Exirmirai's server hibernation mode

JACoders#826

Author: Bucky21659

codemp/qcommon/common.cpp

@@ -1426,7 +1426,7 @@ int Com_ModifyMsec( int msec ) {
 		// dedicated servers don't want to clamp for a much longer
 		// period, because it would mess up all the client's views
 		// of time.
-		if ( com_sv_running->integer && msec > 500 ) {
+		if ( !svs.hibernation.enabled && com_sv_running->integer && msec > 500 ) {
 			Com_Printf( "Hitch warning: %i msec frame time\n", msec );
 		}
 		clampTime = 5000;

codemp/server/server.h

@@ -23,6 +23,9 @@ along with this program; if not, see <http://www.gnu.org/licenses/>.
 
 #pragma once
 
+#include <chrono>
+#include <string>
+
 #include "qcommon/q_shared.h"
 #include "qcommon/qcommon.h"
 #include "game/g_public.h"
@@ -217,6 +220,13 @@ typedef struct serverStatic_s {
 	netadr_t	authorizeAddress;			// for rcon return messages
 
 	qboolean	gameStarted;				// gvm is loaded
+
+	struct {
+		qboolean enabled;
+		int lastTimeDisconnected;
+		float sv_fps;
+	} hibernation;
+
 } serverStatic_t;
 
 #define SERVER_MAXBANS	1024
@@ -278,6 +288,7 @@ extern	cvar_t	*sv_legacyFixes;
 extern	cvar_t	*sv_banFile;
 
 extern	cvar_t	*sv_snapShotDuelCull;
+extern	cvar_t	*sv_hibernateTime;
 
 extern	serverBan_t serverBans[SERVER_MAXBANS];
 extern	int serverBansCount;

codemp/server/sv_client.cpp

@@ -337,6 +337,10 @@ void SV_DirectConnect( netadr_t from ) {
 		return;
 	}
 
+	Cvar_SetValue("sv_fps", svs.hibernation.sv_fps);
+	svs.hibernation.enabled = qfalse;
+	Com_Printf("Server restored from hibernation\n");
+
 	SV_UserinfoChanged( newcl );
 
 	// send the connect packet to the client
@@ -424,6 +428,14 @@ void SV_DropClient( client_t *drop, const char *reason ) {
 	// to the master so it is known the server is empty
 	// send a heartbeat now so the master will get up to date info
 	// if there is already a slot for this ip, reuse it
+
+	int players = 0;
+	for (i = 0; i < sv_maxclients->integer; i++) {
+		if (svs.clients[i].state >= CS_CONNECTED && svs.clients[i].netchan.remoteAddress.type != NA_BOT) {
+			players++;
+		}
+	}
+
 	for (i=0 ; i < sv_maxclients->integer ; i++ ) {
 		if ( svs.clients[i].state >= CS_CONNECTED ) {
 			break;
@@ -432,6 +444,11 @@ void SV_DropClient( client_t *drop, const char *reason ) {
 	if ( i == sv_maxclients->integer ) {
 		SV_Heartbeat_f();
 	}
+
+	if (players == 0) {
+		svs.hibernation.lastTimeDisconnected = Sys_Milliseconds();
+	}
+
 }
 
 void SV_CreateClientGameStateMessage( client_t *client, msg_t *msg ) {

codemp/server/sv_init.cpp

@@ -1011,6 +1011,8 @@ void SV_Init (void) {
 	sv_banFile = Cvar_Get( "sv_banFile", "serverbans.dat", CVAR_ARCHIVE, "File to use to store bans and exceptions" );
 
 	sv_snapShotDuelCull = Cvar_Get("sv_snapShotDuelCull", "1", CVAR_NONE, "Snapshot-based duel isolation");
+	sv_hibernateTime = Cvar_Get("sv_hibernateTime", "0", CVAR_ARCHIVE_ND, "Time after which server will enter hibernation mode");
+	svs.hibernation.sv_fps = sv_fps->value;
 
 	// initialize bot cvars so they are listed and can be set before loading the botlib
 	SV_BotInitCvars();

codemp/server/sv_main.cpp

@@ -71,6 +71,7 @@ cvar_t	*sv_legacyFixes;
 cvar_t	*sv_banFile;
 
 cvar_t	*sv_snapShotDuelCull;
+cvar_t	*sv_hibernateTime;
 
 serverBan_t serverBans[SERVER_MAXBANS];
 int serverBansCount = 0;
@@ -1151,6 +1152,27 @@ void SV_Frame( int msec ) {
 		return;
 	}
 
+	if (svs.initialized && svs.gameStarted) {
+		int i = 0;
+		int players = 0;
+		for (i = 0; i < sv_maxclients->integer; i++) {
+			if (svs.clients[i].state >= CS_CONNECTED && svs.clients[i].netchan.remoteAddress.type != NA_BOT) {
+				players++;
+			}
+		}
+
+		//Check for hibernation mode
+		if (sv_hibernateTime->integer && !svs.hibernation.enabled && !players) {
+			int elapsed_time = Sys_Milliseconds() - svs.hibernation.lastTimeDisconnected;
+			if (elapsed_time >= sv_hibernateTime->integer) {
+				Cvar_Set("sv_fps", "1");
+				sv_fps->value = svs.hibernation.sv_fps;
+				svs.hibernation.enabled = qtrue;
+				Com_Printf("Server entered hibernation mode\n");
+			}
+		}
+	}
+
 	if ( !com_sv_running->integer ) {
 		return;
 	}