//
// Copyright (c) Microsoft and contributors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//
// See the License for the specific language governing permissions and
// limitations under the License.
//
/**
* Creates a new Logger object
* @class
* The Logger class is used to write log information.
*
* @constructor
*
* @param {string} [level] The log level. Refer to Logger.LogLevels.
* @param {object} [loggerFunction] The function to write log information.
*/
function Logger(level, loggerFunction) {
/**
* The log level. Refer to the Logger.LogLevels for available log levels.
* @name Logger#level
* @type {string}
* @see Logger.LogLevels
*/
this.level = level;
this.loggerFunction = loggerFunction;
if (!this.loggerFunction) {
this.loggerFunction = this.defaultLoggerFunction;
}
}
/**
* The available log levels.
*
* @const
* @enum {string}
*/
Logger.LogLevels = {
/**
* System is unusable.
*/
EMERGENCY: 'emergency',
/**
* Action must be taken immediately.
*/
ALERT : 'alert',
/**
* Critical condition.
*/
CRITICAL : 'critical',
/**
* Error condition.
*/
ERROR : 'error',
/**
* Warning condition.
*/
WARNING : 'warning',
/**
* Normal but significant condition.
*/
NOTICE : 'notice',
/**
* Purely informational message.
*/
INFO : 'info',
/**
* Application debug messages.
*/
DEBUG : 'debug'
};
Logger.logPriority = [
Logger.LogLevels.EMERGENCY,
Logger.LogLevels.ALERT,
Logger.LogLevels.CRITICAL,
Logger.LogLevels.ERROR,
Logger.LogLevels.WARNING,
Logger.LogLevels.NOTICE,
Logger.LogLevels.INFO,
Logger.LogLevels.DEBUG
];
Logger.prototype.log = function (level, msg) {
this.loggerFunction(level, msg);
};
Logger.prototype.emergency = function(msg) {
this.log(Logger.LogLevels.EMERGENCY, msg);
};
Logger.prototype.critical = function(msg) {
this.log(Logger.LogLevels.CRITICAL, msg);
};
Logger.prototype.alert = function(msg) {
this.log(Logger.LogLevels.ALERT, msg);
};
Logger.prototype.error = function(msg) {
this.log(Logger.LogLevels.ERROR, msg);
};
Logger.prototype.warn = function(msg) {
this.log(Logger.LogLevels.WARNING, msg);
};
Logger.prototype.notice = function(msg) {
this.log(Logger.LogLevels.NOTICE, msg);
};
Logger.prototype.info = function(msg) {
this.log(Logger.LogLevels.INFO, msg);
};
Logger.prototype.debug = function(msg) {
this.log(Logger.LogLevels.DEBUG, msg);
};
Logger.prototype.defaultLoggerFunction = function(logLevel , msg) {
var currentLevelIndex = Logger.logPriority.indexOf(this.level);
var logLevelIndex = Logger.logPriority.indexOf(logLevel);
var time = new Date();
var timeStamp = time.toISOString();
if (logLevelIndex <= currentLevelIndex) {
console.log('[' + timeStamp + ']' + this.level + ' : ' + msg);
}
};
module.exports = Logger;