feat(fetcher): optimize the process of getting beatmap raw to boost recalculate

app/fetcher/beatmap_raw.py

@@ -1,9 +1,10 @@
+import asyncio
+
 from app.log import fetcher_logger
 
 from ._base import BaseFetcher
 
-from httpx import AsyncClient, HTTPError
-from httpx._models import Response
+from httpx import AsyncClient, HTTPError, Limits
 import redis.asyncio as redis
 
 urls = [
@@ -16,24 +17,117 @@ logger = fetcher_logger("BeatmapRawFetcher")
 
 
 class BeatmapRawFetcher(BaseFetcher):
-    async def get_beatmap_raw(self, beatmap_id: int) -> str:
-        for url in urls:
-            req_url = url.format(beatmap_id=beatmap_id)
-            logger.opt(colors=True).debug(f"get_beatmap_raw: <y>{req_url}</y>")
-            resp = await self._request(req_url)
-            if resp.status_code >= 400:
-                continue
-            if not resp.text:
-                continue
-            return resp.text
-        raise HTTPError("Failed to fetch beatmap")
+    def __init__(self, client_id: str = "", client_secret: str = "", **kwargs):
+        # BeatmapRawFetcher 不需要 OAuth，传递空值给父类
+        super().__init__(client_id, client_secret, **kwargs)
+        # 使用共享的 HTTP 客户端和连接池
+        self._client: AsyncClient | None = None
+        # 用于并发请求去重
+        self._pending_requests: dict[int, asyncio.Future[str]] = {}
+        self._request_lock = asyncio.Lock()
 
-    async def _request(self, url: str) -> Response:
-        async with AsyncClient(timeout=15) as client:
-            response = await client.get(
-                url,
+    async def _get_client(self) -> AsyncClient:
+        """获取或创建共享的 HTTP 客户端"""
+        if self._client is None:
+            # 配置连接池限制
+            limits = Limits(
+                max_keepalive_connections=20,
+                max_connections=50,
+                keepalive_expiry=30.0,
             )
-            return response
+            self._client = AsyncClient(
+                timeout=10.0,  # 单个请求超时 10 秒
+                limits=limits,
+                follow_redirects=True,
+            )
+        return self._client
+
+    async def close(self):
+        """关闭 HTTP 客户端"""
+        if self._client is not None:
+            await self._client.aclose()
+            self._client = None
+
+    async def get_beatmap_raw(self, beatmap_id: int) -> str:
+        future: asyncio.Future[str] | None = None
+
+        # 检查是否已有正在进行的请求
+        async with self._request_lock:
+            if beatmap_id in self._pending_requests:
+                logger.debug(f"Beatmap {beatmap_id} request already in progress, waiting...")
+                future = self._pending_requests[beatmap_id]
+
+        # 如果有正在进行的请求，等待它
+        if future is not None:
+            try:
+                return await future
+            except Exception as e:
+                logger.warning(f"Waiting for beatmap {beatmap_id} failed: {e}")
+                # 如果等待失败，继续自己发起请求
+                future = None
+
+        # 创建新的请求 Future
+        async with self._request_lock:
+            if beatmap_id in self._pending_requests:
+                # 双重检查，可能在等待锁时已经有其他协程创建了
+                future = self._pending_requests[beatmap_id]
+                if future is not None:
+                    try:
+                        return await future
+                    except Exception as e:
+                        logger.debug(f"Concurrent request for beatmap {beatmap_id} failed: {e}")
+                        # 继续创建新请求
+
+            # 创建新的 Future
+            future = asyncio.get_event_loop().create_future()
+            self._pending_requests[beatmap_id] = future
+
+        try:
+            # 实际执行请求
+            result = await self._fetch_beatmap_raw(beatmap_id)
+            future.set_result(result)
+            return result
+        except Exception as e:
+            future.set_exception(e)
+            raise
+        finally:
+            # 清理
+            async with self._request_lock:
+                self._pending_requests.pop(beatmap_id, None)
+
+    async def _fetch_beatmap_raw(self, beatmap_id: int) -> str:
+        client = await self._get_client()
+        last_error = None
+
+        for url_template in urls:
+            req_url = url_template.format(beatmap_id=beatmap_id)
+            try:
+                logger.opt(colors=True).debug(f"get_beatmap_raw: <y>{req_url}</y>")
+                resp = await client.get(req_url)
+
+                if resp.status_code >= 400:
+                    logger.warning(f"Beatmap {beatmap_id} from {req_url}: HTTP {resp.status_code}")
+                    last_error = HTTPError(f"HTTP {resp.status_code}")
+                    continue
+
+                if not resp.text:
+                    logger.warning(f"Beatmap {beatmap_id} from {req_url}: empty response")
+                    last_error = HTTPError("Empty response")
+                    continue
+
+                logger.debug(f"Successfully fetched beatmap {beatmap_id} from {req_url}")
+                return resp.text
+
+            except Exception as e:
+                logger.warning(f"Error fetching beatmap {beatmap_id} from {req_url}: {e}")
+                last_error = e
+                continue
+
+        # 所有 URL 都失败了
+        error_msg = f"Failed to fetch beatmap {beatmap_id} from all sources"
+        if last_error:
+            raise HTTPError(error_msg) from last_error
+        raise HTTPError(error_msg)
 
     async def get_or_fetch_beatmap_raw(self, redis: redis.Redis, beatmap_id: int) -> str:
         from app.config import settings