fix: close redis only if its used

cashu/mint/cache.py

@@ -6,15 +6,14 @@
 from loguru import logger
 from pydantic import BaseModel
 from redis.asyncio import from_url
-from redis.asyncio.client import Redis as RedisType
 from redis.exceptions import ConnectionError
 
 from ..core.errors import CashuError
 from ..core.settings import settings
 
 
 class RedisCache:
-    redis: RedisType
+    initialized = False
     expiry = settings.mint_redis_cache_ttl
 
     def __init__(self):
@@ -29,6 +28,7 @@ async def test_connection(self):
         try:
             await self.redis.ping()
             logger.success("Connected to Redis caching server.")
+            self.initialized = True
         except ConnectionError as e:
             logger.error("Redis connection error.")
             raise e
@@ -66,5 +66,5 @@ async def wrapper(request: Request, payload: BaseModel):
         return passthrough if not settings.mint_redis_cache_enabled else decorator
 
     async def disconnect(self):
-        if self.redis:
+        if self.initialized:
             await self.redis.close()