domotz-remote-pawn/src/commands/tcpRequest.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 Georgi Tsatsev <gtsatsev@domotz.com> on 26/07/16.
 *
 */

var tcpRequest = function (message, resourceLocator) {

    var tcp        = resourceLocator.net;
    var cmdUtils   = resourceLocator.utils.command;

    var payload    = message.payload;

    var host       = payload.host;
    var port       = payload.port;
    var msg        = payload.message;
    var timeout    = payload.timeout;
    var encoding   = payload.encoding;

    return {
        execute: function (callback) {
            var id;
            var connection = tcp.createConnection(port, host, function() {
                connection.write(msg, encoding);
                console.verbose('Message %s with encoding: %s, sent to %s:%d', msg.toString(encoding),
                    encoding,
                    host,
                    port)
            });;

            connection.on('close', function (){
                console.debug('TCP connection to host %s closed', host);
            });

            connection.on('data', function (msg) {
                console.debug('Received %d bytes', msg.length);
                console.verbose('Message: %s', msg.toString(encoding));
                callback(cmdUtils.getResponse(msg.toString(encoding), null));
                clearTimeout(id);
                connection.destroy();
            });

            connection.on('error', function (error) {
                console.error('TCP error - Error: {}' + error.message);
                console.error(error.stack);
                callback(cmdUtils.getResponse(null, error));
                connection.destroy();
            });

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



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


module.exports.command = tcpRequest;