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WebSockets (sflive2012)
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Igor Wiedler
June 08, 2012
Programming
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2.6k
WebSockets (sflive2012)
Igor Wiedler
June 08, 2012
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Transcript
WEBSOCKETS
• Symfony2 • Silex • Composer igorw @igorwesome
WEBSOCKETS
WEB
Application HTTP Presentation TCP Session TCP Transport TCP Network IP
Data Link Physical
Application HTTP Presentation TCP Session TCP Transport TCP Network IP
Data Link Physical
client
request client
reponse client request
THIS IS A GOOD THING
BUT
NOT FOR EVERYTHING
UNIDIRECTIONAL
None
LATENCY
LATENCY KEEP-ALIVE PIPELINING SPDY
STATELESS
Application HTTP Presentation TCP Session TCP Transport TCP Network IP
Data Link Physical
Application HTTP Presentation TCP Session TCP Transport TCP Network IP
Data Link Physical
WEBSOCKETS
SOCKETS
WEBSOCKETS
PROTOCOL API
THE WEBSOCKET PROTOCOL
browser
None
• Handshake / Upgrade • TCP + framing • Proxies
• Supports TLS (SSL)
RFC 6455
THE WEBSOCKET API
browser
var ws = new WebSocket('ws://example.org:8080/updates'); ws.onopen = function () {
ws.send('hello'); }; ws.onmessage = function (event) { console.log(event.data); };
USE CASES •Games •Notifications •Collaboration •Statistics •Chat
4.0+ (2009) 6.0+ (2011) 10.70+ (2012) 5.0+ (2010) 10+ (2012)
• transport abstraction (fallbacks) • broadcasting, reconnection, serialization, other stuff
• monolithic! (and almost trying to fix it)
SOCKJS
var ws = new WebSocket(url);
var ws = new SockJS(url);
ASYNC STACK Connect Express SockJS
ASYNC STACK ? ? SockJS
ASYNC STACK EventMachine ? ? SockJS
ASYNC STACK ? ? SockJS
Y U NO PHP?
SYNC STACK Application
ASYNC Connect Express SockJS SYNC Application
None
None
*MQ
*MQ Sync Async
DEMO
DEBUGGING •printf •chrome inspector •wssh •ngrep •zmqc
RECAP • Use SockJS • Polyglot is the future •
Learn from the MQs
LINKS • tools.ietf.org/html/rfc6455 • dev.w3.org/html5/websockets • sockjs.org
github.com/igorw/websockets-talk
CREDITS • thenounproject.com • stopwatch
None
None
nodephp.org github.com/cboden/Ratchet
Questions? @igorwesome speakerdeck.com /u/igorw joind.in/6586