Laravel console mutex

Prevents overlapping for Laravel console commands.

Dependencies

• PHP >=5.5.9
• Laravel >=5.2

Usage

1. Install package through composer:

   composer require illuminated/console-mutex

2. Use Illuminated\Console\WithoutOverlapping trait in your console command class:

   namespace App\Console\Commands;
   
   use Illuminate\Console\Command;
   use Illuminated\Console\WithoutOverlapping;
   
   class Foo extends Command
   {
       use WithoutOverlapping;
   
       // ...
   }

3. Now your command is protected against overlapping:

   ➜ php artisan foo:bar baz
   Command is running now!

Strategies

Overlapping can be prevented by various strategies:

• file (default)
• mysql
• redis
• memcached

Default file strategy is fine for a small applications, which are deployed on a single server. If your application is more complex and, for example, is deployed on a several nodes, then you probably would like to use some other mutex strategy.

You can change mutex strategy by specifying $mutexStrategy field:

class Foo extends Command
{
    use WithoutOverlapping;

    protected $mutexStrategy = 'mysql';

    // ...
}

Or by using setMutexStrategy method:

class Foo extends Command
{
    use WithoutOverlapping;

    public function __construct()
    {
        parent::__construct();
    
        $this->setMutexStrategy('mysql');
    }

    // ...
}

Advanced

Sometimes it is useful to set common mutex for a several commands. You can easily achieve this by setting them the same mutex name. By default, mutex name is generated based on a command's name and arguments. To change this, just override getMutexName method in your command:

class Foo extends Command
{
    use WithoutOverlapping;

    public function getMutexName()
    {
        return "icmutex-custom-name";
    }

    // ...
}

Troubleshooting

Trait included, but nothing happens?

Note, that WithoutOverlapping trait is overriding initialize method:

trait WithoutOverlapping
{
    protected function initialize(InputInterface $input, OutputInterface $output)
    {
        $this->initializeMutex();
    }

    // ...
}

If your command is overriding initialize method too, then you should call initializeMutex method by yourself:

class Foo extends Command
{
    use WithoutOverlapping;

    protected function initialize(InputInterface $input, OutputInterface $output)
    {
        $this->initializeMutex();

        $this->bar = $this->argument('bar');
        $this->baz = $this->argument('baz');
    }

    // ...
}

Several traits conflict?

If you're using some other cool illuminated/console-% packages, well, then you can find yourself getting "traits conflict". For example, if you're trying to build loggable command, which is protected against overlapping:

class Foo extends Command
{
    use Loggable;
    use WithoutOverlapping;

    // ...
}

You'll get fatal error, the "traits conflict", because both of these traits are overriding initialize method:

If two traits insert a method with the same name, a fatal error is produced, if the conflict is not explicitly resolved.

But don't worry, solution is very simple. Just override initialize method by yourself, and initialize traits in required order:

class Foo extends Command
{
    use Loggable;
    use WithoutOverlapping;

    protected function initialize(InputInterface $input, OutputInterface $output)
    {
        $this->initializeMutex();
        $this->initializeLogging();
    }

    // ...
}