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logger.js
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#!/usr/bin/env node
/* jshint node: true */
'use strict';
/**
* Utility class, which offers customized logging capabilities.
* To acquire the logger, you need to call the LoggerFactory.createLogger() method.
* @class Logger
*/
var fs = require('fs');
require('colors');
/***Date******/
var getCurrentDate = function() {
return new Date().toJSON().slice(0, 10);
};
var getCurrentTime = function() {
return new Date().toTimeString().slice(0, 8);
};
var getCurrentDateTime = function() {
return getCurrentDate() + ' ' + getCurrentTime();
};
/*********/
var Colorizer = function() {
this.defaultLevels = {
info: 'green',
warning: 'yellow',
error: 'red',
yolo: 'magenta'
};
this.levels = {};
this.getColor = function(level) {
if (this.checkLevel(level)) {
return this.levels[level];
}
};
this.checkLevel = function(level) {
if (this.levels[level]) {
return true;
} else {
throw new Error("No such level: " + level);
}
};
};
var ConsoleLogger = {
writeLog: function(preparedMessage) {
console.log(preparedMessage);
}
};
var ConsoleLoggerAdapter = function(colorizer) {
this.log = function(level, message) {
ConsoleLogger.writeLog(this.prepareMessage(level, message));
};
this.prepareMessage = function(level, message) {
return '[' + getCurrentDateTime().gray + '] ' + level[this.colorizer.getColor(level)] + ': ' + message;
};
this.colorizer = colorizer;
};
var FileLogger = {
writeLog: function(file, preparedMessage) {
fs.appendFile(file, preparedMessage, function(err) {
if (err) {
throw err;
}
});
}
};
var FileLoggerAdapterInterFace = function() {
this.log = function(level, message) {
FileLogger.writeLog(this.file, this.prepareMessage(level, message));
};
this.setFile = function(file) {
if (this.validFileExtensions.exec(file)) {
this.file = file;
} else {
throw new Error("Not valid file extension: " + file);
}
};
};
var FileLoggerAdapter = function(file, colorizer) {
FileLoggerAdapterInterFace.call(this);
this.validFileExtensions = /(\.log|\.txt)$/i;
this.setFile(file);
this.prepareMessage = function(level, message) {
if (this.colorizer.checkLevel(level)) {
return '[' + getCurrentDateTime() + '] ' + level + ': ' + message + '\n';
}
};
this.colorizer = colorizer;
};
var HtmlLoggerAdapter = function(file, colorizer) {
FileLoggerAdapterInterFace.call(this);
this.validFileExtensions = /(\.html)$/i;
this.setFile(file);
this.prepareMessage = function(level, message) {
var newDate,
newLevel,
newMessage;
newDate = '<span>' + '[' + getCurrentDateTime() + '] ' + '</span>';
newLevel = '<span style="color:' + this.colorizer.getColor(level) + ';">' + level + '</span>';
newMessage = '<span>' + ': ' + message + '</span>';
return '<p>' + newDate + newLevel + newMessage + '</p>' + '\n';
};
this.colorizer = colorizer;
};
/**
* Logs the message with a pre-defined level.
* @method log
* @param {String} level Defines the level of the logging message.
* By default, this parameter can either be "info", "warning", "error" or "yolo"
* @param {String} message The message you want to log.
*/
/**
* Factory method that returns a function, which logs a message with a pre-defined level.
* @method logFactory
* @param {String} level Defines the level of the logging message.
* By default, this parameter can either be "info", "warning", "error" or "yolo"
* @param {String} message The message you want to log.
*/
var LoggerWrapper = function() {
var me = this;
me.adapters = [];
me.log = function(level, message) {
me.adapters.forEach(function(adapter) {
adapter.log(level, message);
});
};
me.logFactory = function(level, message) {
return function(onFinished) {
me.log(level, message);
onFinished();
};
};
};
/**
* Returns the initialized config object to be used in builder.js. The config object is a singleton.
* @method LoggerFactory.createLogger
* @static
* @param {Object} configObj Configuration object. If undefined, a simple console logger is returned.
* ConfigObject has two Object properties: levels nad output.
* In levels, the log levels and their colors can be defined. The colors van be the color of npm 'color' module.
* If levels is undefined, the default levels with the default colors will be used.
* In output, the log outputs can be defined, which can be: console, file(.log, .txt file) or html(.html file).
* If output is not defined, the log output will only be the console.
* @return {Logger} The instantiated logger.
* @example
* LoggerFactory
* .createLogger({
* levels: {
* info: 'green',
* warning: 'yellow',
* error: 'red',
* myLevel: 'magenta'
* },
* output: {
* console: '',
* file: 'myLog.log',
* html: 'myHtmlLog.html'
* }
* });
*/
exports.LoggerFactory = {
createLogger: function(configObj) {
var loggerWrapper,
colorizer,
outputs,
prop;
configObj = configObj || {};
loggerWrapper = new LoggerWrapper();
colorizer = new Colorizer();
colorizer.levels = configObj.levels || colorizer.defaultLevels;
if (!configObj.output) {
loggerWrapper.adapters.push(new ConsoleLoggerAdapter(colorizer));
} else {
outputs = configObj.output;
for (prop in outputs) {
if (prop === 'console') {
loggerWrapper.adapters.push(new ConsoleLoggerAdapter(colorizer));
} else if (prop === 'file') {
loggerWrapper.adapters.push(new FileLoggerAdapter(outputs[prop], colorizer));
} else if (prop === 'html') {
loggerWrapper.adapters.push(new HtmlLoggerAdapter(outputs[prop], colorizer));
}
}
}
return loggerWrapper;
}
};