How to use the daphne.ws_protocol.WebSocketFactory function in daphne

def run(self):
        # A dict of protocol: {"application_instance":, "connected":, "disconnected":} dicts
        self.connections = {}
        # Make the factory
        self.http_factory = HTTPFactory(self)
        self.ws_factory = WebSocketFactory(self, server=self.server_name)
        self.ws_factory.setProtocolOptions(
            autoPingTimeout=self.ping_timeout,
            allowNullOrigin=True,
            openHandshakeTimeout=self.websocket_handshake_timeout,
        )
        if self.verbosity <= 1:
            # Redirect the Twisted log to nowhere
            globalLogBeginner.beginLoggingTo(
                [lambda _: None], redirectStandardIO=False, discardBuffer=True
            )
        else:
            globalLogBeginner.beginLoggingTo([STDLibLogObserver(__name__)])

        # Detect what Twisted features are enabled
        if http.H2_ENABLED:
            logger.info("HTTP/2 support enabled")

def buildProtocol(self, addr):
        """
        Builds protocol instances. We use this to inject the factory object into the protocol.
        """
        try:
            protocol = super(WebSocketFactory, self).buildProtocol(addr)
            protocol.factory = self
            return protocol
        except Exception:
            logger.error("Cannot build protocol: %s" % traceback.format_exc())
            raise