domotz-remote-pawn/src/amqp/handler.js

Domotz Agent

/** This file is part of Domotz Agent.
  * Copyright (C) 2016  Domotz Ltd
  *
  * Domotz Agent is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * (at your option) any later version.
  *
  * Domotz Agent is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Domotz Agent.  If not, see <http://www.gnu.org/licenses/>.
  **/
/**
 *
 * Created by Iacopo Papalini <ipapalini@domotz.com> on 17/09/15.
 */

var factory = function(command) {

    function processMessage(channel, amqpMessage) {
        var message, cid, replyTo;
        var actualCommand, actualCb;
        if (amqpMessage) {
            message = JSON.parse(amqpMessage.content.toString());
            cid = amqpMessage.properties.correlationId;
            replyTo = amqpMessage.properties.replyTo;
        } else {
            throw new Error('MESSAGE - Received an empty message');
        }
        console.debug('MESSAGE - (%s): Received', cid);
        console.verbose(amqpMessage.content.toString());
        message.correlationId = cid;
        actualCommand = command.createCommandFromMessage(message);
        actualCb = command.callback;
        console.info("MESSAGE - (%s): %s", cid, actualCommand.describe());
        actualCommand.execute(function (payload) {
            var buffer = actualCb(payload);
            console.info('MESSAGE - (%s): Sending reply on queue %s - size in bytes: %d', cid, replyTo, buffer.length);
            channel.publish('', replyTo, buffer, {correlationId: cid});
        });
    }

    return {
        processMessage: processMessage
    };
};


module.exports.factory = factory;