Problems with loggers module definition in ExpressJS

Question

I have my nodejs project, and I want to separate loggers from my route.js to have a clean code.

But I have the next problem, when I try to load my logger to the route.js file, it shows me the next error:

TypeError: loggers.getTicketLogger is not a function
    at Object.<anonymous> (/home/ismael/projects/nodejs-ticketing/routes/ticket.js:3:23)
    at Module._compile (module.js:413:34)
    at Object.Module._extensions..js (module.js:422:10)
    at Module.load (module.js:357:32)
    at Function.Module._load (module.js:314:12)
    at Module.require (module.js:367:17)
    at require (internal/module.js:16:19)
    at Object.<anonymous> (/home/ismael/projects/nodejs-ticketing/server.js:49:1)
    at Module._compile (module.js:413:34)
    at Object.Module._extensions..js (module.js:422:10)
    at Module.load (module.js:357:32)
    at Function.Module._load (module.js:314:12)
    at Function.Module.runMain (module.js:447:10)
    at startup (node.js:141:18)
    at node.js:933:3

I have the next code inside my loggers dir:

loggers/ticket.js

var log4js = require('log4js');

module.exports = function(){

  getTicketLogger = function(){
    var logger = null;

    log4js.loadAppender('file');
    log4js.addAppender(log4js.appenders.file(__dirname + '/../log/ticket.log'), 'ticket-log');

    logger = log4js.getLogger('ticket-log');
    logger.setLevel('DEBUG');

    return logger;
  }

};

And my route.js file, has the next head

routes/ticket.js

var Ticket  = require('../models/ticket'),
    loggers = require('../loggers/ticket.js'),
    log     = loggers.getTicketLogger();

module.exports = function(app){
}

What I'm doing wrong, and how can improve the code to separate logger from route.js file.

Thanks you.

Answer 1

loggers/ticket.js should return an object that has your getTicketLogger method.

var log4js = require('log4js');

module.exports = function() {

  var getTicketLogger = function(){
    var logger = null;

    log4js.loadAppender('file');
    log4js.addAppender(log4js.appenders.file(__dirname + '/../log/ticket.log'), 'ticket-log');

    logger = log4js.getLogger('ticket-log');
    logger.setLevel('DEBUG');

    return logger;

  }

  return { getTicketLogger: getTicketLogger };

};

Then in routes/ticket.js

var loggers = require('./../loggers/ticket.js')();
var log = loggers.getTicketLogger;

typeof loggers; // => object
typeof log; // => function