Automatically clear CLSI cache when compile fails

services/web/app/coffee/Features/Compile/ClsiManager.coffee

@@ -26,6 +26,9 @@ module.exports = ClsiManager =
 			return callback(error) if error?
 			callback null, body?.split("\n") or []
 
+	deleteAuxFiles: (project_id, callback = (error) ->) ->
+		request.del "#{Settings.apis.clsi.url}/project/#{project_id}", callback
+
 	_postToClsi: (project_id, req, callback = (error, response) ->) ->
 		request.post {
 			url:  "#{Settings.apis.clsi.url}/project/#{project_id}/compile"

services/web/app/coffee/Features/Compile/CompileController.coffee

@@ -1,6 +1,7 @@
 Metrics = require "../../infrastructure/Metrics"
 Project = require("../../models/Project").Project
 CompileManager = require("./CompileManager")
+ClsiManager = require("./ClsiManager")
 logger  = require "logger-sharelatex"
 request = require "request"
 Settings = require "settings-sharelatex"
@@ -35,7 +36,9 @@ module.exports = CompileController =
 
 	deleteAuxFiles: (req, res, next) ->
 		project_id = req.params.Project_id
-		CompileController.proxyToClsi("/project/#{project_id}", req, res, next)
+		ClsiManager.deleteAuxFiles project_id, (error) ->
+			return next(error) if error?
+			res.send(200)
 
 	compileAndDownloadPdf: (req, res, next)->
 		project_id = req.params.project_id

services/web/app/coffee/Features/Compile/CompileManager.coffee

@@ -33,8 +33,16 @@ module.exports = CompileManager =
 						ClsiManager.sendRequest project_id, (error, status, outputFiles) ->
 							return callback(error) if error?
 							logger.log files: outputFiles, "output files"
+							
+							if status == "failure"
+								# Sometimes compiles fail because the project gets in a broken
+								# state in LaTeX. So always clear cache on a failure.
+								# Can do this in the background.
+								ClsiManager.deleteAuxFiles project_id
+
 							callback(null, status, outputFiles)
 
+
 	getLogLines: (project_id, callback)->
 		Metrics.inc "editor.raw-logs"
 		ClsiManager.getLogLines project_id, (error, logLines)->

services/web/test/UnitTests/coffee/Compile/ClsiManagerTests.coffee

@@ -72,6 +72,19 @@ describe "ClsiManager", ->
 			it "should call the callback with a failure statue", ->
 				@callback.calledWith(null, @status).should.equal true
 
+	describe "deleteAuxFiles", ->
+		beforeEach ->
+			@request.del = sinon.stub().callsArg(1)
+			@ClsiManager.deleteAuxFiles @project_id, @callback
+
+		it "should call the delete method in the CLSI", ->
+			@request.del
+				.calledWith("#{@settings.apis.clsi.url}/project/#{@project_id}")
+				.should.equal true
+
+		it "should call the callback", ->
+			@callback.called.should.equal true
+
 	describe "_buildRequest", ->
 		beforeEach ->
 			@project =

services/web/test/UnitTests/coffee/Compile/CompileControllerTests.coffee

@@ -21,6 +21,7 @@ describe "CompileController", ->
 			"logger-sharelatex": @logger = { log: sinon.stub(), error: sinon.stub() }
 			"../../infrastructure/Metrics": @Metrics =  { inc: sinon.stub() }
 			"./CompileManager":@CompileManager
+			"./ClsiManager": @ClsiManager
 			"../Authentication/AuthenticationController": @AuthenticationController = {}
 		@project_id = "project-id"
 		@next = sinon.stub()
@@ -144,14 +145,20 @@ describe "CompileController", ->
 
 	describe "deleteAuxFiles", ->
 		beforeEach ->
-			@CompileController.proxyToClsi = sinon.stub()
+			@ClsiManager.deleteAuxFiles = sinon.stub().callsArg(1)
 			@req.params =
 				Project_id: @project_id
+			@res.send = sinon.stub()
 			@CompileController.deleteAuxFiles @req, @res, @next
 
 		it "should proxy to the CLSI", ->
-			@CompileController.proxyToClsi
-				.calledWith("/project/#{@project_id}", @req, @res, @next)
+			@ClsiManager.deleteAuxFiles
+				.calledWith(@project_id)
+				.should.equal true
+
+		it "should return a 200", ->
+			@res.send
+				.calledWith(200)
 				.should.equal true
 
 	describe "compileAndDownloadPdf", ->

services/web/test/UnitTests/coffee/Compile/CompileManagerTests.coffee

@@ -75,6 +75,23 @@ describe "CompileManager", ->
 				@logger.log
 					.calledWith(project_id: @project_id, user_id: @user_id, "compiling project")
 					.should.equal true
+
+		describe "when the compile fails", ->
+			beforeEach ->
+				@CompileManager._checkIfAutoCompileLimitHasBeenHit = (_, cb)-> cb(null, true)
+				@ClsiManager.deleteAuxFiles = sinon.stub()
+				@ClsiManager.sendRequest = sinon.stub().callsArgWith(1, null, @status = "failure")
+				@CompileManager.compile @project_id, @user_id, {}, @callback
+
+			it "should call the callback", ->
+				@callback
+					.calledWith(null, @status)
+					.should.equal true
+
+			it "should clear the CLSI cache", ->
+				@ClsiManager.deleteAuxFiles
+					.calledWith(@project_id)
+					.should.equal true
 				
 		describe "when the project has been recently compiled", ->
 			beforeEach ->