fix: WebSocket flow control — bufferedAmount + threshold

site/static/app.js

@@ -209,31 +209,43 @@ function uploadFileWS(url, f, idx) {
     ws.binaryType = 'arraybuffer';
 
     ws.onopen = function () {
+      ws.bufferedAmountLowThreshold = CHUNK;
       var reader = new FileReader();
+
+      function sendNext() {
+        var end = Math.min(offset + CHUNK, f.size);
+        reader.readAsArrayBuffer(f.file.slice(offset, end));
+      }
+
       reader.onload = function (e) {
         ws.send(e.target.result);
         offset += CHUNK;
-        if (offset < f.size) {
+
         var pct = Math.round(offset / f.size * 100);
-          if (pct - lastProgress >= 10) {
+        if (pct - lastProgress >= 5) {
           lastProgress = pct;
           f.progress = pct;
           renderTable();
         }
-          readNext();
+
-        } else {
+        if (offset >= f.size) {
-          // Последний чанк + сигнал DONE
+          // Когда буфер опустеет — шлём DONE
-          ws.send(e.target.result);
+          function checkDone() {
+            if (ws.bufferedAmount === 0) {
               ws.send('DONE');
-          f.progress = 100;
+            } else {
-          renderTable();
+              setTimeout(checkDone, 50);
+            }
+          }
+          checkDone();
         }
       };
-      function readNext() {
+
-        var end = Math.min(offset + CHUNK, f.size);
+      ws.addEventListener('bufferedamountlow', function () {
-        reader.readAsArrayBuffer(f.file.slice(offset, end));
+        if (offset < f.size) sendNext();
-      }
+      });
-      readNext();
+
+      sendNext();
     };
 
     ws.onmessage = function (e) {