Core/DBLayer: Fix MySQL timeout issue. World runnable will now call KeepAlive on each database after a specified number of seconds (MaxPingTime in worldserver.conf)

Based on patch by kingarus81
Fixes issue #4062

Also remove explicit numbering from WorldTimers enum

--HG--
branch : trunk

src/server/game/World/World.cpp

@@ -1206,6 +1206,9 @@ void World::LoadConfigSettings(bool reload)
     m_int_configs[CONFIG_AUTOBROADCAST_CENTER] = sConfig.GetIntDefault("AutoBroadcast.Center", 0);
     m_int_configs[CONFIG_AUTOBROADCAST_INTERVAL] = sConfig.GetIntDefault("AutoBroadcast.Timer", 60000);
 
+    // MySQL ping time interval
+    m_int_configs[CONFIG_DB_PING_INTERVAL] = sConfig.GetIntDefault("MaxPingTime", 1800);
+
     sScriptMgr.OnConfigLoad(reload);
 }
 
@@ -1663,6 +1666,8 @@ void World::SetInitialWorldSettings()
     m_timers[WUPDATE_AUTOBROADCAST].SetInterval(getIntConfig(CONFIG_AUTOBROADCAST_INTERVAL));
     m_timers[WUPDATE_DELETECHARS].SetInterval(DAY*IN_MILLISECONDS); // check for chars to delete every day
 
+    m_timers[WUPDATE_PINGDB].SetInterval(getIntConfig(CONFIG_DB_PING_INTERVAL)*IN_MILLISECONDS);    // Mysql ping time in seconds
+
     //to set mailtimer to return mails every day between 4 and 5 am
     //mailtimer is increased when updating auctions
     //one second is 1000 -(tested on win system)
@@ -1986,6 +1991,16 @@ void World::Update(uint32 diff)
         m_timers[WUPDATE_EVENTS].Reset();
     }
 
+    ///- Ping to keep MySQL connections alive
+    if (m_timers[WUPDATE_PINGDB].Passed())
+    {
+        m_timers[WUPDATE_PINGDB].Reset();
+        sLog.outDetail("Ping MySQL to keep connection alive");
+        CharacterDatabase.KeepAlive();
+        LoginDatabase.KeepAlive();
+        WorldDatabase.KeepAlive();
+    }
+
     // update the instance reset times
     sInstanceSaveMgr.Update();
 

src/server/game/World/World.h

@@ -71,18 +71,19 @@ enum ShutdownExitCode
 /// Timers for different object refresh rates
 enum WorldTimers
 {
-    WUPDATE_OBJECTS     = 0,
-    WUPDATE_SESSIONS    = 1,
-    WUPDATE_AUCTIONS    = 2,
-    WUPDATE_WEATHERS    = 3,
-    WUPDATE_UPTIME      = 4,
-    WUPDATE_CORPSES     = 5,
-    WUPDATE_EVENTS      = 6,
-    WUPDATE_CLEANDB     = 7,
-    WUPDATE_AUTOBROADCAST = 8,
-    WUPDATE_MAILBOXQUEUE = 9,
-    WUPDATE_DELETECHARS = 10,
-    WUPDATE_COUNT       = 11
+    WUPDATE_OBJECTS,
+    WUPDATE_SESSIONS,
+    WUPDATE_AUCTIONS,
+    WUPDATE_WEATHERS,
+    WUPDATE_UPTIME,
+    WUPDATE_CORPSES,
+    WUPDATE_EVENTS,
+    WUPDATE_CLEANDB,
+    WUPDATE_AUTOBROADCAST,
+    WUPDATE_MAILBOXQUEUE,
+    WUPDATE_DELETECHARS,
+    WUPDATE_PINGDB,
+    WUPDATE_COUNT
 };
 
 /// Configuration elements
@@ -306,6 +307,7 @@ enum WorldIntConfigs
     CONFIG_AUTOBROADCAST_CENTER,
     CONFIG_AUTOBROADCAST_INTERVAL,
     CONFIG_MAX_RESULTS_LOOKUP_COMMANDS,
+    CONFIG_DB_PING_INTERVAL,
     INT_CONFIG_VALUE_COUNT
 };