Jackrabbit

Simple AMQP / RabbitMQ job queues for node

var queue = jackrabbit('amqp://localhost');

queue.on('connected', function() {
  queue.create('jobs.greet', { prefetch: 5 }, onReady);

  function onReady() {
    queue.handle('jobs.greet', onJob);
    queue.publish('jobs.greet', { name: 'Hunter' });
  }

  function onJob(job, ack) {
    console.log('Hello, ' + job.name);
    ack();
  }
});

Installation

npm install --save jackrabbit

var jackrabbit = require('jackrabbit');

Use

First, create a queue and connect to an amqp server:

var queue = jackrabbit(amqp_url, prefetch)

amqp_url: eg, 'amqp://localhost'
prefetch: messages to prefetch (default = 1)

create

Create (or assert) a queue.

queue.create(name, options, callback)

name: name of the queue (eg, 'jobs.scrape')
options: object with...
- durable (Boolean, default = true)
- prefetch (Number, default = 1)
callback: callback function for result (err, queue_instance, queue_info)

destroy

Destroy a queue.

queue.destroy(name, callback)

name: name of the queue
callback: callback for result (err, destroyed)

You can destroy queues that exist or don't exist; if you try to destroy a queue that doesn't exist, destroyed = false. If a queue was destroyed, destroyed = true.

publish

Publish a job to a queue.

queue.publish(name, message)

name: name of the queue
message: an Object that is your message / job to add to the queue

handle

Start handling jobs in a queue.

queue.handle(name, handler)

name: name of the queue
handler: a Function to receive jobs (job, ack)

Jobs must be acknowledged. You can either ack immediately (so all jobs will be run at most once) or you can ack on job completion (so all jobs will run at least once).

ignore

Stop handling a queue.

queue.ignore(name)

name: name of the queue

purge

Purge a queue.

queue.purge(name, callback);

name: name of the queue
callback: Function to be called on completion with (err, countOfPurgedMessages)

Tests

Run rabbit on 'amqp://localhost'
npm test

createproblem/jackrabbit