D-Net

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

import 'reflect-metadata';

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, RenderOptions} from '@nguniversal/express-engine';

// Import module map for lazy loading

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

import {routes} from "./routes";

import * as prom from "prom-client";

import {REQUEST, RESPONSE} from "@nguniversal/express-engine/tokens";

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

/*

// 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 register = new prom.Registry();

const responses = new prom.Counter({

  name: 'portal_http_responses_total',

  help: 'A counter for portal response codes for every existed or not existed pages.',

  labelNames: ['route', 'code'],

  registers: [register]

});

const histogram = new prom.Histogram({

  name: 'portal_http_request_duration_seconds',

  help: 'A Histogram for a portal. Providing information about page visits and load latency in seconds.',

  labelNames: ['route'],

  registers: [register],

  buckets: [0.1, 0.2, 0.5, 1, 2]

});

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

  const opts = {

    document: template,

    url: options.req.url,

    extraProviders: [

      provideModuleMap(LAZY_MODULE_MAP),

      {

        provide: REQUEST,

        useValue: options.req

      },

      {

        provide: RESPONSE,

        useValue: options.req.res,

      },

    ]

  };

  renderModuleFactory(AppServerModuleNgFactory, opts)

    .then(html => callback(null, html)

    );

});

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', register.contentType);

  res.end(register.metrics());

});

// All regular routes use the Universal engine

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

  if (routes.indexOf(req.path) !== -1) {

    const end = histogram.startTimer({route: req.path});

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

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

      responses.inc({route: req.path, code: res.statusCode});

      end();

    });

  } else {

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

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

      responses.inc({route: '**', code: res.statusCode});

    });

  }

});

// Start up the Node server

app.listen(PORT, () => {

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

});