Engine.IO server
Project description
Python implementation of the Engine.IO realtime server.
Features
Fully compatible with the Javascript engine.io-client library, versions 1.5.0 and up.
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 asyncio (sanic, aiohttp or tornado), eventlet or gevent. For development and testing, any WSGI compliant multi-threaded server can be used.
Includes a WSGI middleware that integrates Engine.IO traffic with standard WSGI applications.
Uses an event-based architecture implemented with decorators that hides the details of the protocol.
Implements HTTP long-polling and WebSocket transports.
Supports XHR2 and XHR browsers as clients.
Supports text and binary messages.
Supports gzip and deflate HTTP compression.
Configurable CORS responses to avoid cross-origin problems with browsers.
Examples
The following application uses the Eventlet asynchronous server, and includes a small Flask application that serves the HTML/Javascript to the client:
import engineio
import eventlet
import eventlet.wsgi
from flask import Flask, render_template
eio = engineio.Server()
app = Flask(__name__)
@app.route('/')
def index():
"""Serve the client-side application."""
return render_template('index.html')
@eio.on('connect')
def connect(sid, environ):
print("connect ", sid)
@eio.on('message')
def message(sid, data):
print("message ", data)
eio.send(sid, 'reply')
@eio.on('disconnect')
def disconnect(sid):
print('disconnect ', sid)
if __name__ == '__main__':
# wrap Flask application with engineio's middleware
app = engineio.Middleware(eio, app)
# deploy as an eventlet WSGI server
eventlet.wsgi.server(eventlet.listen(('', 8000)), app)And below is a similar example, coded for asyncio (Python 3.5+ only) with the aiohttp framework:
from aiohttp import web
import engineio
eio = engineio.AsyncServer()
app = web.Application()
eio.attach(app)
async def index(request):
"""Serve the client-side application."""
with open('index.html') as f:
return web.Response(text=f.read(), content_type='text/html')
@eio.on('connect')
def connect(sid, environ):
print("connect ", sid)
@eio.on('message')
async def message(sid, data):
print("message ", data)
await eio.send(sid, 'reply')
@eio.on('disconnect')
def disconnect(sid):
print('disconnect ', sid)
app.router.add_static('/static', 'static')
app.router.add_get('/', index)
if __name__ == '__main__':
web.run_app(app)Resources
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