domotz-remote-pawn/src/commands/udpRequest.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 Tommaso Latini <tommaso@domotz.com> on 31/03/15.
 *
 */

var udpRequest = function (message, resourceLocator) {

    var udpUtils   = resourceLocator.udp.utils;
    var cmdUtils   = resourceLocator.utils.command;

    var payload    = message.payload;

    var host       = payload.host;
    var port       = payload.port;
    var hexMessage = payload.hex_message;
    var burst      = payload.burst;
    var timeout    = payload.timeout;

    return {
        execute: function (callback) {
            var id;
            var socket = udpUtils.createSocket();
            var buffer = udpUtils.decode(hexMessage);

            socket.on('listening', function () {
                udpUtils.logListening(socket);
            });

            socket.on('close', function() {
                udpUtils.logClose('client');
            });

            socket.on('message', function (msg, rinfo) {
                udpUtils.logMessage(msg, rinfo);
                callback(cmdUtils.getResponse(msg.toString("utf-8"), null));
                clearTimeout(id);
                socket.close();
            });

            socket.on('error', function (error) {
                udpUtils.logError(error);
                callback(cmdUtils.getResponse(null, error));
                socket.close();
            });

            id = setTimeout(function() {
                console.debug('TIMEOUT - Closed UDP socket after ' + timeout +
                    ' milliseconds');
                callback(cmdUtils.getResponse(null, 'Timeout'));
                socket.close();
            }, timeout);

            udpUtils.send(socket, buffer, host, port, burst);

        },
        describe: function () {
            return message.correlationId + " - udpRequest - " + host +
                ':' + port + ' - ' + hexMessage.length + ' packets';
        }
    };
};

module.exports.command = udpRequest;