Add Server.LastCommandName().

log.go

@@ -73,6 +73,18 @@ func (l *Log) IsEmpty() bool {
 	return (len(l.entries) == 0)
 }
 
+// The name of the last command in the log.
+func (l *Log) LastCommandName() string {
+	l.mutex.Lock()
+	defer l.mutex.Unlock()
+	if len(l.entries) > 0 {
+		if command := l.entries[len(l.entries)-1].Command; command != nil {
+			return command.CommandName()
+		}
+	}
+	return ""
+}
+
 //--------------------------------------
 // Log Terms
 //--------------------------------------

server.go

@@ -150,17 +150,31 @@ func (s *Server) VotedFor() string {
 
 // Retrieves whether the server's log has no entries.
 func (s *Server) IsLogEmpty() bool {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
 	return s.log.IsEmpty()
 }
 
 // A list of all the log entries. This should only be used for debugging purposes.
 func (s *Server) LogEntries() []*LogEntry {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
 	if s.log != nil {
 		return s.log.entries
 	}
 	return nil
 }
 
+// A reference to the command name of the last entry.
+func (s *Server) LastCommandName() string {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+	if s.log != nil {
+		return s.log.LastCommandName()
+	}
+	return ""
+}
+
 //--------------------------------------
 // Membership
 //--------------------------------------