From ae62fd9c2b5b5e79264d26b3317eef948b6119ac Mon Sep 17 00:00:00 2001
From: Alexander Khodyrev <a@akho.name>
Date: Sat, 14 Sep 2024 11:22:09 +0300
Subject: [PATCH] add mutex lock

---
 birdtown-visit-counter.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/birdtown-visit-counter.go b/birdtown-visit-counter.go
index 6bf4f1e..064241e 100644
--- a/birdtown-visit-counter.go
+++ b/birdtown-visit-counter.go
@@ -55,7 +55,9 @@ func (h *visitsHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	if r.Method == http.MethodGet {
+		h.store.Lock()
 		jsonBytes, err := json.Marshal(h.store.m)
+		h.store.Unlock()
 		if err != nil {
 			w.WriteHeader(http.StatusInternalServerError)
 			w.Write([]byte("cannot serialize"))