Flush project to track changes when leaving

services/web/app/coffee/Features/Editor/EditorController.coffee

@@ -13,6 +13,7 @@ AuthorizationManager = require("../Security/AuthorizationManager")
 AutomaticSnapshotManager = require("../Versioning/AutomaticSnapshotManager")
 VersioningApiHandler = require("../Versioning/VersioningApiHandler")
 EditorRealTimeController = require("./EditorRealTimeController")
+TrackChangesManager = require("../TrackChanges/TrackChangesManager")
 settings = require('settings-sharelatex')
 slReqIdHelper = require('soa-req-id')
 tpdsPollingBackgroundTasks = require('../ThirdPartyDataStore/TpdsPollingBackgroundTasks')
@@ -104,6 +105,7 @@ module.exports = EditorController =
 			logger.log project_id: project_id, connectedCount: peopleStillInProject, "flushing if empty"
 			if peopleStillInProject == 0
 				DocumentUpdaterHandler.flushProjectToMongoAndDelete(project_id)
+				TrackChangesManager.flushProject(project_id)
 			callback()
 			), 500
 		

services/web/app/coffee/Features/TrackChanges/TrackChangesManager.coffee

@@ -0,0 +1,16 @@
+settings = require "settings-sharelatex"
+request = require "request"
+logger = require "logger-sharelatex"
+
+module.exports = TrackChangesManager =
+	flushProject: (project_id, callback = (error) ->) ->
+		logger.log project_id: project_id, "flushing project in track-changes api"
+		url = "#{settings.apis.trackchanges.url}/project/#{project_id}/flush"
+		request.post url, (error, res, body) ->
+			return callback(error) if error?
+			if 200 <= res.statusCode < 300
+				callback(null)
+			else
+				error = new Error("track-changes api responded with non-success code: #{res.statusCode}")
+				logger.error err: error, project_id: project_id, "error flushing project in track-changes api"
+				callback(error)