Introduction

This package allows Google Cloud Tasks to be used as the queue driver.

Requirements

This package requires Laravel 6 or higher and supports MySQL 8 and PostgreSQL 14. Might support older database versions too, but package hasn't been tested for it.

Please check the Laravel support policy table for supported Laravel and PHP versions.

Installation

Require the package using Composer

composer require stackkit/laravel-google-cloud-tasks-queue

Add a new queue connection to config/queue.php

'cloudtasks' => [
    'driver' => 'cloudtasks',
    'project' => env('STACKKIT_CLOUD_TASKS_PROJECT', ''),
    'location' => env('STACKKIT_CLOUD_TASKS_LOCATION', ''),
    'handler' => env('STACKKIT_CLOUD_TASKS_HANDLER', ''),
    'queue' => env('STACKKIT_CLOUD_TASKS_QUEUE', 'default'),
    'service_account_email' => env('STACKKIT_CLOUD_TASKS_SERVICE_EMAIL', ''),
    // Optional: The deadline in seconds for requests sent to the worker. If the worker
    // does not respond by this deadline then the request is cancelled and the attempt
    // is marked as a DEADLINE_EXCEEDED failure.
    'dispatch_deadline' => null,
    'backoff' => 0,
],

Update the QUEUE_CONNECTION environment variable

QUEUE_CONNECTION=cloudtasks

Now that the package is installed, the final step is to set the correct environment variables.

Please check the table below on what the values mean and what their value should be.

Environment variable	Description	Example
`STACKKIT_CLOUD_TASKS_PROJECT`	The project your queue belongs to.	`my-project`
`STACKKIT_CLOUD_TASKS_LOCATION`	The region where the project is hosted	`europe-west6`
`STACKKIT_CLOUD_TASKS_QUEUE`	The default queue a job will be added to	`emails`
`STACKKIT_CLOUD_TASKS_SERVICE_EMAIL`	The email address of the service account. Important, it should have the correct roles. See the section below which roles.	`my-service-account@appspot.gserviceaccount.com`
`STACKKIT_CLOUD_TASKS_HANDLER` (optional)	The URL that Cloud Tasks will call to process a job. This should be the URL to your Laravel app. By default we will use the URL that dispatched the job.	`https://<your website>.com`

How it works & Differences

Using Cloud Tasks as a Laravel queue driver is fundamentally different than other Laravel queue drivers, like Redis.

Typically a Laravel queue has a worker that listens to incoming jobs using the queue:work / queue:listen command. With Cloud Tasks, this is not the case. Instead, Cloud Tasks will schedule the job for you and make an HTTP request to your application with the job payload. There is no need to run a queue:work/listen command.

Good to know

The "Min backoff" and "Max backoff" options in Cloud Tasks are ignored. This is intentional: Laravel has its own backoff feature (which is more powerful than what Cloud Tasks offers) and therefore I have chosen that over the Cloud Tasks one.
Similarly to the backoff feature, I have also chosen to let the package do job retries the 'Laravel way'. In Cloud Tasks, when a task throws an exception, Cloud Tasks will decide for itself when to retry the task (based on the backoff values). It will also manage its own state and knows how many times a task has been retried. This is different from Laravel. In typical Laravel queues, when a job throws an exception, the job is deleted and released back onto the queue. In order to support Laravel's backoff feature, this package must behave the same way about job retries.

Dashboard (beta)

The package comes with a beautiful dashboard that can be used to monitor all queued jobs.

Experimental

The dashboard works by storing all outgoing tasks in a database table. When Cloud Tasks calls the application and this package handles the task, we will automatically update the tasks' status, attempts and possible errors.

There is probably a (small) performance penalty because each task dispatch and handling does extra database read and writes. Also, the dashboard has not been tested with high throughput queues.

To make use of it, enable it through the .env file:

STACKKIT_CLOUD_TASKS_DASHBOARD_ENABLED=true
STACKKIT_CLOUD_TASKS_DASHBOARD_PASSWORD=MySecretLoginPasswordPleaseChangeThis

Then publish its assets and migrations:

php artisan vendor:publish --tag=cloud-tasks
php artisan migrate

The dashboard is accessible at the URI: /cloud-tasks

Authentication

Set the GOOGLE_APPLICATION_CREDENTIALS environment variable with a path to the credentials file.

More info: https://cloud.google.com/docs/authentication/production

If you're not using your master service account (which has all abilities), you must add the following roles to make it works:

App Engine Viewer
Cloud Tasks Enqueuer
Cloud Tasks Viewer
Cloud Tasks Task Deleter
Service Account User

Security

The job handler requires each request to have an OpenID token. In the installation step we set the service account email, and with that service account, Cloud Tasks will generate an OpenID token and send it along with the job payload to the handler.

This package verifies that the token is digitally signed by Google. Only Google Tasks will be able to call your handler.

More information about OpenID Connect:

https://developers.google.com/identity/protocols/oauth2/openid-connect

Upgrading

Read [UPGRADING.MD](UPGRADING.md) on how to update versions.

Tarpsvo / laravel-google-cloud-tasks-queue

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