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Socket.IO server

Project description

https://travis-ci.org/miguelgrinberg/python-socketio.svg?branch=master

Python implementation of the Socket.IO realtime server.

Features

  • Fully compatible with the Javascript, Swift, C++ and Java official Socket.IO clients, plus any third party clients that comply with the Socket.IO specification.

  • Compatible with Python 2.7 and Python 3.3+.

  • Supports large number of clients even on modest hardware when used with an asynchronous server based on eventlet or gevent. For development and testing, any WSGI complaint multi-threaded server can be used.

  • Includes a WSGI middleware that integrates Socket.IO traffic with standard WSGI applications.

  • Broadcasting of messages to all connected clients, or to subsets of them assigned to “rooms”.

  • Optional support for multiple servers, connected through a messaging queue such as Redis or RabbitMQ.

  • Send messages to clients from external processes, such as Celery workers or auxiliary scripts.

  • Event-based architecture implemented with decorators that hides the details of the protocol.

  • Support for HTTP long-polling and WebSocket transports.

  • Support for XHR2 and XHR browsers.

  • Support for text and binary messages.

  • Support for gzip and deflate HTTP compression.

  • Configurable CORS responses, to avoid cross-origin problems with browsers.

Example

The following application uses Flask to serve the HTML/Javascript to the client:

import socketio
import eventlet
from flask import Flask, render_template

sio = socketio.Server()
app = Flask(__name__)

@app.route('/')
def index():
    """Serve the client-side application."""
    return render_template('index.html')

@sio.on('connect', namespace='/chat')
def connect(sid, environ):
    print("connect ", sid)

@sio.on('chat message', namespace='/chat')
def message(sid, data):
    print("message ", data)
    sio.emit('reply', room=sid)

@sio.on('disconnect', namespace='/chat')
def disconnect(sid):
    print('disconnect ', sid)

if __name__ == '__main__':
    # wrap Flask application with engineio's middleware
    app = socketio.Middleware(sio, app)

    # deploy as an eventlet WSGI server
    eventlet.wsgi.server(eventlet.listen(('', 8000)), app)

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