Wrap express js middlewares

wrap_express_middlewares.js

//Referred link https://www.lunchbadger.com/tracking-the-performance-of-express-js-routes-and-middleware/
var express = require('express')
var uuid = require('uuid')

const bodyParser = require('body-parser');
const {
    EventEmitter
} = require('events');
const profiles = new EventEmitter();

var app = express()


function wrap(fn) {
    return function Wrapped(req, res, next) {
        const start = Date.now();
        fn(req, res, function () {
            profiles.emit('middleware', {
                req,
                name: fn.name,
                elapsedMS: Date.now() - start
            });

            next.apply(this, arguments);
        });
    };
}

profiles.on('route', ({
    req,
    elapsedMS
}) => {
    console.log(req.method, req.url, `${elapsedMS}ms`);
});

profiles.on('middleware', ({
    req,
    name,
    elapsedMS
}) => {
    console.log(req.id, ' Middleware:', name?name:'Ananymous', `${elapsedMS}ms`);
});


//Wrapped original app.use function here
var originalAppUseFn = app.use;
app.use = function () {

    lastArg = arguments.length - 1;

    if (typeof arguments[lastArg] === 'function') {
        arguments[lastArg] = wrap(arguments[lastArg])
    }

    originalAppUseFn.apply(this, arguments)
}

app.use(function (req, res, next) {
    if (req.url === '/favicon.ico') {
        res.send('not available');
        return;
    }
    next();
})

app.use(function assignId(req, res, next) {
    const uuidv4 = require('uuid/v4');
    req.id = uuidv4();
    next();
})


// Make sure you register this **before** other middleware
app.use(function profilerMiddleware(req, res, next) {
    const start = Date.now();
    // The 'finish' event will emit once the response is done sending
    res.once('finish', () => {
        // Emit an object that contains the original request and the elapsed time in MS
        profiles.emit('route', {
            req,
            elapsedMS: Date.now() - start
        });
    });

    next();
});

app.use(bodyParser.json());

app.use(express.static(__dirname + '/public'));

app.use(function block(req, res, next) {
    setTimeout(() => next(), 3000);
});

//Filter by args
app.use('/test', function filterSpecifRoutes(req, res, next) {
    console.log("specific routes.........", )
    next();
})

var r1 = express.Router();
r1.get('*', function (req, res, next) {
    next();
});



var r2 = express.Router();
r2.get('*', function R2Router(req, res, next) {
    next();
});

app.use(r1);
app.use(r2);


app.get("/test", function (req, res) {
    res.send("helloworld");
})

app.all('*', function (req, res, next) {
    next('unknown url')
})


app.use(function clientErrorHandler(err, req, res, next) {
    res.status(500).send({
        error: 'Something failed!'
    })
})

app.listen(3000, function (err) {
    console.log('app is listening 3000 port', err)
})