Overleaf/services/track-changes/app.js

/*
 * decaffeinate suggestions:
 * DS102: Remove unnecessary code created because of implicit returns
 * DS103: Rewrite code to no longer use __guard__
 * DS207: Consider shorter variations of null checks
 * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
 */
const Metrics = require('metrics-sharelatex')
Metrics.initialize('track-changes')
const Settings = require('settings-sharelatex')
const logger = require('logger-sharelatex')
const TrackChangesLogger = logger.initialize('track-changes').logger

if ((Settings.sentry != null ? Settings.sentry.dsn : undefined) != null) {
  logger.initializeErrorReporting(Settings.sentry.dsn)
}

// log updates as truncated strings
const truncateFn = (updates) =>
  JSON.parse(
    JSON.stringify(updates, function (key, value) {
      let len
      if (typeof value === 'string' && (len = value.length) > 80) {
        return (
          value.substr(0, 32) +
          `...(message of length ${len} truncated)...` +
          value.substr(-32)
        )
      } else {
        return value
      }
    })
  )
TrackChangesLogger.addSerializers({
  rawUpdate: truncateFn,
  rawUpdates: truncateFn,
  newUpdates: truncateFn,
  lastUpdate: truncateFn
})

const Path = require('path')

Metrics.memory.monitor(logger)

const childProcess = require('child_process')

const mongodb = require('./app/js/mongodb')
const HttpController = require('./app/js/HttpController')
const express = require('express')
const bodyParser = require('body-parser')

const app = express()

app.use(bodyParser.json())

app.use(Metrics.http.monitor(logger))

Metrics.injectMetricsRoute(app)

app.post('/project/:project_id/doc/:doc_id/flush', HttpController.flushDoc)

app.get('/project/:project_id/doc/:doc_id/diff', HttpController.getDiff)

app.get('/project/:project_id/doc/:doc_id/check', HttpController.checkDoc)

app.get('/project/:project_id/updates', HttpController.getUpdates)

app.post('/project/:project_id/flush', HttpController.flushProject)

app.post(
  '/project/:project_id/doc/:doc_id/version/:version/restore',
  HttpController.restore
)

app.post('/project/:project_id/doc/:doc_id/push', HttpController.pushDocHistory)
app.post('/project/:project_id/doc/:doc_id/pull', HttpController.pullDocHistory)

app.post('/flush/all', HttpController.flushAll)
app.post('/check/dangling', HttpController.checkDanglingUpdates)

let packWorker = null // use a single packing worker

app.post('/pack', function (req, res, next) {
  if (packWorker != null) {
    return res.send('pack already running')
  } else {
    logger.log('running pack')
    packWorker = childProcess.fork(
      Path.join(__dirname, '/app/js/PackWorker.js'),
      [
        req.query.limit || 1000,
        req.query.delay || 1000,
        req.query.timeout || 30 * 60 * 1000
      ]
    )
    packWorker.on('exit', function (code, signal) {
      logger.log({ code, signal }, 'history auto pack exited')
      return (packWorker = null)
    })
    return res.send('pack started')
  }
})

app.get('/status', (req, res, next) => res.send('track-changes is alive'))

app.get('/oops', function (req, res, next) {
  throw new Error('dummy test error')
})

app.get('/check_lock', HttpController.checkLock)

app.get('/health_check', HttpController.healthCheck)

app.use(function (error, req, res, next) {
  logger.error({ err: error, req }, 'an internal error occured')
  return res.sendStatus(500)
})

const port =
  __guard__(
    Settings.internal != null ? Settings.internal.trackchanges : undefined,
    (x) => x.port
  ) || 3015
const host =
  __guard__(
    Settings.internal != null ? Settings.internal.trackchanges : undefined,
    (x1) => x1.host
  ) || 'localhost'

if (!module.parent) {
  // Called directly
  mongodb
    .waitForDb()
    .then(() => {
      app.listen(port, host, function (error) {
        if (error != null) {
          return logger.error(
            { err: error },
            'could not start track-changes server'
          )
        } else {
          return logger.info(
            `trackchanges starting up, listening on ${host}:${port}`
          )
        }
      })
    })
    .catch((err) => {
      logger.fatal({ err }, 'Cannot connect to mongo. Exiting.')
      process.exit(1)
    })
}

module.exports = app

function __guard__(value, transform) {
  return typeof value !== 'undefined' && value !== null
    ? transform(value)
    : undefined
}