domotz-remote-pawn/src/modules/dhcpRequestsCounters.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/>.
 *
 *
 * Sends the counters of DHCP requests to the cloud,
 * Created by Stefano Cicero <stefano.cicero@domotz.com> on 19/06/23.
 */

const ONE_DAY = 86400;

module.exports.factory = function (resourceLocator) {
    const fileUtils = resourceLocator.utils.file;
    const lodash = resourceLocator.lodash;
    const os = resourceLocator.os;
    const path = resourceLocator.path;
    const time = resourceLocator.utils.time;
    const filename = path.join(os.tmpdir(), 'domotz_dhcp_requests.json');
    var dhcpRequests = [];
    var discoveredMacAddresses = {};
    function registerDHCPRequest(macAddress) {
        const ts = Math.floor(Date.now() / 1000);
        dhcpRequests.push({
            mac: macAddress,
            ts: ts,
        });

        discoveredMacAddresses[macAddress] = true;
    }

    function retrieveMacAddresses() {
        var macAddressesList = Object.keys(discoveredMacAddresses);
        discoveredMacAddresses = {};
        return macAddressesList;
    }

    function getDHCPRequest(fromTs) {
        return lodash.filter(dhcpRequests, function (value) {
            return value.ts > fromTs;
        });
    }

    function storeToFS() {
        const currentTs = time.getTimestamp();
        const dhcpRequestsFilter = getDHCPRequest(currentTs - ONE_DAY);
        fileUtils.writeFileSafe(filename, JSON.stringify(dhcpRequestsFilter));
    }

    function loadFromFS() {
        dhcpRequests = fileUtils.readFile(filename, JSON.parse) || [];
    }

    return {
        registerDHCPRequest: registerDHCPRequest,
        getDHCPRequest: getDHCPRequest,
        storeToFS: storeToFS,
        loadFromFS: loadFromFS,
        retrieveMacAddresses: retrieveMacAddresses,
    };
};