amqplib/examples/tutorials/receive_logs_direct.js

An AMQP 0-9-1 (e.g., RabbitMQ) library and client.

#!/usr/bin/env node

var amqp = require('amqplib');
var all = require('bluebird').all;
var basename = require('path').basename;

var severities = process.argv.slice(2);
if (severities.length < 1) {
  console.warn('Usage: %s [info] [warning] [error]',
               basename(process.argv[1]));
  process.exit(1);
}

amqp.connect('amqp://localhost').then(function(conn) {
  process.once('SIGINT', function() { conn.close(); });
  return conn.createChannel().then(function(ch) {
    var ex = 'direct_logs';

    var ok = ch.assertExchange(ex, 'direct', {durable: false});

    ok = ok.then(function() {
      return ch.assertQueue('', {exclusive: true});
    });

    ok = ok.then(function(qok) {
      var queue = qok.queue;
      return all(severities.map(function(sev) {
        ch.bindQueue(queue, ex, sev);
      })).then(function() { return queue; });
    });

    ok = ok.then(function(queue) {
      return ch.consume(queue, logMessage, {noAck: true});
    });
    return ok.then(function() {
      console.log(' [*] Waiting for logs. To exit press CTRL+C.');
    });

    function logMessage(msg) {
      console.log(" [x] %s:'%s'",
                  msg.fields.routingKey,
                  msg.content.toString());
    }
  });
}).catch(console.warn);