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Intro to Node

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Node.JS is a popular server-side JavaScript framework for handling real-time and distributed data processing. In this session you'll learn what Node.JS is, how it works under the hood, and what …

Node.JS is a popular server-side JavaScript framework for handling real-time and distributed data processing. In this session you'll learn what Node.JS is, how it works under the hood, and what scenarios it's useful for. You'll also learn how to deploy it to Windows Azure and manage it inside of IIS 7.

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  • Designed for Data-Intensive & Real-Time Web Applications
  • Server-Side (!!) JavaScript
    Built on top of the Chrome V8 Engine
    Designed for data-intensive & real-time web applications
    Everything is asynchronous
  • Scenarios:
    Large request volume, low response size
    Multiplayer games
    Social / real-time applications
    Pub/Sub
    Uses a language universal to all web developers
    Allows developers with no prior back-end experience to leverage their skills for real applications
  • Callbacks and the Programming Model
    Closures
    Functions as Objects
    Design Patterns
  • HTML5-based IDE
    Free to use
    $12/mo for private projects
    Deploys to Windows Azure
    Hides ~90% of the configuration stuff
  • Transcript

    • 1. Intro to Node.JS By Aaron Stannard Startup Developer Evangelist, Microsoft Corporation
    • 2. Examples from Today’s Talk https://github.com/Aaronontheweb/introtonode
    • 3. Meet Node var http = require('http'); //Node function called each time a new HTTP request arrives function onRequest(req, res){ res.writeHead(200, {'Content-Type':'text/plain'}); res.end('Hello ' + req.connection.remoteAddress + '!'); /* Write the IP addresses of our connecting client to console */ console.log('Incoming connection from ' + req.connection.remoteAddress); } //Listen for connections on the port provided by the host process var server = http.createServer(onRequest).listen(process.env.PORT);
    • 4. What Is Node? • Server Side JavaScript • Asynchronous Web Framework • Evented I/O Model
    • 5. What Is Node? Network I/O Libraries + + =
    • 6. What Makes Node Special? • Uses the familiar JavaScript programming model to enable server-side development • Buries the pain of working with async / parallel programming • No Blocking I/O • Can handle large concurrent loads more easily than other technologies • Not a silver bullet
    • 7. Why Node JavaScript is ubiquitous
    • 8. Why Node Traditional Platforms • Things you need for concurrent web programming: – Locks – Threads / Thread Pools – Thread Management – Inter-Thread Communication – Callbacks + Enclosures + Sync to Blocking Calls Node • Things you need for concurrent web programming: – Callbacks + Enclosures Which looks simpler?
    • 9. Good Node Scenarios Behavior • High request volume, low response-sizes • Pub / Sub • Real-time applications Application • Online games, message passing services • Social networks, content- syndication services • Chat, real-time games
    • 10. Bad Node Scenarios Behavior • Large HTTP response sizes • CRUD • Transaction-heavy systems Application • Static file servers, reporting tools • Blogs, CMS • E-Commerce
    • 11. Node Concepts • What Do Node Projects Look Like? • Event Loop & Workers • HTTP as a First Class Citizen • Callbacks and Functions as Objects • Modules & Packages
    • 12. Structure of a Node Project /projectroot/ package.json readme.txt web/ server.js views/ index.html models/ post.js helpers/ timestamp.js test/ route-test.js post-test.js node_modules/ C:[projectroot]> node web/server.js Node server listenening on port 3000 in development mode Tells Node and NPM what packages are required The main entry point for your application User-defined module for handling persistence User-defined module for other stuff Root of your actual application Directory for unit tests Output directory for all NPM installations
    • 13. Event Loop + Workers
    • 14. HTTP • HTTP is a first class citizen • Request Object – Holds properties about the client – Holds session state – Passes client-data to request handlers • Response Object – Holds the HTTP response stream – Can be written in chunks
    • 15. Callbacks and Functions as Objects // HTTP GET /app/list exports.listapps = function(req, res){ var pageTitle = req.session.userName + "'s Apps"; appProvider.getAppsForUser(req.session.userName, function(error, userApps){ if(error){ console.log(error.message); return res.redirect('/'); } res.render('list_apps', {locals:{title: pageTitle, apps:userApps}}) }); }
    • 16. Modules & Packages • Including a built-in module var http = require('http'); • Including your own module [timestamp.js] exports.currentTime = function(){…} [server.js] var timestamp = require(‘./helpers/timestamp'); [server.js] console.log(timestamp.currentTime()); • Node Package Manager (NPM) [Commandline] C:> npm install express [server.js] var express = require(‘express’);
    • 17. Microsoft & Node Microsoft wants Windows Azure to be an option for developers regardless of stack =>
    • 18. Node on Windows Azure • IISNode • Windows Azure Node PowerShell Cmdlets • Windows Azure Node SDK • Cloud9 IDE
    • 19. IISNode • Hosts Node applications in IIS as native modules • Automatically manages life-cycle of node.exe • Can load-balance multiple node.exe processes
    • 20. Azure / Node Powershell Cmdlets • Create new Azure Services • Add Node Web and Worker Roles • Deploy to Azure Emulator • Import Publish Settings • Deploy to Azure (Production / Staging) • Source @ Github
    • 21. Windows Azure SDK • Loads Storage Settings from Web.config • Azure Tables • Azure Blobs • Azure Queues [console] C:> npm install azure Source @ Github
    • 22. Cloud9 IDE • Browser-based IDE • Deploys to Windows Azure • Only way to deploy without Windows Vista / 7
    • 23. Popular Node Frameworks and Tools • Express (MVC) • Connect • Socket.IO • Unit Testing: – Assert (built-in) – Nodeunit
    • 24. Further Reference • NodeBeginner.org - Used this to teach myself Node when I was first getting started. • NodeJS.org - Official Node Homepage • Github.com/WindowsAzure – Azure bits
    • 25. About Me • Aaron Stannard – Twitter: @Aaronontheweb – Github: @Aaronontheweb – Blog: http://www.aaronstannard.com/

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