Send output files on timeout

The unconventional use of callbacks to return both an error and data
after compilation created a subtle bug where the output files were
dropped by the LockManager in case of an error such as a timeout.

This prevented the frontend to show error logs when a timeout occurs,
creating confusion among users.

We now attach the output files to the error so that they reach the
controller and are sent back to the web service.

app/coffee/CompileController.coffee

@@ -26,21 +26,19 @@ module.exports = CompileController =
 						status = "terminated"
 					else if error?.validate
 						status = "validation-#{error.validate}"
+					else if error?.timedout
+						status = "timedout"
+						logger.log err: error, project_id: request.project_id, "timeout running compile"
 					else if error?
-						if error.timedout
+						status = "error"
-							status = "timedout"
+						code = 500
-							logger.log err: error, project_id: request.project_id, "timeout running compile"
+						logger.warn err: error, project_id: request.project_id, "error running compile"
-						else
-							status = "error"
-							code = 500
-							logger.warn err: error, project_id: request.project_id, "error running compile"
-
 					else
 						status = "failure"
 						for file in outputFiles
 							if file.path?.match(/output\.pdf$/)
 								status = "success"
-								
+
 						if status == "failure"
 							logger.warn project_id: request.project_id, outputFiles:outputFiles, "project failed to compile successfully, no output.pdf generated"
 
@@ -49,6 +47,9 @@ module.exports = CompileController =
 							if file.path is "core"
 								logger.error project_id:request.project_id, req:req, outputFiles:outputFiles, "core file found in output"
 
+					if error?
+						outputFiles = error.outputFiles || []
+
 					timer.done()
 					res.status(code or 200).send {
 						compile:

app/coffee/CompileManager.coffee

@@ -106,10 +106,11 @@ module.exports = CompileManager =
 						error = new Error("compilation")
 						error.validate = "fail"
 					# compile was killed by user, was a validation, or a compile which failed validation
-					if error?.terminated or error?.validate
+					if error?.terminated or error?.validate or error?.timedout
 						OutputFileFinder.findOutputFiles resourceList, compileDir, (err, outputFiles) ->
 							return callback(err) if err?
-							callback(error, outputFiles) # return output files so user can check logs
+							error.outputFiles = outputFiles  # return output files so user can check logs
+							callback(error)
 						return
 					# compile completed normally
 					return callback(error) if error?

app/coffee/DockerRunner.coffee

@@ -78,7 +78,7 @@ module.exports = DockerRunner =
 			_callback(args...)
 			# Only call the callback once
 			_callback = () ->
-		
+
 		name = options.name
 
 		streamEnded = false
@@ -115,7 +115,7 @@ module.exports = DockerRunner =
 
 	_getContainerOptions: (command, image, volumes, timeout, environment) ->
 		timeoutInSeconds = timeout / 1000
-		
+
 		dockerVolumes = {}
 		for hostVol, dockerVol of volumes
 			dockerVolumes[dockerVol] = {}
@@ -148,7 +148,7 @@ module.exports = DockerRunner =
 				"Ulimits": [{'Name': 'cpu', 'Soft': timeoutInSeconds+5, 'Hard': timeoutInSeconds+10}]
 				"CapDrop": "ALL"
 				"SecurityOpt": ["no-new-privileges"]
-		
+
 
 		if Settings.path?.synctexBinHostPath?
 			options["HostConfig"]["Binds"].push("#{Settings.path.synctexBinHostPath}:/opt/synctex:ro")
@@ -276,7 +276,7 @@ module.exports = DockerRunner =
 			logger.log container_id: containerId, "timeout reached, killing container"
 			container.kill(() ->)
 		, timeout
-			
+
 		logger.log container_id: containerId, "waiting for docker container"
 		container.wait (error, res) ->
 			if error?
@@ -355,4 +355,4 @@ module.exports = DockerRunner =
 			, oneHour = 60 * 60 * 1000
 		, randomDelay
 
-DockerRunner.startContainerMonitor()
+DockerRunner.startContainerMonitor()

test/acceptance/coffee/TimeoutTests.coffee

@@ -15,7 +15,7 @@ describe "Timed out compile", ->
 					\\documentclass{article}
 					\\begin{document}
 					\\def\\x{Hello!\\par\\x}
-					\\x					
+					\\x
 					\\end{document}
 				'''
 			]
@@ -29,3 +29,6 @@ describe "Timed out compile", ->
 	it "should return a timedout status", ->
 		@body.compile.status.should.equal "timedout"
 
+	it "should return the log output file name", ->
+		outputFilePaths = @body.compile.outputFiles.map((x) => x.path)
+		outputFilePaths.should.include('output.log')