What happens when laravel queue fails?

When using Laravel queue, we may encounter task execution failure. At this time, Laravel provides a good solution, which is to use a failure queue.

When we execute queue tasks, we can push failed tasks into a queue specially designed to handle failed tasks, and then regularly check this queue and re-execute the failed tasks in it. In this way, we can avoid the queue tasks from being terminated due to some minor problems and continue to serve us.

Laravel's failure queue provides a variety of configurations and extensible interfaces, which we can configure according to our own needs.

First, we need to set the queue that failed tasks should enter in the configuration file config/queue.php. The key of this configuration item is failed, and its value is an array, which contains two configuration items: driver and queue. The driver configuration item indicates which failure driver we want to use. Laravel provides two failure drivers by default, database and redis. And queue indicates which queue the failed task will enter.

'failed' => [
    'driver' => 'database',
    'queue' => 'failed',
],

If we want to use other failure drivers, we can do so by registering a custom failure driver and referencing it in the driver configuration item.

The code to register a custom driver is as follows:

Queue::failing(function ($connection, $job, $data) {
    // 自定义处理逻辑
});

Next, we need to define the specific logic for handling failed tasks. We can directly push the failed task into the queue again, so that the task will be executed again during the next queue processing. Alternatively, we can also store some information about failed tasks for subsequent inspection and processing.

For the processing method of pushing the failed task into the queue, we can use the following code:

Queue::failing(function ($connection, $job, $data) {
    $queue = $job->getQueue();
    $payload = $job->payload();

    Queue::pushRaw($payload, $queue);
});

This code pushes the failed task back to the original queue, waiting to be executed next time.

As for how to store failed task information, we can use the following code:

Queue::failing(function ($connection, $job, $data) {
    // 将失败任务信息存储到数据库中
    DB::table('failed_jobs')->insert([
        'connection' => $connection,
        'queue' => $job->getQueue(),
        'payload' => $job->getRawBody(),
        'exception' => $data['exception'],
        'failed_at' => now(),
    ]);
});

This code stores failed task information into the database table failed_jobs , so that we can check and process it later.

In addition to the above two processing methods, Laravel also provides more processing methods for us to choose from. We can check out Laravel's documentation and source code for more details.

Finally, we need to periodically check the failure queue and retry the tasks in it. Laravel provides the queue:retry command by default to retry tasks. This command accepts an optional parameter --queue, which represents the task queue we want to retry. If this parameter is not specified, all queues will be retried by default.

php artisan queue:retry 5 --queue=my-queue

This command will re-execute the first 5 failed tasks from the my-queue queue in the failure queue.

In addition, we can also use the operating system's scheduled task tool (such as crontab) to periodically execute the queue:retry command to handle failed tasks regularly.

In short, Laravel's failure queue provides a very useful solution to handle the failure of queue tasks. We can configure it according to our own needs and handle failed tasks in many different ways. At the same time, we also need to regularly check the failure queue and retry the tasks in it to ensure that the queue tasks can run normally.

I hope this article will be helpful to everyone.

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