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import threading

import time

from socketserver import ThreadingMixIn

from wsgiref.simple_server import make_server, WSGIServer, WSGIRequestHandler

import requests

import socketio

class SocketIOWebServer:

"""A simple web server used for running Socket.IO servers in tests.

:param sio: a Socket.IO server instance.

Note 1: This class is not production-ready and is intended for testing.

Note 2: This class only supports the "threading" async_mode, with WebSocket

support provided by the simple-websocket package.

"""

def __init__(self, sio):

if sio.async_mode != 'threading':

raise ValueError('The async_mode must be "threading"')

def http_app(environ, start_response):

start_response('200 OK', [('Content-Type', 'text/plain')])

return [b'OK']

self.sio = sio

self.app = socketio.WSGIApp(sio, http_app)

self.httpd = None

self.thread = None

def start(self, port=8900):

"""Start the web server.

:param port: the port to listen on. Defaults to 8900.

The server is started in a background thread.

"""

class ThreadingWSGIServer(ThreadingMixIn, WSGIServer):

pass

class WebSocketRequestHandler(WSGIRequestHandler):

def get_environ(self):

env = super().get_environ()

# pass the raw socket to the WSGI app so that it can be used

# by WebSocket connections (hack copied from gunicorn)

env['gunicorn.socket'] = self.connection

return env

self.httpd = make_server('', port, self._app_wrapper,

ThreadingWSGIServer, WebSocketRequestHandler)

self.thread = threading.Thread(target=self.httpd.serve_forever)

self.thread.start()

# wait for the server to start

while True:

try:

r = requests.get(f'http://localhost:{port}/')

r.raise_for_status()

if r.text == 'OK':

break

except:

time.sleep(0.1)

def stop(self):

"""Stop the web server."""

self.sio.shutdown()

self.httpd.shutdown()

self.httpd.server_close()

self.thread.join()

self.httpd = None

self.thread = None

def _app_wrapper(self, environ, start_response):

try:

return self.app(environ, start_response)

except StopIteration:

# end the WebSocket request without sending a response

# (this is a hack that was copied from gunicorn's threaded worker)

start_response('200 OK', [])

return []