README

A module for sending and consuming SQS tasks. Can be configured to work as the trigger for queuejobs.

When used as the queuedjobs handler, there's a few slight changes to how queuedjobs are run - aside from not needing Cron jobs anymore.

On calling QueuedJobService->queueJob, a message is sent to SQS
A consumer picks up that message, then processes that job ID
All "type 1" aka immediate jobs are subsequently processed in that execution thread
If the added job is meant to be run in the future, the handler sets the job type to 'Scheduled'.
A separate SQS task runs that looks for any jobs of type "Scheduled" and executes those
That task re-queues itself for to run again in 30 seconds time
The "Scheduled" task runner will also look for any job currently sitting in the "wait" status; this is how paused jobs get picked up for further execution without needing to trigger another SQS message

Configuration for use as the queuejobs handler

---
Name: jobrunner
After: queuedjobs
---
SilverStripe\Core\Injector\Injector:
  QueueHandler:
    class: Symbiote\SqsJobQueue\Service\SqsQueueHandler
    properties:
      sqsService: '%$SqsService'
  SqsClient:
    class: Aws\Sqs\SqsClient
    constructor:
      connection_details: 
        region: ap-southeast-2
        version: latest
        credentials: 
          key: YourKey
          secret: YourSecret

That expects a queue to exist with the name 'jobqueue' - if the queue name is different,

SilverStripe\Core\Injector\Injector:
  SqsService:
    properties:
      queueName: your-queue-name

Writing a task

Define a class with a method in it. This is the task runner; no need for any specific implementations.

namespace \Whatever\Class\Implements;

class Work {

    public function doStuff() {

    }
}

Add configuration to your project that binds the method name to the SqsService

SilverStripe\Core\Injector\Injector:
  MyJobName: 
    class: \Whatever\Class\Implements\Work
  SqsService:
    properties:
      handlers: 
        doStuff: %$MyJobName

Triggering tasks

To trigger a task, the call

$sqsService->sendSqsMessage(['args' => ['param1', 'param2']], 'taskName');

for convenience, SqsService implements a __call() method that remaps a call like

$sqsService->taskName($arg1, $arg2)

into

$sqsService->sendSqsMessage(['args' => [$arg1, $arg2']], 'taskName');

sendSqsMessage in turn converts this into a message structure such as

$message = [
    'message' => [
        'args' => [$arg1, $arg2'],
        'handler' => 'taskName',
    ]
];

$sqsMessage = [
    'QueueUrl' => 'sqs://in.amazon'
    'MessageBody' => json_encode($message)
];

So, to manually trigger the messages, create the $sqsMessage structure from your own code, and send using $this->client->sendMessage($sqsMessage);

Running

php vendor/symbiote/silverstripe-sqs-jobqueue/sqs-worker.php

Development environments

If you don't have SQS available, you can run a file-based queue system by swapping out the AWS queue for the file based SQS queue.

---
Name: local_sqs_config
After: '#sqs_config'
---
SilverStripe\Core\Injector\Injector:
  SqsService:
    properties:
      client: '%$FileSqsClient'
  FileSqsClient:
    class: Symbiote\SqsJobQueue\Service\FileBasedSqsQueue

By default, this will create serialised data in sqs-jobqueue/code/service/.queueus (configurable on the FileBasedSqsQueue class).

Run sqs-worker as before.

Docker

If you're using https://github.com/symbiote/docker-runtime, this will spin up an sqsrunner container for you that runs the sqs-worker automatically.

Troubleshooting

So for a project, your config may look something like this where it defaults to the file-based queue system only for test environments:

---
Name: prod_sqs
After: '#sqs_config'
---
SilverStripe\Core\Injector\Injector:
  Symbiote\SqsJobQueue\Service\SqsService:
    properties:
      client: '%$SqsClient'
  SqsClient:
    class: Aws\Sqs\SqsClient
    constructor:
      connection_details:
        region: ap-southeast-2
        version: latest
---
Name: dev_sqs
After: '#sqs_config'
Only:
  environment: test
---
SilverStripe\Core\Injector\Injector:
  Symbiote\SqsJobQueue\Service\SqsService:
    properties:
      client: '%$Symbiote\SqsJobQueue\Service\FileBasedSqsQueue'

In the production environment you will still need to provide the credentials using local config.

To get the file-based queue system working, your local config will need something like this:

---
Name: jobrunner
After: 
  - queuedjobs
---
SilverStripe\Core\Injector\Injector:
  QueueHandler:
    class: Symbiote\SqsJobQueue\Service\SqsQueueHandler
    properties:
      sqsService: '%$Symbiote\SqsJobQueue\Service\SqsService'
  Symbiote\SqsJobQueue\Service\SqsService:
    properties:
      queueName: '%sqs_jobqueue_name%'
---
Name: sqs_location
After: '#sqs_config'
---
SilverStripe\Core\Injector\Injector:
  Symbiote\SqsJobQueue\Service\FileBasedSqsQueue:
    properties:
      queuePath: /var/www/html/mysite/fake-sqs-queues

The important part is making sure /var/www/html/mysite/fake-sqs-queues is writable since that's where your queued jobs will be written to.

Docker Testing

The simplest way to test this once all your configs are in place is to:

Queue up a job (e.g. using the https://github.com/symbiote/silverstripe-queuedjobs/ module)
Ensure a file is written to /var/www/html/mysite/fake-sqs-queues
Run docker logs sqsrunner to see whether it picked up the job
View the queued jobs admin to ensure the job was completed

silverstripe-australia / silverstripe-sqs-jobqueue

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