From c1444f8c1ddae1bdb0fe28d20c5a6474c2b4e4da Mon Sep 17 00:00:00 2001
From: eleksir <eleksir@exs-elm.ru>
Date: Sat, 4 Apr 2026 15:22:50 +0300
Subject: [PATCH] Add cancellation after read and before write, to be able to
 cancel operation more quickly

---
 internal/backer/newServer.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/internal/backer/newServer.go b/internal/backer/newServer.go
index 7e362d2..37e1d5e 100644
--- a/internal/backer/newServer.go
+++ b/internal/backer/newServer.go
@@ -227,6 +227,12 @@ func copyWithContext(ctx context.Context, dst io.Writer, src io.Reader) error {
 
 		n, readErr := src.Read(buf)
 		if n > 0 {
+			select {
+			case <-ctx.Done():
+				return ctx.Err()
+			default:
+			}
+
 			if _, werr := dst.Write(buf[:n]); werr != nil {
 				return werr
 			}