slm/queue-sqs

Zend Framework 2 module that integrates with Amazon SQS queuing system

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0.4.2 2014-10-27 20:25 UTC

README

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Version 0.4.0 Created by Jurian Sluiman and Michaël Gallego

Requirements

To-do

Feel free to help in those areas if you like this module !

  • Write more tests to assert the queue work as expected
  • Better error handling (currently, errors that may be returned by SQS client are completely ignored, we'd like to throw exceptions so that people can handle them in their code)
  • More support for programmatic queue handling: currently SlmQueueSqs offers very few options to create new queues (we assume people to create them from the Amazon Console or directly through the SDK). It may be useful to offer better integration so that SlmQueueSqs also offers a nice interface to create new queues.

Installation

First, install SlmQueue (instructions here). Then, add the following line into your composer.json file:

"require": {
    "slm/queue-sqs": "0.4.*"
}

Then, enable the module by adding SlmQueueSqs in your application.config.php file (you must also add the Aws key for enabling the AWS ZF2 module.

Starting from 0.3.0, SlmQueueSqs now internally uses the official AWS Zend Framework 2 module, so you can write your credentials only once for all AWS services.

Documentation

Before reading SlmQueueSqs documentation, please read SlmQueue documentation.

SlmQueueSqs does not offer any features to create queues. You should use the official SQS SDK or use the AWS console.

Setting your AWS credentials

Please refer to the documentation of the official AWS ZF2 module.

Setting metadata

Like other SlmQueue providers, you can set specific metadata to a job. Please note that this is different from the built-in message attributes that was introduced in SQS in May 2014. SlmQueueSqs does not support this currently, but this is very similar to the metadata in SlmQueue.

Please note that, when jobs are retrieved using the worker, some metadata pulled from SQS are automatically injected into your job. Therefore, you are encouraged to NOT use those keys, as your metadata will override SQS metadata:

  • id: this is the SQS message id.
  • receiptHandle: this is the SQS receipt handle, that is used to delete a job, among other thing.
  • md5: this is the MD5 signature of the message, calculated by AWS. You could use that to validate your messages.

Adding queues

SlmQueueSqs provides an interface for SQS queues that extends SlmQueue\Queue\QueueInterface, and provides in addition the following methods:

  • batchPush(array $jobs, array $options = array()): insert many jobs at once into the queue. Please note that if you need to specify options, the index key for both jobs and options must matched.
  • batchDelete(array $jobs): delete multiple jobs at once from the queue.

A concrete class that implements this interface is included: SlmQueueSqs\Queue\SqsQueue and a factory is available to create Sqs queues. Therefore, if you want to have a queue called "newsletter", just add the following line in your module.config.php file:

return array(
    'slm_queue' => array(
        'queue_manager' => array(
            'factories' => array(
                'newsletter' => 'SlmQueueSqs\Factory\SqsQueueFactory'
            )
        )
    )
);

This queue can therefore be pulled from the QueuePluginManager class.

Operations on queues

The name of the options match the names of the Amazon AWS SDK.

push / batchPush

Valid option is:

  • delay_seconds: the duration (in seconds) the message has to be delayed

Example:

$queue->push($job, array(
    'delay_seconds' => 20
));
pop

Valid options are:

  • visibility_timeout: the duration (in seconds) that the received messages are hidden from subsequent retrieve requests after being retrieved by a pop request
  • wait_time_seconds: by default, when we ask for a job, it will do a "short polling", it will immediately return if no job was found. Amazon SQS also supports "long polling". This value can be between 1 and 20 seconds. This allows to maintain the connection active during this period of time, hence reducing the number of empty responses.
batchPop

Valid options are:

  • max_number_of_messages: maximum number of jobs to return. As of today, the max value can be 10. Please remember that Amazon SQS does not guarantee that you will receive exactly this number of messages, rather you can receive UP-TO n messages.
  • visibility_timeout: the duration (in seconds) that the received messages are hidden from subsequent retrieve requests after being retrieved by a pop request
  • wait_time_seconds: by default, when we ask for a job, it will do a "short polling", it will immediately return if no job was found. Amazon SQS also supports "long polling". This value can be between 1 and 20 seconds. This allows to maintain the connection active during this period of time, hence reducing the number of empty responses.

Configuring queues

You may want to explicitly set queue URL instead of having it automatically fetched by its name (this can be useful if you want to use different queues in prod and test environments, while still referencing it using the same queue name in your code). To do so, add the following config:

return array(
    'slm_queue' => array(
        'queues' => array(
            'worker-queue' => array(
                'queue_url' => 'http://sqs.amazonaws.com/my-queue'
            )
        )
    )
);

Now, this URL will be reused instead of fetching it to AWS servers.

Executing jobs

SlmQueueSqs provides a command-line tool that can be used to pop and execute jobs. You can type the following command within the public folder of your Zend Framework 2 application:

php index.php queue sqs <queue> [--visibilityTimeout=] [--waitTime=]

The queue name is a mandatory parameter, while the other parameters are all optional:

  • visibilityTimeout: duration (in seconds) that the received messages are hidden from subsequent retrieve requests after being retrieved by a pop request
  • waitTime: wait time (in seconds) for which the call will wait for a job to arrive in the queue before returning