D-Net

import 'zone.js/dist/zone-node';

import 'reflect-metadata';

import { renderModuleFactory } from '@angular/platform-server';

import { enableProdMode } from '@angular/core';

import * as express from 'express';

import { join } from 'path';

import { readFileSync } from 'fs';

// Faster server renders w/ Prod mode (dev mode never needed)

enableProdMode();

// Express server

const app = express();

const PORT = process.env.PORT || 4000;

const DIST_FOLDER = join(process.cwd(), 'dist');

// Our index.html we'll use as our template

const template = readFileSync(join(DIST_FOLDER, 'browser', 'index.html')).toString();

// * NOTE :: leave this as require() since this file is built Dynamically from webpack

const { AppServerModuleNgFactory, LAZY_MODULE_MAP } = require('./dist/server/main');

// Express Engine

import { ngExpressEngine } from '@nguniversal/express-engine';

// Import module map for lazy loading

import { provideModuleMap } from '@nguniversal/module-map-ngfactory-loader';

import {Prometheus} from "./prometheus";

import {Counter} from "prom-client";

/*

// Our Universal express-engine (found @ https://github.com/angular/universal/tree/master/modules/express-engine)

app.engine('html', ngExpressEngine({

  bootstrap: AppServerModuleNgFactory,

  providers: [

    provideModuleMap(LAZY_MODULE_MAP)

  ]

}));

*/

// be able to get request and get domain from there

const prometheus: Prometheus = new Prometheus();

app.engine('html', (_, options, callback) => {

    let engine = ngExpressEngine({

        bootstrap: AppServerModuleNgFactory,

        providers: [

            { provide: 'request', useFactory: () => options.req, deps: [] },

            provideModuleMap(LAZY_MODULE_MAP)

        ]

    });

    engine(_, options, callback);

});

app.set('view engine', 'html');

app.set('views', join(DIST_FOLDER, 'browser'));

/* - Example Express Rest API endpoints -

  app.get('/api/**', (req, res) => { });

*/

// Server static files from /browser

app.get('*.*', express.static(join(DIST_FOLDER, 'browser'), {

  maxAge: '1y'

}));

app.get('/metrics', (req, res) => {

  res.set('Content-Type', prometheus.register.contentType);

  res.end(prometheus.register.metrics());

});

// All regular routes use the Universal engine

app.get('*', (req, res) => {

  let start = new Date();

  let counter: Counter = prometheus.counters.get(req.path);

  if(counter !== undefined) {

    counter.inc(1, new Date());

    res.render('index', { req });

    // event triggers when express is done sending response

    res.on('finish', function() {

      console.log(new Date().getTime() - start.getTime());

    });

  } else {

    res.render('index', { req });

  }

});

// Start up the Node server

app.listen(PORT, () => {

  console.log(`Node Express server listening on http://localhost:${PORT}`);

});