work-q

Worker queue interface for AMQP

Install

$ npm install --save work-q

Usage

const Worker = require('work-q')
const worker = Worker({
  connection: 'amqp://localhost'  
})

worker.connect(function (err) {
  if (err) return fail(err)

  worker.listen('my-queue', function (err) {
    if (err) return fail(err)
  })
})

worker.on('data', function (queue, data, callback) {
  console.log('new message on ' + queue)
  console.log(JSON.stringify(data))
  callback()
})

function fail (err) {
  console.error(err)
  return process.exit(1)
}

API

Worker(options) -> worker

Constructs a new worker.

options

Options for configuring the worker's behavior.

connection

Required
Type: string

An AMQP connection string.

parse

Type: function
Default: JSON.parse

A function used to parsed the inbound messages.

worker.connect(callback) -> undefined

Connects to the AMQP server and establishes a channel.

callback

Required
Type: function
Arguments: err

A callback to be called when the connection and channel are established and usable.

worker.close(callback) -> undefined

Closes the worker connection.

callback

Required
Type: function
Arguments: err

A callback to be called when the connection is closed.

worker.listen(queue, callback) -> undefined

Listens on new messages in a queue.

queue

Required
Type: string

The queue to consume.

callback

Required
Type: function
Arguments: err

A callback to be called when the worker is listening on the queue.

worker.unlisten(queue, callback) -> undefined

Stops listening on new messages in a queue.

queue

Required
Type: string

The queue name previously passed to worker.listen.

callback

Required
Type: function
Arguments: err

A callback to be called when the worker is no longer listening on the queue.

worker.ping(callback) -> undefined

Asserts a temporary, auto-deleted queue to verify that the connection is usable.

callback

Required
Type: function
Arguments: err

A callback to be called when the ping is complete.

worker.on('data', callback) -> worker

Listens on new data on all active queues.

callback

Required
Type: function
Arguments: queue, data, done

A callback to be called with inbound data.

queue

Type: string

The queue that received the message.

data

Type: any

The parsed message data.

done

Type: callback Arguments: err

A callback you must call to acknowledge the message. If an error is passed, the message will be nacked and either placed into the dead-letter queue or re-queued, depending on your configuration.

worker.on('error', callback) -> worker

Emitted when the incoming message cannot be parsed. This event must be handled or your process will exit when it's emitted.

License

MIT © Ben Drucker