wrap project resync in project structure lock

services/web/app/coffee/Features/DocumentUpdater/DocumentUpdaterHandler.coffee

@@ -205,22 +205,7 @@ module.exports = DocumentUpdaterHandler =
 				logger.error {project_id, doc_id, thread_id}, "doc updater returned a non-success status code: #{res.statusCode}"
 				callback new Error("doc updater returned a non-success status code: #{res.statusCode}")
 
-	resyncProject: (project_id, callback) ->
+	resyncProject: (project_id, docs, files, callback) ->
-		ProjectEntityHandler = require "../Project/ProjectEntityHandler"
-		ProjectGetter.getProject project_id, rootFolder: true, (error, project) ->
-			return callback(error) if error?
-			ProjectEntityHandler.getAllEntitiesFromProject project, (error, docs, files) ->
-				return callback(error) if error?
-
-				docs = _.map docs, (doc) ->
-					doc: doc.doc._id
-					path: doc.path
-
-				files = _.map files, (file) ->
-					file: file.file._id
-					path: file.path
-					url: FileStoreHandler._buildUrl(project_id, file.file._id)
-
 		request.post
 			url: "#{settings.apis.documentupdater.url}/project/#{project_id}/resync"
 			json: { docs, files }

services/web/app/coffee/Features/History/HistoryController.coffee

@@ -2,8 +2,8 @@ logger = require "logger-sharelatex"
 request = require "request"
 settings = require "settings-sharelatex"
 AuthenticationController = require "../Authentication/AuthenticationController"
-DocumentUpdaterHandler = require "../DocumentUpdater/DocumentUpdaterHandler"
 ProjectDetailsHandler = require "../Project/ProjectDetailsHandler"
+ProjectEntityUpdateHandler = require "../Project/ProjectEntityUpdateHandler"
 HistoryManager = require "./HistoryManager"
 
 module.exports = HistoryController =
@@ -66,6 +66,6 @@ module.exports = HistoryController =
 
 	resyncProject: (req, res, next = (error) ->) ->
 		project_id = req.params.Project_id
-		DocumentUpdaterHandler.resyncProject project_id, (error) ->
+		ProjectEntityUpdateHandler.resyncProject project_id, (error) ->
 			return next(error) if error?
 			res.sendStatus 204

services/web/app/coffee/Features/Project/ProjectEntityUpdateHandler.coffee

@@ -313,6 +313,25 @@ module.exports = ProjectEntityUpdateHandler = self =
 			TpdsUpdateSender.moveEntity({project_id, startPath, endPath, project_name, rev})
 			DocumentUpdaterHandler.updateProjectStructure project_id, userId, changes, callback
 
+	# This doesn't directly update project structure but we need to take the lock
+	# to prevent anything else being queued before the resync update
+	resyncProject: wrapWithLock (project_id, callback) ->
+		ProjectGetter.getProject project_id, rootFolder: true, (error, project) ->
+			return callback(error) if error?
+			ProjectEntityHandler.getAllEntitiesFromProject project, (error, docs, files) ->
+				return callback(error) if error?
+
+				docs = _.map docs, (doc) ->
+					doc: doc.doc._id
+					path: doc.path
+
+				files = _.map files, (file) ->
+					file: file.file._id
+					path: file.path
+					url: FileStoreHandler._buildUrl(project_id, file.file._id)
+
+				DocumentUpdaterHandler.resyncProject project_id, docs, files, callback
+
 	_cleanUpEntity: (project, entity, entityType, path, userId, callback = (error) ->) ->
 		if(entityType.indexOf("file") != -1)
 			self._cleanUpFile project, entity, path, userId, callback