Using RabbitMQ with Ruby and Node.js apps? - ruby-on-rails

Question

I'm using the Bunny gem in Rails and AMQP in Node.js.
Rails is the publisher and the Node.js app is a subscriber.
Code from Rails:
conn = Bunny.new
conn.start
ch = conn.create_channel
x = Bunny::Exchange.new(ch, :direct, "messenger")
q1 = ch.queue("new_messages").bind(x, :routing_key => 'send')
x.publish('hi', :routing_key => 'send')
Code from Node.js:
var amqp = require('amqp');
var connection = amqp.createConnection();
connection.addListener('ready', function(){
var exchange = connection.exchange('messenger');
var queue = connection.queue('new_messages')
queue.bind('messenger', 'send')
queue.subscribe( {ack:true}, function(message){
console.log(message.data.toString())
queue.shift()
});
});
From the management plugin I can see that the Rails code works well, but the code from Node.js doesn't make sense.
Where is my mistake?

Answer 1

The main issue is in how you're attempting to bind your queue to the 'messenger' exchange. You've already used the exchange name to get a reference to the exchange object. Rather than pass in the string name again when binding the queue to the exchange, pass this reference into queue.bind(). Simply change the first queue.bind() argument:
var exchange = connection.exchange('messenger');
var queue = connection.queue('new_messages');
// Use the reference to the exchange object you just received;
// pass it in here instead of the exchange's name
queue.bind(exchange, 'send');
EDIT
Here is a full, working example; just drop in your own connection properties:
var amqp = require('amqp');
var connection = amqp.createConnection({
host: 'my_host',
login: 'my_login',
password: 'my_password',
authMechanism: 'AMQPLAIN',
vhost: 'my_vhost'
});
connection.addListener('ready', function(){
console.log('ready');
var exchange = connection.exchange('messenger');
var queue = connection.queue('new_messages');
queue.bind(exchange, 'send');
// if message successfully received, print message
queue.subscribe( {ack:true}, function(message){
console.log(message.data.toString());
queue.shift();
});
// test by sending a message
exchange.publish('send', 'this is a test message', {}, function() {})
});
Cheers.