Dynamically exports functions with node js

I developed a few days ago a script to monitor node js applications. The wrong thing about it is that I have to exports manually each function that I want to monitor. For example, here is a piece of code I want to monitor :

var express = require('express');

var app = express();

app.get('/', function(req, res){
    res.setHeader('Content-Type', 'text/plain');
    res.end('Home');
});

app.get('/login', function(req, res){

    //On doit remplacer les appels de fonctions monitorées
    //par le module.exports.fonction
    //login(req,res);
    exports.instrument_login(req, res)
});

function login(req, res){
   res.setHeader('Content-Type', 'text/plain');
   res.end('Page de login');
}
exports.instrument_login = login;
app.listen(1616);

All I have to do right now is to export the login function. Then my script will associate some AOP to it and I will be able to get the time of execution and the througput.

But, as you can see, I have to use exports.instrument_login(req, res) instead of login(req, res). I would be able to avoid this code replacement by listing directly every function in the app-script and then associate it to an AOP function. But then again, I just cannot figure it out.

Is it possible to do some kind of loop to go through every function in the app-script?

Someting like this :

Object.keys(object).sort(function( a, b ) {
        return a.localeCompare( b );
    }).forEach(function( element, index, array ) {
        console.log(element);
    });

But instead of object I would pass the object in Node JS which wrap every function?