pythonasyncioeventletgeventlong-pollinglow-latencysocket-iosocketiosocketio-serverweb-serverwebsocket
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58 lines
1.6 KiB
58 lines
1.6 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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from flask import Flask, render_template
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import socketio
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sio = socketio.Server(async_mode=async_mode)
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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.route("/")
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def index():
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return render_template("latency.html")
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@sio.event
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def ping_from_client(sid):
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sio.emit("pong_from_server", room=sid)
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if __name__ == "__main__":
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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(
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("", 5000), app, handler_class=WebSocketHandler
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).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(
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"uwsgi --http :5000 --gevent 1000 --http-websockets --master "
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"--wsgi-file latency.py --callable app"
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)
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else:
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print("Unknown async_mode: " + sio.async_mode)
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