fix(trpc): bound scrape concurrency and surface DB errors

packages/trpc/src/services/library.service.ts

@@ -5,6 +5,10 @@ import { createWebdav, isVideoFilename, joinWebdavPath, listDirectory } from "./
 import { scrapeService } from "./scrape.service.js";
 
 const MAX_SCAN_FILES = 2000;
+/** 同时执行的 upsert+刮削 job 上限，避免最坏 2000 并发打 Bangumi 被限流 */
+const SCRAPE_CONCURRENCY = 4;
+
+type ScanJob = () => Promise<void>;
 
 async function walkVideos(
     userId: string,
@@ -12,7 +16,7 @@ async function walkVideos(
     root: string,
     rel: string,
     budget: { left: number },
-    out: Promise<void>[],
+    out: ScanJob[],
 ): Promise<void> {
     if (budget.left <= 0) return;
     const mount = await mountDao.getByIdForUser(mountId, userId);
@@ -38,8 +42,8 @@ async function walkVideos(
         if (!isVideoFilename(entry.basename)) continue;
         budget.left -= 1;
         const title = entry.basename.replace(/\.[a-z0-9]+$/i, "");
-        out.push(
-            (async () => {
+        // 延迟执行：扫描阶段只收集 job，随后分批限流
+        out.push(async () => {
             const item = await mediaItemDao.upsertFromScan({
                 userId,
                 mountId,
@@ -49,8 +53,7 @@ async function walkVideos(
                 size: entry.size,
             });
             await scrapeService.autoScrape(userId, item.id);
-            })(),
-        );
+        });
     }
 }
 
@@ -78,9 +81,12 @@ export const libraryService = {
         if (!mount) throw new TRPCError({ code: "NOT_FOUND", message: "挂载不存在" });
         if (!mount.enabled) throw new TRPCError({ code: "BAD_REQUEST", message: "挂载已禁用" });
         const budget = { left: MAX_SCAN_FILES };
-        const jobs: Promise<void>[] = [];
+        const jobs: ScanJob[] = [];
         await walkVideos(userId, mountId, mount.rootPath || "/", "/", budget, jobs);
-        await Promise.allSettled(jobs);
+        for (let i = 0; i < jobs.length; i += SCRAPE_CONCURRENCY) {
+            const batch = jobs.slice(i, i + SCRAPE_CONCURRENCY).map((job) => job());
+            await Promise.allSettled(batch);
+        }
         return { scanned: MAX_SCAN_FILES - budget.left, message: "扫描完成" };
     },
 };

packages/trpc/src/services/scrape.service.ts

@@ -104,8 +104,17 @@ export const scrapeService = {
             });
             return;
         }
+        // 只包网络搜索：DB 写失败必须向外抛，避免被误标 failed 后吞掉
+        let hits: BangumiSearchHit[];
         try {
-            const hits = await bangumiSearch(q);
+            hits = await bangumiSearch(q);
+        } catch {
+            await mediaItemDao.updateScrape(mediaItemId, userId, {
+                scrapeStatus: "failed",
+                scrapedAt: new Date(),
+            });
+            return;
+        }
         const hit = hits[0];
         if (!hit) {
             await mediaItemDao.updateScrape(mediaItemId, userId, {
@@ -122,11 +131,5 @@ export const scrapeService = {
             title: hit.nameCn || hit.name,
             epNumber: parseEpisodeFromFilename(row.rawName),
         });
-        } catch {
-            await mediaItemDao.updateScrape(mediaItemId, userId, {
-                scrapeStatus: "failed",
-                scrapedAt: new Date(),
-            });
-        }
     },
 };