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Socket.IO for Haskell Folks
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Real-time Applications
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Regular HTTP
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Polling
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Long-Polling
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EventSource
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WebSocket
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WebSocket
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“TCP for the web”
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PROS Bi-directional + Full-duplex ! Lower overhead ! Port 80
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CONS Not widely supported ! Still a draft*
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Socket.IO
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asdf
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“The cross-browser cross-device WebSocket”
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Browser Support IE 5.5+ Safari 2+ Google Chrome 4+ Firefox 3+ Opera 10.61+
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Transport Support WebSocket Flash Socket AJAX long polling AJAX multipart Forever iframe JSONP Polling
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socket.emit(‘news’, ‘hey!’); ! ! ! Server
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socket.on(‘news’, function (data) { console.log(data); // hey! }); ! Client
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socket.emit(‘news’, ‘hey!’); ! socket.on(‘ping’, function () { socket.emit(‘pong’); }); Server
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socket.on(‘news’, function (data) { console.log(data); // hey! }); ! socket.emit(‘ping’); Client
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Originated from Node.js
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Now also available in many other languages Erlang Java Lua Python Perl Go C++ C Objective-C Haxe Ruby PHP
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Except for Haskell
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socketio-0.1.0
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socket.emit(‘news’, ‘hey!’); ! socket.on(‘ping’, function () { socket.emit(‘pong’); });
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emit “news” [“hey!”] ! on “ping” $ emit “pong” []
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Transport Support WebSocket (80%) Flash Socket AJAX long polling AJAX multipart Forever iframe JSONP Polling
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Difficulties
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Transport Support ಠ~ಠ
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Transport Support WebSocket Flash Socket AJAX long polling AJAX multipart Forever iframe JSONP Polling
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Transport Support WebSocket Flash Socket AJAX long polling AJAX multipart Forever iframe JSONP Polling
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“Premature optimization is the root of all evil”
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Monad Transformers ಠ~ಠ
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! KEEP CALM AND JUST USE IT
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Iteratee I/O ಠ~ಠ
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String/Text/ByteString ಠ~ಠ
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{-# LANGUAGE OverloadedStrings #-}
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Open Source Community ಠ~ಠ
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Originated from Node.js
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Cabal Hell ಠ~ಠ
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> cabal uninstall cabal: unrecognised command: uninstall (try --help)
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cabal-dev?
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LIVE DEMO
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http://banacorn.org:3000
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TODO
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cabal-dev?
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banacorn/socket.io-haskell ! ! ! ALL CONTRIBUTIONS ARE WELCOME!
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THANKS! Questions?