Download the PHP package mamitech/laravel-sqs-subscriber without Composer

Usage

Add the library into your composer' dependencies

Then, publish the configureation:

at this point you should see a new file named sqs-topic-map.php in your config/ directory. If you experience a weirdness that somehow don't see this new file (see link), please re-run vendor:publish without parameter:

and select the number with Provider: Mamitech\LaravelSqsSubscriber\ServiceProvider. Now you should have sqs-topic-map.php in your config.

Configuration

In mamikos we have a standardization about how a message should be formatted to be put into queue, read: message format. By looking into the 'topic' field, we can see what is the message about.

Define the mapping between topic and a class in your code

In config/sqs-topic-map.php, specify the mapping between topics to classes that will handle the message. Your class should have a handle method receiving one message parameter. message would contains either string or array depending on how the string inside the queue is being encoded. If it's a proper json encoded string then it would be an array, otherwise it would be string. For details see example below.

Add a new connector using sqs-distributed driver into your config/queue.php

Now you will need a new queue connection using the new driver called sqs-distributed that is provided by this library. Please note that we are using sqs-distributed terms for the new driver here to get a sense that the message is published and consumed by different services instead of how laravel' original queue works - laravel original queue can only works if the publisher and subscriber comes from the same service.

See example on the following section.

Example

Suppose that you have a queue in Amazon SQS named user-registration. An example of the message inside the queue looks like this:

Here's what you need to do.

Add new connection in your config/queue.php

Add the new connection inside your queue config using sqs-distributed as driver value:

note that in the new connection you will use sqs-distributed as driver value. To keep the consistency we also name the connection as sqs-distributed as the name of it's driver. You can also specify the default queue inside queue key that will be used when you don't specify particular queue to listen to.

Map topic to class handler in config/sqs-topic-map.php

Then you should specify which class would handle each topic in your config/sqs-topic-map.php:

you must have the corresponding class inside app\Worker\UserVerifiedListener.php, this class must have a handle method.

Make sure the class handler has method 'handle' to receive the message.

Everytime there is a new message in the user-registration queue with topic of user-verified, laravel will spawn a new instance of App\Worker\UserVerifiedListener and call method handle of it by passing a $message parameter. This $message can be of any type from int, float, string or array. It depends on the value inside message key in your queue message.

In the case of $message containing an array as in example above, then you can directly access array data inside it using $message['user']. This is because when passing the parameter to handle, the library will first decode the message using json_decode.

Run the worker

Now it's time to run the worker to consume and handle messages inside the queue. Because this library utilize laravel' original queue handler, we can simply run the queue worker as usual by specifying which connection we want to run the worker for.

In our case, the connection would be sqs-distributed, so the command to run the worker is:

The command above will run the worker to listen to sqs-distributed with default queue. If you want to specify specific queue or even multiple queue to listen to, you can add --queue parameter as described in laravel documentation

That's it! now your worker will consume the message from Amazon SQS. Just make sure that your worker has a supervisor program such as systemd to run it so that when something unexpectedly happened and crash the worker, it will automatically be restarted.