pythonasyncioeventletgeventlong-pollinglow-latencysocket-iosocketiosocketio-serverweb-serverwebsocket
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138 lines
3.9 KiB
138 lines
3.9 KiB
# set async_mode to 'threading', 'eventlet', 'gevent' or 'gevent_uwsgi' to
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# force a mode else, the best mode is selected automatically from what's
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# installed
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async_mode = None
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# set instrument to `True` to accept connections from the official Socket.IO
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# Admin UI hosted at https://admin.socket.io
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instrument = True
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admin_login = {
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'username': 'admin',
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'password': 'python', # change this to a strong secret for production use!
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}
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from flask import Flask, render_template
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import socketio
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sio = socketio.Server(
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async_mode=async_mode,
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cors_allowed_origins=None if not instrument else [
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'http://localhost:5000',
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'https://admin.socket.io', # edit the allowed origins if necessary
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])
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if instrument:
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sio.instrument(auth=admin_login)
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app = Flask(__name__)
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app.wsgi_app = socketio.WSGIApp(sio, app.wsgi_app)
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app.config['SECRET_KEY'] = 'secret!'
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thread = None
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def background_thread():
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"""Example of how to send server generated events to clients."""
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count = 0
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while True:
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sio.sleep(10)
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count += 1
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sio.emit('my_response', {'data': 'Server generated event'})
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@app.route('/')
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def index():
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global thread
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if thread is None:
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thread = sio.start_background_task(background_thread)
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return render_template('index.html')
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@sio.event
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def my_event(sid, message):
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sio.emit('my_response', {'data': message['data']}, room=sid)
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@sio.event
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def my_broadcast_event(sid, message):
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sio.emit('my_response', {'data': message['data']})
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@sio.event
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def join(sid, message):
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sio.enter_room(sid, message['room'])
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sio.emit('my_response', {'data': 'Entered room: ' + message['room']},
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room=sid)
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@sio.event
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def leave(sid, message):
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sio.leave_room(sid, message['room'])
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sio.emit('my_response', {'data': 'Left room: ' + message['room']},
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room=sid)
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@sio.event
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def close_room(sid, message):
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sio.emit('my_response',
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{'data': 'Room ' + message['room'] + ' is closing.'},
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room=message['room'])
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sio.close_room(message['room'])
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@sio.event
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def my_room_event(sid, message):
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sio.emit('my_response', {'data': message['data']}, room=message['room'])
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@sio.event
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def disconnect_request(sid):
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sio.disconnect(sid)
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@sio.event
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def connect(sid, environ):
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sio.emit('my_response', {'data': 'Connected', 'count': 0}, room=sid)
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@sio.event
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def disconnect(sid, reason):
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print('Client disconnected, reason:', reason)
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if __name__ == '__main__':
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if instrument:
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print('The server is instrumented for remote administration.')
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print(
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'Use the official Socket.IO Admin UI at https://admin.socket.io '
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'with the following connection details:'
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)
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print(' - Server URL: http://localhost:5000')
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print(' - Username:', admin_login['username'])
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print(' - Password:', admin_login['password'])
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print('')
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if sio.async_mode == 'threading':
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# deploy with Werkzeug
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app.run(threaded=True)
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elif sio.async_mode == 'eventlet':
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# deploy with eventlet
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import eventlet
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import eventlet.wsgi
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eventlet.wsgi.server(eventlet.listen(('', 5000)), app)
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elif sio.async_mode == 'gevent':
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# deploy with gevent
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from gevent import pywsgi
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try:
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from geventwebsocket.handler import WebSocketHandler
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websocket = True
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except ImportError:
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websocket = False
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if websocket:
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pywsgi.WSGIServer(('', 5000), app,
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handler_class=WebSocketHandler).serve_forever()
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else:
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pywsgi.WSGIServer(('', 5000), app).serve_forever()
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elif sio.async_mode == 'gevent_uwsgi':
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print('Start the application through the uwsgi server. Example:')
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print('uwsgi --http :5000 --gevent 1000 --http-websockets --master '
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'--wsgi-file app.py --callable app')
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else:
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print('Unknown async_mode: ' + sio.async_mode)
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