domotz-remote-pawn/src/network_tools/jamDevicesFileManager.js

Domotz Agent

var jamDevicesFileManager = function (macListFile, myConsole) {
    'use strict';
    var fs = require('fs');
    var previousMacAddresses = null;
    var internetPauseAvailable = null;
    var INTERNET_PAUSE_SUFFIX = ',internet-pause';

    function listChanged(macAddresses) {
        if (!previousMacAddresses) {
            return true;
        }
        if (macAddresses.length !== previousMacAddresses.length) {
            return true;
        } else {
            for (var i = macAddresses.length; i-- > 0; ) {
                if (macAddresses[i] !== previousMacAddresses[i]) {
                    return true;
                }
            }
        }
        return false;
    }

    function writeFile(contents) {
        myConsole.debug('Synchronously writing file %s', macListFile);
        try {
            fs.writeFileSync(macListFile, contents + '\n');
            myConsole.debug('File written %s (%s)', macListFile, JSON.stringify(contents));
            return contents.length > 0;
        } catch (e) {
            myConsole.error('Cannot write file %s, killing fing', macListFile);
            return false;
        }
    }

    function writeFileIfListChanged(macAddresses) {
        /**
         * Using the macAddresses list, writes its contents in the macListFile.
         * @returns boolean true if the fing process should run after the update
         */
        if (listChanged(macAddresses)) {
            myConsole.info('Jammed device list changed');
        } else {
            return macAddresses.length > 0;
        }
        previousMacAddresses = macAddresses;

        var contents = '';
        if (internetPauseAvailable && macAddresses.length > 0) {
            contents = macAddresses.join(INTERNET_PAUSE_SUFFIX + '\n') + INTERNET_PAUSE_SUFFIX;
        } else {
            contents = macAddresses.join('\n');
        }
        return writeFile(contents);
    }

    function setInternetPauseAvailable(value) {
        myConsole.info('Setting internet pause availability as: %s', value);
        internetPauseAvailable = value;
    }

    function isInternetPauseAvailable() {
        /*
         * returns null if the information is not available yet,
         * true for versions >= 4.x, false otherwise
         *
         * */
        return internetPauseAvailable;
    }

    return {
        write: writeFileIfListChanged,
        setInternetPauseAvailable: setInternetPauseAvailable,
        isInternetPauseAvailable: isInternetPauseAvailable,
    };
};

module.exports = jamDevicesFileManager;