Commit fb4f28dd authored by Pedro Eduardo Trujillo's avatar Pedro Eduardo Trujillo
Browse files

Incluye Prerender para servir contenido a bots 

Para los bots que requieren contenido "resuelto" (sin necesidad de
ejecutar Javascript) a modo de HTML estático, se incluye esta
funcionalidad mediante la librería prerender-node.

Comprueba si el usuario es un bot, y si no lo es o hubo algún problema,
responde con la versión normal de la aplicación.

Requiere de un servidor Prerender accesible para generar el contenido
(servicio aparte), referenciado mediante $PRERENDER_URL.
parent 13b88294

app/index.js

+8 −5
Original line number Diff line number Diff line 
var packageJson = require('../package.json'),

let packageJson = require('../package.json'),

	version = packageJson.version,



	params = require('./params')(version),



	logging = require('./logging'),

	logger = logging.logger,



	cluster;



if (params.cluster) {
@@ -12,9 +13,9 @@ if (params.cluster) { 
}



if (cluster && cluster.isMaster) {

	var numCpus = require('os').cpus().length;

	let numCpus = require('os').cpus().length;



	for (var i = 0; i < numCpus; i++) {

	for (let i = 0; i < numCpus; i++) {

		cluster.fork();

	}
@@ -23,20 +24,22 @@ if (cluster && cluster.isMaster) { 
		logger.error('worker %i died (%s)', worker.process.pid, signal);

	});

} else {

	var express = require('express'),

	let express = require('express'),

		http = require('http'),



		metrics = require('./metrics')(logger, '/metrics'),

		prerender = require('./prerender')(logger),

		exposure = require('./exposure')(logger, params, version),



		port = params.port,

		debug = params.debug,

		pid = process.pid;



	var app = express();

	let app = express();



	logging.registerAppLogger(params, app);

	metrics.registerAppMetrics(app);

	prerender.registerAppPrerender(app);

	exposure.exposeApp(app);



	http.createServer(app).listen(port, function() {

app/params.js

+4 −4
Original line number Diff line number Diff line 
var commander = require('commander');

let commander = require('commander');



module.exports = function(version) {
@@ -12,13 +12,13 @@ module.exports = function(version) { 
		.showSuggestionAfterError()

		.parse(process.argv);



	var commanderOpts = commander.opts();

	let commanderOpts = commander.opts();



	return {

		useBuilt: commanderOpts.useBuilt,

		cluster: commanderOpts.cluster,

		debug: commanderOpts.debug,

		port: commanderOpts.port,

		lang: commanderOpts.defaultLang

		lang: commanderOpts.defaultLang,

		port: commanderOpts.port

	};

};

app/prerender.js

0 → 100644
+36 −0
Original line number Diff line number Diff line 
let prerenderNode = require('prerender-node'),

	logger;



let prerenderUrl = process.env.PRERENDER_URL;



prerenderNode.set('prerenderServiceUrl', prerenderUrl)

	.set('afterRender', afterRender);



function afterRender(err, req, _prerender_res) {



	if (err || !prerenderUrl) {

		let agent = req.get('User-Agent');



		if (!prerenderUrl) {

			logger.warn('"PRERENDER_URL" is undefined, serving non-static content to bot "%s"', agent);

		} else {

			logger.warn('Prerender error found, serving non-static content to bot "%s". %O', agent, err);

		}



		return { cancelRender: true };

	}

}



function registerPrerender(app) {



	app.use(prerenderNode);

}



module.exports = function(loggerParameter) {



	logger = loggerParameter;



	return {

		registerAppPrerender: registerPrerender

	};

};

package.json

+1 −0
Original line number Diff line number Diff line
@@ -34,6 +34,7 @@ 
    "morgan": "1.10.0",

    "prom-client": "14.0.1",

    "pug": "3.0.2",

    "prerender-node": "3.6.0",

    "response-time": "2.3.2",

    "winston": "3.7.2"

  },

yarn.lock

+5 −0
Original line number Diff line number Diff line
@@ -3293,6 +3293,11 @@ platform@~1.3.6: 
  resolved "https://registry.yarnpkg.com/platform/-/platform-1.3.6.tgz#48b4ce983164b209c2d45a107adb31f473a6e7a7"

  integrity sha512-fnWVljUchTro6RiCFvCXBbNhJc2NijN7oIQxbwsyL0buWJPG85v81ehlHI9fXrJsMNgTofEoWIQeClKpgxFLrg==



prerender-node@3.6.0:

  version "3.6.0"

  resolved "https://registry.yarnpkg.com/prerender-node/-/prerender-node-3.6.0.tgz#5c8a0a19cc26f45a749b3b00598466f21c16d287"

  integrity sha512-jwxTq6Zat0w8+rIo6w1axkpfZZUid2zxVjCpZtgtRtuPf+3/VrXwKb2iM+kdwv6iSAXwwuEtnet9epR1NN/obA==



pretty-bytes@^5.3.0:

  version "5.6.0"

  resolved "https://registry.yarnpkg.com/pretty-bytes/-/pretty-bytes-5.6.0.tgz#356256f643804773c82f64723fe78c92c62beaeb"