fix: auto-fix code issues (cron)

- 修复重复导入/字段
- 修复异常处理
- 修复PEP8格式问题
- 添加类型注解
- 修复缺失的urllib.parse导入

backend/rate_limiter.py

@@ -12,6 +12,7 @@ from collections.abc import Callable
 from dataclasses import dataclass
 from functools import wraps
 
+
 @dataclass
 class RateLimitConfig:
     """限流配置"""
@@ -20,6 +21,7 @@ class RateLimitConfig:
     burst_size: int = 10  # 突发请求数
     window_size: int = 60  # 窗口大小（秒）
 
+
 @dataclass
 class RateLimitInfo:
     """限流信息"""
@@ -29,6 +31,7 @@ class RateLimitInfo:
     reset_time: int  # 重置时间戳
     retry_after: int  # 需要等待的秒数
 
+
 class SlidingWindowCounter:
     """滑动窗口计数器"""
 
@@ -60,6 +63,7 @@ class SlidingWindowCounter:
         for k in old_keys:
             self.requests.pop(k, None)
 
+
 class RateLimiter:
     """API 限流器"""
 
@@ -106,13 +110,18 @@ class RateLimiter:
         # 检查是否超过限制
         if current_count >= stored_config.requests_per_minute:
             return RateLimitInfo(
-                allowed=False, remaining=0, reset_time=reset_time, retry_after=stored_config.window_size
+                allowed=False,
+                remaining=0,
+                reset_time=reset_time,
+                retry_after=stored_config.window_size,
             )
 
         # 允许请求，增加计数
         await counter.add_request()
 
-        return RateLimitInfo(allowed=True, remaining=remaining - 1, reset_time=reset_time, retry_after=0)
+        return RateLimitInfo(
+            allowed=True, remaining=remaining - 1, reset_time=reset_time, retry_after=0
+        )
 
     async def get_limit_info(self, key: str) -> RateLimitInfo:
         """获取限流信息（不增加计数）"""
@@ -136,7 +145,9 @@ class RateLimiter:
             allowed=current_count < config.requests_per_minute,
             remaining=remaining,
             reset_time=reset_time,
-            retry_after=max(0, config.window_size) if current_count >= config.requests_per_minute else 0,
+            retry_after=max(0, config.window_size)
+            if current_count >= config.requests_per_minute
+            else 0,
         )
 
     def reset(self, key: str | None = None) -> None:
@@ -148,9 +159,11 @@ class RateLimiter:
             self.counters.clear()
             self.configs.clear()
 
+
 # 全局限流器实例
 _rate_limiter: RateLimiter | None = None
 
+
 def get_rate_limiter() -> RateLimiter:
     """获取限流器实例"""
     global _rate_limiter
@@ -158,6 +171,7 @@ def get_rate_limiter() -> RateLimiter:
         _rate_limiter = RateLimiter()
     return _rate_limiter
 
+
 # 限流装饰器（用于函数级别限流）
 def rate_limit(requests_per_minute: int = 60, key_func: Callable | None = None) -> None:
     """
@@ -178,7 +192,9 @@ def rate_limit(requests_per_minute: int = 60, key_func: Callable | None = None)
             info = await limiter.is_allowed(key, config)
 
             if not info.allowed:
-                raise RateLimitExceeded(f"Rate limit exceeded. Try again in {info.retry_after} seconds.")
+                raise RateLimitExceeded(
+                    f"Rate limit exceeded. Try again in {info.retry_after} seconds."
+                )
 
             return await func(*args, **kwargs)
 
@@ -189,7 +205,9 @@ def rate_limit(requests_per_minute: int = 60, key_func: Callable | None = None)
             info = asyncio.run(limiter.is_allowed(key, config))
 
             if not info.allowed:
-                raise RateLimitExceeded(f"Rate limit exceeded. Try again in {info.retry_after} seconds.")
+                raise RateLimitExceeded(
+                    f"Rate limit exceeded. Try again in {info.retry_after} seconds."
+                )
 
             return func(*args, **kwargs)
 
@@ -197,5 +215,6 @@ def rate_limit(requests_per_minute: int = 60, key_func: Callable | None = None)
 
     return decorator
 
+
 class RateLimitExceeded(Exception):
     """限流异常"""