explore-services/explore/server.ts

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import 'zone.js/dist/zone-node';
import { ngExpressEngine } from '@nguniversal/express-engine';
import * as express from 'express';
import * as compression from 'compression';
import { join } from 'path';
import { AppServerModule } from './src/main.server';
import { APP_BASE_HREF } from '@angular/common';
import { existsSync } from 'fs';
import * as prom from "prom-client";
import {routes} from "./routes";
import {REQUEST, RESPONSE} from "./src/app/openaireLibrary/utils/tokens";
// The Express app is exported so that it can be used by serverless Functions.
export function app() {
const server = express();
server.use(compression());
const distFolder = join(process.cwd(), 'dist/explore/browser');
const indexHtml = existsSync(join(distFolder, 'index.original.html')) ? 'index.original.html' : 'index';
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]
});
// Our Universal express-engine (found @ https://github.com/angular/universal/tree/master/modules/express-engine)
server.engine('html', ngExpressEngine({
bootstrap: AppServerModule,
}));
server.set('view engine', 'html');
server.set('views', distFolder);
// Example Express Rest API endpoints
// server.get('/api/**', (req, res) => { });
// Serve static files from /browser
server.get('*.*', express.static(distFolder, {
maxAge: '1y'
}));
server.get('/metrics', (req, res) => {
res.set('Content-Type', register.contentType);
res.end(register.metrics());
});
// All regular routes use the Universal engine
server.get('*', (req, res) => {
if (routes.indexOf(req.path) !== -1) {
const end = histogram.startTimer({route: req.path});
res.render(indexHtml, {
req, providers: [
{
provide: APP_BASE_HREF,
useValue: req.baseUrl
},
{
provide: REQUEST, useValue: (req)
},
{
provide: RESPONSE, useValue: (res)
}
]
}
);
res.on('finish', function () {
responses.inc({route: req.path, code: res.statusCode});
end();
});
} else {
res.render(indexHtml, {
req, providers: [
{
provide: APP_BASE_HREF,
useValue: req.baseUrl
},
{
provide: REQUEST, useValue: (req)
},
{
provide: RESPONSE, useValue: (res)
}
]
}
);
res.on('finish', function () {
responses.inc({route: '**', code: res.statusCode});
});
}
});
return server;
}
function run() {
const port = process.env.PORT || 4000;
// Start up the Node server
const server = app();
server.listen(port, () => {
console.log(`Node Express server listening on http://localhost:${port}`);
});
}
// Webpack will replace 'require' with '__webpack_require__'
// '__non_webpack_require__' is a proxy to Node 'require'
// The below code is to ensure that the server is run only when not requiring the bundle.
declare const __non_webpack_require__: NodeRequire;
const mainModule = __non_webpack_require__.main;
const moduleFilename = mainModule && mainModule.filename || '';
if (moduleFilename === __filename || moduleFilename.includes('iisnode')) {
run();
}
export * from './src/main.server';