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 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.
Example
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 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)
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