Working on safer msg downloading/saving.

src/core/feeddownloader.cpp

@@ -27,12 +27,14 @@
 
 
 FeedDownloader::FeedDownloader(QObject *parent)
-  : QObject(parent), m_results(FeedDownloadResults()), m_feedsUpdated(0), m_feedsToUpdate(0),
+  : QObject(parent), m_results(FeedDownloadResults()), m_msgUpdateMutex(new QMutex()), m_feedsUpdated(0), m_feedsToUpdate(0),
     m_feedsUpdating(0), m_feedsTotalCount(0), m_stopUpdate(false) {
   qRegisterMetaType<FeedDownloadResults>("FeedDownloadResults");
 }
 
 FeedDownloader::~FeedDownloader() {
+  m_msgUpdateMutex->unlock();
+  delete m_msgUpdateMutex;
   qDebug("Destroying FeedDownloader instance.");
 }
 
@@ -79,7 +81,7 @@ void FeedDownloader::updateFeeds(const QList<Feed*> &feeds) {
       break;
     }
 
-    connect(feeds.at(i), SIGNAL(updated(int)), this, SLOT(oneFeedUpdateFinished(int)),
+    connect(feeds.at(i), &Feed::messagesObtained, this, &FeedDownloader::oneFeedUpdateFinished,
             (Qt::ConnectionType) (Qt::UniqueConnection | Qt::AutoConnection));
     QThreadPool::globalInstance()->start(feeds.at(i));
 
@@ -92,14 +94,24 @@ void FeedDownloader::stopRunningUpdate() {
   m_stopUpdate = true;
 }
 
-void FeedDownloader::oneFeedUpdateFinished(int updated_messages) {
+void FeedDownloader::oneFeedUpdateFinished(const QList<Message> &messages) {
-  const Feed *feed = qobject_cast<Feed*>(sender());
+  Feed *feed = qobject_cast<Feed*>(sender());
 
-  disconnect(feed, SIGNAL(updated(int)), this, SLOT(oneFeedUpdateFinished(int)));
+  disconnect(feed, &Feed::messagesObtained, this, &FeedDownloader::oneFeedUpdateFinished);
 
   m_feedsUpdated++;
   m_feedsUpdating--;
 
+  // Now make sure, that messages are actually stored to SQL in a locked state.
+
+  qDebug().nospace() << "Saving messages of feed "
+                     << feed->customId() << " in thread: \'"
+                     << QThread::currentThreadId() << "\'.";
+
+  m_msgUpdateMutex->lock();
+  int updated_messages = messages.isEmpty() ? 0 : feed->updateMessages(messages);
+  m_msgUpdateMutex->unlock();
+
   if (updated_messages > 0) {
     m_results.appendUpdatedFeed(QPair<QString,int>(feed->title(), updated_messages));
   }

src/core/feeddownloader.h

@@ -22,6 +22,8 @@
 
 #include <QPair>
 
+#include "core/message.h"
+
 
 class Feed;
 
@@ -70,7 +72,7 @@ class FeedDownloader : public QObject {
     void stopRunningUpdate();
 
   private slots:
-    void oneFeedUpdateFinished(int updated_messages);
+    void oneFeedUpdateFinished(const QList<Message> &messages);
 
   signals:
     // Emitted if feed updates started.
@@ -90,6 +92,7 @@ class FeedDownloader : public QObject {
     void finalizeUpdate();
 
     FeedDownloadResults m_results;
+    QMutex *m_msgUpdateMutex;
 
     int m_feedsUpdated;
     int m_feedsToUpdate;

src/main.cpp

@@ -47,9 +47,7 @@ int main(int argc, char *argv[]) {
   QObject::tr("LANG_AUTHOR");
 
   // Ensure that ini format is used as application settings storage on Mac OS.
-#ifdef Q_OS_MAC
   QSettings::setDefaultFormat(QSettings::IniFormat);
-#endif
 
   // Setup debug output system.
   qInstallMessageHandler(Debugging::debugHandler);
@@ -65,6 +63,7 @@ int main(int argc, char *argv[]) {
   }
 
   // Register needed metatypes.
+  qRegisterMetaType<QList<Message> >("QList<Message>");
   qRegisterMetaType<QList<RootItem*> >("QList<RootItem*>");
 
   // Add an extra path for non-system icon themes and set current icon theme
@@ -114,7 +113,7 @@ int main(int argc, char *argv[]) {
   qApp->mainForm()->tabWidget()->feedMessageViewer()->feedsView()->loadAllExpandStates();
 
   // Setup single-instance behavior.
-  QObject::connect(&application, SIGNAL(messageReceived(QString)), &application, SLOT(processExecutionMessage(QString)));
+  QObject::connect(&application, &Application::messageReceived, &application, &Application::processExecutionMessage);
 
   if (qApp->isFirstRun() || qApp->isFirstRun(APP_VERSION)) {
     qApp->showGuiMessage(QSL(APP_NAME), QObject::tr("Welcome to %1.\n\nPlease, check NEW stuff included in this\n"

src/miscellaneous/application.cpp

@@ -42,7 +42,7 @@
 
 Application::Application(const QString &id, int &argc, char **argv)
   : QtSingleApplication(id, argc, argv),
-    m_updateFeedsLock(nullptr), m_updateMessagesLock(nullptr), m_feedServices(QList<ServiceEntryPoint*>()), m_userActions(QList<QAction*>()), m_mainForm(nullptr),
+    m_updateFeedsLock(nullptr), m_feedServices(QList<ServiceEntryPoint*>()), m_userActions(QList<QAction*>()), m_mainForm(nullptr),
     m_trayIcon(nullptr), m_settings(nullptr), m_system(nullptr), m_skins(nullptr),
     m_localization(nullptr), m_icons(nullptr), m_database(nullptr), m_downloadManager(nullptr) {
   connect(this, SIGNAL(aboutToQuit()), this, SLOT(onAboutToQuit()));
@@ -127,16 +127,6 @@ Mutex *Application::feedUpdateLock() {
   return m_updateFeedsLock.data();
 }
 
-Mutex *Application::messageUpdateLock() {
-  if (m_updateMessagesLock.isNull()) {
-    // NOTE: Cannot use parent hierarchy because this method can be usually called
-    // from any thread.
-    m_updateMessagesLock.reset(new Mutex());
-  }
-
-  return m_updateMessagesLock.data();
-}
-
 void Application::backupDatabaseSettings(bool backup_database, bool backup_settings,
                                          const QString &target_path, const QString &backup_name) {
   if (!QFileInfo(target_path).isWritable()) {

src/miscellaneous/application.h

@@ -113,7 +113,6 @@ class Application : public QtSingleApplication {
 
     // Access to application-wide close lock.
     Mutex *feedUpdateLock();
-    Mutex *messageUpdateLock();
 
     inline FormMain *mainForm() {
       return m_mainForm;
@@ -187,7 +186,6 @@ class Application : public QtSingleApplication {
     // tries to lock the lock for writing), then no other
     // action will be allowed to lock for reading.
     QScopedPointer<Mutex> m_updateFeedsLock;
-    QScopedPointer<Mutex> m_updateMessagesLock;
 
     QList<ServiceEntryPoint*> m_feedServices;
     QList<QAction*> m_userActions;

src/miscellaneous/iconfactory.cpp

@@ -101,7 +101,9 @@ void IconFactory::loadCurrentIconTheme() {
 
   // Display list of installed themes.
   qDebug("Installed icon themes are: %s.",
-         qPrintable(QStringList(installed_themes).replaceInStrings(QRegExp(QSL("^|$")), QSL("\'")).join(QSL(", "))));
+         qPrintable(QStringList(installed_themes)
+                    .replaceInStrings(QRegExp(QSL("^|$")), QSL("\'"))
+                    .replaceInStrings(QRegExp(QSL("^\\'$")), QSL("\'\'")).join(QSL(", "))));
 
   if (installed_themes.contains(theme_name_from_settings)) {
     // Desired icon theme is installed and can be loaded.
@@ -111,8 +113,8 @@ void IconFactory::loadCurrentIconTheme() {
   else {
     // Desired icon theme is not currently available.
     // Install "default" icon theme instead.
-    qDebug("Icon theme '%s' cannot be loaded because it is not installed. No icon theme (or default icon theme) is loaded now.",
+    qWarning("Icon theme '%s' cannot be loaded because it is not installed. No icon theme (or default icon theme) is loaded now.",
-           qPrintable(theme_name_from_settings));
+             qPrintable(theme_name_from_settings));
     QIcon::setThemeName(APP_NO_THEME);
   }
 }

src/miscellaneous/localization.cpp

@@ -44,11 +44,13 @@ void Localization::loadActiveLanguage() {
   qDebug("Starting to load active localization. Desired localization is '%s'.", qPrintable(desired_localization));
 
   if (app_translator->load(QLocale(desired_localization), "rssguard", QSL("-"), APP_LANG_PATH)) {
+    const QString real_loaded_locale = app_translator->translate("QObject", "LANG_ABBREV");
+
     Application::installTranslator(app_translator);
     qDebug("Application localization '%s' loaded successfully, specifically sublocalization '%s' was loaded.",
            qPrintable(desired_localization),
-           qPrintable(app_translator->translate("QObject", "LANG_ABBREV")));
+           qPrintable(real_loaded_locale));
-    desired_localization = app_translator->translate("QObject", "LANG_ABBREV");
+    desired_localization = real_loaded_locale;
   }
   else {
     qWarning("Application localization '%s' was not loaded. Loading '%s' instead.",

src/miscellaneous/skinfactory.cpp

@@ -59,7 +59,7 @@ void SkinFactory::loadCurrentSkin() {
     }
   }
 
-  qFatal("Failed to load selected or default skin(s). Quitting!");
+  qFatal("Failed to load selected or default skin. Quitting!");
 }
 
 void SkinFactory::loadSkinFromData(const Skin &skin) {

src/services/abstract/feed.cpp

@@ -88,17 +88,6 @@ void Feed::setCountOfUnreadMessages(int count_unread_messages) {
   m_unreadCount = count_unread_messages;
 }
 
-int Feed::update() {
-  QList<Message> msgs = obtainNewMessages();
-
-  if (msgs.size() > 0) {
-    return updateMessages(msgs);
-  }
-  else {
-    return 0;
-  }
-}
-
 void Feed::setAutoUpdateInitialInterval(int auto_update_interval) {
   // If new initial auto-update interval is set, then
   // we should reset time that remains to the next auto-update.
@@ -134,9 +123,13 @@ void Feed::updateCounts(bool including_total_count) {
 }
 
 void Feed::run() {
-  qDebug().nospace() << "Updating feed " << customId() << " in thread: \'" << QThread::currentThreadId() << "\'.";
+  qDebug().nospace() << "Downloading new messages for feed "
+                     << customId() << " in thread: \'"
+                     << QThread::currentThreadId() << "\'.";
 
-  emit updated(update());
+  QList<Message> msgs = obtainNewMessages();
+
+  emit messagesObtained(msgs);
 }
 
 int Feed::updateMessages(const QList<Message> &messages) {
@@ -144,13 +137,6 @@ int Feed::updateMessages(const QList<Message> &messages) {
   int account_id = getParentServiceRoot()->accountId();
   bool anything_updated = false;
   bool ok;
-
-  // MySQL seems to be more error prone with transactions when called
-  // from more threads in the same time. SQLite does not have that limitation.
-  if (qApp->database()->activeDatabaseDriver() == DatabaseFactory::MYSQL) {
-    qApp->messageUpdateLock()->lock();
-  }
-
   QSqlDatabase database = qApp->database()->connection(metaObject()->className(), DatabaseFactory::FromSettings);
   int updated_messages = DatabaseQueries::updateMessages(database, messages, custom_id, account_id, url(),
                                                          &anything_updated, &ok);
@@ -176,9 +162,5 @@ int Feed::updateMessages(const QList<Message> &messages) {
     getParentServiceRoot()->itemChanged(items_to_update);
   }
 
-  if (qApp->database()->activeDatabaseDriver() == DatabaseFactory::MYSQL) {
-    qApp->messageUpdateLock()->unlock();
-  }
-
   return updated_messages;
 }

src/services/abstract/feed.h

@@ -61,13 +61,6 @@ class Feed : public RootItem, public QRunnable {
     void setCountOfAllMessages(int count_all_messages);
     void setCountOfUnreadMessages(int count_unread_messages);
 
-    // Performs synchronous update and returns number of newly updated messages.
-    // NOTE: This is called from worker thread, not from main UI thread.
-    // NOTE: This should COMPLETELY download ALL messages from online source
-    // into locale "Messages" table, INCLUDING contents (or excerpts) of those
-    // messages.
-    int update();
-
     QVariant data(int column, int role) const;
 
     int autoUpdateInitialInterval() const;
@@ -95,19 +88,18 @@ class Feed : public RootItem, public QRunnable {
       m_url = url;
     }
 
+    int updateMessages(const QList<Message> &messages);
     void updateCounts(bool including_total_count);
 
     // Runs update in thread (thread pooled).
     void run();
 
-  protected:
+  private:
+    // Performs synchronous obtaining of new messages for this feed.
     virtual QList<Message> obtainNewMessages() = 0;
 
-  private:
-    int updateMessages(const QList<Message> &messages);
-
   signals:
-    void updated(int updated_messages);
+    void messagesObtained(QList<Message> messages);
 
   private:
     QString m_url;