from fastapi import FastAPI, HTTPException, Depends
from aioredis import Redis
from aioredis.client import Redis as RedisClient
import aioredis

app = FastAPI()

REDIS_URL = "redis://redis:6379"
REDIS_KEY = "stored_string"

async def get_redis() -> RedisClient:
    return await aioredis.from_url(REDIS_URL, encoding="utf-8", decode_responses=True)

@app.post("/string", status_code=201)
async def create_string(text: str, redis: Redis = Depends(get_redis)):
    await redis.set(REDIS_KEY, text)
    return text

@app.get("/string")
async def get_string(redis: Redis = Depends(get_redis)):
    stored_string = await redis.get(REDIS_KEY)
    if stored_string is None:
        raise HTTPException(status_code=404, detail="No string found.")
    return stored_string