Web temps-réel (ou quasi) avec PythonLa cantine (Paris) - 2011-11-28

Monday, November 28, 11

• Web craftsman

• Writing opensource for a living

• benoitc@apache.org

• @benoitc

Benoît Chesneau

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Apache CouchDBhttp://couchdb.apache.org

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http://gunicorn.org

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http://refuge.io

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Web temps-réel (ou quasi) avec Python

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?Monday, November 28, 11

• Il ne s’agit pas de de recevoir des news plus rapidement

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Pousser les données

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client server

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client server

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• comet

• long-polling

• connexion continue

• websockets

• event source

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No!

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Client

serveur HTTP

Application Python

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• pas incompatible avec WSGI

• peut aussi fonctionner dans votre framework (django, flask, pyramid, ...)

• Streamer & Itérer

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• Paralléliser

• Librairies Asynchrones

• Frameworks

stdlib

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• twisted

• Gevent & Eventlet

• Tornado

• Gunicorn

librairies asynchrones

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Gevent & socket.io

<script src="/socket.io/socket.io.js""></script> <script> var socket = io.connect( 'http://localhost'); socket.on('news', function(data) { console.log(data); socket.emit('my other event’, { my: 'data' }); }); </script>

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Gevent & socket.io

def hello_world(environ, start_response): if not environ['PATH_INFO'].startswith('/socket.io'): return serve_file(environ, start_response) socketio = environ[ 'socketio'] while True: socketio.send('Hello, world') gevent .sleep(2)

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Tornado + Websockets

var ws = new WebSocket("ws://friendfeed.com/websocket");ws.onopen = function() { ws.send("This is a message from the browser to the server");};ws.onmessage = function(event) { alert("The server sent a message: " + event.data);};

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Tornado + Websockets

class EchoWebSocket(tornado.websocket.WebSocketHandler): def open(self): self.receive_message(self.on_message)

def on_message(self, message): self.write_message(u"You said: " + message)

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• stackless

• greenlets

• py.py --withmod-_stackless

http://www.grant-olson.net/python/intro-to-stackless-python

stacklessMonday, November 28, 11

• hookbox : http://hookbox.org

• moksha https://fedorahosted.org/moksha/

autres frameworksMonday, November 28, 11

gunicorn

• gère les websockets

• gevent & eventlet

• ‘gunicorn.socket’

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merci! questions?

@benoitcMonday, November 28, 11