WIP: persist message stats

server/server_manager.go

@@ -73,9 +73,9 @@ func (s *Server) execManager() {
 	}
 
 	// Print stats
-	s.mu.Lock()
+	s.mu.RLock()
 	messagesCount, topicsCount, visitorsCount := s.messages, len(s.topics), len(s.visitors)
-	s.mu.Unlock()
+	s.mu.RUnlock()
 	log.
 		Tag(tagManager).
 		Fields(log.Context{
@@ -98,6 +98,19 @@ func (s *Server) execManager() {
 	mset(metricUsers, usersCount)
 	mset(metricSubscribers, subscribers)
 	mset(metricTopics, topicsCount)
+
+	// Write stats
+	s.mu.Lock()
+	s.messagesHistory = append(s.messagesHistory, messagesCount)
+	if len(s.messagesHistory) > messagesHistoryMax {
+		s.messagesHistory = s.messagesHistory[1:]
+	}
+	s.mu.Unlock()
+	go func() {
+		if err := s.messageCache.UpdateStats(messagesCount); err != nil {
+			log.Tag(tagManager).Err(err).Warn("Cannot write messages stats")
+		}
+	}()
 }
 
 func (s *Server) pruneVisitors() {