From b6ad979670b7de1883ee0fa0f813517edf8ab96e Mon Sep 17 00:00:00 2001
From: Justin M <37273682+DigitalAlchemist@users.noreply.github.com>
Date: Sun, 17 Jan 2021 02:30:27 +0000
Subject: [PATCH] Fix panic on Ping/WriteMessage for webtorrent

Introduced in anacrolix/torrent #455
---
 webtorrent/tracker_client.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/webtorrent/tracker_client.go b/webtorrent/tracker_client.go
index c5aacaf2..0fe980c7 100644
--- a/webtorrent/tracker_client.go
+++ b/webtorrent/tracker_client.go
@@ -84,7 +84,9 @@ func (tc *TrackerClient) doWebsocket() error {
 		for {
 			select {
 			case <-tc.pingTicker.C:
+				tc.mu.Lock()
 				err := c.WriteMessage(websocket.PingMessage, []byte{})
+				tc.mu.Unlock()
 				if err != nil {
 					return
 				}
-- 
2.44.0