+
+    return describe('after MAX_STALE_TIME_IN_MS', function () {
+      return it('should flush old entries', function () {
+        let status
+        this.EventLogger.MAX_EVENTS_BEFORE_CLEAN = 10
+        this.EventLogger.checkEventOrder(
+          this.channel,
+          this.id_1,
+          this.message_1
+        )
+        for (let i = 1; i <= 8; i++) {
+          status = this.EventLogger.checkEventOrder(
+            this.channel,
+            this.id_1,
+            this.message_1
+          )
+          expect(status).to.equal('duplicate')
+        }
+        // the next event should flush the old entries aboce
+        this.EventLogger.MAX_STALE_TIME_IN_MS = 1000
+        tk.freeze(new Date(this.start + 5 * 1000))
+        // because we flushed the entries this should not be a duplicate
+        this.EventLogger.checkEventOrder(
+          this.channel,
+          'other-1',
+          this.message_2
+        )
+        status = this.EventLogger.checkEventOrder(
+          this.channel,
+          this.id_1,
+          this.message_1
+        )
+        return expect(status).to.be.undefined
+      })
+    })
+  })
+})

services/real-time/test/unit/js/RoomManagerTests.js

@@ -0,0 +1,412 @@
+/* eslint-disable
+    no-return-assign,
+    no-unused-vars,
+    promise/param-names,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const { expect } = require('chai')
+const sinon = require('sinon')
+const modulePath = '../../../app/js/RoomManager.js'
+const SandboxedModule = require('sandboxed-module')
+
+describe('RoomManager', function () {
+  beforeEach(function () {
+    this.project_id = 'project-id-123'
+    this.doc_id = 'doc-id-456'
+    this.other_doc_id = 'doc-id-789'
+    this.client = { namespace: { name: '' }, id: 'first-client' }
+    this.RoomManager = SandboxedModule.require(modulePath, {
+      requires: {
+        '@overleaf/settings': (this.settings = {}),
+        '@overleaf/metrics': (this.metrics = { gauge: sinon.stub() }),
+      },
+    })
+    this.RoomManager._clientsInRoom = sinon.stub()
+    this.RoomManager._clientAlreadyInRoom = sinon.stub()
+    this.RoomEvents = this.RoomManager.eventSource()
+    sinon.spy(this.RoomEvents, 'emit')
+    return sinon.spy(this.RoomEvents, 'once')
+  })
+
+  describe('emitOnCompletion', function () {
+    return describe('when a subscribe errors', function () {
+      afterEach(function () {
+        return process.removeListener('unhandledRejection', this.onUnhandled)
+      })
+
+      beforeEach(function (done) {
+        this.onUnhandled = error => {
+          this.unhandledError = error
+          return done(new Error(`unhandledRejection: ${error.message}`))
+        }
+        process.on('unhandledRejection', this.onUnhandled)
+
+        let reject
+        const subscribePromise = new Promise((_, r) => (reject = r))
+        const promises = [subscribePromise]
+        const eventName = 'project-subscribed-123'
+        this.RoomEvents.once(eventName, () => setTimeout(done, 100))
+        this.RoomManager.emitOnCompletion(promises, eventName)
+        return setTimeout(() => reject(new Error('subscribe failed')))
+      })
+
+      return it('should keep going', function () {
+        return expect(this.unhandledError).to.not.exist
+      })
+    })
+  })
+
+  describe('joinProject', function () {
+    describe('when the project room is empty', function () {
+      beforeEach(function (done) {
+        this.RoomManager._clientsInRoom
+          .withArgs(this.client, this.project_id)
+          .onFirstCall()
+          .returns(0)
+        this.client.join = sinon.stub()
+        this.callback = sinon.stub()
+        this.RoomEvents.on('project-active', id => {
+          return setTimeout(() => {
+            return this.RoomEvents.emit(`project-subscribed-${id}`)
+          }, 100)
+        })
+        return this.RoomManager.joinProject(
+          this.client,
+          this.project_id,
+          err => {
+            this.callback(err)
+            return done()
+          }
+        )
+      })
+
+      it("should emit a 'project-active' event with the id", function () {
+        return this.RoomEvents.emit
+          .calledWithExactly('project-active', this.project_id)
+          .should.equal(true)
+      })
+
+      it("should listen for the 'project-subscribed-id' event", function () {
+        return this.RoomEvents.once
+          .calledWith(`project-subscribed-${this.project_id}`)
+          .should.equal(true)
+      })
+
+      return it('should join the room using the id', function () {
+        return this.client.join
+          .calledWithExactly(this.project_id)
+          .should.equal(true)
+      })
+    })
+
+    return describe('when there are other clients in the project room', function () {
+      beforeEach(function (done) {
+        this.RoomManager._clientsInRoom
+          .withArgs(this.client, this.project_id)
+          .onFirstCall()
+          .returns(123)
+          .onSecondCall()
+          .returns(124)
+        this.client.join = sinon.stub()
+        this.RoomManager.joinProject(this.client, this.project_id, done)
+      })
+
+      it('should join the room using the id', function () {
+        return this.client.join.called.should.equal(true)
+      })
+
+      return it('should not emit any events', function () {
+        return this.RoomEvents.emit.called.should.equal(false)
+      })
+    })
+  })
+
+  describe('joinDoc', function () {
+    describe('when the doc room is empty', function () {
+      beforeEach(function (done) {
+        this.RoomManager._clientsInRoom
+          .withArgs(this.client, this.doc_id)
+          .onFirstCall()
+          .returns(0)
+        this.client.join = sinon.stub()
+        this.callback = sinon.stub()
+        this.RoomEvents.on('doc-active', id => {
+          return setTimeout(() => {
+            return this.RoomEvents.emit(`doc-subscribed-${id}`)
+          }, 100)
+        })
+        return this.RoomManager.joinDoc(this.client, this.doc_id, err => {
+          this.callback(err)
+          return done()
+        })
+      })
+
+      it("should emit a 'doc-active' event with the id", function () {
+        return this.RoomEvents.emit
+          .calledWithExactly('doc-active', this.doc_id)
+          .should.equal(true)
+      })
+
+      it("should listen for the 'doc-subscribed-id' event", function () {
+        return this.RoomEvents.once
+          .calledWith(`doc-subscribed-${this.doc_id}`)
+          .should.equal(true)
+      })
+
+      return it('should join the room using the id', function () {
+        return this.client.join
+          .calledWithExactly(this.doc_id)
+          .should.equal(true)
+      })
+    })
+
+    return describe('when there are other clients in the doc room', function () {
+      beforeEach(function (done) {
+        this.RoomManager._clientsInRoom
+          .withArgs(this.client, this.doc_id)
+          .onFirstCall()
+          .returns(123)
+          .onSecondCall()
+          .returns(124)
+        this.client.join = sinon.stub()
+        this.RoomManager.joinDoc(this.client, this.doc_id, done)
+      })
+
+      it('should join the room using the id', function () {
+        return this.client.join.called.should.equal(true)
+      })
+
+      return it('should not emit any events', function () {
+        return this.RoomEvents.emit.called.should.equal(false)
+      })
+    })
+  })
+
+  describe('leaveDoc', function () {
+    describe('when doc room will be empty after this client has left', function () {
+      beforeEach(function () {
+        this.RoomManager._clientAlreadyInRoom
+          .withArgs(this.client, this.doc_id)
+          .returns(true)
+        this.RoomManager._clientsInRoom
+          .withArgs(this.client, this.doc_id)
+          .onCall(0)
+          .returns(0)
+        this.client.leave = sinon.stub()
+        return this.RoomManager.leaveDoc(this.client, this.doc_id)
+      })
+
+      it('should leave the room using the id', function () {
+        return this.client.leave
+          .calledWithExactly(this.doc_id)
+          .should.equal(true)
+      })
+
+      return it("should emit a 'doc-empty' event with the id", function () {
+        return this.RoomEvents.emit
+          .calledWithExactly('doc-empty', this.doc_id)
+          .should.equal(true)
+      })
+    })
+
+    describe('when there are other clients in the doc room', function () {
+      beforeEach(function () {
+        this.RoomManager._clientAlreadyInRoom
+          .withArgs(this.client, this.doc_id)
+          .returns(true)
+        this.RoomManager._clientsInRoom
+          .withArgs(this.client, this.doc_id)
+          .onCall(0)
+          .returns(123)
+        this.client.leave = sinon.stub()
+        return this.RoomManager.leaveDoc(this.client, this.doc_id)
+      })
+
+      it('should leave the room using the id', function () {
+        return this.client.leave
+          .calledWithExactly(this.doc_id)
+          .should.equal(true)
+      })
+
+      return it('should not emit any events', function () {
+        return this.RoomEvents.emit.called.should.equal(false)
+      })
+    })
+
+    return describe('when the client is not in the doc room', function () {
+      beforeEach(function () {
+        this.RoomManager._clientAlreadyInRoom
+          .withArgs(this.client, this.doc_id)
+          .returns(false)
+        this.RoomManager._clientsInRoom
+          .withArgs(this.client, this.doc_id)
+          .onCall(0)
+          .returns(0)
+        this.client.leave = sinon.stub()
+        return this.RoomManager.leaveDoc(this.client, this.doc_id)
+      })
+
+      it('should not leave the room', function () {
+        return this.client.leave.called.should.equal(false)
+      })
+
+      return it('should not emit any events', function () {
+        return this.RoomEvents.emit.called.should.equal(false)
+      })
+    })
+  })
+
+  return describe('leaveProjectAndDocs', function () {
+    return describe('when the client is connected to the project and multiple docs', function () {
+      beforeEach(function () {
+        this.RoomManager._roomsClientIsIn = sinon
+          .stub()
+          .returns([this.project_id, this.doc_id, this.other_doc_id])
+        this.client.join = sinon.stub()
+        return (this.client.leave = sinon.stub())
+      })
+
+      describe('when this is the only client connected', function () {
+        beforeEach(function (done) {
+          // first call is for the join,
+          // second for the leave
+          this.RoomManager._clientsInRoom
+            .withArgs(this.client, this.doc_id)
+            .onCall(0)
+            .returns(0)
+            .onCall(1)
+            .returns(0)
+          this.RoomManager._clientsInRoom
+            .withArgs(this.client, this.other_doc_id)
+            .onCall(0)
+            .returns(0)
+            .onCall(1)
+            .returns(0)
+          this.RoomManager._clientsInRoom
+            .withArgs(this.client, this.project_id)
+            .onCall(0)
+            .returns(0)
+            .onCall(1)
+            .returns(0)
+          this.RoomManager._clientAlreadyInRoom
+            .withArgs(this.client, this.doc_id)
+            .returns(true)
+            .withArgs(this.client, this.other_doc_id)
+            .returns(true)
+            .withArgs(this.client, this.project_id)
+            .returns(true)
+          this.RoomEvents.on('project-active', id => {
+            return setTimeout(() => {
+              return this.RoomEvents.emit(`project-subscribed-${id}`)
+            }, 100)
+          })
+          this.RoomEvents.on('doc-active', id => {
+            return setTimeout(() => {
+              return this.RoomEvents.emit(`doc-subscribed-${id}`)
+            }, 100)
+          })
+          // put the client in the rooms
+          return this.RoomManager.joinProject(
+            this.client,
+            this.project_id,
+            () => {
+              return this.RoomManager.joinDoc(this.client, this.doc_id, () => {
+                return this.RoomManager.joinDoc(
+                  this.client,
+                  this.other_doc_id,
+                  () => {
+                    // now leave the project
+                    this.RoomManager.leaveProjectAndDocs(this.client)
+                    return done()
+                  }
+                )
+              })
+            }
+          )
+        })
+
+        it('should leave all the docs', function () {
+          this.client.leave.calledWithExactly(this.doc_id).should.equal(true)
+          return this.client.leave
+            .calledWithExactly(this.other_doc_id)
+            .should.equal(true)
+        })
+
+        it('should leave the project', function () {
+          return this.client.leave
+            .calledWithExactly(this.project_id)
+            .should.equal(true)
+        })
+
+        it("should emit a 'doc-empty' event with the id for each doc", function () {
+          this.RoomEvents.emit
+            .calledWithExactly('doc-empty', this.doc_id)
+            .should.equal(true)
+          return this.RoomEvents.emit
+            .calledWithExactly('doc-empty', this.other_doc_id)
+            .should.equal(true)
+        })
+
+        return it("should emit a 'project-empty' event with the id for the project", function () {
+          return this.RoomEvents.emit
+            .calledWithExactly('project-empty', this.project_id)
+            .should.equal(true)
+        })
+      })
+
+      return describe('when other clients are still connected', function () {
+        beforeEach(function () {
+          this.RoomManager._clientsInRoom
+            .withArgs(this.client, this.doc_id)
+            .onFirstCall()
+            .returns(123)
+            .onSecondCall()
+            .returns(122)
+          this.RoomManager._clientsInRoom
+            .withArgs(this.client, this.other_doc_id)
+            .onFirstCall()
+            .returns(123)
+            .onSecondCall()
+            .returns(122)
+          this.RoomManager._clientsInRoom
+            .withArgs(this.client, this.project_id)
+            .onFirstCall()
+            .returns(123)
+            .onSecondCall()
+            .returns(122)
+          this.RoomManager._clientAlreadyInRoom
+            .withArgs(this.client, this.doc_id)
+            .returns(true)
+            .withArgs(this.client, this.other_doc_id)
+            .returns(true)
+            .withArgs(this.client, this.project_id)
+            .returns(true)
+          return this.RoomManager.leaveProjectAndDocs(this.client)
+        })
+
+        it('should leave all the docs', function () {
+          this.client.leave.calledWithExactly(this.doc_id).should.equal(true)
+          return this.client.leave
+            .calledWithExactly(this.other_doc_id)
+            .should.equal(true)
+        })
+
+        it('should leave the project', function () {
+          return this.client.leave
+            .calledWithExactly(this.project_id)
+            .should.equal(true)
+        })
+
+        return it('should not emit any events', function () {
+          return this.RoomEvents.emit.called.should.equal(false)
+        })
+      })
+    })
+  })
+})

services/real-time/test/unit/js/SafeJsonParseTest.js

@@ -0,0 +1,56 @@
+/* eslint-disable
+    camelcase,
+    handle-callback-err,
+    no-return-assign,
+    no-useless-escape,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const { expect } = require('chai')
+const SandboxedModule = require('sandboxed-module')
+const modulePath = '../../../app/js/SafeJsonParse'
+
+describe('SafeJsonParse', function () {
+  beforeEach(function () {
+    return (this.SafeJsonParse = SandboxedModule.require(modulePath, {
+      requires: {
+        '@overleaf/settings': (this.Settings = {
+          maxUpdateSize: 16 * 1024,
+        }),
+      },
+    }))
+  })
+
+  return describe('parse', function () {
+    it('should parse documents correctly', function (done) {
+      return this.SafeJsonParse.parse('{"foo": "bar"}', (error, parsed) => {
+        expect(parsed).to.deep.equal({ foo: 'bar' })
+        return done()
+      })
+    })
+
+    it('should return an error on bad data', function (done) {
+      return this.SafeJsonParse.parse('blah', (error, parsed) => {
+        expect(error).to.exist
+        return done()
+      })
+    })
+
+    return it('should return an error on oversized data', function (done) {
+      // we have a 2k overhead on top of max size
+      const big_blob = Array(16 * 1024).join('A')
+      const data = `{\"foo\": \"${big_blob}\"}`
+      this.Settings.maxUpdateSize = 2 * 1024
+      return this.SafeJsonParse.parse(data, (error, parsed) => {
+        this.logger.error.called.should.equal(false)
+        expect(error).to.exist
+        return done()
+      })
+    })
+  })
+})

services/real-time/test/unit/js/SessionSocketsTests.js

@@ -0,0 +1,197 @@
+/* eslint-disable
+    handle-callback-err,
+    no-return-assign,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const { EventEmitter } = require('events')
+const { expect } = require('chai')
+const SandboxedModule = require('sandboxed-module')
+const modulePath = '../../../app/js/SessionSockets'
+const sinon = require('sinon')
+
+describe('SessionSockets', function () {
+  before(function () {
+    this.SessionSocketsModule = SandboxedModule.require(modulePath)
+    this.io = new EventEmitter()
+    this.id1 = Math.random().toString()
+    this.id2 = Math.random().toString()
+    const redisResponses = {
+      error: [new Error('Redis: something went wrong'), null],
+      unknownId: [null, null],
+    }
+    redisResponses[this.id1] = [null, { user: { _id: '123' } }]
+    redisResponses[this.id2] = [null, { user: { _id: 'abc' } }]
+
+    this.sessionStore = {
+      get: sinon
+        .stub()
+        .callsFake((id, fn) => fn.apply(null, redisResponses[id])),
+    }
+    this.cookieParser = function (req, res, next) {
+      req.signedCookies = req._signedCookies
+      return next()
+    }
+    this.SessionSockets = this.SessionSocketsModule(
+      this.io,
+      this.sessionStore,
+      this.cookieParser,
+      'ol.sid'
+    )
+    return (this.checkSocket = (socket, fn) => {
+      this.SessionSockets.once('connection', fn)
+      return this.io.emit('connection', socket)
+    })
+  })
+
+  describe('without cookies', function () {
+    before(function () {
+      return (this.socket = { handshake: {} })
+    })
+
+    it('should return a lookup error', function (done) {
+      return this.checkSocket(this.socket, error => {
+        expect(error).to.exist
+        expect(error.message).to.equal('could not look up session by key')
+        return done()
+      })
+    })
+
+    return it('should not query redis', function (done) {
+      return this.checkSocket(this.socket, () => {
+        expect(this.sessionStore.get.called).to.equal(false)
+        return done()
+      })
+    })
+  })
+
+  describe('with a different cookie', function () {
+    before(function () {
+      return (this.socket = { handshake: { _signedCookies: { other: 1 } } })
+    })
+
+    it('should return a lookup error', function (done) {
+      return this.checkSocket(this.socket, error => {
+        expect(error).to.exist
+        expect(error.message).to.equal('could not look up session by key')
+        return done()
+      })
+    })
+
+    return it('should not query redis', function (done) {
+      return this.checkSocket(this.socket, () => {
+        expect(this.sessionStore.get.called).to.equal(false)
+        return done()
+      })
+    })
+  })
+
+  describe('with a valid cookie and a failing session lookup', function () {
+    before(function () {
+      return (this.socket = {
+        handshake: { _signedCookies: { 'ol.sid': 'error' } },
+      })
+    })
+
+    it('should query redis', function (done) {
+      return this.checkSocket(this.socket, () => {
+        expect(this.sessionStore.get.called).to.equal(true)
+        return done()
+      })
+    })
+
+    return it('should return a redis error', function (done) {
+      return this.checkSocket(this.socket, error => {
+        expect(error).to.exist
+        expect(error.message).to.equal('Redis: something went wrong')
+        return done()
+      })
+    })
+  })
+
+  describe('with a valid cookie and no matching session', function () {
+    before(function () {
+      return (this.socket = {
+        handshake: { _signedCookies: { 'ol.sid': 'unknownId' } },
+      })
+    })
+
+    it('should query redis', function (done) {
+      return this.checkSocket(this.socket, () => {
+        expect(this.sessionStore.get.called).to.equal(true)
+        return done()
+      })
+    })
+
+    return it('should return a lookup error', function (done) {
+      return this.checkSocket(this.socket, error => {
+        expect(error).to.exist
+        expect(error.message).to.equal('could not look up session by key')
+        return done()
+      })
+    })
+  })
+
+  describe('with a valid cookie and a matching session', function () {
+    before(function () {
+      return (this.socket = {
+        handshake: { _signedCookies: { 'ol.sid': this.id1 } },
+      })
+    })
+
+    it('should query redis', function (done) {
+      return this.checkSocket(this.socket, () => {
+        expect(this.sessionStore.get.called).to.equal(true)
+        return done()
+      })
+    })
+
+    it('should not return an error', function (done) {
+      return this.checkSocket(this.socket, error => {
+        expect(error).to.not.exist
+        return done()
+      })
+    })
+
+    return it('should return the session', function (done) {
+      return this.checkSocket(this.socket, (error, s, session) => {
+        expect(session).to.deep.equal({ user: { _id: '123' } })
+        return done()
+      })
+    })
+  })
+
+  return describe('with a different valid cookie and matching session', function () {
+    before(function () {
+      return (this.socket = {
+        handshake: { _signedCookies: { 'ol.sid': this.id2 } },
+      })
+    })
+
+    it('should query redis', function (done) {
+      return this.checkSocket(this.socket, () => {
+        expect(this.sessionStore.get.called).to.equal(true)
+        return done()
+      })
+    })
+
+    it('should not return an error', function (done) {
+      return this.checkSocket(this.socket, error => {
+        expect(error).to.not.exist
+        return done()
+      })
+    })
+
+    return it('should return the other session', function (done) {
+      return this.checkSocket(this.socket, (error, s, session) => {
+        expect(session).to.deep.equal({ user: { _id: 'abc' } })
+        return done()
+      })
+    })
+  })
+})

services/real-time/test/unit/js/WebApiManagerTests.js

@@ -0,0 +1,208 @@
+/* eslint-disable
+    no-return-assign,
+    no-unused-vars,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const sinon = require('sinon')
+const modulePath = '../../../app/js/WebApiManager.js'
+const SandboxedModule = require('sandboxed-module')
+const { CodedError } = require('../../../app/js/Errors')
+
+describe('WebApiManager', function () {
+  beforeEach(function () {
+    this.project_id = 'project-id-123'
+    this.user_id = 'user-id-123'
+    this.user = { _id: this.user_id }
+    this.callback = sinon.stub()
+    return (this.WebApiManager = SandboxedModule.require(modulePath, {
+      requires: {
+        request: (this.request = {}),
+        '@overleaf/settings': (this.settings = {
+          apis: {
+            web: {
+              url: 'http://web.example.com',
+              user: 'username',
+              pass: 'password',
+            },
+          },
+        }),
+      },
+    }))
+  })
+
+  return describe('joinProject', function () {
+    describe('successfully', function () {
+      beforeEach(function () {
+        this.response = {
+          project: { name: 'Test project' },
+          privilegeLevel: 'owner',
+          isRestrictedUser: true,
+        }
+        this.request.post = sinon
+          .stub()
+          .callsArgWith(1, null, { statusCode: 200 }, this.response)
+        return this.WebApiManager.joinProject(
+          this.project_id,
+          this.user,
+          this.callback
+        )
+      })
+
+      it('should send a request to web to join the project', function () {
+        return this.request.post
+          .calledWith({
+            url: `${this.settings.apis.web.url}/project/${this.project_id}/join`,
+            qs: {
+              user_id: this.user_id,
+            },
+            auth: {
+              user: this.settings.apis.web.user,
+              pass: this.settings.apis.web.pass,
+              sendImmediately: true,
+            },
+            json: true,
+            jar: false,
+            headers: {},
+          })
+          .should.equal(true)
+      })
+
+      return it('should return the project, privilegeLevel, and restricted flag', function () {
+        return this.callback
+          .calledWith(
+            null,
+            this.response.project,
+            this.response.privilegeLevel,
+            this.response.isRestrictedUser
+          )
+          .should.equal(true)
+      })
+    })
+
+    describe('when web replies with a 403', function () {
+      beforeEach(function () {
+        this.request.post = sinon
+          .stub()
+          .callsArgWith(1, null, { statusCode: 403 }, null)
+        this.WebApiManager.joinProject(
+          this.project_id,
+          this.user_id,
+          this.callback
+        )
+      })
+
+      it('should call the callback with an error', function () {
+        this.callback
+          .calledWith(
+            sinon.match({
+              message: 'not authorized',
+            })
+          )
+          .should.equal(true)
+      })
+    })
+
+    describe('when web replies with a 404', function () {
+      beforeEach(function () {
+        this.request.post = sinon
+          .stub()
+          .callsArgWith(1, null, { statusCode: 404 }, null)
+        this.WebApiManager.joinProject(
+          this.project_id,
+          this.user_id,
+          this.callback
+        )
+      })
+
+      it('should call the callback with an error', function () {
+        this.callback
+          .calledWith(
+            sinon.match({
+              message: 'project not found',
+              info: { code: 'ProjectNotFound' },
+            })
+          )
+          .should.equal(true)
+      })
+    })
+
+    describe('with an error from web', function () {
+      beforeEach(function () {
+        this.request.post = sinon
+          .stub()
+          .callsArgWith(1, null, { statusCode: 500 }, null)
+        return this.WebApiManager.joinProject(
+          this.project_id,
+          this.user_id,
+          this.callback
+        )
+      })
+
+      return it('should call the callback with an error', function () {
+        return this.callback
+          .calledWith(
+            sinon.match({
+              message: 'non-success status code from web',
+              info: { statusCode: 500 },
+            })
+          )
+          .should.equal(true)
+      })
+    })
+
+    describe('with no data from web', function () {
+      beforeEach(function () {
+        this.request.post = sinon
+          .stub()
+          .callsArgWith(1, null, { statusCode: 200 }, null)
+        return this.WebApiManager.joinProject(
+          this.project_id,
+          this.user_id,
+          this.callback
+        )
+      })
+
+      return it('should call the callback with an error', function () {
+        return this.callback
+          .calledWith(
+            sinon.match({
+              message: 'no data returned from joinProject request',
+            })
+          )
+          .should.equal(true)
+      })
+    })
+
+    return describe('when the project is over its rate limit', function () {
+      beforeEach(function () {
+        this.request.post = sinon
+          .stub()
+          .callsArgWith(1, null, { statusCode: 429 }, null)
+        return this.WebApiManager.joinProject(
+          this.project_id,
+          this.user_id,
+          this.callback
+        )
+      })
+
+      return it('should call the callback with a TooManyRequests error code', function () {
+        return this.callback
+          .calledWith(
+            sinon.match({
+              message: 'rate-limit hit when joining project',
+              info: {
+                code: 'TooManyRequests',
+              },
+            })
+          )
+          .should.equal(true)
+      })
+    })
+  })
+})

services/real-time/test/unit/js/WebsocketControllerTests.js

@@ -0,0 +1,1662 @@
+/* eslint-disable
+    camelcase,
+    no-return-assign,
+    no-throw-literal,
+    no-unused-vars,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS101: Remove unnecessary use of Array.from
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const sinon = require('sinon')
+const { expect } = require('chai')
+const modulePath = '../../../app/js/WebsocketController.js'
+const SandboxedModule = require('sandboxed-module')
+const tk = require('timekeeper')
+const { UpdateTooLargeError } = require('../../../app/js/Errors')
+
+describe('WebsocketController', function () {
+  beforeEach(function () {
+    tk.freeze(new Date())
+    this.project_id = 'project-id-123'
+    this.user = {
+      _id: (this.user_id = 'user-id-123'),
+      first_name: 'James',
+      last_name: 'Allen',
+      email: 'james@example.com',
+      signUpDate: new Date('2014-01-01'),
+      loginCount: 42,
+    }
+    this.callback = sinon.stub()
+    this.client = {
+      disconnected: false,
+      id: (this.client_id = 'mock-client-id-123'),
+      publicId: `other-id-${Math.random()}`,
+      ol_context: {},
+      joinLeaveEpoch: 0,
+      join: sinon.stub(),
+      leave: sinon.stub(),
+    }
+    return (this.WebsocketController = SandboxedModule.require(modulePath, {
+      requires: {
+        './WebApiManager': (this.WebApiManager = {}),
+        './AuthorizationManager': (this.AuthorizationManager = {}),
+        './DocumentUpdaterManager': (this.DocumentUpdaterManager = {}),
+        './ConnectedUsersManager': (this.ConnectedUsersManager = {}),
+        './WebsocketLoadBalancer': (this.WebsocketLoadBalancer = {}),
+        '@overleaf/metrics': (this.metrics = {
+          inc: sinon.stub(),
+          set: sinon.stub(),
+        }),
+        './RoomManager': (this.RoomManager = {}),
+      },
+    }))
+  })
+
+  afterEach(function () {
+    return tk.reset()
+  })
+
+  describe('joinProject', function () {
+    describe('when authorised', function () {
+      beforeEach(function () {
+        this.client.id = 'mock-client-id'
+        this.project = {
+          name: 'Test Project',
+          owner: {
+            _id: (this.owner_id = 'mock-owner-id-123'),
+          },
+        }
+        this.privilegeLevel = 'owner'
+        this.ConnectedUsersManager.updateUserPosition = sinon
+          .stub()
+          .callsArgAsync(4)
+        this.isRestrictedUser = true
+        this.WebApiManager.joinProject = sinon
+          .stub()
+          .callsArgWith(
+            2,
+            null,
+            this.project,
+            this.privilegeLevel,
+            this.isRestrictedUser
+          )
+        this.RoomManager.joinProject = sinon.stub().callsArg(2)
+        return this.WebsocketController.joinProject(
+          this.client,
+          this.user,
+          this.project_id,
+          this.callback
+        )
+      })
+
+      it('should load the project from web', function () {
+        return this.WebApiManager.joinProject
+          .calledWith(this.project_id, this.user)
+          .should.equal(true)
+      })
+
+      it('should join the project room', function () {
+        return this.RoomManager.joinProject
+          .calledWith(this.client, this.project_id)
+          .should.equal(true)
+      })
+
+      it('should set the privilege level on the client', function () {
+        return this.client.ol_context.privilege_level.should.equal(
+          this.privilegeLevel
+        )
+      })
+      it("should set the user's id on the client", function () {
+        return this.client.ol_context.user_id.should.equal(this.user._id)
+      })
+      it("should set the user's email on the client", function () {
+        return this.client.ol_context.email.should.equal(this.user.email)
+      })
+      it("should set the user's first_name on the client", function () {
+        return this.client.ol_context.first_name.should.equal(
+          this.user.first_name
+        )
+      })
+      it("should set the user's last_name on the client", function () {
+        return this.client.ol_context.last_name.should.equal(
+          this.user.last_name
+        )
+      })
+      it("should set the user's sign up date on the client", function () {
+        return this.client.ol_context.signup_date.should.equal(
+          this.user.signUpDate
+        )
+      })
+      it("should set the user's login_count on the client", function () {
+        return this.client.ol_context.login_count.should.equal(
+          this.user.loginCount
+        )
+      })
+      it('should set the connected time on the client', function () {
+        return this.client.ol_context.connected_time.should.equal(new Date())
+      })
+      it('should set the project_id on the client', function () {
+        return this.client.ol_context.project_id.should.equal(this.project_id)
+      })
+      it('should set the project owner id on the client', function () {
+        return this.client.ol_context.owner_id.should.equal(this.owner_id)
+      })
+      it('should set the is_restricted_user flag on the client', function () {
+        return this.client.ol_context.is_restricted_user.should.equal(
+          this.isRestrictedUser
+        )
+      })
+      it('should call the callback with the project, privilegeLevel and protocolVersion', function () {
+        return this.callback
+          .calledWith(
+            null,
+            this.project,
+            this.privilegeLevel,
+            this.WebsocketController.PROTOCOL_VERSION
+          )
+          .should.equal(true)
+      })
+
+      it('should mark the user as connected in ConnectedUsersManager', function () {
+        return this.ConnectedUsersManager.updateUserPosition
+          .calledWith(this.project_id, this.client.publicId, this.user, null)
+          .should.equal(true)
+      })
+
+      return it('should increment the join-project metric', function () {
+        return this.metrics.inc
+          .calledWith('editor.join-project')
+          .should.equal(true)
+      })
+    })
+
+    describe('when not authorized', function () {
+      beforeEach(function () {
+        this.WebApiManager.joinProject = sinon
+          .stub()
+          .callsArgWith(2, null, null, null)
+        return this.WebsocketController.joinProject(
+          this.client,
+          this.user,
+          this.project_id,
+          this.callback
+        )
+      })
+
+      it('should return an error', function () {
+        return this.callback
+          .calledWith(sinon.match({ message: 'not authorized' }))
+          .should.equal(true)
+      })
+
+      return it('should not log an error', function () {
+        return this.logger.error.called.should.equal(false)
+      })
+    })
+
+    describe('when the subscribe failed', function () {
+      beforeEach(function () {
+        this.client.id = 'mock-client-id'
+        this.project = {
+          name: 'Test Project',
+          owner: {
+            _id: (this.owner_id = 'mock-owner-id-123'),
+          },
+        }
+        this.privilegeLevel = 'owner'
+        this.ConnectedUsersManager.updateUserPosition = sinon
+          .stub()
+          .callsArgAsync(4)
+        this.isRestrictedUser = true
+        this.WebApiManager.joinProject = sinon
+          .stub()
+          .callsArgWith(
+            2,
+            null,
+            this.project,
+            this.privilegeLevel,
+            this.isRestrictedUser
+          )
+        this.RoomManager.joinProject = sinon
+          .stub()
+          .callsArgWith(2, new Error('subscribe failed'))
+        return this.WebsocketController.joinProject(
+          this.client,
+          this.user,
+          this.project_id,
+          this.callback
+        )
+      })
+
+      return it('should return an error', function () {
+        this.callback
+          .calledWith(sinon.match({ message: 'subscribe failed' }))
+          .should.equal(true)
+        return this.callback.args[0][0].message.should.equal('subscribe failed')
+      })
+    })
+
+    describe('when the client has disconnected', function () {
+      beforeEach(function () {
+        this.client.disconnected = true
+        this.WebApiManager.joinProject = sinon.stub().callsArg(2)
+        return this.WebsocketController.joinProject(
+          this.client,
+          this.user,
+          this.project_id,
+          this.callback
+        )
+      })
+
+      it('should not call WebApiManager.joinProject', function () {
+        return expect(this.WebApiManager.joinProject.called).to.equal(false)
+      })
+
+      it('should call the callback with no details', function () {
+        return expect(this.callback.args[0]).to.deep.equal([])
+      })
+
+      return it('should increment the editor.join-project.disconnected metric with a status', function () {
+        return expect(
+          this.metrics.inc.calledWith('editor.join-project.disconnected', 1, {
+            status: 'immediately',
+          })
+        ).to.equal(true)
+      })
+    })
+
+    return describe('when the client disconnects while WebApiManager.joinProject is running', function () {
+      beforeEach(function () {
+        this.WebApiManager.joinProject = (project, user, cb) => {
+          this.client.disconnected = true
+          return cb(
+            null,
+            this.project,
+            this.privilegeLevel,
+            this.isRestrictedUser
+          )
+        }
+
+        return this.WebsocketController.joinProject(
+          this.client,
+          this.user,
+          this.project_id,
+          this.callback
+        )
+      })
+
+      it('should call the callback with no details', function () {
+        return expect(this.callback.args[0]).to.deep.equal([])
+      })
+
+      return it('should increment the editor.join-project.disconnected metric with a status', function () {
+        return expect(
+          this.metrics.inc.calledWith('editor.join-project.disconnected', 1, {
+            status: 'after-web-api-call',
+          })
+        ).to.equal(true)
+      })
+    })
+  })
+
+  describe('leaveProject', function () {
+    beforeEach(function () {
+      this.DocumentUpdaterManager.flushProjectToMongoAndDelete = sinon
+        .stub()
+        .callsArg(1)
+      this.ConnectedUsersManager.markUserAsDisconnected = sinon
+        .stub()
+        .callsArg(2)
+      this.WebsocketLoadBalancer.emitToRoom = sinon.stub()
+      this.RoomManager.leaveProjectAndDocs = sinon.stub()
+      this.clientsInRoom = []
+      this.io = {
+        sockets: {
+          clients: room_id => {
+            if (room_id !== this.project_id) {
+              throw 'expected room_id to be project_id'
+            }
+            return this.clientsInRoom
+          },
+        },
+      }
+      this.client.ol_context.project_id = this.project_id
+      this.client.ol_context.user_id = this.user_id
+      this.WebsocketController.FLUSH_IF_EMPTY_DELAY = 0
+      return tk.reset()
+    }) // Allow setTimeout to work.
+
+    describe('when the client did not joined a project yet', function () {
+      beforeEach(function (done) {
+        this.client.ol_context = {}
+        return this.WebsocketController.leaveProject(this.io, this.client, done)
+      })
+
+      it('should bail out when calling leaveProject', function () {
+        this.WebsocketLoadBalancer.emitToRoom.called.should.equal(false)
+        this.RoomManager.leaveProjectAndDocs.called.should.equal(false)
+        return this.ConnectedUsersManager.markUserAsDisconnected.called.should.equal(
+          false
+        )
+      })
+
+      return it('should not inc any metric', function () {
+        return this.metrics.inc.called.should.equal(false)
+      })
+    })
+
+    describe('when the project is empty', function () {
+      beforeEach(function (done) {
+        this.clientsInRoom = []
+        return this.WebsocketController.leaveProject(this.io, this.client, done)
+      })
+
+      it('should end clientTracking.clientDisconnected to the project room', function () {
+        return this.WebsocketLoadBalancer.emitToRoom
+          .calledWith(
+            this.project_id,
+            'clientTracking.clientDisconnected',
+            this.client.publicId
+          )
+          .should.equal(true)
+      })
+
+      it('should mark the user as disconnected', function () {
+        return this.ConnectedUsersManager.markUserAsDisconnected
+          .calledWith(this.project_id, this.client.publicId)
+          .should.equal(true)
+      })
+
+      it('should flush the project in the document updater', function () {
+        return this.DocumentUpdaterManager.flushProjectToMongoAndDelete
+          .calledWith(this.project_id)
+          .should.equal(true)
+      })
+
+      it('should increment the leave-project metric', function () {
+        return this.metrics.inc
+          .calledWith('editor.leave-project')
+          .should.equal(true)
+      })
+
+      return it('should track the disconnection in RoomManager', function () {
+        return this.RoomManager.leaveProjectAndDocs
+          .calledWith(this.client)
+          .should.equal(true)
+      })
+    })
+
+    describe('when the project is not empty', function () {
+      beforeEach(function (done) {
+        this.clientsInRoom = ['mock-remaining-client']
+        this.io = {
+          sockets: {
+            clients: room_id => {
+              if (room_id !== this.project_id) {
+                throw 'expected room_id to be project_id'
+              }
+              return this.clientsInRoom
+            },
+          },
+        }
+        return this.WebsocketController.leaveProject(this.io, this.client, done)
+      })
+
+      return it('should not flush the project in the document updater', function () {
+        return this.DocumentUpdaterManager.flushProjectToMongoAndDelete.called.should.equal(
+          false
+        )
+      })
+    })
+
+    describe('when client has not authenticated', function () {
+      beforeEach(function (done) {
+        this.client.ol_context.user_id = null
+        this.client.ol_context.project_id = null
+        return this.WebsocketController.leaveProject(this.io, this.client, done)
+      })
+
+      it('should not end clientTracking.clientDisconnected to the project room', function () {
+        return this.WebsocketLoadBalancer.emitToRoom
+          .calledWith(
+            this.project_id,
+            'clientTracking.clientDisconnected',
+            this.client.publicId
+          )
+          .should.equal(false)
+      })
+
+      it('should not mark the user as disconnected', function () {
+        return this.ConnectedUsersManager.markUserAsDisconnected
+          .calledWith(this.project_id, this.client.publicId)
+          .should.equal(false)
+      })
+
+      it('should not flush the project in the document updater', function () {
+        return this.DocumentUpdaterManager.flushProjectToMongoAndDelete
+          .calledWith(this.project_id)
+          .should.equal(false)
+      })
+
+      return it('should not increment the leave-project metric', function () {
+        return this.metrics.inc
+          .calledWith('editor.leave-project')
+          .should.equal(false)
+      })
+    })
+
+    return describe('when client has not joined a project', function () {
+      beforeEach(function (done) {
+        this.client.ol_context.user_id = this.user_id
+        this.client.ol_context.project_id = null
+        return this.WebsocketController.leaveProject(this.io, this.client, done)
+      })
+
+      it('should not end clientTracking.clientDisconnected to the project room', function () {
+        return this.WebsocketLoadBalancer.emitToRoom
+          .calledWith(
+            this.project_id,
+            'clientTracking.clientDisconnected',
+            this.client.publicId
+          )
+          .should.equal(false)
+      })
+
+      it('should not mark the user as disconnected', function () {
+        return this.ConnectedUsersManager.markUserAsDisconnected
+          .calledWith(this.project_id, this.client.publicId)
+          .should.equal(false)
+      })
+
+      it('should not flush the project in the document updater', function () {
+        return this.DocumentUpdaterManager.flushProjectToMongoAndDelete
+          .calledWith(this.project_id)
+          .should.equal(false)
+      })
+
+      return it('should not increment the leave-project metric', function () {
+        return this.metrics.inc
+          .calledWith('editor.leave-project')
+          .should.equal(false)
+      })
+    })
+  })
+
+  describe('joinDoc', function () {
+    beforeEach(function () {
+      this.doc_id = 'doc-id-123'
+      this.doc_lines = ['doc', 'lines']
+      this.version = 42
+      this.ops = ['mock', 'ops']
+      this.ranges = { mock: 'ranges' }
+      this.options = {}
+
+      this.client.ol_context.project_id = this.project_id
+      this.client.ol_context.is_restricted_user = false
+      this.AuthorizationManager.addAccessToDoc = sinon.stub().yields()
+      this.AuthorizationManager.assertClientCanViewProject = sinon
+        .stub()
+        .callsArgWith(1, null)
+      this.AuthorizationManager.assertClientCanViewProjectAndDoc = sinon
+        .stub()
+        .callsArgWith(2, null)
+      this.DocumentUpdaterManager.getDocument = sinon
+        .stub()
+        .callsArgWith(
+          3,
+          null,
+          this.doc_lines,
+          this.version,
+          this.ranges,
+          this.ops
+        )
+      return (this.RoomManager.joinDoc = sinon.stub().callsArg(2))
+    })
+
+    describe('works', function () {
+      beforeEach(function () {
+        return this.WebsocketController.joinDoc(
+          this.client,
+          this.doc_id,
+          -1,
+          this.options,
+          this.callback
+        )
+      })
+
+      it('should inc the joinLeaveEpoch', function () {
+        expect(this.client.joinLeaveEpoch).to.equal(1)
+      })
+
+      it('should check that the client is authorized to view the project', function () {
+        return this.AuthorizationManager.assertClientCanViewProject
+          .calledWith(this.client)
+          .should.equal(true)
+      })
+
+      it('should get the document from the DocumentUpdaterManager with fromVersion', function () {
+        return this.DocumentUpdaterManager.getDocument
+          .calledWith(this.project_id, this.doc_id, -1)
+          .should.equal(true)
+      })
+
+      it('should add permissions for the client to access the doc', function () {
+        return this.AuthorizationManager.addAccessToDoc
+          .calledWith(this.client, this.doc_id)
+          .should.equal(true)
+      })
+
+      it('should join the client to room for the doc_id', function () {
+        return this.RoomManager.joinDoc
+          .calledWith(this.client, this.doc_id)
+          .should.equal(true)
+      })
+
+      it('should call the callback with the lines, version, ranges and ops', function () {
+        return this.callback
+          .calledWith(null, this.doc_lines, this.version, this.ops, this.ranges)
+          .should.equal(true)
+      })
+
+      return it('should increment the join-doc metric', function () {
+        return this.metrics.inc.calledWith('editor.join-doc').should.equal(true)
+      })
+    })
+
+    describe('with a fromVersion', function () {
+      beforeEach(function () {
+        this.fromVersion = 40
+        return this.WebsocketController.joinDoc(
+          this.client,
+          this.doc_id,
+          this.fromVersion,
+          this.options,
+          this.callback
+        )
+      })
+
+      return it('should get the document from the DocumentUpdaterManager with fromVersion', function () {
+        return this.DocumentUpdaterManager.getDocument
+          .calledWith(this.project_id, this.doc_id, this.fromVersion)
+          .should.equal(true)
+      })
+    })
+
+    describe('with doclines that need escaping', function () {
+      beforeEach(function () {
+        this.doc_lines.push(['räksmörgås'])
+        return this.WebsocketController.joinDoc(
+          this.client,
+          this.doc_id,
+          -1,
+          this.options,
+          this.callback
+        )
+      })
+
+      return it('should call the callback with the escaped lines', function () {
+        const escaped_lines = this.callback.args[0][1]
+        const escaped_word = escaped_lines.pop()
+        escaped_word.should.equal('räksmörgås')
+        // Check that unescaping works
+        return decodeURIComponent(escape(escaped_word)).should.equal(
+          'räksmörgås'
+        )
+      })
+    })
+
+    describe('with comments that need encoding', function () {
+      beforeEach(function () {
+        this.ranges.comments = [{ op: { c: 'räksmörgås' } }]
+        return this.WebsocketController.joinDoc(
+          this.client,
+          this.doc_id,
+          -1,
+          { encodeRanges: true },
+          this.callback
+        )
+      })
+
+      return it('should call the callback with the encoded comment', function () {
+        const encoded_comments = this.callback.args[0][4]
+        const encoded_comment = encoded_comments.comments.pop()
+        const encoded_comment_text = encoded_comment.op.c
+        return encoded_comment_text.should.equal('räksmörgås')
+      })
+    })
+
+    describe('with changes that need encoding', function () {
+      it('should call the callback with the encoded insert change', function () {
+        this.ranges.changes = [{ op: { i: 'räksmörgås' } }]
+        this.WebsocketController.joinDoc(
+          this.client,
+          this.doc_id,
+          -1,
+          { encodeRanges: true },
+          this.callback
+        )
+
+        const encoded_changes = this.callback.args[0][4]
+        const encoded_change = encoded_changes.changes.pop()
+        const encoded_change_text = encoded_change.op.i
+        return encoded_change_text.should.equal('räksmörgås')
+      })
+
+      return it('should call the callback with the encoded delete change', function () {
+        this.ranges.changes = [{ op: { d: 'räksmörgås' } }]
+        this.WebsocketController.joinDoc(
+          this.client,
+          this.doc_id,
+          -1,
+          { encodeRanges: true },
+          this.callback
+        )
+
+        const encoded_changes = this.callback.args[0][4]
+        const encoded_change = encoded_changes.changes.pop()
+        const encoded_change_text = encoded_change.op.d
+        return encoded_change_text.should.equal('räksmörgås')
+      })
+    })
+
+    describe('when not authorized', function () {
+      beforeEach(function () {
+        this.AuthorizationManager.assertClientCanViewProject = sinon
+          .stub()
+          .callsArgWith(1, (this.err = new Error('not authorized')))
+        return this.WebsocketController.joinDoc(
+          this.client,
+          this.doc_id,
+          -1,
+          this.options,
+          this.callback
+        )
+      })
+
+      it('should call the callback with an error', function () {
+        return this.callback
+          .calledWith(sinon.match({ message: 'not authorized' }))
+          .should.equal(true)
+      })
+
+      return it('should not call the DocumentUpdaterManager', function () {
+        return this.DocumentUpdaterManager.getDocument.called.should.equal(
+          false
+        )
+      })
+    })
+
+    describe('with a restricted client', function () {
+      beforeEach(function () {
+        this.ranges.comments = [{ op: { a: 1 } }, { op: { a: 2 } }]
+        this.client.ol_context.is_restricted_user = true
+        return this.WebsocketController.joinDoc(
+          this.client,
+          this.doc_id,
+          -1,
+          this.options,
+          this.callback
+        )
+      })
+
+      return it('should overwrite ranges.comments with an empty list', function () {
+        const ranges = this.callback.args[0][4]
+        return expect(ranges.comments).to.deep.equal([])
+      })
+    })
+
+    describe('when the client has disconnected', function () {
+      beforeEach(function () {
+        this.client.disconnected = true
+        return this.WebsocketController.joinDoc(
+          this.client,
+          this.doc_id,
+          -1,
+          this.options,
+          this.callback
+        )
+      })
+
+      it('should call the callback with no details', function () {
+        return expect(this.callback.args[0]).to.deep.equal([])
+      })
+
+      it('should increment the editor.join-doc.disconnected metric with a status', function () {
+        return expect(
+          this.metrics.inc.calledWith('editor.join-doc.disconnected', 1, {
+            status: 'immediately',
+          })
+        ).to.equal(true)
+      })
+
+      return it('should not get the document', function () {
+        return expect(this.DocumentUpdaterManager.getDocument.called).to.equal(
+          false
+        )
+      })
+    })
+
+    describe('when the client disconnects while auth checks are running', function () {
+      beforeEach(function (done) {
+        this.AuthorizationManager.assertClientCanViewProjectAndDoc.yields(
+          new Error()
+        )
+        this.DocumentUpdaterManager.checkDocument = (
+          project_id,
+          doc_id,
+          cb
+        ) => {
+          this.client.disconnected = true
+          cb()
+        }
+
+        this.WebsocketController.joinDoc(
+          this.client,
+          this.doc_id,
+          -1,
+          this.options,
+          (...args) => {
+            this.callback(...args)
+            done()
+          }
+        )
+      })
+
+      it('should call the callback with no details', function () {
+        expect(this.callback.called).to.equal(true)
+        expect(this.callback.args[0]).to.deep.equal([])
+      })
+
+      it('should increment the editor.join-doc.disconnected metric with a status', function () {
+        expect(
+          this.metrics.inc.calledWith('editor.join-doc.disconnected', 1, {
+            status: 'after-client-auth-check',
+          })
+        ).to.equal(true)
+      })
+
+      it('should not get the document', function () {
+        expect(this.DocumentUpdaterManager.getDocument.called).to.equal(false)
+      })
+    })
+
+    describe('when the client starts a parallel joinDoc request', function () {
+      beforeEach(function (done) {
+        this.AuthorizationManager.assertClientCanViewProjectAndDoc.yields(
+          new Error()
+        )
+        this.DocumentUpdaterManager.checkDocument = (
+          project_id,
+          doc_id,
+          cb
+        ) => {
+          this.DocumentUpdaterManager.checkDocument = sinon.stub().yields()
+          this.WebsocketController.joinDoc(
+            this.client,
+            this.doc_id,
+            -1,
+            {},
+            () => {}
+          )
+          cb()
+        }
+
+        this.WebsocketController.joinDoc(
+          this.client,
+          this.doc_id,
+          -1,
+          this.options,
+          (...args) => {
+            this.callback(...args)
+            // make sure the other joinDoc request completed
+            setTimeout(done, 5)
+          }
+        )
+      })
+
+      it('should call the callback with an error', function () {
+        expect(this.callback.called).to.equal(true)
+        expect(this.callback.args[0][0].message).to.equal(
+          'joinLeaveEpoch mismatch'
+        )
+      })
+
+      it('should get the document once (the parallel request wins)', function () {
+        expect(this.DocumentUpdaterManager.getDocument.callCount).to.equal(1)
+      })
+    })
+
+    describe('when the client starts a parallel leaveDoc request', function () {
+      beforeEach(function (done) {
+        this.RoomManager.leaveDoc = sinon.stub()
+
+        this.AuthorizationManager.assertClientCanViewProjectAndDoc.yields(
+          new Error()
+        )
+        this.DocumentUpdaterManager.checkDocument = (
+          project_id,
+          doc_id,
+          cb
+        ) => {
+          this.WebsocketController.leaveDoc(this.client, this.doc_id, () => {})
+          cb()
+        }
+
+        this.WebsocketController.joinDoc(
+          this.client,
+          this.doc_id,
+          -1,
+          this.options,
+          (...args) => {
+            this.callback(...args)
+            done()
+          }
+        )
+      })
+
+      it('should call the callback with an error', function () {
+        expect(this.callback.called).to.equal(true)
+        expect(this.callback.args[0][0].message).to.equal(
+          'joinLeaveEpoch mismatch'
+        )
+      })
+
+      it('should not get the document', function () {
+        expect(this.DocumentUpdaterManager.getDocument.called).to.equal(false)
+      })
+    })
+
+    describe('when the client disconnects while RoomManager.joinDoc is running', function () {
+      beforeEach(function () {
+        this.RoomManager.joinDoc = (client, doc_id, cb) => {
+          this.client.disconnected = true
+          return cb()
+        }
+
+        return this.WebsocketController.joinDoc(
+          this.client,
+          this.doc_id,
+          -1,
+          this.options,
+          this.callback
+        )
+      })
+
+      it('should call the callback with no details', function () {
+        return expect(this.callback.args[0]).to.deep.equal([])
+      })
+
+      it('should increment the editor.join-doc.disconnected metric with a status', function () {
+        return expect(
+          this.metrics.inc.calledWith('editor.join-doc.disconnected', 1, {
+            status: 'after-joining-room',
+          })
+        ).to.equal(true)
+      })
+
+      return it('should not get the document', function () {
+        return expect(this.DocumentUpdaterManager.getDocument.called).to.equal(
+          false
+        )
+      })
+    })
+
+    return describe('when the client disconnects while DocumentUpdaterManager.getDocument is running', function () {
+      beforeEach(function () {
+        this.DocumentUpdaterManager.getDocument = (
+          project_id,
+          doc_id,
+          fromVersion,
+          callback
+        ) => {
+          this.client.disconnected = true
+          return callback(
+            null,
+            this.doc_lines,
+            this.version,
+            this.ranges,
+            this.ops
+          )
+        }
+
+        return this.WebsocketController.joinDoc(
+          this.client,
+          this.doc_id,
+          -1,
+          this.options,
+          this.callback
+        )
+      })
+
+      it('should call the callback with no details', function () {
+        return expect(this.callback.args[0]).to.deep.equal([])
+      })
+
+      return it('should increment the editor.join-doc.disconnected metric with a status', function () {
+        return expect(
+          this.metrics.inc.calledWith('editor.join-doc.disconnected', 1, {
+            status: 'after-doc-updater-call',
+          })
+        ).to.equal(true)
+      })
+    })
+  })
+
+  describe('leaveDoc', function () {
+    beforeEach(function () {
+      this.doc_id = 'doc-id-123'
+      this.client.ol_context.project_id = this.project_id
+      this.RoomManager.leaveDoc = sinon.stub()
+      return this.WebsocketController.leaveDoc(
+        this.client,
+        this.doc_id,
+        this.callback
+      )
+    })
+
+    it('should inc the joinLeaveEpoch', function () {
+      expect(this.client.joinLeaveEpoch).to.equal(1)
+    })
+
+    it('should remove the client from the doc_id room', function () {
+      return this.RoomManager.leaveDoc
+        .calledWith(this.client, this.doc_id)
+        .should.equal(true)
+    })
+
+    it('should call the callback', function () {
+      return this.callback.called.should.equal(true)
+    })
+
+    return it('should increment the leave-doc metric', function () {
+      return this.metrics.inc.calledWith('editor.leave-doc').should.equal(true)
+    })
+  })
+
+  describe('getConnectedUsers', function () {
+    beforeEach(function () {
+      this.client.ol_context.project_id = this.project_id
+      this.users = ['mock', 'users']
+      this.WebsocketLoadBalancer.emitToRoom = sinon.stub()
+      return (this.ConnectedUsersManager.getConnectedUsers = sinon
+        .stub()
+        .callsArgWith(1, null, this.users))
+    })
+
+    describe('when authorized', function () {
+      beforeEach(function (done) {
+        this.AuthorizationManager.assertClientCanViewProject = sinon
+          .stub()
+          .callsArgWith(1, null)
+        return this.WebsocketController.getConnectedUsers(
+          this.client,
+          (...args) => {
+            this.callback(...Array.from(args || []))
+            return done()
+          }
+        )
+      })
+
+      it('should check that the client is authorized to view the project', function () {
+        return this.AuthorizationManager.assertClientCanViewProject
+          .calledWith(this.client)
+          .should.equal(true)
+      })
+
+      it('should broadcast a request to update the client list', function () {
+        return this.WebsocketLoadBalancer.emitToRoom
+          .calledWith(this.project_id, 'clientTracking.refresh')
+          .should.equal(true)
+      })
+
+      it('should get the connected users for the project', function () {
+        return this.ConnectedUsersManager.getConnectedUsers
+          .calledWith(this.project_id)
+          .should.equal(true)
+      })
+
+      it('should return the users', function () {
+        return this.callback.calledWith(null, this.users).should.equal(true)
+      })
+
+      return it('should increment the get-connected-users metric', function () {
+        return this.metrics.inc
+          .calledWith('editor.get-connected-users')
+          .should.equal(true)
+      })
+    })
+
+    describe('when not authorized', function () {
+      beforeEach(function () {
+        this.AuthorizationManager.assertClientCanViewProject = sinon
+          .stub()
+          .callsArgWith(1, (this.err = new Error('not authorized')))
+        return this.WebsocketController.getConnectedUsers(
+          this.client,
+          this.callback
+        )
+      })
+
+      it('should not get the connected users for the project', function () {
+        return this.ConnectedUsersManager.getConnectedUsers.called.should.equal(
+          false
+        )
+      })
+
+      return it('should return an error', function () {
+        return this.callback.calledWith(this.err).should.equal(true)
+      })
+    })
+
+    describe('when restricted user', function () {
+      beforeEach(function () {
+        this.client.ol_context.is_restricted_user = true
+        this.AuthorizationManager.assertClientCanViewProject = sinon
+          .stub()
+          .callsArgWith(1, null)
+        return this.WebsocketController.getConnectedUsers(
+          this.client,
+          this.callback
+        )
+      })
+
+      it('should return an empty array of users', function () {
+        return this.callback.calledWith(null, []).should.equal(true)
+      })
+
+      return it('should not get the connected users for the project', function () {
+        return this.ConnectedUsersManager.getConnectedUsers.called.should.equal(
+          false
+        )
+      })
+    })
+
+    return describe('when the client has disconnected', function () {
+      beforeEach(function () {
+        this.client.disconnected = true
+        this.AuthorizationManager.assertClientCanViewProject = sinon.stub()
+        return this.WebsocketController.getConnectedUsers(
+          this.client,
+          this.callback
+        )
+      })
+
+      it('should call the callback with no details', function () {
+        return expect(this.callback.args[0]).to.deep.equal([])
+      })
+
+      return it('should not check permissions', function () {
+        return expect(
+          this.AuthorizationManager.assertClientCanViewProject.called
+        ).to.equal(false)
+      })
+    })
+  })
+
+  describe('updateClientPosition', function () {
+    beforeEach(function () {
+      this.WebsocketLoadBalancer.emitToRoom = sinon.stub()
+      this.ConnectedUsersManager.updateUserPosition = sinon
+        .stub()
+        .callsArgAsync(4)
+      this.AuthorizationManager.assertClientCanViewProjectAndDoc = sinon
+        .stub()
+        .callsArgWith(2, null)
+      return (this.update = {
+        doc_id: (this.doc_id = 'doc-id-123'),
+        row: (this.row = 42),
+        column: (this.column = 37),
+      })
+    })
+
+    describe('with a logged in user', function () {
+      beforeEach(function (done) {
+        this.client.ol_context = {
+          project_id: this.project_id,
+          first_name: (this.first_name = 'Douglas'),
+          last_name: (this.last_name = 'Adams'),
+          email: (this.email = 'joe@example.com'),
+          user_id: (this.user_id = 'user-id-123'),
+        }
+
+        this.populatedCursorData = {
+          doc_id: this.doc_id,
+          id: this.client.publicId,
+          name: `${this.first_name} ${this.last_name}`,
+          row: this.row,
+          column: this.column,
+          email: this.email,
+          user_id: this.user_id,
+        }
+        this.WebsocketController.updateClientPosition(
+          this.client,
+          this.update,
+          done
+        )
+      })
+
+      it("should send the update to the project room with the user's name", function () {
+        return this.WebsocketLoadBalancer.emitToRoom
+          .calledWith(
+            this.project_id,
+            'clientTracking.clientUpdated',
+            this.populatedCursorData
+          )
+          .should.equal(true)
+      })
+
+      it('should send the  cursor data to the connected user manager', function (done) {
+        this.ConnectedUsersManager.updateUserPosition
+          .calledWith(
+            this.project_id,
+            this.client.publicId,
+            {
+              _id: this.user_id,
+              email: this.email,
+              first_name: this.first_name,
+              last_name: this.last_name,
+            },
+            {
+              row: this.row,
+              column: this.column,
+              doc_id: this.doc_id,
+            }
+          )
+          .should.equal(true)
+        return done()
+      })
+
+      return it('should increment the update-client-position metric at 0.1 frequency', function () {
+        return this.metrics.inc
+          .calledWith('editor.update-client-position', 0.1)
+          .should.equal(true)
+      })
+    })
+
+    describe('with a logged in user who has no last_name set', function () {
+      beforeEach(function (done) {
+        this.client.ol_context = {
+          project_id: this.project_id,
+          first_name: (this.first_name = 'Douglas'),
+          last_name: undefined,
+          email: (this.email = 'joe@example.com'),
+          user_id: (this.user_id = 'user-id-123'),
+        }
+
+        this.populatedCursorData = {
+          doc_id: this.doc_id,
+          id: this.client.publicId,
+          name: `${this.first_name}`,
+          row: this.row,
+          column: this.column,
+          email: this.email,
+          user_id: this.user_id,
+        }
+        this.WebsocketController.updateClientPosition(
+          this.client,
+          this.update,
+          done
+        )
+      })
+
+      it("should send the update to the project room with the user's name", function () {
+        return this.WebsocketLoadBalancer.emitToRoom
+          .calledWith(
+            this.project_id,
+            'clientTracking.clientUpdated',
+            this.populatedCursorData
+          )
+          .should.equal(true)
+      })
+
+      it('should send the  cursor data to the connected user manager', function (done) {
+        this.ConnectedUsersManager.updateUserPosition
+          .calledWith(
+            this.project_id,
+            this.client.publicId,
+            {
+              _id: this.user_id,
+              email: this.email,
+              first_name: this.first_name,
+              last_name: undefined,
+            },
+            {
+              row: this.row,
+              column: this.column,
+              doc_id: this.doc_id,
+            }
+          )
+          .should.equal(true)
+        return done()
+      })
+
+      return it('should increment the update-client-position metric at 0.1 frequency', function () {
+        return this.metrics.inc
+          .calledWith('editor.update-client-position', 0.1)
+          .should.equal(true)
+      })
+    })
+
+    describe('with a logged in user who has no first_name set', function () {
+      beforeEach(function (done) {
+        this.client.ol_context = {
+          project_id: this.project_id,
+          first_name: undefined,
+          last_name: (this.last_name = 'Adams'),
+          email: (this.email = 'joe@example.com'),
+          user_id: (this.user_id = 'user-id-123'),
+        }
+
+        this.populatedCursorData = {
+          doc_id: this.doc_id,
+          id: this.client.publicId,
+          name: `${this.last_name}`,
+          row: this.row,
+          column: this.column,
+          email: this.email,
+          user_id: this.user_id,
+        }
+        this.WebsocketController.updateClientPosition(
+          this.client,
+          this.update,
+          done
+        )
+      })
+
+      it("should send the update to the project room with the user's name", function () {
+        return this.WebsocketLoadBalancer.emitToRoom
+          .calledWith(
+            this.project_id,
+            'clientTracking.clientUpdated',
+            this.populatedCursorData
+          )
+          .should.equal(true)
+      })
+
+      it('should send the  cursor data to the connected user manager', function (done) {
+        this.ConnectedUsersManager.updateUserPosition
+          .calledWith(
+            this.project_id,
+            this.client.publicId,
+            {
+              _id: this.user_id,
+              email: this.email,
+              first_name: undefined,
+              last_name: this.last_name,
+            },
+            {
+              row: this.row,
+              column: this.column,
+              doc_id: this.doc_id,
+            }
+          )
+          .should.equal(true)
+        return done()
+      })
+
+      return it('should increment the update-client-position metric at 0.1 frequency', function () {
+        return this.metrics.inc
+          .calledWith('editor.update-client-position', 0.1)
+          .should.equal(true)
+      })
+    })
+    describe('with a logged in user who has no names set', function () {
+      beforeEach(function (done) {
+        this.client.ol_context = {
+          project_id: this.project_id,
+          first_name: undefined,
+          last_name: undefined,
+          email: (this.email = 'joe@example.com'),
+          user_id: (this.user_id = 'user-id-123'),
+        }
+        return this.WebsocketController.updateClientPosition(
+          this.client,
+          this.update,
+          done
+        )
+      })
+
+      return it('should send the update to the project name with no name', function () {
+        return this.WebsocketLoadBalancer.emitToRoom
+          .calledWith(this.project_id, 'clientTracking.clientUpdated', {
+            doc_id: this.doc_id,
+            id: this.client.publicId,
+            user_id: this.user_id,
+            name: '',
+            row: this.row,
+            column: this.column,
+            email: this.email,
+          })
+          .should.equal(true)
+      })
+    })
+
+    describe('with an anonymous user', function () {
+      beforeEach(function (done) {
+        this.client.ol_context = {
+          project_id: this.project_id,
+        }
+        return this.WebsocketController.updateClientPosition(
+          this.client,
+          this.update,
+          done
+        )
+      })
+
+      it('should send the update to the project room with no name', function () {
+        return this.WebsocketLoadBalancer.emitToRoom
+          .calledWith(this.project_id, 'clientTracking.clientUpdated', {
+            doc_id: this.doc_id,
+            id: this.client.publicId,
+            name: '',
+            row: this.row,
+            column: this.column,
+          })
+          .should.equal(true)
+      })
+
+      return it('should not send cursor data to the connected user manager', function (done) {
+        this.ConnectedUsersManager.updateUserPosition.called.should.equal(false)
+        return done()
+      })
+    })
+
+    return describe('when the client has disconnected', function () {
+      beforeEach(function (done) {
+        this.client.disconnected = true
+        this.AuthorizationManager.assertClientCanViewProjectAndDoc =
+          sinon.stub()
+        return this.WebsocketController.updateClientPosition(
+          this.client,
+          this.update,
+          (...args) => {
+            this.callback(...args)
+            done(args[0])
+          }
+        )
+      })
+
+      it('should call the callback with no details', function () {
+        return expect(this.callback.args[0]).to.deep.equal([])
+      })
+
+      return it('should not check permissions', function () {
+        return expect(
+          this.AuthorizationManager.assertClientCanViewProjectAndDoc.called
+        ).to.equal(false)
+      })
+    })
+  })
+
+  describe('applyOtUpdate', function () {
+    beforeEach(function () {
+      this.update = { op: { p: 12, t: 'foo' } }
+      this.client.ol_context.user_id = this.user_id
+      this.client.ol_context.project_id = this.project_id
+      this.WebsocketController._assertClientCanApplyUpdate = sinon
+        .stub()
+        .yields()
+      return (this.DocumentUpdaterManager.queueChange = sinon
+        .stub()
+        .callsArg(3))
+    })
+
+    describe('succesfully', function () {
+      beforeEach(function () {
+        return this.WebsocketController.applyOtUpdate(
+          this.client,
+          this.doc_id,
+          this.update,
+          this.callback
+        )
+      })
+
+      it('should set the source of the update to the client id', function () {
+        return this.update.meta.source.should.equal(this.client.publicId)
+      })
+
+      it('should set the user_id of the update to the user id', function () {
+        return this.update.meta.user_id.should.equal(this.user_id)
+      })
+
+      it('should queue the update', function () {
+        return this.DocumentUpdaterManager.queueChange
+          .calledWith(this.project_id, this.doc_id, this.update)
+          .should.equal(true)
+      })
+
+      it('should call the callback', function () {
+        return this.callback.called.should.equal(true)
+      })
+
+      return it('should increment the doc updates', function () {
+        return this.metrics.inc
+          .calledWith('editor.doc-update')
+          .should.equal(true)
+      })
+    })
+
+    describe('unsuccessfully', function () {
+      beforeEach(function () {
+        this.client.disconnect = sinon.stub()
+        this.DocumentUpdaterManager.queueChange = sinon
+          .stub()
+          .callsArgWith(3, (this.error = new Error('Something went wrong')))
+        return this.WebsocketController.applyOtUpdate(
+          this.client,
+          this.doc_id,
+          this.update,
+          this.callback
+        )
+      })
+
+      it('should disconnect the client', function () {
+        return this.client.disconnect.called.should.equal(true)
+      })
+
+      it('should not log an error', function () {
+        return this.logger.error.called.should.equal(false)
+      })
+
+      return it('should call the callback with the error', function () {
+        return this.callback.calledWith(this.error).should.equal(true)
+      })
+    })
+
+    describe('when not authorized', function () {
+      beforeEach(function () {
+        this.client.disconnect = sinon.stub()
+        this.WebsocketController._assertClientCanApplyUpdate = sinon
+          .stub()
+          .yields((this.error = new Error('not authorized')))
+        return this.WebsocketController.applyOtUpdate(
+          this.client,
+          this.doc_id,
+          this.update,
+          this.callback
+        )
+      })
+
+      // This happens in a setTimeout to allow the client a chance to receive the error first.
+      // I'm not sure how to unit test, but it is acceptance tested.
+      // it "should disconnect the client", ->
+      // 	@client.disconnect.called.should.equal true
+
+      it('should not log a warning', function () {
+        return this.logger.warn.called.should.equal(false)
+      })
+
+      return it('should call the callback with the error', function () {
+        return this.callback.calledWith(this.error).should.equal(true)
+      })
+    })
+
+    return describe('update_too_large', function () {
+      beforeEach(function (done) {
+        this.client.disconnect = sinon.stub()
+        this.client.emit = sinon.stub()
+        this.client.ol_context.user_id = this.user_id
+        this.client.ol_context.project_id = this.project_id
+        const error = new UpdateTooLargeError(7372835)
+        this.DocumentUpdaterManager.queueChange = sinon
+          .stub()
+          .callsArgWith(3, error)
+        this.WebsocketController.applyOtUpdate(
+          this.client,
+          this.doc_id,
+          this.update,
+          this.callback
+        )
+        return setTimeout(() => done(), 1)
+      })
+
+      it('should call the callback with no error', function () {
+        this.callback.called.should.equal(true)
+        return this.callback.args[0].should.deep.equal([])
+      })
+
+      it('should log a warning with the size and context', function () {
+        this.logger.warn.called.should.equal(true)
+        return this.logger.warn.args[0].should.deep.equal([
+          {
+            user_id: this.user_id,
+            project_id: this.project_id,
+            doc_id: this.doc_id,
+            updateSize: 7372835,
+          },
+          'update is too large',
+        ])
+      })
+
+      describe('after 100ms', function () {
+        beforeEach(function (done) {
+          return setTimeout(done, 100)
+        })
+
+        it('should send an otUpdateError the client', function () {
+          return this.client.emit.calledWith('otUpdateError').should.equal(true)
+        })
+
+        return it('should disconnect the client', function () {
+          return this.client.disconnect.called.should.equal(true)
+        })
+      })
+
+      return describe('when the client disconnects during the next 100ms', function () {
+        beforeEach(function (done) {
+          this.client.disconnected = true
+          return setTimeout(done, 100)
+        })
+
+        it('should not send an otUpdateError the client', function () {
+          return this.client.emit
+            .calledWith('otUpdateError')
+            .should.equal(false)
+        })
+
+        it('should not disconnect the client', function () {
+          return this.client.disconnect.called.should.equal(false)
+        })
+
+        return it('should increment the editor.doc-update.disconnected metric with a status', function () {
+          return expect(
+            this.metrics.inc.calledWith('editor.doc-update.disconnected', 1, {
+              status: 'at-otUpdateError',
+            })
+          ).to.equal(true)
+        })
+      })
+    })
+  })
+
+  return describe('_assertClientCanApplyUpdate', function () {
+    beforeEach(function () {
+      this.edit_update = {
+        op: [
+          { i: 'foo', p: 42 },
+          { c: 'bar', p: 132 },
+        ],
+      } // comments may still be in an edit op
+      this.comment_update = { op: [{ c: 'bar', p: 132 }] }
+      this.AuthorizationManager.assertClientCanEditProjectAndDoc = sinon.stub()
+      return (this.AuthorizationManager.assertClientCanViewProjectAndDoc =
+        sinon.stub())
+    })
+
+    describe('with a read-write client', function () {
+      return it('should return successfully', function (done) {
+        this.AuthorizationManager.assertClientCanEditProjectAndDoc.yields(null)
+        return this.WebsocketController._assertClientCanApplyUpdate(
+          this.client,
+          this.doc_id,
+          this.edit_update,
+          error => {
+            expect(error).to.be.null
+            return done()
+          }
+        )
+      })
+    })
+
+    describe('with a read-only client and an edit op', function () {
+      return it('should return an error', function (done) {
+        this.AuthorizationManager.assertClientCanEditProjectAndDoc.yields(
+          new Error('not authorized')
+        )
+        this.AuthorizationManager.assertClientCanViewProjectAndDoc.yields(null)
+        return this.WebsocketController._assertClientCanApplyUpdate(
+          this.client,
+          this.doc_id,
+          this.edit_update,
+          error => {
+            expect(error.message).to.equal('not authorized')
+            return done()
+          }
+        )
+      })
+    })
+
+    describe('with a read-only client and a comment op', function () {
+      return it('should return successfully', function (done) {
+        this.AuthorizationManager.assertClientCanEditProjectAndDoc.yields(
+          new Error('not authorized')
+        )
+        this.AuthorizationManager.assertClientCanViewProjectAndDoc.yields(null)
+        return this.WebsocketController._assertClientCanApplyUpdate(
+          this.client,
+          this.doc_id,
+          this.comment_update,
+          error => {
+            expect(error).to.be.null
+            return done()
+          }
+        )
+      })
+    })
+
+    return describe('with a totally unauthorized client', function () {
+      return it('should return an error', function (done) {
+        this.AuthorizationManager.assertClientCanEditProjectAndDoc.yields(
+          new Error('not authorized')
+        )
+        this.AuthorizationManager.assertClientCanViewProjectAndDoc.yields(
+          new Error('not authorized')
+        )
+        return this.WebsocketController._assertClientCanApplyUpdate(
+          this.client,
+          this.doc_id,
+          this.comment_update,
+          error => {
+            expect(error.message).to.equal('not authorized')
+            return done()
+          }
+        )
+      })
+    })
+  })
+})

services/real-time/test/unit/js/WebsocketLoadBalancerTests.js

@@ -0,0 +1,304 @@
+/* eslint-disable
+    no-return-assign,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+/*
+ * decaffeinate suggestions:
+ * DS101: Remove unnecessary use of Array.from
+ * DS102: Remove unnecessary code created because of implicit returns
+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
+ */
+const SandboxedModule = require('sandboxed-module')
+const sinon = require('sinon')
+const modulePath = require('path').join(
+  __dirname,
+  '../../../app/js/WebsocketLoadBalancer'
+)
+
+describe('WebsocketLoadBalancer', function () {
+  beforeEach(function () {
+    this.rclient = {}
+    this.RoomEvents = { on: sinon.stub() }
+    this.WebsocketLoadBalancer = SandboxedModule.require(modulePath, {
+      requires: {
+        './RedisClientManager': {
+          createClientList: () => [],
+        },
+        './SafeJsonParse': (this.SafeJsonParse = {
+          parse: (data, cb) => cb(null, JSON.parse(data)),
+        }),
+        './EventLogger': { checkEventOrder: sinon.stub() },
+        './HealthCheckManager': { check: sinon.stub() },
+        './RoomManager': (this.RoomManager = {
+          eventSource: sinon.stub().returns(this.RoomEvents),
+        }),
+        './ChannelManager': (this.ChannelManager = { publish: sinon.stub() }),
+        './ConnectedUsersManager': (this.ConnectedUsersManager = {
+          refreshClient: sinon.stub(),
+        }),
+      },
+    })
+    this.io = {}
+    this.WebsocketLoadBalancer.rclientPubList = [{ publish: sinon.stub() }]
+    this.WebsocketLoadBalancer.rclientSubList = [
+      {
+        subscribe: sinon.stub(),
+        on: sinon.stub(),
+      },
+    ]
+
+    this.room_id = 'room-id'
+    this.message = 'otUpdateApplied'
+    return (this.payload = ['argument one', 42])
+  })
+
+  describe('emitToRoom', function () {
+    beforeEach(function () {
+      return this.WebsocketLoadBalancer.emitToRoom(
+        this.room_id,
+        this.message,
+        ...Array.from(this.payload)
+      )
+    })
+
+    return it('should publish the message to redis', function () {
+      return this.ChannelManager.publish
+        .calledWith(
+          this.WebsocketLoadBalancer.rclientPubList[0],
+          'editor-events',
+          this.room_id,
+          JSON.stringify({
+            room_id: this.room_id,
+            message: this.message,
+            payload: this.payload,
+          })
+        )
+        .should.equal(true)
+    })
+  })
+
+  describe('emitToAll', function () {
+    beforeEach(function () {
+      this.WebsocketLoadBalancer.emitToRoom = sinon.stub()
+      return this.WebsocketLoadBalancer.emitToAll(
+        this.message,
+        ...Array.from(this.payload)
+      )
+    })
+
+    return it("should emit to the room 'all'", function () {
+      return this.WebsocketLoadBalancer.emitToRoom
+        .calledWith('all', this.message, ...Array.from(this.payload))
+        .should.equal(true)
+    })
+  })
+
+  describe('listenForEditorEvents', function () {
+    beforeEach(function () {
+      this.WebsocketLoadBalancer._processEditorEvent = sinon.stub()
+      return this.WebsocketLoadBalancer.listenForEditorEvents()
+    })
+
+    it('should subscribe to the editor-events channel', function () {
+      return this.WebsocketLoadBalancer.rclientSubList[0].subscribe
+        .calledWith('editor-events')
+        .should.equal(true)
+    })
+
+    return it('should process the events with _processEditorEvent', function () {
+      return this.WebsocketLoadBalancer.rclientSubList[0].on
+        .calledWith('message', sinon.match.func)
+        .should.equal(true)
+    })
+  })
+
+  return describe('_processEditorEvent', function () {
+    describe('with bad JSON', function () {
+      beforeEach(function () {
+        this.isRestrictedUser = false
+        this.SafeJsonParse.parse = sinon
+          .stub()
+          .callsArgWith(1, new Error('oops'))
+        return this.WebsocketLoadBalancer._processEditorEvent(
+          this.io,
+          'editor-events',
+          'blah'
+        )
+      })
+
+      return it('should log an error', function () {
+        return this.logger.error.called.should.equal(true)
+      })
+    })
+
+    describe('with a designated room', function () {
+      beforeEach(function () {
+        this.io.sockets = {
+          clients: sinon.stub().returns([
+            {
+              id: 'client-id-1',
+              emit: (this.emit1 = sinon.stub()),
+              ol_context: {},
+            },
+            {
+              id: 'client-id-2',
+              emit: (this.emit2 = sinon.stub()),
+              ol_context: {},
+            },
+            {
+              id: 'client-id-1',
+              emit: (this.emit3 = sinon.stub()),
+              ol_context: {},
+            }, // duplicate client
+          ]),
+        }
+        const data = JSON.stringify({
+          room_id: this.room_id,
+          message: this.message,
+          payload: this.payload,
+        })
+        return this.WebsocketLoadBalancer._processEditorEvent(
+          this.io,
+          'editor-events',
+          data
+        )
+      })
+
+      return it('should send the message to all (unique) clients in the room', function () {
+        this.io.sockets.clients.calledWith(this.room_id).should.equal(true)
+        this.emit1
+          .calledWith(this.message, ...Array.from(this.payload))
+          .should.equal(true)
+        this.emit2
+          .calledWith(this.message, ...Array.from(this.payload))
+          .should.equal(true)
+        return this.emit3.called.should.equal(false)
+      })
+    }) // duplicate client should be ignored
+
+    describe('with a designated room, and restricted clients, not restricted message', function () {
+      beforeEach(function () {
+        this.io.sockets = {
+          clients: sinon.stub().returns([
+            {
+              id: 'client-id-1',
+              emit: (this.emit1 = sinon.stub()),
+              ol_context: {},
+            },
+            {
+              id: 'client-id-2',
+              emit: (this.emit2 = sinon.stub()),
+              ol_context: {},
+            },
+            {
+              id: 'client-id-1',
+              emit: (this.emit3 = sinon.stub()),
+              ol_context: {},
+            }, // duplicate client
+            {
+              id: 'client-id-4',
+              emit: (this.emit4 = sinon.stub()),
+              ol_context: { is_restricted_user: true },
+            },
+          ]),
+        }
+        const data = JSON.stringify({
+          room_id: this.room_id,
+          message: this.message,
+          payload: this.payload,
+        })
+        return this.WebsocketLoadBalancer._processEditorEvent(
+          this.io,
+          'editor-events',
+          data
+        )
+      })
+
+      return it('should send the message to all (unique) clients in the room', function () {
+        this.io.sockets.clients.calledWith(this.room_id).should.equal(true)
+        this.emit1
+          .calledWith(this.message, ...Array.from(this.payload))
+          .should.equal(true)
+        this.emit2
+          .calledWith(this.message, ...Array.from(this.payload))
+          .should.equal(true)
+        this.emit3.called.should.equal(false) // duplicate client should be ignored
+        return this.emit4.called.should.equal(true)
+      })
+    }) // restricted client, but should be called
+
+    describe('with a designated room, and restricted clients, restricted message', function () {
+      beforeEach(function () {
+        this.io.sockets = {
+          clients: sinon.stub().returns([
+            {
+              id: 'client-id-1',
+              emit: (this.emit1 = sinon.stub()),
+              ol_context: {},
+            },
+            {
+              id: 'client-id-2',
+              emit: (this.emit2 = sinon.stub()),
+              ol_context: {},
+            },
+            {
+              id: 'client-id-1',
+              emit: (this.emit3 = sinon.stub()),
+              ol_context: {},
+            }, // duplicate client
+            {
+              id: 'client-id-4',
+              emit: (this.emit4 = sinon.stub()),
+              ol_context: { is_restricted_user: true },
+            },
+          ]),
+        }
+        const data = JSON.stringify({
+          room_id: this.room_id,
+          message: (this.restrictedMessage = 'new-comment'),
+          payload: this.payload,
+        })
+        return this.WebsocketLoadBalancer._processEditorEvent(
+          this.io,
+          'editor-events',
+          data
+        )
+      })
+
+      return it('should send the message to all (unique) clients in the room, who are not restricted', function () {
+        this.io.sockets.clients.calledWith(this.room_id).should.equal(true)
+        this.emit1
+          .calledWith(this.restrictedMessage, ...Array.from(this.payload))
+          .should.equal(true)
+        this.emit2
+          .calledWith(this.restrictedMessage, ...Array.from(this.payload))
+          .should.equal(true)
+        this.emit3.called.should.equal(false) // duplicate client should be ignored
+        return this.emit4.called.should.equal(false)
+      })
+    }) // restricted client, should not be called
+
+    return describe('when emitting to all', function () {
+      beforeEach(function () {
+        this.io.sockets = { emit: (this.emit = sinon.stub()) }
+        const data = JSON.stringify({
+          room_id: 'all',
+          message: this.message,
+          payload: this.payload,
+        })
+        return this.WebsocketLoadBalancer._processEditorEvent(
+          this.io,
+          'editor-events',
+          data
+        )
+      })
+
+      return it('should send the message to all clients', function () {
+        return this.emit
+          .calledWith(this.message, ...Array.from(this.payload))
+          .should.equal(true)
+      })
+    })
+  })
+})

services/real-time/test/unit/js/helpers/MockClient.js

@@ -0,0 +1,23 @@
+/* eslint-disable
+    no-unused-vars,
+*/
+// TODO: This file was created by bulk-decaffeinate.
+// Fix any style issues and re-enable lint.
+let MockClient
+const sinon = require('sinon')
+
+let idCounter = 0
+
+module.exports = MockClient = class MockClient {
+  constructor() {
+    this.ol_context = {}
+    this.join = sinon.stub()
+    this.emit = sinon.stub()
+    this.disconnect = sinon.stub()
+    this.id = idCounter++
+    this.publicId = idCounter++
+    this.joinLeaveEpoch = 0
+  }
+
+  disconnect() {}
+}