KrakenJS
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Tim Messerschmidt presented on the KrakenJS framework at the LondonJS conference. KrakenJS is an open source JavaScript stack built on Node.js and Express that is preconfigured with tools like Dust for templating, LESS for CSS preprocessing, and RequireJS for module loading. It also includes modules like Makara for internationalization, Lusca for security, and Adaro and Kappa to integrate Dust templating. Using KrakenJS and Node.js at PayPal resulted in teams being 1/3 to 1/10 the size of Java teams, doubled requests per second, decreased response times by 35%, and increased development speed twofold.
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KrakenJS
- 2. A story of! technical debt
- 3. Application stacks at PayPal C++ Java
- 4. Environments & Lean UX Prototyping Production
- 5. Application stacks at PayPal C++ XSL Java JSP Node JS
- 6. Node & JS at PayPal Moving away from Java architecture • CSS, HTML and even JS in Java • Originally replaced by JSP Rapid development & deployment cycles • • • • Open Source Stack Bootstrap for frontend JavaScript templating via Dust V8 in PayPal’s C++ stack for legacy app UI
- 7. New stack at PayPal Dust C++ Java Node
- 8. Advantages of Node Results of using Node at PayPal • Teams between 1/3 to 1/10 of Java teams • Doubled requests per second • 35% decrease in average response time • Lines of code shrunk by factor 3 to 5 • Development twice as fast • JS both on frontend and backend
- 10. What is Kraken? A JS suite on top of Node.js and Express Preconfigured with different best practices and tools: • • • • • Dust for templates LESS as CSS preprocessor RequireJS as JS file and module loader Grunt for running tasks Runtime updates for UI code
- 11. But why?!
- 12. Project structure Opinionated about separation of logic and presentation • • • • • • /config /controllers /models /public/templates /locales /tests
- 14. … and many more
- 15. Makara Local content bundles Internationalization support for Node apps var i18n = require('makara'); var provider = i18n.create(config); provider.getBundle('index', 'en_US', function (err, bundle) { var string = bundle.get('key'); });
- 16. Property files for Makara index.title=KrakenJS at LondonJS Conf index.speaker=Tim Messerschmidt index.greeting=Ahoi {attendeeName}! # A list index.speakers[0]=Lea Verou index.speakers[1]=Peter-Paul Koch Index.speakers[2]=Hannah Wolfe # A map index.sponsors[PP]=PayPal index.sponsors[GH]=GitHub # And subkeys index.conference.language=JS
- 17. Makara in use Defining multiple values /locales/US/en/index.properties • index.greeting=Hello {name}! /locales/ES/es/index.properties • index.greeting=Hola {name}! Accessing keys in templates <h1>{@pre type="content" key="index.greeting"/}</h1>
- 18. Lusca Security settings against various vulnerabilities Cross-site request forgery support Clickjacking / X-Frame-Options Output escaping against XSS via Dust Content Security Policy
- 19. Lusca configuration Configuration in middleware.json "appsec": { "csrf": true, "csp": false, "p3p": false, "xframe": "SAMEORIGIN” } … or using Lusca’s methods
- 20. Lusca against CSRF A token is added to the session automatically var express = require('express'), appsec = require('lusca'), server = express(); server.use(appsec.csrf()); The template needs to return the token: <input type="hidden" name="_csrf" value="{_csrf}”>
- 21. Adaro Brings Dust as default templating engine Designed to work together with Makara dustjs.onLoad = function (name, context, callback) { // Custom file read/processing pipline callback(err, str); } app.engine('dust', dustjs.dust({ cache: false })); app.set('view engine', 'dust');
- 22. Templating with Dust Layout <html> <body> {>"{_main}"/} </body> </html> Content page as partial <div>Hello!</div> dust.render(’partial', { layout: ’template' }, ...);
- 23. Templating with Dust Sections {#modules} {name}, {description}{~n} {/modules} View context { modules: [ { name: “Makara”, description: “i18n” }, { name: “Lusca”, description: “security settings” } ] }
- 24. Templating with Dust Conditionals {#modules} {name}, {description}{~n} {:else} No modules supported :( {/modules} {?modules} modules exists! {/modules} {^modules} No modules! {/modules}
- 25. Kappa Serves as NPM Proxy Enables support for private npm repos Based on npm-delegate hapi support Global or local installation npm install -g kappa kappa -c config.json
- 26. Configuring Kraken Lives in /config/app.json Development vs. Production environments • 2nd configuration allowed: – app-development.json • Usage of NODE_ENV for environment nconf for credentials and other variables
- 27. The Generator
- 28. Getting started sudo npm install -g generator-kraken yo kraken ,'""`. / _ _ |(@)(@)| Release the Kraken! ) __ ( /,'))((`. (( (( )) )) ` `)(' /'
- 29. Generation yo kraken:controller myController Respond to XHR requests? (Y/n) create controllers/myController.js create test/myController.js
- 30. Result without XHR var myModel = require('../models/model'); module.exports = function (app) { var model = new myModel(); app.get(’/ahoi', function (req, res) { res.render(’ahoi', model); }); };
- 31. Result with XHR app.get('/ahoiXHR', function (req, res) { res.format({ json: function () { res.json(model); }, html: function () { res.render(’ahoiXHR', model); } }); });
- 32. Models yo kraken:model unicorn create models/unicorn.js module.exports = function UnicornModel() { return { name: ‘Charlie’ }; };
- 33. Summary