Workling support for Synchronous AMQP RabbitMQ Clients and Amazon SQS Queues

As a part of contracting work I have been doing for TouchLocal, I have just opensourced some code I wrote to support new Workling clients. As you may know, Workling is a Rails-oriented system for performing asynchronous processing and optionally returning data from these background workers. However, because of the implementation of the original AMQP client, you could not use RabbitMQ queues from non-evented Mongrel or Phusion Passenger servers (only evented Mongrel or Thin).

Building on the work of celdee-bunny and famoseagle-carrot, I implemented a RabbitMQ workling client that could be used from within Phusion Passenger and Mongrel. The Synchronous AMQP Workling client allows RabbitMQ to be used from Workling without requiring complicated changes to deployment scenarios. Also, I implemented the Return Store functionality, so that RabbitMQ users can get data back from the workers, just like when using Starling.

Additionally, it was useful at the time to add support for an Amazon SQS Workling client, more as an exercise in testing its performance than anything else. As with the SyncAmqpClient, support for the Return Store is present. One of the discoveries in working with Amazon SQS (via the RightAws gem) was the discovery that the default key structure for Workling (which uses colon characters for segment delimiters) is not supported by Amazon. As a result, if you define the keys used for AWS configuration, even if you don’t use them, they will change the Workling key structure. This is not a problem for new implementations, but for existing deployments adding this will mean that Workling cannot see the old queues and you may not be able to access them without removing the AWS configuration… not a deal breaker, but something to be aware of.

So, the TouchLocal github account holds the version of Workling that has these two implementation for now, at least until my pull request to the main branch is accepted :)

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