dl/lib/logger/index.js

DreamLab Libs

var core = require('core');
var fs = require('fs');

var YAML = core.yaml.YAML;

var Logger = require('./Logger.js').Logger;

var DEFAULT = 'Logger.DEFAULT';
var EMPTY = 'Logger.EMPTY';

var loggers = {};

var getLogger = exports.get = function (name) {
    name = name || Logger.DEFAULT;

    if (!loggers.hasOwnProperty(name)) {
        loggers[name] = new Logger(name);
        loggers[name].setParent(loggers[DEFAULT]);
    }

    return loggers[name];
};

process.on('SIGUSR2', function () {
    var defaultLogger = getLogger(DEFAULT);

    defaultLogger.configure({
        debug: !defaultLogger.debug
    });
});

exports.Logger = getLogger(DEFAULT);
exports.EmptyLogger  = getLogger(EMPTY).configure({
    reporters: {}
});

if (process.env['PAAS_MONITORING_KEY']) {
    var appYaml;

    try {
        if (fs.existsSync('./app.yaml')) {
            appYaml = YAML.parseFileSync('./app.yaml').pop();
        }
    } catch (e) {
        appYaml = null;
    }

    if (appYaml) {
        getLogger(DEFAULT).configure({
            metricPrefix: ['Applications', appYaml.servicename, appYaml.appname].join('.'),
            reporters: {
                MAAS: {
                    key: process.env['PAAS_MONITORING_KEY']
                }
            }
        });
    }
}