Check if Job is already in queue using Laravel 5 and Redis

Question

I've implemented a jobs queue a few days ago and I've been experiencing problems with duplication, I'm currently working with Redis and followed the Laravel's official tutorial.

In my case, whenever someone goes to the homepage, a job is sent to the queue, lets take this example:

HomeController's index() :

public function index()
{
    if(/*condition*/){
          //UpdateServer being the job
          $this->dispatch(new UpdateServer());
    }
}

Since this task takes about 10 seconds to complete, if there's n requests to my homepage while the task is being processed, there will be n more of the same job in queue, resulting in unexpected results in my Database.

So my question is, is there any way to know if a certain job is already in queue?

Answer 1

I know it's very old question, but I'm answering it for future Google users.

Since Laravel 8 there is the "Unique Jobs" feature - https://laravel.com/docs/8.x/queues#unique-jobs.

Answer 2

For anyone wondering why

Queue::size('queueName');

is not the same size as

Redis::llen('queues:queueName');

is because Laravel uses 3 records to count the size of a queue, so if you want the true number of jobs in the queue you must do:

Redis::lrange('queues:queueName', 0, -1);
Redis::zrange('queues:queueName:delayed', 0, -1);
Redis::zrange('queues:queueName:reserved', 0, -1);

Now you can evaluate if your desired input is in one of those queues and act according.