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node.js server of many uses Mike Brevoort Colorado Springs Open Source Users Group 23 February 2012 1

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Mike Brevoort @mbrevoort work at... (though opinions expressed in this presentation are my own and not meant to represent Pearson) 2

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agenda very brief intro to node.js a tour of some “unconventional” uses of node.js * though I don’t particularly like the work conventional 3

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node.js An Evented I/O network server for Javascript created by Ryan Dahl sponsored by 4

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“Most languages were designed to solve computational problems, but Node.js is different. Node.js was designed from the ground up to efficiently handle the communication that is at the heart of modern web applications.” http://www.joyentcloud.com/products/smart-appliances/ node-js-smartmachine/ 5

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generating load 6

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“Mozilla uses a single node thread to simulate 180K users! I have commercial testing gear that can't do that! #nodesummit” Chris Johnson @mast3rof0 - 1/24/2012 7

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https://gist.github.com/1861747 8

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interprocess RPC 10

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DNode symmetric remote function calling between processes to/from the browser via socket.io JSON protocol dnode ports in ruby, java, php, perl https://github.com/substack/dnode async rpc through sockets/JSON 11

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server client 12

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headless testing 13

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zombie.js fast headless simulated browser testing emulation 14

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zombie.js fast headless simulated browser testing Cookies and Web Storage XMLHttpRequest in all its glory setTimeout/ setInterval pushState, popstate and hashchange events alert, confirm and prompt HTML5 parsing and dealing with tag soups DOM Level 3 implementation HTML5 form fields (search, url, etc) CSS3 Selectors with some extensions 15

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headless WebKit with JavaScript API Fast and native NOT node.js But node is commonly used as an orchestrator 16

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phantomjs-node “...implements a nauseously clever bridge between Phantom and Node” 17

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screenshotting 18

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curl http://localhost:3000/cnn.com > cnn.png https://github.com/visionmedia/screenshot-app screenshot-app web screenshotting 19

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webcrawling 20

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browser APIs or fallbacks 23

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node-canvas https://github.com/LearnBoost/node-canvas HTML5 server-side canvas API fallback run canvas API calls in node, send an image back to the client great for some mobile use cases legacy browser fallback 24

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Deployments 25

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https://github.com/substack/propagit multi-server git deployment over http Propagit Hub drone drone drone drone git push http://hubhost:6001/ somerepo master repos/somerepo.git repos/somerepo.git repos/somerepo.git repos/somerepo.git 26

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Propagit https://github.com/substack/propagit multi-server git deployment over http Hub drone drone drone drone propagit deploy --hub=hubhost:6000 --secret=beepboop \ somerepo ed56c6e85731d412fe22cf437cb63130afc34b07 deploy/ somerepo.ed56c... deploy/ somerepo.ed56c... deploy/ somerepo.ed56c... deploy/ somerepo.ed56c... 27

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Propagit https://github.com/substack/propagit multi-server git deployment over http Hub drone drone drone drone propagit spawn --hub=hubhost:6000 --secret=beepboop \ somerepo ed56c6e85731d412fe22cf437cb63130afc34b07 \ -- node server.js 8085 deploy/ somerepo.ed56c... deploy/ somerepo.ed56c... deploy/ somerepo.ed56c... deploy/ somerepo.ed56c... 28

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load balancing 29

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Bouncy programmatic http load balancer and router https://github.com/substack/bouncy 30

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Bouncy programmatic http load balancer and router https://github.com/substack/bouncy 31

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network tracing 32

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node_pcap decode, print and analyze packets node makes it very nice since each packet is emitted as a Buffer by the EventEmitter libpcap bindings https://github.com/mranney/node_pcap 33

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shell scripting 34

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shell scripting fs core library - abstract OS or shell implementation details can leverage the node module ecosystem great if you need to do I/O beyond filesystem npm client 35

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fs.watch(filename, [options], listener) 36

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https://github.com/polotek/procstreams pipe-able and composable shell scripting in node Procstreams 37

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Browser fallbacks Deployment Load balancing Network tracing Shell scripting Load generation IPC Testing Screenshotting Webcrawling tip of the iceberg 38

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@mbrevoort Mike Brevoort Thanks! Questions? 39