(svn r10462) -Add: a command dumper/loader that could be enabled compile-time and server side only to aid debugging some desyncs, i.e. dump the stream of commands so it could be replayed in exactly the same way later. This should primarily be used to make desyncs more easily reproducable, so it can be properly debugged.

3 files changed, 68 insertions, 0 deletions

diff --git a/src/network/network.cpp b/src/network/network.cpp
index 52f6ddbb0..5b7ab937c 100644
--- a/src/network/network.cpp
+++ b/src/network/network.cpp
@@ -37,6 +37,7 @@
 #include "../console.h" /* IConsoleCmdExec */
 #include <stdarg.h> /* va_list */
 #include "../md5.h"
+#include "../fileio.h"
 
 /* Check whether NETWORK_NUM_LANDSCAPES is still in sync with NUM_LANDSCAPE */
 assert_compile((int)NETWORK_NUM_LANDSCAPES == (int)NUM_LANDSCAPE);
@@ -195,6 +196,9 @@ void CDECL NetworkTextMessage(NetworkAction action, uint16 color, bool self_send
 			break;
 	}
 
+#ifdef DEBUG_DUMP_COMMANDS
+	debug_dump_commands("ddc:cmsg:%d;%d;%s\n", _date, _date_fract, message);
+#endif /* DUMP_COMMANDS */
 	IConsolePrintF(color, "%s", message);
 	AddTextMessage(color, duration, "%s", message);
 }
@@ -1235,6 +1239,9 @@ static bool NetworkDoClientLoop()
 			if (_sync_seed_1 != _random_seeds[0][0]) {
 #endif
 				NetworkError(STR_NETWORK_ERR_DESYNC);
+#ifdef DEBUG_DUMP_COMMANDS
+				debug_dump_commands("ddc:serr:%d;%d\n", _date, _date_fract);
+#endif /* DUMP_COMMANDS */
 				DEBUG(net, 0, "Sync error detected!");
 				NetworkClientError(NETWORK_RECV_STATUS_DESYNC, DEREF_CLIENT(0));
 				return false;
@@ -1280,6 +1287,37 @@ void NetworkGameLoop()
 	if (!NetworkReceive()) return;
 
 	if (_network_server) {
+#ifdef DEBUG_DUMP_COMMANDS
+		static FILE *f = FioFOpenFile("commands.log", "rb", SAVE_DIR);
+		static Date next_date = 0;
+		static uint32 next_date_fract;
+		static CommandPacket *cp = NULL;
+		if (f == NULL && next_date == 0) {
+			printf("Cannot open commands.log\n");
+			next_date = 1;
+		}
+
+		while (f != NULL && !feof(f)) {
+			if (cp != NULL && _date == next_date && _date_fract == next_date_fract) {
+				_current_player = cp->player;
+				_cmd_text = cp->text;
+				DoCommandP(cp->tile, cp->p1, cp->p2, NULL, cp->cmd);
+				free(cp);
+				cp = NULL;
+			}
+
+			if (cp != NULL) break;
+
+			char buff[4096];
+			if (fgets(buff, lengthof(buff), f) == NULL) break;
+			if (strncmp(buff, "ddc:cmd:", 8) != 0) continue;
+			cp = MallocT<CommandPacket>(1);
+			int player;
+			sscanf(&buff[8], "%d;%d;%d;%d;%d;%d;%d;%s", &next_date, &next_date_fract, &player, &cp->tile, &cp->p1, &cp->p2, &cp->cmd, cp->text);
+			cp->player = (Owner)player;
+		}
+#endif /* DUMP_COMMANDS */
+
 		bool send_frame = false;
 
 		// We first increase the _frame_counter
@@ -1436,4 +1474,18 @@ bool IsNetworkCompatibleVersion(const char *other)
 			strncmp(_openttd_revision, other, NETWORK_REVISION_LENGTH - 1) == 0;
 }
 
+#ifdef DEBUG_DUMP_COMMANDS
+void CDECL debug_dump_commands(const char *s, ...)
+{
+	static FILE *f = FioFOpenFile("commands-out.log", "wb", SAVE_DIR);
+	if (f == NULL) return;
+
+	va_list va;
+	va_start(va, s);
+	vfprintf(f, s, va);
+	va_end(va);
+
+	fflush(f);
+}
+#endif /* DEBUG_DUMP_COMMANDS */
 #endif /* ENABLE_NETWORK */
diff --git a/src/network/network.h b/src/network/network.h
index c20e9b3f8..9907716ac 100644
--- a/src/network/network.h
+++ b/src/network/network.h
@@ -20,6 +20,17 @@
 //  nothing will happen.
 //#define ENABLE_NETWORK_SYNC_EVERY_FRAME
 
+/*
+ * Dumps all commands that are sent/received to stderr and saves every month.
+ * This log can become quite large over time; say in the order of two to three
+ * times the bandwidth used for network games.
+ */
+//#define DEBUG_DUMP_COMMANDS
+
+#ifdef DEBUG_DUMP_COMMANDS
+void CDECL debug_dump_commands(const char *s, ...);
+#endif /* DEBUG_DUMP_COMMANDS */
+
 // In theory sending 1 of the 2 seeds is enough to check for desyncs
 //   so in theory, this next define can be left off.
 //#define NETWORK_SEND_DOUBLE_SEED
diff --git a/src/network/network_data.cpp b/src/network/network_data.cpp
index 627d5bfbd..3e148cb43 100644
--- a/src/network/network_data.cpp
+++ b/src/network/network_data.cpp
@@ -97,6 +97,11 @@ void NetworkExecuteCommand(CommandPacket *cp)
 		DEBUG(net, 0, "Received out-of-bounds callback (%d)", cp->callback);
 		cp->callback = 0;
 	}
+
+#ifdef DEBUG_DUMP_COMMANDS
+	debug_dump_commands("ddc:cmd:%d;%d;%d;%d;%d;%d;%d;%s\n", _date, _date_fract, (int)cp->player, cp->tile, cp->p1, cp->p2, cp->cmd, cp->text);
+#endif /* DUMP_COMMANDS */
+
 	DoCommandP(cp->tile, cp->p1, cp->p2, _callback_table[cp->callback], cp->cmd | CMD_NETWORK_COMMAND);
 }