Track online status in FileDB

controller/FileDB.hpp

@@ -48,6 +48,11 @@ public:
 protected:
 	std::string _networksPath;
 	std::string _tracePath;
+	std::thread _onlineUpdateThread;
+	std::map< uint64_t,std::map<uint64_t,std::map<int64_t,InetAddress> > > _online;
+	std::mutex _online_l;
+	bool _onlineChanged;
+	bool _running;
 };
 
 } // namespace ZeroTier