Ref T167, in swift GUI

* removed isContextNetworkAvailableCheck / isContextAudioAvailableCheck
* replaced those by displayDBusReconnectDialog
* using a counter to ignore some errors before showing re-connect dialog

src/swiftguistandard/swiftguistd.cpp

@@ -36,6 +36,7 @@
 #include <QWidget>
 #include <Qt>
 #include <QtGlobal>
+#include <QMessageBox>
 
 class QCloseEvent;
 class QEvent;
@@ -214,20 +215,6 @@ void SwiftGuiStd::ps_loginRequested()
     }
 }
 
-bool SwiftGuiStd::isContextNetworkAvailableCheck()
-{
-    if (m_contextNetworkAvailable) return true;
-    CLogMessage(this).error("Network context not available, no updates this time");
-    return false;
-}
-
-bool SwiftGuiStd::isContextAudioAvailableCheck()
-{
-    if (m_contextAudioAvailable) return true;
-    CLogMessage(this).error("Audio context not available");
-    return false;
-}
-
 void SwiftGuiStd::ps_displayStatusMessageInGui(const CStatusMessage &statusMessage)
 {
     if (!m_init) { return; }
@@ -288,10 +275,8 @@ void SwiftGuiStd::ps_handleTimerBasedUpdates()
 void SwiftGuiStd::setContextAvailability()
 {
     const bool corePreviouslyAvailable = m_coreAvailable;
-    if (sGui &&
-            sGui->getIContextApplication() &&
-            !sGui->isShuttingDown() &&
-            !sGui->getIContextApplication()->isEmptyObject())
+    const bool isShuttingDown = !sGui || sGui->isShuttingDown();
+    if (!isShuttingDown && sGui->getIContextApplication() && !sGui->getIContextApplication()->isEmptyObject())
     {
         // ping to check if core is still alive
         m_coreAvailable = this->isMyIdentifier(sGui->getIContextApplication()->registerApplication(getCurrentTimestampIdentifier()));
@@ -300,7 +285,19 @@ void SwiftGuiStd::setContextAvailability()
     {
         m_coreAvailable = false;
     }
-
+    if (isShuttingDown) { return; }
+    if (m_coreAvailable && m_coreFailures > 0)
+    {
+        m_coreFailures--;
+    }
+    else if (!m_coreAvailable && m_coreFailures < MaxCoreFailures)
+    {
+        m_coreFailures++;
+    }
+    else if (!m_coreAvailable && !m_displayingDBusReconnect)
+    {
+        this->displayDBusReconnectDialog();
+    }
     m_contextNetworkAvailable = m_coreAvailable && sGui->getIContextNetwork() && !sGui->getIContextNetwork()->isEmptyObject();
     m_contextAudioAvailable = m_coreAvailable && sGui->getIContextAudio() && !sGui->getIContextAudio()->isEmptyObject();
 
@@ -443,3 +440,26 @@ void SwiftGuiStd::displayLog()
 {
     ui->comp_MainInfoArea->displayLog();
 }
+
+void SwiftGuiStd::displayDBusReconnectDialog()
+{
+    if (!sGui || sGui->isShuttingDown()) { return; }
+    if (!sGui->getCoreFacade()) { return; }
+    if (m_displayingDBusReconnect) { return; }
+    m_displayingDBusReconnect = true;
+    QMessageBox msgBox(this);
+    msgBox.setIcon(QMessageBox::Critical);
+    msgBox.setText("swift core not reachable.");
+    msgBox.setInformativeText("Do you want to try to reconnect? 'Abort' will close the GUI.");
+    msgBox.setStandardButtons(QMessageBox::Retry | QMessageBox::Abort);
+    msgBox.setDefaultButton(QMessageBox::Retry);
+    const int ret = msgBox.exec();
+    m_displayingDBusReconnect = false;
+    m_coreFailures = 0;
+    if (ret == QMessageBox::Abort)
+    {
+        this->close();
+        return;
+    }
+    sGui->getCoreFacade()->tryToReconnectWithDBus();
+}

src/swiftguistandard/swiftguistd.h

@@ -111,10 +111,13 @@ private:
     bool                        m_init = false;
 
     // contexts
-    bool m_coreAvailable           = false;
-    bool m_contextNetworkAvailable = false;
-    bool m_contextAudioAvailable   = false;
-    QTimer *m_timerContextWatchdog = nullptr;                //!< core available?
+    static constexpr int MaxCoreFailures  = 5; //!< Failures counted before reconnecting
+    int  m_coreFailures            = 0;        //!< failed access to core
+    bool m_coreAvailable           = false;    //!< core already available?
+    bool m_contextNetworkAvailable = false;    //!< network context available?
+    bool m_contextAudioAvailable   = false;    //!< audio context available?
+    bool m_displayingDBusReconnect = false;    //!< currently displaying reconnect dialog
+    QTimer *m_timerContextWatchdog = nullptr;  //!< core available?
     BlackMisc::Simulation::CSimulatedAircraft m_ownAircraft; //!< own aircraft's state
 
     //! GUI status update
@@ -138,12 +141,6 @@ private:
     //! Graceful shutdown
     void performGracefulShutdown();
 
-    //! Context network availability check, otherwise status message
-    bool isContextNetworkAvailableCheck();
-
-    //! Context voice availability check, otherwise status message
-    bool isContextAudioAvailableCheck();
-
     //! Audio device lists
     void setAudioDeviceLists();
 
@@ -173,6 +170,9 @@ private:
     //! Display log
     void displayLog();
 
+    //! Display a reconnect dialog
+    void displayDBusReconnectDialog();
+
 private slots:
     //
     // Data received related slots
@@ -185,8 +185,8 @@ private slots:
     void ps_displayStatusMessageInGui(const BlackMisc::CStatusMessage &statusMessage);
 
     //! Connection status changed
-    //! \param from  old status, as int so it is compliant with DBus
-    //! \param to    new status, as int so it is compliant with DBus
+    //! \param from old status
+    //! \param to   new status
     void ps_onConnectionStatusChanged(BlackCore::INetwork::ConnectionStatus from, BlackCore::INetwork::ConnectionStatus to);
 
     //

src/swiftguistandard/swiftguistdaircraft.cpp

@@ -34,7 +34,7 @@ using namespace BlackMisc::Audio;
 
 bool SwiftGuiStd::ps_reloadOwnAircraft()
 {
-    if (!this->isContextNetworkAvailableCheck()) { return false; }
+    if (!this->m_contextNetworkAvailable) { return false; }
 
     // check for changed aircraft
     bool changed = false;