handle non-urgent flushes in background

services/document-updater/app/coffee/HistoryManager.coffee

@@ -23,14 +23,16 @@ module.exports = HistoryManager =
 	# flush changes in the background
 	flushProjectChangesAsync: (project_id) ->
 		return if !Settings.apis?.project_history?.enabled
-		HistoryManager.flushProjectChanges project_id, ->
+		HistoryManager.flushProjectChanges project_id, {background:true},  ->
 
 	# flush changes and callback (for when we need to know the queue is flushed)
-	flushProjectChanges: (project_id, callback = (error) ->) ->
+	flushProjectChanges: (project_id, options, callback = (error) ->) ->
 		return callback() if !Settings.apis?.project_history?.enabled
 		url = "#{Settings.apis.project_history.url}/project/#{project_id}/flush"
-		logger.log { project_id, url }, "flushing doc in project history api"
-		request.post url, (error, res, body)->
+		qs = {}
+		qs.background = true if options.background # pass on the background flush option if present
+		logger.log { project_id, url, qs }, "flushing doc in project history api"
+		request.post {url: url, qs: qs}, (error, res, body)->
 			if error?
 				logger.error { error, project_id}, "project history doc to track changes api"
 				return callback(error)

services/document-updater/app/coffee/HttpController.coffee

@@ -131,7 +131,9 @@ module.exports = HttpController =
 		project_id = req.params.project_id
 		logger.log project_id: project_id, "deleting project via http"
 		timer = new Metrics.Timer("http.deleteProject")
-		ProjectManager.flushAndDeleteProjectWithLocks project_id, (error) ->
+		options = {}
+		options.background = true if req.query?.background # allow non-urgent flushes to be queued
+		ProjectManager.flushAndDeleteProjectWithLocks project_id, options, (error) ->
 			timer.done()
 			return next(error) if error?
 			logger.log project_id: project_id, "deleted project via http"

services/document-updater/app/coffee/ProjectFlusher.coffee

@@ -55,7 +55,7 @@ ProjectFlusher =
 				return callback(null, project_ids)
 			jobs = _.map project_ids, (project_id)->
 				return (cb)->
-					ProjectManager.flushAndDeleteProjectWithLocks project_id, cb
+					ProjectManager.flushAndDeleteProjectWithLocks project_id, {background:true}, cb
 			async.parallelLimit jobs, options.concurrency, (error)->
 				return callback(error, project_ids)
 

services/document-updater/app/coffee/ProjectManager.coffee

@@ -39,7 +39,7 @@ module.exports = ProjectManager =
 				else
 					callback(null)
 
-	flushAndDeleteProjectWithLocks: (project_id, _callback = (error) ->) ->
+	flushAndDeleteProjectWithLocks: (project_id, options, _callback = (error) ->) ->
 		timer = new Metrics.Timer("projectManager.flushAndDeleteProjectWithLocks")
 		callback = (args...) ->
 			timer.done()
@@ -64,7 +64,7 @@ module.exports = ProjectManager =
 				# history is completely flushed because the project may be
 				# deleted in web after this call completes, and so further
 				# attempts to flush would fail after that.
-				HistoryManager.flushProjectChanges project_id, (error) ->
+				HistoryManager.flushProjectChanges project_id, options, (error) ->
 					if errors.length > 0
 						callback new Error("Errors deleting docs. See log for details")
 					else if error?

services/document-updater/test/unit/coffee/HistoryManager/HistoryManagerTests.coffee

@@ -43,7 +43,7 @@ describe "HistoryManager", ->
 
 		it "should send a request to the project history api", ->
 			@request.post
-				.calledWith("#{@Settings.apis.project_history.url}/project/#{@project_id}/flush")
+				.calledWith({url: "#{@Settings.apis.project_history.url}/project/#{@project_id}/flush", qs:{background:true}})
 				.should.equal true
 
 	describe "recordAndFlushHistoryOps", ->

services/document-updater/test/unit/coffee/HttpController/HttpControllerTests.coffee

@@ -322,7 +322,7 @@ describe "HttpController", ->
 
 		describe "successfully", ->
 			beforeEach ->
-				@ProjectManager.flushAndDeleteProjectWithLocks = sinon.stub().callsArgWith(1)
+				@ProjectManager.flushAndDeleteProjectWithLocks = sinon.stub().callsArgWith(2)
 				@HttpController.deleteProject(@req, @res, @next)
 
 			it "should delete the project", ->
@@ -345,7 +345,7 @@ describe "HttpController", ->
 
 		describe "when an errors occurs", ->
 			beforeEach ->
-				@ProjectManager.flushAndDeleteProjectWithLocks = sinon.stub().callsArgWith(1, new Error("oops"))
+				@ProjectManager.flushAndDeleteProjectWithLocks = sinon.stub().callsArgWith(2, new Error("oops"))
 				@HttpController.deleteProject(@req, @res, @next)
 
 			it "should call next with the error", ->

services/document-updater/test/unit/coffee/ProjectManager/flushAndDeleteProjectTests.coffee

@@ -12,7 +12,7 @@ describe "ProjectManager - flushAndDeleteProject", ->
 			"./DocumentManager": @DocumentManager = {}
 			"logger-sharelatex": @logger = { log: sinon.stub(), error: sinon.stub() }
 			"./HistoryManager": @HistoryManager =
-				flushProjectChanges: sinon.stub().callsArg(1)
+				flushProjectChanges: sinon.stub().callsArg(2)
 			"./Metrics": @Metrics =
 				Timer: class Timer
 					done: sinon.stub()
@@ -24,7 +24,7 @@ describe "ProjectManager - flushAndDeleteProject", ->
 			@doc_ids = ["doc-id-1", "doc-id-2", "doc-id-3"]
 			@RedisManager.getDocIdsInProject = sinon.stub().callsArgWith(1, null, @doc_ids)
 			@DocumentManager.flushAndDeleteDocWithLock = sinon.stub().callsArg(2)
-			@ProjectManager.flushAndDeleteProjectWithLocks @project_id, (error) =>
+			@ProjectManager.flushAndDeleteProjectWithLocks @project_id, {}, (error) =>
 				@callback(error)
 				done()
 
@@ -41,7 +41,7 @@ describe "ProjectManager - flushAndDeleteProject", ->
 
 		it "should flush project history", ->
 			@HistoryManager.flushProjectChanges
-				.calledWith(@project_id)
+				.calledWith(@project_id, {})
 				.should.equal true
 
 		it "should call the callback without error", ->
@@ -59,7 +59,7 @@ describe "ProjectManager - flushAndDeleteProject", ->
 					callback(@error = new Error("oops, something went wrong"))
 				else
 					callback()
-			@ProjectManager.flushAndDeleteProjectWithLocks @project_id, (error) =>
+			@ProjectManager.flushAndDeleteProjectWithLocks @project_id, {}, (error) =>
 				@callback(error)
 				done()
 
@@ -71,7 +71,7 @@ describe "ProjectManager - flushAndDeleteProject", ->
 
 		it "should still flush project history", ->
 			@HistoryManager.flushProjectChanges
-				.calledWith(@project_id)
+				.calledWith(@project_id, {})
 				.should.equal true
 
 		it "should record the error", ->