From 720d2b8eb7be9e2a41126624083054a66017d452 Mon Sep 17 00:00:00 2001
From: Cecylia Bocovich <cohosh@torproject.org>
Date: Mon, 8 Mar 2021 21:50:42 -0500
Subject: [PATCH] Don't log io.ErrClosedPipe in server

These errors are triggered in three places when the OR connection times
out. They don't tell us anything useful and are filling up our logs.
---
 server/server.go | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/server/server.go b/server/server.go
index 3b263d0..b3fa04a 100644
--- a/server/server.go
+++ b/server/server.go
@@ -73,7 +73,7 @@ func proxy(local *net.TCPConn, conn net.Conn) {
 	wg.Add(2)
 
 	go func() {
-		if _, err := io.Copy(conn, local); err != nil {
+		if _, err := io.Copy(conn, local); err != nil && err != io.ErrClosedPipe {
 			log.Printf("error copying ORPort to WebSocket %v", err)
 		}
 		if err := local.CloseRead(); err != nil {
@@ -83,7 +83,7 @@ func proxy(local *net.TCPConn, conn net.Conn) {
 		wg.Done()
 	}()
 	go func() {
-		if _, err := io.Copy(local, conn); err != nil {
+		if _, err := io.Copy(local, conn); err != nil && err != io.ErrClosedPipe {
 			log.Printf("error copying WebSocket to ORPort %v", err)
 		}
 		if err := local.CloseWrite(); err != nil {
@@ -352,7 +352,7 @@ func acceptSessions(ln *kcp.Listener) error {
 		go func() {
 			defer conn.Close()
 			err := acceptStreams(conn)
-			if err != nil {
+			if err != nil && err != io.ErrClosedPipe {
 				log.Printf("acceptStreams: %v", err)
 			}
 		}()