domotz-remote-pawn/src/events/handler/connectionCheck.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 Andrea Azzara <a.azzara@domotz.com> on 22/01/16.
 *
 */

const LOG_EVENT = 'HANDLER - (connectionCheck)';

function getSeconds(milliseconds) {
    return parseInt(milliseconds / 1000, 10);
}

var connectionCheck = function (resourceLocator) {

    var status = resourceLocator.status;

    if (status.get() !== status.CONFIGURED) {
        return;
    }

    console.info(LOG_EVENT);

    var fileName = process.env.DOMOTZ_CONF_DIR + '/connectivity_file';

    var fileUtils     = resourceLocator.utils.file;
    var spawn         = resourceLocator.utils.proc.spawn;
    var connectivity  = resourceLocator.networkTools.internetConnectionStatus;
    var configuration = resourceLocator.configuration;

    var engineClient = resourceLocator.engineRequest;

    var offlineDuration = null;
    var stats;
    /* If detached is false an external signal could be intercepted by the ping process and return an error, possible
     * source of false positives. */
    spawn('ping', ['-c', '4', configuration.ping_address || 'echo.domotz.com'], {detached: true})
        .then(function() {
            /* Ping successful */
            connectivity.setStatus(connectivity.states.ONLINE, null);
            stats = fileUtils.getFileStats(fileName);
            if (stats !== undefined && stats.isFile()) {
                offlineDuration = getSeconds(Date.now() - stats.ctime.getTime());
                console.info(LOG_EVENT + ': Status of Internet Connection ==> Recovered. ' +
                             'Has been offline for ' + offlineDuration);
                fileUtils.deleteFile(fileName);

                engineClient.sendWithPromise('/network/connection-recovery', 'POST', {lost_since: offlineDuration});

            } else {
                console.info(LOG_EVENT + ': Status of Internet Connection ==> OK');
            }
        })
        .catch(function() {
            console.warn(LOG_EVENT + ": Ping failed");
            stats = fileUtils.getFileStats(fileName);
            if (stats !== undefined && stats.isFile()) {
                var offlineDate = stats.ctime.toString();
                console.log(LOG_EVENT + ": A file exists. The Offline event was at " + offlineDate + " offline for " + offlineDuration);
                offlineDuration = getSeconds(Date.now() - stats.ctime.getTime());
                connectivity.setStatus(connectivity.states.OFFLINE, offlineDuration);
            } else {
                console.log(LOG_EVENT + ": First offline event, create file");
                var date = new Date();
                fileUtils.writeFile(fileName, date, true);
                connectivity.setStatus(connectivity.states.OFFLINE, 0);
            }
        });
};

module.exports.handler = connectionCheck;