From 99e71134598ddecd0a89b01979151985af832878 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E2=80=9CNaeel=E2=80=9D?= <tazet@narod.ru>
Date: Fri, 10 Jul 2026 23:18:23 +0400
Subject: [PATCH] fix: retry 3x per chunk, 300ms delay

---
 site/static/app.js | 48 +++++++++++++++++++++++++++-------------------
 1 file changed, 28 insertions(+), 20 deletions(-)

diff --git a/site/static/app.js b/site/static/app.js
index 08235e4..b99d95a 100644
--- a/site/static/app.js
+++ b/site/static/app.js
@@ -214,28 +214,36 @@ async function uploadAll() {
   fileSummary.textContent = summary;
 }
 
-/** uploadChunk(blob) — отправить чанк как raw тело */
+/** uploadChunk(blob) — отправить чанк с ретраем до 3 раз */
 function uploadChunk(blob) {
+  var MAX = 3;
+  var attempt = 0;
+
   return new Promise(function (resolve, reject) {
-    var xhr = new XMLHttpRequest();
-    xhr.open('POST', '/upload');
-    xhr.timeout = 10000;
-    xhr.setRequestHeader('Content-Type', 'application/octet-stream');
-    xhr.onload = function () {
-      try {
-        var r = JSON.parse(xhr.responseText);
-        if (r.ok) {
-          resolve({ bytes: r.bytes, elapsed_ms: r.elapsed_ms });
-        } else {
-          reject(new Error(r.error || 'Ошибка сервера'));
-        }
-      } catch (e) {
-        reject(new Error('Bad JSON'));
-      }
-    };
-    xhr.onerror = function () { reject(new Error('Сеть')); };
-    xhr.ontimeout = function () { reject(new Error('Таймаут')); };
-    xhr.send(blob);
+    function trySend() {
+      attempt++;
+      var xhr = new XMLHttpRequest();
+      xhr.open('POST', '/upload');
+      xhr.timeout = 5000;
+      xhr.setRequestHeader('Content-Type', 'application/octet-stream');
+      xhr.onload = function () {
+        try {
+          var r = JSON.parse(xhr.responseText);
+          if (r.ok) { resolve({ bytes: r.bytes, elapsed_ms: r.elapsed_ms }); }
+          else { reject(new Error(r.error || 'Ошибка сервера')); }
+        } catch (e) { reject(new Error('Bad JSON')); }
+      };
+      xhr.onerror = function () {
+        if (attempt < MAX) { setTimeout(trySend, 300); }
+        else { reject(new Error('Сеть')); }
+      };
+      xhr.ontimeout = function () {
+        if (attempt < MAX) { setTimeout(trySend, 300); }
+        else { reject(new Error('Таймаут')); }
+      };
+      xhr.send(blob);
+    }
+    trySend();
   });
 }