(svn r21254) -Change: show a different "lag" message when a client is lagging because of connection trouble or lagging because the client is just slow

src/network/core/tcp_game.cpp

@@ -30,6 +30,7 @@ NetworkGameSocketHandler::NetworkGameSocketHandler(SOCKET s)
 	this->sock              = s;
 	this->last_frame        = _frame_counter;
 	this->last_frame_server = _frame_counter;
+	this->last_packet       = _realtime_tick;
 }
 
 /**
@@ -70,6 +71,8 @@ NetworkRecvStatus NetworkGameSocketHandler::HandlePacket(Packet *p)
 {
 	PacketGameType type = (PacketGameType)p->Recv_uint8();
 
+	this->last_packet = _realtime_tick;
+
 	switch (this->HasClientQuit() ? PACKET_END : type) {
 		GAME_COMMAND(PACKET_SERVER_FULL)
 		GAME_COMMAND(PACKET_SERVER_BANNED)

src/network/core/tcp_game.h

@@ -473,6 +473,7 @@ public:
 	uint32 last_frame;           ///< Last frame we have executed
 	uint32 last_frame_server;    ///< Last frame the server has executed
 	CommandQueue incoming_queue; ///< The command-queue awaiting handling
+	uint last_packet;            ///< Time we received the last frame.
 
 	NetworkRecvStatus CloseConnection(bool error = true);
 	virtual NetworkRecvStatus CloseConnection(NetworkRecvStatus status) = 0;

src/network/network_server.cpp

@@ -1522,14 +1522,23 @@ void NetworkServer_Tick(bool send_frame)
 				if (lag > 3) {
 					/* Client did still not report in after 4 game-day, drop him
 					 *  (that is, the 3 of above, + 1 before any lag is counted) */
-					IConsolePrintF(CC_ERROR,"Client #%d is dropped because the client did not respond for more than 4 game-days", cs->client_id);
+					IConsolePrintF(CC_ERROR, cs->last_packet + 3 * DAY_TICKS * MILLISECONDS_PER_TICK > _realtime_tick ?
+							/* A packet was received in the last three game days, so the client is likely lagging behind. */
+								"Client #%d is dropped because the client's game state is more than 4 game-days behind" :
+							/* No packet was received in the last three game days; sounds like a lost connection. */
+								"Client #%d is dropped because the client did not respond for more than 4 game-days",
+							cs->client_id);
 					cs->CloseConnection(NETWORK_RECV_STATUS_SERVER_ERROR);
 					continue;
 				}
 
-				/* Report once per time we detect the lag */
-				if (cs->lag_test == 0) {
-					IConsolePrintF(CC_WARNING,"[%d] Client #%d is slow, try increasing *net_frame_freq to a higher value!", _frame_counter, cs->client_id);
+				/* Report once per time we detect the lag, and only when we
+				 * received a packet in the last 2000 milliseconds. If we
+				 * did not receive a packet, then the client is not just
+				 * slow, but the connection is likely severed. Mentioning
+				 * frame_freq is not useful in this case. */
+				if (cs->lag_test == 0 && cs->last_packet + DAY_TICKS * MILLISECONDS_PER_TICK > _realtime_tick) {
+					IConsolePrintF(CC_WARNING,"[%d] Client #%d is slow, try increasing [network.]frame_freq to a higher value!", _frame_counter, cs->client_id);
 					cs->lag_test = 1;
 				}
 			} else {