Update WFS request to accomodate changes in QgsNetworkAccessManager

Because the manager now handles waking up worker threads after
an authentication request, the WFS request handler no longer needs
to do this itself.

Author: nyalldawson

src/providers/wfs/qgswfsrequest.cpp

@@ -131,6 +131,7 @@ bool QgsWfsRequest::sendGET( const QUrl &url, bool synchronous, bool forceRefres
 
   QWaitCondition waitCondition;
   QMutex waitConditionMutex;
+
   bool threadFinished = false;
   bool success = false;
 
@@ -163,20 +164,20 @@ bool QgsWfsRequest::sendGET( const QUrl &url, bool synchronous, bool forceRefres
       {
         auto resumeMainThread = [&waitConditionMutex, &waitCondition]()
         {
+          // when this method is called we have "produced" a single authentication request -- so the buffer is now full
+          // and it's time for the "consumer" (main thread) to do its part
           waitConditionMutex.lock();
           waitCondition.wakeAll();
           waitConditionMutex.unlock();
 
-          waitConditionMutex.lock();
-          waitCondition.wait( &waitConditionMutex );
-          waitConditionMutex.unlock();
+          // note that we don't need to handle waking this thread back up - that's done automatically by QgsNetworkAccessManager
         };
 
-        connect( QgsNetworkAccessManager::instance(), &QgsNetworkAccessManager::authenticationRequired, this, resumeMainThread, Qt::DirectConnection );
+        connect( QgsNetworkAccessManager::instance(), &QgsNetworkAccessManager::authRequestOccurred, this, resumeMainThread, Qt::DirectConnection );
         connect( QgsNetworkAccessManager::instance(), &QgsNetworkAccessManager::proxyAuthenticationRequired, this, resumeMainThread, Qt::DirectConnection );
 
 #ifndef QT_NO_SSL
-        connect( QgsNetworkAccessManager::instance(), &QgsNetworkAccessManager::sslErrors, this, resumeMainThread, Qt::DirectConnection );
+        connect( QgsNetworkAccessManager::instance(), &QgsNetworkAccessManager::sslErrorsOccurred, this, resumeMainThread, Qt::DirectConnection );
 #endif
         QEventLoop loop;
         connect( this, &QgsWfsRequest::downloadFinished, &loop, &QEventLoop::quit, Qt::DirectConnection );
@@ -205,17 +206,16 @@ bool QgsWfsRequest::sendGET( const QUrl &url, bool synchronous, bool forceRefres
       waitCondition.wait( &waitConditionMutex );
 
       // If the downloader thread wakes us (the main thread) up and is not yet finished
-      // he needs the authentication to run.
+      // then it has "produced" an authentication request which we need to now "consume".
       // The processEvents() call gives the auth manager the chance to show a dialog and
       // once done with that, we can wake the downloaderThread again and continue the download.
       if ( !threadFinished )
       {
         waitConditionMutex.unlock();
 
         QgsApplication::instance()->processEvents();
-        waitConditionMutex.lock();
-        waitCondition.wakeAll();
-        waitConditionMutex.unlock();
+        // we don't need to wake up the worker thread - it will automatically be woken when
+        // the auth request has been dealt with by QgsNetworkAccessManager
       }
       else
       {