loggerUtil.js

'use strict';

var util = require('util'),
    winston = require('winston'),
    logger = new winston.Logger(),
    production = (process.env.NODE_ENV || '').toLowerCase() === 'production';

module.exports = {
    middleware: function(req, res, next){
        console.info(req.method, req.url, res.statusCode);
        next();
    },
    production: production
};

// Override the built-in console methods with winston hooks
switch((process.env.NODE_ENV || '').toLowerCase()){
    case 'production':
        production = true;
        logger.add(winston.transports.File, {
            filename: __dirname + '/application.log',
            handleExceptions: true,
            exitOnError: false,
            level: 'warn'
        });
        break;
    case 'test':
        // Don't set up the logger overrides
        return;
    default:
        logger.add(winston.transports.Console, {
            colorize: true,
            timestamp: true,
            level: 'info'
        });
        break;
}

function formatArgs(args){
    return [util.format.apply(util.format, Array.prototype.slice.call(args))];
}

console.log = function(){
    logger.info.apply(logger, formatArgs(arguments));
};
console.info = function(){
    logger.info.apply(logger, formatArgs(arguments));
};
console.warn = function(){
    logger.warn.apply(logger, formatArgs(arguments));
};
console.error = function(){
    logger.error.apply(logger, formatArgs(arguments));
};
console.debug = function(){
    logger.debug.apply(logger, formatArgs(arguments));
};