feat: implement download retry mechanism and prevent duplicate requests

Author: luckfunc

index.js

@@ -23,6 +23,8 @@ const tags = {
   missing: '[MISSING]',
 };
 
+const pendingDownloads = new Set();
+
 const logger = {
   info(message) {
     console.log(`${colors.info}${tags.info} ${message}${colors.reset}`);
@@ -104,14 +106,14 @@ async function downloadFileWithRetries(url, filePath, maxRetries = 3) {
   fs.mkdirSync(path.dirname(filePath), { recursive: true });
   if (fs.existsSync(filePath)) {
     logger.info(`Skip download, file already exists → ${filePath}`);
-    return;
+    return true;
   }
 
   for (let attempt = 1; attempt <= maxRetries; attempt++) {
     try {
       const fileSize = await streamDownload(url, filePath);
       logger.success(`Downloaded ${filePath} (${fileSize} bytes)`);
-      return;
+      return true;
     } catch (error) {
       if (attempt < maxRetries) {
         logger.warn(`Retry ${attempt}/${maxRetries} → ${filePath}`);
@@ -120,6 +122,8 @@ async function downloadFileWithRetries(url, filePath, maxRetries = 3) {
       }
     }
   }
+
+  return false;
 }
 
 userInputReader.question(
@@ -164,8 +168,18 @@ userInputReader.question(
         const localFilePath = path.join(process.cwd(), decodedPath);
         const remoteFileUrl = `${baseUrl}${encodedPath}`;
 
+        if (pendingDownloads.has(localFilePath)) {
+          logger.warn(`Skip duplicate request → ${decodedPath}`);
+          continue;
+        }
+
+        pendingDownloads.add(localFilePath);
         logger.missing(decodedPath, remoteFileUrl, localFilePath);
-        await downloadFileWithRetries(remoteFileUrl, localFilePath);
+        try {
+          await downloadFileWithRetries(remoteFileUrl, localFilePath);
+        } finally {
+          pendingDownloads.delete(localFilePath);
+        }
       }
     });
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "resource-save-script",
-  "version": "1.0.13",
+  "version": "1.0.14",
   "description": "HTTP server with auto-download capability",
   "homepage": "https://github.com/luckfunc/resource-save-script#readme",
   "bugs": {