Fixing should send event removing extra go channel creation (#4942)

store/sql_channel_store.go

@@ -839,6 +839,27 @@ func (us SqlChannelStore) InvalidateMemberCount(channelId string) {
 	channelMemberCountsCache.Remove(channelId)
 }
 
+func (s SqlChannelStore) GetMemberCountFromCache(channelId string) int64 {
+	metrics := einterfaces.GetMetricsInterface()
+
+	if cacheItem, ok := channelMemberCountsCache.Get(channelId); ok {
+		if metrics != nil {
+			metrics.IncrementMemCacheHitCounter("Channel Member Counts")
+		}
+		return cacheItem.(int64)
+	} else {
+		if metrics != nil {
+			metrics.IncrementMemCacheMissCounter("Channel Member Counts")
+		}
+	}
+
+	if result := <-s.GetMemberCount(channelId, true); result.Err != nil {
+		return 0
+	} else {
+		return result.Data.(int64)
+	}
+}
+
 func (s SqlChannelStore) GetMemberCount(channelId string, allowFromCache bool) StoreChannel {
 	storeChannel := make(StoreChannel, 1)
 	metrics := einterfaces.GetMetricsInterface()

store/sql_channel_store_test.go

@@ -419,6 +419,14 @@ func TestChannelMemberStore(t *testing.T) {
 		t.Fatal("should have saved 2 members")
 	}
 
+	if store.Channel().GetMemberCountFromCache(o1.ChannelId) != 2 {
+		t.Fatal("should have saved 2 members")
+	}
+
+	if store.Channel().GetMemberCountFromCache("junk") != 0 {
+		t.Fatal("should have saved 0 members")
+	}
+
 	count = (<-store.Channel().GetMemberCount(o1.ChannelId, false)).Data.(int64)
 	if count != 2 {
 		t.Fatal("should have saved 2 members")

store/store.go

@@ -108,6 +108,7 @@ type ChannelStore interface {
 	IsUserInChannelUseCache(userId string, channelId string) bool
 	GetMemberForPost(postId string, userId string) StoreChannel
 	InvalidateMemberCount(channelId string)
+	GetMemberCountFromCache(channelId string) int64
 	GetMemberCount(channelId string, allowFromCache bool) StoreChannel
 	RemoveMember(channelId string, userId string) StoreChannel
 	PermanentDeleteMembersByUser(userId string) StoreChannel