From 3838ed7e91fc911107103db888e5b4c9e52fdae4 Mon Sep 17 00:00:00 2001
From: fiatjaf <fiatjaf@gmail.com>
Date: Wed, 26 Apr 2023 08:04:47 -0300
Subject: [PATCH] guard ping writes with the mutex.

fixes https://github.com/nbd-wtf/go-nostr/issues/76#issuecomment-1521170395
---
 relay.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/relay.go b/relay.go
index 2d84d47..5cce0d1 100644
--- a/relay.go
+++ b/relay.go
@@ -119,7 +119,9 @@ func (r *Relay) Connect(ctx context.Context) error {
 		for {
 			select {
 			case <-ticker.C:
+				conn.mutex.Lock()
 				err := conn.socket.WriteMessage(websocket.PingMessage, nil)
+				conn.mutex.Unlock()
 				if err != nil {
 					InfoLogger.Printf("{%s} error writing ping: %v; closing websocket", r.URL, err)
 					return