work-q
v1.0.0
Published
Worker queue interface for AMQP
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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 nack
ed 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