How to use the daphne.cli function in daphne

def serve_daphne(self, host, port, **kwargs):
        util.ensure_pip("daphne")
        import daphne.server
        import daphne.cli
        self.server_version = daphne.__version__
        app_asgi = build_asgi_i(self)
        app_daphne = daphne.cli.ASGI3Middleware(app_asgi)
        self._server = daphne.server.Server(
            app_daphne,
            endpoints = ["tcp:port=%d:interface=%s" % (port, host)]
        )
        self._server.run()