from flask import Flask, render_template

import socketio

# set this to 'threading', 'eventlet', or 'gevent'

async_mode = 'threading'

sio = socketio.Server(async_mode=async_mode)

app = Flask(__name__)

app.wsgi_app = socketio.Middleware(sio, app.wsgi_app)

@app.route('/')

def index():

return render_template('latency.html')

@sio.on('ping')

def ping(sid):

sio.emit('pong', room=sid)

if __name__ == '__main__':

if async_mode == 'threading':

# deploy with Werkzeug

app.run(threaded=True)

elif async_mode == 'eventlet':

# deploy with eventlet

import eventlet

from eventlet import wsgi

wsgi.server(eventlet.listen(('', 5000)), app)

elif async_mode == 'gevent':

# deploy with gevent

from gevent import pywsgi

try:

from geventwebsocket.handler import WebSocketHandler

websocket = True

except ImportError:

websocket = False

if websocket:

pywsgi.WSGIServer(('', 5000), app,

handler_class=WebSocketHandler).serve_forever()

else:

pywsgi.WSGIServer(('', 5000), app).serve_forever()

else:

print('Unknown async_mode: ' + async_mode)