init

Dockerfile

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+FROM python:3.10-slim
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+EXPOSE 8000
+
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]

docker-compose.yml

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+version: '3.8'
+
+services:
+  app:
+    build: .
+    container_name: fastapi_app
+    ports:
+      - "8000:8000"
+    depends_on:
+      - redis
+    environment:
+      - REDIS_URL=redis://redis:6379
+
+  redis:
+    image: redis:alpine
+    container_name: redis
+    ports:
+      - "6379:6379"

main.py

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+from fastapi import FastAPI, HTTPException, Depends
+from pydantic import BaseModel
+from aioredis import Redis
+from aioredis.client import Redis as RedisClient
+import aioredis
+
+app = FastAPI()
+
+REDIS_URL = "redis://localhost:6379"
+REDIS_KEY = "stored_string"
+
+async def get_redis() -> RedisClient:
+    return await aioredis.from_url(REDIS_URL, encoding="utf-8", decode_responses=True)
+
+class StringRequest(BaseModel):
+    text: str
+
+@app.post("/string", status_code=201)
+async def create_string(request: StringRequest, redis: Redis = Depends(get_redis)):
+    if await redis.exists(REDIS_KEY):
+        raise HTTPException(status_code=400, detail="String already exists. Use PATCH to update.")
+    await redis.set(REDIS_KEY, request.text)
+    return {"message": "String created successfully", "text": request.text}
+
+@app.patch("/string")
+async def update_string(request: StringRequest, redis: Redis = Depends(get_redis)):
+    if not await redis.exists(REDIS_KEY):
+        raise HTTPException(status_code=404, detail="No string found to update. Use POST to create one.")
+    await redis.set(REDIS_KEY, request.text)
+    return {"message": "String updated successfully", "text": request.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 {"text": stored_string}

requirements.txt

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+fastapi
+aioredis[standard]
+uvicorn