From 21e5ca5c3d539f94e8dc563350acd97c5400154f Mon Sep 17 00:00:00 2001
From: "M@" <m@cognusion.com>
Date: Mon, 6 Jul 2020 15:36:52 -0400
Subject: [PATCH] Fixes race in getKeyMetadata accessor, when called from
 KeyMetadata (#233)

---
 bigcache.go | 2 +-
 shard.go    | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/bigcache.go b/bigcache.go
index d5de8144..b59eba08 100644
--- a/bigcache.go
+++ b/bigcache.go
@@ -193,7 +193,7 @@ func (c *BigCache) Stats() Stats {
 func (c *BigCache) KeyMetadata(key string) Metadata {
 	hashedKey := c.hash.Sum64(key)
 	shard := c.getShard(hashedKey)
-	return shard.getKeyMetadata(hashedKey)
+	return shard.getKeyMetadataWithLock(hashedKey)
 }
 
 // Iterator returns iterator function to iterate over EntryInfo's from whole cache.
diff --git a/shard.go b/shard.go
index a7e9f119..a11e7060 100644
--- a/shard.go
+++ b/shard.go
@@ -341,6 +341,15 @@ func (s *cacheShard) getStats() Stats {
 	return stats
 }
 
+func (s *cacheShard) getKeyMetadataWithLock(key uint64) Metadata {
+	s.lock.RLock()
+	c := s.hashmapStats[key]
+	s.lock.RUnlock()
+	return Metadata{
+		RequestCount: c,
+	}
+}
+
 func (s *cacheShard) getKeyMetadata(key uint64) Metadata {
 	return Metadata{
 		RequestCount: s.hashmapStats[key],