This is a simple little application that demonstrates an RPC capability over AMQP. It has 2 components.
server.js - a worker process that binds to a CloudAMQP Queue (dynamically creating the queue on an exchange defined in the source code). It pulls messages off the queue, using a functionName message header to determine which of the functions in the defined akana namespace to invoke. It then places the response from the invoked function on the replyto queue specified by the requestor.
client.js - a single invocation client that tests the RPC mechanism by putting the second command line argument into a message, and setting the functionName header to the first command line argument.
The project includes a Procfile used by Heroku to define server.js as a worker dyno.
There's a nice turorial on how to use node in Heroku here. In a nutshell you need to install the Heroku toolbelt, then run heroku login, git clone, cd into the cloned folder, heroku create to define a Heroku app,git push heroku master to deploy it, and then use heroku ps:scale web=0 and heroku ps:scale worker=1 to configure the app to run only the worker.
Alternatively you can simply run the worker process locally with node server.js. If you're going to run this locally you will need to install amqplib with npm install amqplib. You'll also need to replace the AMQP URL with the URL of your AMQP service (very easy to use CloudAMQP if you don't have your own) in both the server and client code.
Test it using the client app, it takes two params, the function name and the function's input. For example you can simply execute node client.js fibonaaci 10. That's that.