DB IDO: Do not deactivate objects during application reload/restart

This follows the same principle as with the shutdown handler,
and was introduced with the changed reload handling with 2.9.
Previously IsShuttingDown() was sufficient which got set at one
location.

SigUsr2 as handler introduced a new location where m_ShuttingDown
is not necessarily set yet. Since this handler gets called when
l_Restarting is enabled, we'll use this flag to avoid config update
events resulting in object deactivation (object->IsActive() always
returns false).

refs #5996
refs #6691
refs #6970

fixes #7125

lib/base/application.cpp

@@ -353,6 +353,11 @@ bool Application::IsShuttingDown()
 	return m_ShuttingDown;
 }
 
+bool Application::IsRestarting()
+{
+	return l_Restarting;
+}
+
 void Application::OnShutdown()
 {
 	/* Nothing to do here. */

lib/base/application.hpp

@@ -58,6 +58,7 @@ class Application : public ObjectImpl<Application> {
 	static void RequestReopenLogs();
 
 	static bool IsShuttingDown();
+	static bool IsRestarting();
 
 	static void SetDebuggingSeverity(LogSeverity severity);
 	static LogSeverity GetDebuggingSeverity();

lib/db_ido/dbconnection.cpp

@@ -375,7 +375,26 @@ bool DbConnection::GetStatusUpdate(const DbObject::Ptr& dbobj) const
 
 void DbConnection::UpdateObject(const ConfigObject::Ptr& object)
 {
-	if (!GetConnected() || Application::IsShuttingDown())
+	bool isShuttingDown = Application::IsShuttingDown();
+	bool isRestarting = Application::IsRestarting();
+
+#ifdef I2_DEBUG
+	if (isShuttingDown || isRestarting) {
+		//Log(LogDebug, "DbConnection")
+		//	<< "Updating object '" << object->GetName() << "' \t\t active '" << Convert::ToLong(object->IsActive())
+		//	<< "' shutting down '" << Convert::ToLong(isShuttingDown) << "' restarting '" << Convert::ToLong(isRestarting) << "'.";
+	}
+#endif /* I2_DEBUG */
+
+	/* Wait until a database connection is established on reconnect. */
+	if (!GetConnected())
+		return;
+
+	/* Don't update inactive objects during shutdown/reload/restart.
+	 * They would be marked as deleted. This gets triggered with ConfigObject::StopObjects().
+	 * During startup/reconnect this is fine, the handler is not active there.
+	 */
+	if (isShuttingDown || isRestarting)
 		return;
 
 	DbObject::Ptr dbobj = DbObject::GetOrCreateByObject(object);
@@ -402,7 +421,10 @@ void DbConnection::UpdateObject(const ConfigObject::Ptr& object)
 				dbobj->SendConfigUpdateLight();
 			}
 		} else if (!active) {
-			/* Deactivate the deleted object no matter
+			/* This may happen on reload/restart actions too
+			 * and is blocked above already.
+			 *
+			 * Deactivate the deleted object no matter
 			 * which state it had in the database.
 			 */
 			DeactivateObject(dbobj);