Improved handling for "unexpected shutdown"

(such as DBus down/unavailable)

src/blackcore/application.cpp

@@ -396,6 +396,7 @@ namespace BlackCore
 
     bool CApplication::hasWebDataServices() const
     {
+        if (this->isShuttingDown()) { return false; } // service will not survive for long
         return this->m_webDataServices;
     }
 

src/blackgui/components/cockpitcomcomponent.cpp

@@ -27,6 +27,7 @@
 #include "blackmisc/pq/frequency.h"
 #include "blackmisc/pq/units.h"
 #include "blackmisc/sequence.h"
+#include "blackmisc/verify.h"
 #include "ui_cockpitcomcomponent.h"
 
 #include <QDoubleSpinBox>
@@ -251,13 +252,17 @@ namespace BlackGui
 
         CSimulatedAircraft CCockpitComComponent::getOwnAircraft() const
         {
-            Q_ASSERT(sGui->getIContextOwnAircraft());
+            // unavailable context during shutdown possible
-            if (!sGui->getIContextOwnAircraft()) return CSimulatedAircraft();
+            // mostly when client runs with DBus, but DBus is down
+            if (!sGui || sGui->isShuttingDown() || !sGui->getIContextOwnAircraft()) { return CSimulatedAircraft(); }
             return sGui->getIContextOwnAircraft()->getOwnAircraft();
         }
 
         bool CCockpitComComponent::updateOwnCockpitInContext(const CSimulatedAircraft &ownAircraft)
         {
+            // unavailable context during shutdown possible
+            // mostly when client runs with DBus, but DBus is down
+            if (!sGui || sGui->isShuttingDown() || !sGui->getIContextOwnAircraft()) { return false; }
             return sGui->getIContextOwnAircraft()->updateCockpit(ownAircraft.getCom1System(), ownAircraft.getCom2System(), ownAircraft.getTransponder(), identifier());
         }
 

src/blackgui/components/dbloadoverviewcomponent.cpp

@@ -205,6 +205,7 @@ namespace BlackGui
             {
                 canConnect = CNetworkUtils::canConnect(sharedUrl);
                 allRowsHtml += rowHtml.arg(canConnect ? imgOk : imgFailed, urlLinkHtml.arg(sharedUrl.getFullUrl(), sharedUrl.getHost()));
+                if (!sGui || sGui->isShuttingDown()) { return; } // shutdown during connect test
             }
             ui->lbl_SharedUrls->setText(tableHtml.arg(allRowsHtml.trimmed()));
             ui->lbl_SharedUrls->setToolTip(sGui->getWebDataServices()->getDbReaderCurrentSharedDbDataUrl().toQString());