Having a problem where running on the server in Meteor, only the first callback parameter is received. Running at Node console correctly returns all the parameters for the callback. I've left out some code that ensures the RabbitMQ server is ready for brevity.

MeteorMessageCount.js

AMQP = Npm.require("amqp");

rabbitMQ = AMQP.createConnection({ host: '127.0.0.1' });

rabbitMQ.queue('foo', {durable:true, autoDelete:false}, function (queue, messages, consumers) {
  console.log('Queue ' + queue.name + ' is open with ' + messages + ' messages');
});

/* Queue foo is open with undefined messages */

NodeMessageCount.js

AMQP = require("amqp");

rabbitMQ = AMQP.createConnection({ host: '127.0.0.1' });

rabbitMQ.queue('foo', {durable:true, autoDelete:false}, function (queue, messages, consumers) {
  console.log('Queue ' + queue.name + ' is open with ' + messages + ' messages');
});

/* Queue foo is open with 3 messages */