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README.md

RabbitMQ C Client Demo

What?

A proof-of-concept program which demonstrates how to read messages from a RabbitMQ message queue using the librabbitmq C library.

Why?

A few years ago, I worked on a (very exciting) project whose front-end was an openFrameworks application. Due to time/resource constraints, the developers were unable to get the ofx application to pull messages directly from the back-end's message queue. We ended up hacking together a Rube Goldberg solution -- a Ruby program which read messages from RabbitMQ and passed them to the ofx application via OSC -- which wound up being good enough. (For anyone who may be interested in reading more about the problems we faced and the solutions we came up with, a case study is available on my website.)

That all being said, I've always wanted to revisit this project and try writing a C program to pull messages from the RabbitMQ message queue. Since I've recently been brushing up on C, I thought now would be a good time to try.

Go on ...

My demo relies heavily on the amqp_listen example provided by the rabbitmq-c project. The (marginally) interesting modifications include: use of environment variables, client authentication and storing the contents of message bodies for use in other parts of the program (in the program mentioned above, the message body would be used to determine which set of videos should be shown on the display wall). These are admittely all pretty trivial, but I feel good about the experience: the program itself, reading through the library's source, working with the C toolchain, etc.

I'm ready to call this experiment a success. I was able to sucessfully resurrect the project's back-end and get the demo authenticating against and pulling messages off the queue.

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