This provides queue component for Yii2.

The preferred way to install this extension is through composer.

Either run

php composer.phar require --prefer-dist urbanindo/yii2-queue "*"

or add

"urbanindo/yii2-queue": "*"

to the require section of your composer.json file.

After the installation, first step is to set the console controller.

return [
    // ...
    'controllerMap' => [
        'queue' => 'UrbanIndo\Yii2\Queue\Console\Controller'
    ],
];

For the task worker, set a new module, e.g. task and declare it in the config.

'modules' => [
    'task' => [
        'class' => 'app\modules\task\Module',
    ]
]

And then set the queue component. Don't forget to set the module name that runs the task in the component. For example, queue using AWS SQS

'components' => [
    'queue' => [
        'class' => 'UrbanIndo\Yii2\Queue\SqsQueue',
        'module' => 'task',
        'url' => 'https://sqs.ap-southeast-1.amazonaws.com/123456789012/queue',
		'config' => [
			'key' => 'AKIA1234567890123456',
			'secret' => '1234567890123456789012345678901234567890',
			'region' => 'ap-southeast-1',
			'version' => 'latest'
        ],
    ]
]

Creating a worker is just the same with creating console or web controller. In the task module create a controller that extends UrbanIndo\Yii2\Queue\Worker\Controller

e.g.

class FooController extends UrbanIndo\Yii2\Queue\Worker\Controller {

    public function actionBar($param1, $param2){
        echo $param1;
    }
}

To prevent the job got deleted from the queue, for example when the job is not completed, return false in the action. The job will be run again the next chance.

e.g.

class FooController extends UrbanIndo\Yii2\Queue\Worker\Controller {

    public function actionBar($param1, $param2){
        try {
        } catch (\Exception $ex){
            \Yii::error('Ouch something just happened');
            return false;
        }
    }
}

To run the listener, run the console that set in the above config. If the controller mapped as queue then run.

yii queue/listen

To post a job from source code, put something like this.

use UrbanIndo\Yii2\Queue\Job;

$route = 'foo/bar';
$data = ['param1' => 'foo', 'param2' => 'bar'];
Yii::$app->queue->post(new Job(['route' => $route, 'data' => $data]));

Job can also be posted from the console. The data in the second parameter is in JSON string.

yii queue/post 'foo/bar' '{"param1": "foo", "param2": "bar"}'

Job can also be posted as anonymous function. Be careful using this.

Yii::$app->queue->post(new Job(function(){
    echo 'Hello World!';
}));

In this queue, there is a feature called Deferred Event. Basically using this feature, we can defer a process executed after a certain event using queue.

To use this, add behavior in a component and implement the defined event handler.

    public function behaviors() {
        return array_merge([
            [
                'class' => \UrbanIndo\Yii2\Queue\Behaviors\DeferredEventBehavior::class,
                'events' => [
                    self::EVENT_AFTER_VALIDATE => 'deferAfterValidate',
                ]
            ]
        ]);
    }

    public function deferAfterValidate(){
        //Do something here.
    }

NOTE Due to reducing the message size, the $event object that usually passed when triggered the event will not be passed to the deferred event. Also, the object in which the method invoked is merely a clone object, so it won't have the behavior and the event attached in the original object.

As for ActiveRecord class, since the object can not be passed due to limitation of SuperClosure in serializing PDO (I personally think that's bad too), the behavior should use \UrbanIndo\Yii2\Queue\Behaviors\ActiveRecordDeferredEventBehavior instead. The difference is in the object in which the deferred event handler invoked.

Since we can not pass the original object, the invoking object will be re-fetched from the table using the primary key. And for the afterDelete event, since the respective row is not in the table anymore, the invoking object is a new object whose attributes are assigned from the attributes of the original object.

We can use web endpoint to use the queue by adding \UrbanIndo\Yii2\Queue\Web\Controller to the controller map.

For example

    'controllerMap' => [
        'queue' => [
            /* @var $queue UrbanIndo\Yii2\Queue\Web\Controller */
            'class' => 'UrbanIndo\Yii2\Queue\Web\Controller',
        ]
    ],

To post this use

curl -XPOST http://example.com/queue/post --data route='test/test' --data data='{"data":"data"}'

To limit the access to the controller, we can use \yii\filters\AccessControl filter.

For example to filter by IP address, we can use something like this.

    'controllerMap' => [
        'queue' => [
            /* @var $queue UrbanIndo\Yii2\Queue\Web\Controller */
            'class' => 'UrbanIndo\Yii2\Queue\Web\Controller',
            'as access' => [
                'class' => '\yii\filters\AccessControl',
                'rules' => [
                    [
                        'allow' => true,
                        'ips' => [
                            '127.0.0.1'
                        ]
                    ]
                ]
            ]
        ]
    ],

To run the tests, in the root directory execute below.

./vendor/bin/phpunit

• Add more queue provider such as MySQL, Redis, MemCache, IronMQ, RabbitMQ.
• Add priority queue.