iamqp
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RabbitMQ wrapper for NodeJS with several produce(reply)/consume scenarios
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<h1 class="page-title">fanout/fanout_consumer.js</h1>
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<article>
<pre class="prettyprint source linenums"><code>const MESSAGES = require('../internal').MESSAGES
/**
* Create a consumer for an exchange of the fanout type.
* Multiple fanout consumers can listen to a single fanout producer.
* Init example:
* <pre>
* const iamqp = require('iamqp');
* const amqpUri = 'amqp://localhost';
* const fanoutChannel = 'fanout-channel-a';
* let fanoutConsumer = new iamqp.FanoutConsumer(amqpUri, fanoutChannel);
*
* // This needs to be done or the errors will bubble up.
* fanoutConsumer.getEventer().on('error', (err) => {
* console.log('fanout consumer error:' + err.message);
* });
*
* // For when the connection is established.
* fanoutConsumer.getEventer().on('connected', () => {
* console.log('fanout consumer connected');
* });
*
* // Get messages as fanout by the producer.
* fanoutConsumer.getEventer().on('message', (message) => {
* console.log('fanout consumer message:' + message);
* });
*
* // Open the connection - this takes some time and is not sync
* fanoutConsumer.openConnection();
*
* // ...
*
* // Close the connection
* if (fanoutConsumer.closeConnection()) {
* console.log('fanout consumer connection closing ...');
* }
* </pre>
* ...
*/
class FanoutConsumer extends require('../common') {
/**
* @param {AmqpURI} amqpUri
* @param {ChannelName} channelName
* @param {Configuration} [configuration]
*/
constructor (amqpUri, channelName, configuration) {
super(amqpUri, channelName, configuration)
this._name = `FANOUT-CONSUMER: ${this._configuration.channelName}`
this._messageDispatcherWrapper('info', MESSAGES.INIT)
// Common class performs the connection
this._E.on('connected', () => {
this._createChannel()
})
}
/**
* Create a channel and assert a fanout exchange.
* @private
*/
_createChannel () {
this._amqp.connection.createChannel((channelCreatingErr, channelCreated) => {
if (channelCreatingErr) {
this._emitAndDispatchError(`${MESSAGES.CHANNEL_ERROR} -> ${channelCreatingErr.message}`)
return
}
this._messageDispatcherWrapper('info', `${MESSAGES.CHANNEL_READY} -> ${MESSAGES.EXCHANGE_ASSERTING} -> ${MESSAGES.FANOUT}`)
this._amqp.channel = channelCreated
this._amqp.channel.assertExchange(this._configuration.channelName, 'fanout', {
durable: false
})
this._assertQueue()
})
}
/**
* Assert the queue and bind the consumer function.
* @private
*/
_assertQueue () {
this._amqp.channel.assertQueue('', {
exclusive: true
}, (assertQueueErr, assertedQueue) => {
if (assertQueueErr) {
this._emitAndDispatchError(`${MESSAGES.QUEUE_ASSERTING} -> ${assertQueueErr.message}`)
return
}
this._messageDispatcherWrapper('info', `${MESSAGES.QUEUE_BIND} -> ${MESSAGES.CONSUMING}`)
this._amqp.channel.bindQueue(assertedQueue.queue, this._configuration.channelName, '')
this._amqp.channel.consume(assertedQueue.queue, (data) => {
this._logData(data, 'consume')
this._E.emit('message', this._parseConsumedMessage(data))
}, {
noAck: true
})
})
}
}
module.exports = FanoutConsumer
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