domotz-remote-pawn/src/discovery/snmp/communities.js

Domotz Agent

/** This file is part of Domotz Agent.
 * Copyright (C) 2016  Domotz UK LLP
 *
 * 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/>.
 *
 * Memory persistence of the mac<->snmp community association
 *
 * Created by Iacopo Papalini <iacopo@domotz.com> on 12/09/2017.
 */

var communitiesProviderFactory = function (resourceLocator) {
    'use strict';
    var q = require('q');
    var myConsole = resourceLocator.log.decorateLogs();
    var engineRequest = resourceLocator.engineRequest;
    var communities = {
        mac: null,
    };

    var invalidate = function () {
        communities.mac = null;
    };

    var get = function () {
        if (communities.mac !== null) {
            myConsole.debug('Cache Hit, returning communities');
            return q(communities.mac);
        } else {
            myConsole.debug('Fetching communities list from engine');
            return engineRequest.sendWithPromise('/device/snmp-community', 'GET').then(function (data) {
                myConsole.debug('Communities list fetched from engine, %s elements', data.length);
                communities.mac = {};
                data.forEach(function (device) {
                    communities.mac[device.mac] = device;
                    delete device.mac;
                });
                return communities.mac;
            });
        }
    };
    return {
        invalidate: invalidate,
        get: get,
    };
};

module.exports.communitiesProviderFactory = communitiesProviderFactory;