feat(fetcher): use client_credentials grant type to avoid missing refresh token (#62)

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

app/fetcher/beatmapset.py

@@ -10,7 +10,7 @@ from app.models.beatmap import SearchQueryModel
 from app.models.model import Cursor
 from app.utils import bg_tasks
 
-from ._base import BaseFetcher, TokenAuthError
+from ._base import BaseFetcher
 
 from httpx import AsyncClient
 import redis.asyncio as redis
@@ -25,6 +25,9 @@ class RateLimitError(Exception):
 logger = fetcher_logger("BeatmapsetFetcher")
 
 
+MAX_RETRY_ATTEMPTS = 3
+
+
 class BeatmapsetFetcher(BaseFetcher):
     @staticmethod
     def _get_homepage_queries() -> list[tuple[SearchQueryModel, Cursor]]:
@@ -46,14 +49,17 @@ class BeatmapsetFetcher(BaseFetcher):
 
         return homepage_queries
 
-    async def request_api(self, url: str, method: str = "GET", **kwargs) -> dict:
+    async def request_api(self, url: str, method: str = "GET", *, retry_times: int = 0, **kwargs) -> dict:
         """覆盖基类方法，添加速率限制和429错误处理"""
         # 在请求前获取速率限制许可
+        if retry_times > MAX_RETRY_ATTEMPTS:
+            raise RuntimeError(f"Maximum retry attempts ({MAX_RETRY_ATTEMPTS}) reached for API request to {url}")
+
         await osu_api_rate_limiter.acquire()
 
         # 检查 token 是否过期，如果过期则刷新
         if self.is_token_expired():
-            await self.refresh_access_token()
+            await self.grant_access_token()
 
         header = kwargs.pop("headers", {})
         header.update(self.header)
@@ -70,12 +76,10 @@ class BeatmapsetFetcher(BaseFetcher):
             if response.status_code == 429:
                 logger.warning(f"Rate limit exceeded (429) for {url}")
                 raise RateLimitError(f"Rate limit exceeded for {url}. Please try again later.")
-
-            # 处理 401 错误
             if response.status_code == 401:
                 logger.warning(f"Received 401 error for {url}")
-                await self._clear_tokens()
-                raise TokenAuthError(f"Authentication failed. Please re-authorize using: {self.authorize_url}")
+                await self._clear_access_token()
+                return await self.request_api(url, method, retry_times=retry_times + 1, **kwargs)
 
             response.raise_for_status()
             return response.json()