somewhat reusable socket logger

socketlogger.js

//somewhat reusable module socketlogger - it requires the usage of global.socket
//so it's not passed to every log function.
function SocketLogger() {}

var getLogger = function(categoryName) {
    SocketLogger.prototype = log4js.getLogger(categoryName);

    ['Trace','Debug','Info','Warn','Error','Fatal', 'Mark'].forEach(
        function (levelString) {
            var level = log4js.levels.toLevel(levelString);
            SocketLogger.prototype[levelString.toLowerCase()] = function() {
                var args = Array.prototype.slice.call(arguments);
                if (global.socket)
                    args.unshift(global.socket.id + ' - ');
                args.unshift(level);
                SocketLogger.prototype.log.apply(this, args);
            }
        }
    );

    return new SocketLogger();
};

module.exports = {
    getLogger: getLogger
};