refactor: 优化 RetryHandler 装饰器以支持动态 KeyManager 注入

app/services/chat/retry_handler.py

@@ -12,9 +12,8 @@ logger = get_retry_logger()
 class RetryHandler:
     """重试处理装饰器"""
 
-    def __init__(self, max_retries: int = 3, key_manager: KeyManager = None, key_arg: str = "api_key"):
+    def __init__(self, max_retries: int = 3, key_arg: str = "api_key"):
         self.max_retries = max_retries
-        self.key_manager = key_manager
         self.key_arg = key_arg
 
     def __call__(self, func: Callable[..., T]) -> Callable[..., T]:
@@ -29,9 +28,11 @@ class RetryHandler:
                     last_exception = e
                     logger.warning(f"API call failed with error: {str(e)}. Attempt {attempt + 1} of {self.max_retries}")
 
-                    if self.key_manager:
+                    # 从函数参数中获取 key_manager
+                    key_manager = kwargs.get('key_manager')
+                    if key_manager:
                         old_key = kwargs.get(self.key_arg)
-                        new_key = await self.key_manager.handle_api_failure(old_key)
+                        new_key = await key_manager.handle_api_failure(old_key)
                         kwargs[self.key_arg] = new_key
                         logger.info(f"Switched to new API key: {new_key}")