from typing import Union

from fastapi import Cookie, Depends, FastAPI

app = FastAPI()


def query_extractor(q: Union[str, None] = None):
 return q


def query_or_cookie_extractor(
 q: str = Depends(query_extractor),
 last_query: Union[str, None] = Cookie(default=None),
):
 if not q:
 return last_query
 return q


@app.get("/items/")
async def read_query(query_or_default: str = Depends(query_or_cookie_extractor)):
 return {"q_or_cookie": query_or_default}