async def serve_development_app(
app: Application,
host: str,
port: int,
started: asyncio.Event | None = None,
) -> None:
enable_pretty_logging()
# setup up tornado to use asyncio
AsyncIOMainLoop().install()
server = HTTPServer(app)
server.listen(port, host)
if started:
# at this point the server is accepting connection
started.set()
try:
# block forever - tornado has already set up its own background tasks
await asyncio.get_event_loop().create_future()
finally:
# stop accepting new connections
server.stop()
# wait for existing connections to complete
await server.close_all_connections()
