彻底删除数据库记录验证码

backend/app/utils/redis_client.py

@@ -1,27 +1,21 @@
+from functools import lru_cache
 import logging
 import os
 from typing import Optional, TYPE_CHECKING
-
-if TYPE_CHECKING:
-    from redis import Redis
+import redis
 
 logger = logging.getLogger(__name__)
 
-try:
-    import redis  # type: ignore
-except ImportError:  # pragma: no cover
-    redis = None  # type: ignore
-
 
 REDIS_URL = os.getenv("REDIS_URL", "").strip()
 REDIS_CONNECT_TIMEOUT_SECONDS = float(os.getenv("REDIS_CONNECT_TIMEOUT_SECONDS", "2"))
 REDIS_SOCKET_TIMEOUT_SECONDS = float(os.getenv("REDIS_SOCKET_TIMEOUT_SECONDS", "2"))
 
-_redis_client: Optional["Redis"] = None
+_redis_client: Optional["redis.Redis"] = None
 _initialized = False
 
-
-def get_redis_client() -> Optional["Redis"]:
+@lru_cache
+def get_redis_client() -> Optional["redis.Redis"]:
     """Return a singleton Redis client, or None when Redis is unavailable."""
     global _redis_client, _initialized
 
@@ -31,12 +25,7 @@ def get_redis_client() -> Optional["Redis"]:
     _initialized = True
 
     if not REDIS_URL:
-        logger.info("REDIS_URL 未配置，验证码将回退到数据库存储")
-        _redis_client = None
-        return _redis_client
-
-    if redis is None:
-        logger.warning("未安装 redis 包，验证码将回退到数据库存储")
+        logger.info("REDIS_URL 未配置，验证码将回退到内存存储")
         _redis_client = None
         return _redis_client