iamqp
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RabbitMQ wrapper for NodeJS with several produce(reply)/consume scenarios
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<h1 class="page-title">plain/plain_consumer.js</h1>
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<pre class="prettyprint source linenums"><code>const MESSAGES = require('../internal').MESSAGES
const _get = require('lodash/get')
/**
* Plain consumer.
* One plain consumers can listen to many plain producers.
* Init example:
* <pre>
* const iamqp = require('iamqp');
* const amqpUri = 'amqp://localhost';
* const channel = 'amqp-channel-b';
* let plainConsumer = new iamqp.PlainConsumer(amqpUri, channel);
*
* // This needs to be done or the errors will bubble up.
* plainConsumer.getEventer().on('error', (err) => {
* console.log('consumer error:' + err.message);
* });
*
* // For when the connection is established.
* plainConsumer.getEventer().on('connected', () => {
* console.log('consumer connected');
* });
*
* // Get messages.
* plainConsumer.getEventer().on('message', (message) => {
* console.log('consumer message:' + message);
* });
*
* // Open the connection - this takes some time and is not sync
* plainConsumer.openConnection();
*
* // ...
*
* // Close the connection
* if (plainConsumer.closeConnection()) {
* console.log('consumer connection closing ...');
* }
* </pre>
* ...
*/
class PlainConsumer extends require('../common') {
/**
* @param {AmqpURI} amqpUri
* @param {ChannelName} channelName
* @param {Configuration} [configuration]
*/
constructor (amqpUri, channelName, configuration) {
super(amqpUri, channelName, configuration)
this._name = `PLAIN-CONSUMER: ${this._configuration.channelName}`
this._messageDispatcherWrapper('info', MESSAGES.INIT)
this._E.on('connected', () => {
this._amqp.connection.createChannel((channelCreatingErr, channelCreated) => {
if (channelCreatingErr) {
this._emitAndDispatchError(`${MESSAGES.CHANNEL_ERROR} -> ${channelCreatingErr.message}`)
return
}
this._messageDispatcherWrapper('info', `${MESSAGES.CHANNEL_READY} -> ${MESSAGES.QUEUE_ASSERTING} -> ${MESSAGES.CONSUMING}`)
this._amqp.channel = channelCreated
this._amqp.channel.assertQueue(this._configuration.channelName, {
arguments: _get(this._configuration, 'configuration.queueArguments', {})
})
this._amqp.channel.consume(this._configuration.channelName, (data) => {
this._logData(data.content, 'consume')
this._amqp.channel.ack(data)
this._E.emit('message', this._parseConsumedMessage(data))
})
})
})
}
}
module.exports = PlainConsumer
</code></pre>
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