Server: throw exception in GetMap if DB connection is not ok

python/core/auto_generated/layout/qgslayoutitemmap.sip.in

@@ -569,6 +569,7 @@ in the area of the map item covered by the item.
 .. versionadded:: 3.6
 %End
 
+
   protected:
 
     virtual void draw( QgsLayoutItemRenderContext &context );

src/core/layout/qgslayoutitemmap.cpp

@@ -1020,6 +1020,14 @@ void QgsLayoutItemMap::drawMap( QPainter *painter, const QgsRectangle &extent, Q
   // with printing to printer on Windows (printing to PDF is fine though).
   // Raster images were not displayed - see #10599
   job.renderSynchronously();
+
+  mRenderingErrors.clear();
+  QgsMapRendererJob::Errors e = job.errors();
+  QgsMapRendererJob::Errors::const_iterator eIt = e.constBegin();
+  for ( ; eIt != e.constEnd(); ++eIt )
+  {
+    mRenderingErrors.append( qMakePair( eIt->layerID, eIt->message ) );
+  }
 }
 
 void QgsLayoutItemMap::recreateCachedImageInBackground()

src/core/layout/qgslayoutitemmap.h

@@ -511,6 +511,12 @@ class CORE_EXPORT QgsLayoutItemMap : public QgsLayoutItem
      */
     bool isLabelBlockingItem( QgsLayoutItem *item ) const;
 
+    /**
+     * @brief renderingErrors
+     * @return list of layer id / error message
+     */
+    const QList< QPair< QString, QString > > &renderingErrors() const SIP_SKIP { return mRenderingErrors; }
+
   protected:
 
     void draw( QgsLayoutItemRenderContext &context ) override;
@@ -726,6 +732,9 @@ class CORE_EXPORT QgsLayoutItemMap : public QgsLayoutItem
     QStringList mBlockingLabelItemUuids;
     QList< QPointer< QgsLayoutItem > > mBlockingLabelItems;
 
+    //!layer id / error message
+    QList< QPair< QString, QString > > mRenderingErrors;
+
     void init();
 
     //! Resets the item tooltip to reflect current map id

src/server/qgsfcgiserverrequest.cpp

@@ -68,7 +68,7 @@ QgsFcgiServerRequest::QgsFcgiServerRequest()
   }
 
   // Store the URL before the server rewrite that could have been set in QUERY_STRING
-  mOriginalUrl = url;
+  //mOriginalUrl = url;
 
   // OGC parameters are passed with the query string, which is normally part of
   // the REQUEST_URI, we override the query string url in case it is defined

src/server/services/wms/qgswmsrenderer.cpp

@@ -572,6 +572,15 @@ namespace QgsWms
                                     QStringLiteral( "Output format '%1' is not supported in the GetPrint request" ).arg( formatString ) );
     }
 
+    if ( atlas )
+    {
+      handlePrintErrors( atlas->layout() );
+    }
+    else
+    {
+      handlePrintErrors( layout.get() );
+    }
+
     return tempOutputFile.readAll();
   }
 
@@ -3250,4 +3259,24 @@ namespace QgsWms
     std::unique_ptr<QImage> tmpImage( createImage( 1, 1, false ) );
     return tmpImage->dotsPerMeterX() / 1000.0;
   }
+
+  void QgsRenderer::handlePrintErrors( const QgsLayout *layout )
+  {
+    if ( !layout )
+    {
+      return;
+    }
+    QList< QgsLayoutItemMap * > mapList;
+    layout->layoutItems( mapList );
+
+    QList< QgsLayoutItemMap * >::const_iterator mapIt = mapList.constBegin();
+    for ( ; mapIt != mapList.constEnd(); ++mapIt )
+    {
+      if ( !( *mapIt )->renderingErrors().isEmpty() )
+      {
+        throw QgsServerException( QStringLiteral( "Print error" ) );
+      }
+    }
+  }
+
 } // namespace QgsWms

src/server/services/wms/qgswmsrenderer.h

@@ -30,6 +30,7 @@
 class QgsCoordinateReferenceSystem;
 class QgsPrintLayout;
 class QgsFeature;
+class QgsLayout;
 class QgsMapLayer;
 class QgsMapSettings;
 class QgsPointXY;
@@ -284,6 +285,8 @@ namespace QgsWms
 
       void removeTemporaryLayers();
 
+      void handlePrintErrors( const QgsLayout *layout );
+
     private:
 
       const QgsWmsParameters &mWmsParameters;