Function buildDownloadCoverTask

packages/core/src/sync/sync-files.ts:1046–1071

(backend: ISyncBackend, info: BookInfo)

}

function buildDownloadCoverTask(backend: ISyncBackend, info: BookInfo): FileTask {
  const bookTitle = info.book.title || "未知书籍";
  return {
    label: `${bookTitle} cover`,
    run: async (onProgress) => {
      const taskStart = Date.now();
      try {
        console.log(`[Sync] 📥 Downloading cover: ${bookTitle} ← ${info.remoteCoverPath}`);
        const bytes = await downloadRemoteFileToPath(
          backend,
          info.remoteCoverPath,
          info.localCoverPath,
          onProgress,
        );
        const size = bytes === null ? "" : ` (${(bytes / 1024).toFixed(2)} KB)`;
        console.log(
          `[Sync] ✓ Downloaded cover "${bookTitle}"${size} in ${Date.now() - taskStart}ms`,
        );
        return true;
      } catch (e) {
        console.log(`[Sync] ✗ Failed to download cover "${bookTitle}": ${e}`);
        return false;
      }
    },
  };
}

async function cleanupRemoteOrphans(
  backend: ISyncBackend,