chore(sync): remove redundant Task.Run (#9662)

Co-authored-by: Lukasz Rozmej <[email protected]>

Author: phrwlk

src/Nethermind/Nethermind.Synchronization/Blocks/MultiBlockDownloader.cs

@@ -16,23 +16,32 @@ public class MultiBlockDownloader : ISyncDownloader<BlocksRequest>
 {
     public async Task Dispatch(PeerInfo peerInfo, BlocksRequest request, CancellationToken cancellationToken)
     {
-        request.DownloadTask = Task.Run(async () =>
+        cancellationToken.ThrowIfCancellationRequested();
+        if (request.BodiesRequests.Count == 0 && request.ReceiptsRequests.Count == 0)
         {
-            if (request.BodiesRequests.Count > 0)
-            {
-                using IOwnedReadOnlyList<Hash256> bodiesHash = request.BodiesRequests.Select(b => b.Hash)
-                    .ToPooledList(request.BodiesRequests.Count);
-                request.OwnedBodies = await peerInfo.SyncPeer.GetBlockBodies(bodiesHash, cancellationToken);
-            }
+            request.DownloadTask = Task.CompletedTask;
+            return;
+        }
 
-            if (request.ReceiptsRequests.Count > 0)
-            {
-                using IOwnedReadOnlyList<Hash256> receiptsHash = request.ReceiptsRequests.Select(b => b.Hash)
-                    .ToPooledList(request.ReceiptsRequests.Count);
-                var ownedReceipts = await peerInfo.SyncPeer.GetReceipts(receiptsHash, cancellationToken);
-                request.Receipts = ownedReceipts;
-            }
-        }, cancellationToken);
+        request.DownloadTask = DownloadAsync(peerInfo, request, cancellationToken);
         await request.DownloadTask;
     }
+
+    private static async Task DownloadAsync(PeerInfo peerInfo, BlocksRequest request, CancellationToken cancellationToken)
+    {
+        if (request.BodiesRequests.Count > 0)
+        {
+            using IOwnedReadOnlyList<Hash256> bodiesHash = request.BodiesRequests.Select(b => b.Hash)
+                .ToPooledList(request.BodiesRequests.Count);
+            request.OwnedBodies = await peerInfo.SyncPeer.GetBlockBodies(bodiesHash, cancellationToken);
+        }
+
+        if (request.ReceiptsRequests.Count > 0)
+        {
+            using IOwnedReadOnlyList<Hash256> receiptsHash = request.ReceiptsRequests.Select(b => b.Hash)
+                .ToPooledList(request.ReceiptsRequests.Count);
+            var ownedReceipts = await peerInfo.SyncPeer.GetReceipts(receiptsHash, cancellationToken);
+            request.Receipts = ownedReceipts;
+        }
+    }
 }