Kraken at DevCon TLV
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This presentation was being held at DevCon TLV 2014. It covers PayPal's recent move to NodeJS and it's Open Source suite called krakenJS.
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Kraken at DevCon TLV
- 1. krakenjs! Tim Messerschmidt @SeraAndroid DevCon Tel Aviv, 2014
- 2. A story of! technical debt
- 3. Our Traditional Application Stacks C++ Java
- 6. Environments & Lean UX Prototyping Production
- 8. Moving away from good old Java
- 9. A big push for using Open Source within the company
- 11. Environments & Lean UX Prototyping Production Node.js Java (Rhino) Dust Dust
- 12. Trying out Node in Production
- 13. New stack at PayPal C++ Java Node Dust
- 16. Using npm at PayPal Enables standard services like • Monitoring • Logging • Security • Analytics • Authentication • Packaging
- 18. What is Kraken? A JS suite on top of 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
- 19. But why?!
- 20. Project structure Opinionated about separation of logic and presentation • /config • /controllers • /models • /public/templates • /locales • /tests
- 22. 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'); });
- 23. Property files for Makara index.title=KrakenJS at DevCon index.speaker=Tim Messerschmidt index.greeting=Ahoi {attendeeName}! # A list index.speakers[0]=Mitchell Hashimoto index.speakers[1]=Arthur Viegers Index.speakers[2]=Johnny Miller # A map index.sponsors[PP]=PayPal index.sponsors[GH]=mongoDB # And subkeys index.conference.language=JS
- 24. 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>
- 25. Lusca Sensible security settings to prevent common vulnerabilities • Cross-site request forgery support • Clickjacking / X-Frame-Options • Output escaping against XSS via Dust • Content Security Policy
- 26. Lusca configuration Configuration in middleware.json "appsec": { "csrf": true, "csp": false, "p3p": false, "xframe": "SAMEORIGIN” } … or using Lusca’s function calls
- 27. 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}”>
- 29. 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');
- 30. Templating with Dust Layout <html> <body> {>"{_main}"/} </body> </html> Content page as partial <div>Hello!</div> dust.render(’partial', { layout: ’template' }, ...);
- 31. Templating with Dust Sections {#modules} {name}, {description}{~n} {/modules} View context { modules: [ { name: “Makara”, description: “i18n” }, { name: “Lusca”, description: “security settings” } ] }
- 32. Templating with Dust Conditionals {#modules} {name}, {description}{~n} {:else} No modules supported :( {/modules} {?modules} modules exists! {/modules} {^modules} No modules! {/modules}
- 33. 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
- 34. 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
- 35. Setting up your app app.configure = function configure(nconf, next) { // Async method run on startup. next(null); }; app.requestStart = function requestStart(server) { // Run before most express middleware has been registered. }; app.requestBeforeRoute = function requestBeforeRoute(server) { // Run before any routes have been added. }; app.requestAfterRoute = function requestAfterRoute(server) { // Run after all routes have been added. };
- 36. The Generator
- 37. Getting started sudo npm install -g generator-kraken yo kraken ,'""`. / _ _ |(@)(@)| Release the Kraken! ) __ ( /,'))((`. (( (( )) )) ` `)(' /'
- 38. Kraken 1.x and the road ahead
- 39. Summary 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