Cloud Tasks are stuck in queue and are not executed - google-app-engine

Question

I am using Cloud Functions to put tasks into Cloud Tasks Queue and invoke a service (worker) function. Both the task generator and task Handler functions are deployed to Cloud Functions.
This is my createTask.js:
const {CloudTasksClient} = require('#google-cloud/tasks');
const client = new CloudTasksClient();
exports.createTask = async (req, res) => {
const location = 'us-central1';
const project = 'project-id';
const queue = 'queueid';
const payload = 'Hello, World!';
const parent = client.queuePath(project, location, queue);
const task = { appEngineHttpRequest: {
httpMethod: 'POST',
relativeUri : '/log_payload'},
const [ response ] = await tasksClient.createTask({ parent: queuePath, task })
if (payload) {
task.appEngineHttpRequest.body = Buffer.from(payload).toString('base64');
}
let inSeconds = 0 ;
if (inSeconds) {
// The time when the task is scheduled to be attempted.
task.scheduleTime = {
seconds: inSeconds + Date.now() / 1000,
};
}
console.log('Sending task:');
console.log(task);
// Send create task request.
const request = {parent: parent, task: task};
const [response] = await client.createTask(request);
const name = response.name;
console.log(`Created task ${name}`);
res.send({message : "Ok"});
}
server.js
const express = require('express');
const app = express();
app.enable('trust proxy');
app.use(bodyParser.raw({type: 'application/octet-stream'}));
app.get('/', (req, res) => {
// Basic index to verify app is serving
res.send('Hello, World!').end();
});
app.post('/log_payload', (req, res) => {
// Log the request payload
console.log('Received task with payload: %s', req.body);
res.send(`Printed task payload: ${req.body}`).end();
});
app.get('*', (req, res) => {
res.send('OK').end();
});
app.listen(3000 , () => {
console.log(`App listening on port`);
console.log('Press Ctrl+C to quit.');
});
When I run trigger the task generator function via HTTP trigger in Postman, the task is added to the queue but it stays there forever.
The queue looks like this:
The logs of the handler task show it was never triggered. The task in the queue cannot reach its handler.
The logs of task in queue looks like this:
The task is failed and is in the queue:
enter image description here

Answer 1

I have tried to reproduce the issue by following doc. Successfully tasks are executed.I assume you also followed Cloud Task quickstart & Github code samples for set-up. This quickstart attempts to set up following components -
a) Create Task (~ createTask.js) - This can be either run locally or deployed as a Cloud function. In your case, this has been created as a Cloud Function.
b) Task Queue Creation - This is the creation of a Cloud Task queue.
c) Task Target / Handler (~ server.js) - The quickstart assumes this component to be deployed as an App Engine worker instance. This can also be seen in the corresponding Task Creation script (~ createTask.js).
Based on the description, assuming you are deploying the Task Target / Handler also as a cloud function If this assumption is correct then you need to follow this public doc to create a HTTP Target Task which uses "httpRequest" instead of "appEngineHttpRequest" construct. There is also a tutorial, that you may find helpful.
If you are using Cloud Functions instead of App Engine, Target for Tasks is also supported by the error - "404 - Not Found" in those screenshots you provided. This error signifies that the target App Engine instance endpoint (~ log_payload) is not found. This is also the reason why the task is not getting executed.
I suggest you to try out the above steps if those does not help I think you may raise support case here as your issue seems to require more in-depth analysis in your project logs to see why task queues are not being triggered.