import json
from typing import TypeVar

from redis.asyncio import Redis

r = Redis(host="localhost", port=6379, db=5)

_T = TypeVar("_T", str, int, float, bool, dict)


async def upset_setting(key: str, value: _T | None = None) -> _T | None:
    if value is not None:
        val = json.dumps(value)
        await r.set(key, val)
        return value
    val = await r.get(key)
    if val:
        return json.loads(val)
    return None