From 61c1586082d21ad793447c3c4510230b492ffbc0 Mon Sep 17 00:00:00 2001
From: Irine Sistiana <49315432+IrineSistiana@users.noreply.github.com>
Date: Wed, 20 Sep 2023 09:31:39 +0800
Subject: [PATCH 2/6] server: don't exit udp server on tempory read err

---
 pkg/server/udp.go | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/pkg/server/udp.go b/pkg/server/udp.go
index 247455b..4dc1087 100644
--- a/pkg/server/udp.go
+++ b/pkg/server/udp.go
@@ -62,7 +62,13 @@ func ServeUDP(c *net.UDPConn, h Handler, opts UDPServerOpts) error {
 	for {
 		n, oobn, _, remoteAddr, err := c.ReadMsgUDPAddrPort(*rb, ob)
 		if err != nil {
-			return fmt.Errorf("unexpected read err: %w", err)
+			if n == 0 {
+				// err with zero read. Most likely becasue c was closed.
+				return fmt.Errorf("unexpected read err: %w", err)
+			}
+			// err with some read. Tempory err.
+			logger.Warn("read err", zap.Error(err))
+			continue
 		}
 
 		q := new(dns.Msg)
-- 
2.34.8