from contextlib import asynccontextmanager
from typing import AsyncGenerator

import uvicorn
from fastapi import FastAPI


@asynccontextmanager
async def lifespan(app: FastAPI) -> AsyncGenerator[None, None]:
    yield


def app_factory() -> FastAPI:
    app = FastAPI(lifespan=lifespan)
    return app


def main() -> None:
    uvicorn.run(app_factory, factory=True, host="0.0.0.0", port=8000)


if __name__ == "__main__":
    main()