Fix anti-stuck not working when there was zero progress

Knossos.NET/Classes/ThrottledStream.cs

@@ -1,6 +1,7 @@
-using System.Threading;
+using System;
 using System.IO;
-using System;
+using System.Threading;
+using System.Threading.Tasks;
 
 
 namespace Knossos.NET.Classes
@@ -150,5 +151,11 @@ public override long Seek(long offset, SeekOrigin origin)
         {
             return stream.Seek(offset, origin);
         }
+
+        public override ValueTask<int> ReadAsync(Memory<byte> buffer, CancellationToken cancellationToken = default)
+        {
+            Limit(buffer.Length);
+            return stream.ReadAsync(buffer, cancellationToken);
+        }
     }
 }

Knossos.NET/ViewModels/Templates/Tasks/DownloadFile.cs

@@ -238,7 +238,32 @@ private async Task<bool> Download(Uri downloadUrl, string destinationFilePath, F
                         throw new TaskCanceledException();
                     }
 
-                    var bytesRead = await contentStream.ReadAsync(buffer);
+                    int bytesRead = 0;
+                    if (Knossos.globalSettings.antiStuck)
+                    {
+                        //If there is zero progress, cancel (throws exception)
+                        using var readTimeoutCts = new CancellationTokenSource(TimeSpan.FromSeconds(ANTI_STUCK_CHECK_SECONDS));
+                        using var linkedCts = CancellationTokenSource.CreateLinkedTokenSource(cancellationTokenSource!.Token, readTimeoutCts.Token);
+                        try
+                        {
+                            bytesRead = await contentStream.ReadAsync(buffer.AsMemory(), linkedCts.Token);
+                        }
+                        catch (OperationCanceledException)
+                        {
+                            if (readTimeoutCts.IsCancellationRequested)
+                            {
+                                Log.Add(Log.LogSeverity.Warning, "TaskItemViewModel.Download",
+                                $"[ANTI-STUCK] Mirror {CurrentMirror ?? downloadUrl.Host} is stuck. " +
+                                "Changing to a diferent mirror...");
+                            }
+                            return false;
+                        }
+                    }
+                    else
+                    {
+                        bytesRead = await contentStream.ReadAsync(buffer.AsMemory(), cancellationTokenSource!.Token);
+                    }
+
                     if (bytesRead == 0)
                     {
                         isMoreToRead = false;