support very fast auto-fetch intervals

src/librssguard/core/feedsmodel.cpp

@@ -244,6 +244,7 @@ QList<ServiceRoot*> FeedsModel::serviceRoots() const {
 QList<Feed*> FeedsModel::feedsForScheduledUpdate(bool auto_update_now) {
   QList<Feed*> feeds_for_update;
   auto stf = m_rootItem->getSubTreeFeeds();
+  auto cur_date = QDateTime::currentDateTimeUtc();
 
   for (Feed* feed : qAsConst(stf)) {
     switch (feed->autoUpdateType()) {
@@ -260,7 +261,7 @@ QList<Feed*> FeedsModel::feedsForScheduledUpdate(bool auto_update_now) {
 
       case Feed::AutoUpdateType::SpecificAutoUpdate:
       default:
-        if (feed->lastUpdated().addSecs(feed->autoUpdateInterval()) < QDateTime::currentDateTimeUtc()) {
+        if (feed->lastUpdated().addSecs(feed->autoUpdateInterval()) < cur_date) {
           feeds_for_update.append(feed);
         }
 

src/librssguard/gui/settings/settingsfeedsmessages.cpp

@@ -75,6 +75,7 @@ SettingsFeedsMessages::SettingsFeedsMessages(Settings* settings, QWidget* parent
           &QComboBox::setEnabled);
 
   connect(m_ui->m_checkMessagesTimeFormat, &QCheckBox::toggled, this, &SettingsFeedsMessages::dirtifySettings);
+  connect(m_ui->m_cmbFastAutoUpdate, &QCheckBox::toggled, this, &SettingsFeedsMessages::dirtifySettings);
   connect(m_ui->m_checkMessagesTimeFormat, &QCheckBox::toggled, m_ui->m_cmbMessagesTimeFormat, &QComboBox::setEnabled);
 
   connect(m_ui->m_checkRemoveReadMessagesOnExit, &QCheckBox::toggled, this, &SettingsFeedsMessages::dirtifySettings);
@@ -241,6 +242,7 @@ void SettingsFeedsMessages::loadSettings() {
     ->setChecked(settings()->value(GROUP(Feeds), SETTING(Feeds::AutoUpdateOnlyUnfocused)).toBool());
   m_ui->m_spinAutoUpdateInterval->setValue(settings()->value(GROUP(Feeds), SETTING(Feeds::AutoUpdateInterval)).toInt());
   m_ui->m_spinFeedUpdateTimeout->setValue(settings()->value(GROUP(Feeds), SETTING(Feeds::UpdateTimeout)).toInt());
+  m_ui->m_cmbFastAutoUpdate->setChecked(settings()->value(GROUP(Feeds), SETTING(Feeds::FastAutoUpdate)).toBool());
   m_ui->m_checkUpdateAllFeedsOnStartup
     ->setChecked(settings()->value(GROUP(Feeds), SETTING(Feeds::FeedsUpdateOnStartup)).toBool());
   m_ui->m_spinStartupUpdateDelay
@@ -326,6 +328,7 @@ void SettingsFeedsMessages::saveSettings() {
   settings()->setValue(GROUP(Feeds), Feeds::AutoUpdateOnlyUnfocused, m_ui->m_checkAutoUpdateOnlyUnfocused->isChecked());
   settings()->setValue(GROUP(Feeds), Feeds::AutoUpdateInterval, m_ui->m_spinAutoUpdateInterval->value());
   settings()->setValue(GROUP(Feeds), Feeds::UpdateTimeout, m_ui->m_spinFeedUpdateTimeout->value());
+  settings()->setValue(GROUP(Feeds), Feeds::FastAutoUpdate, m_ui->m_cmbFastAutoUpdate->isChecked());
   settings()->setValue(GROUP(Feeds), Feeds::FeedsUpdateOnStartup, m_ui->m_checkUpdateAllFeedsOnStartup->isChecked());
   settings()->setValue(GROUP(Feeds), Feeds::FeedsUpdateStartupDelay, m_ui->m_spinStartupUpdateDelay->value());
   settings()->setValue(GROUP(Feeds), Feeds::CountFormat, m_ui->m_cmbCountsFeedList->currentText());

src/librssguard/gui/settings/settingsfeedsmessages.ui

@@ -80,7 +80,7 @@
          </property>
         </widget>
        </item>
-       <item row="3" column="0">
+       <item row="4" column="0">
         <widget class="QLabel" name="label_3">
          <property name="text">
           <string>Feed connection timeout</string>
@@ -90,7 +90,7 @@
          </property>
         </widget>
        </item>
-       <item row="3" column="1">
+       <item row="4" column="1">
         <widget class="QSpinBox" name="m_spinFeedUpdateTimeout">
          <property name="minimumSize">
           <size>
@@ -115,6 +115,13 @@
          </property>
         </widget>
        </item>
+       <item row="3" column="0" colspan="2">
+        <widget class="QCheckBox" name="m_cmbFastAutoUpdate">
+         <property name="text">
+          <string>Support very fast auto-fetching intervals (under 10 seconds)</string>
+         </property>
+        </widget>
+       </item>
       </layout>
      </widget>
      <widget class="QWidget" name="m_tabFeedsList">
@@ -619,6 +626,7 @@
   <tabstop>m_checkAutoUpdate</tabstop>
   <tabstop>m_spinAutoUpdateInterval</tabstop>
   <tabstop>m_checkAutoUpdateOnlyUnfocused</tabstop>
+  <tabstop>m_cmbFastAutoUpdate</tabstop>
   <tabstop>m_spinFeedUpdateTimeout</tabstop>
   <tabstop>m_spinHeightRowsFeeds</tabstop>
   <tabstop>m_btnChangeFeedListFont</tabstop>

src/librssguard/miscellaneous/feedreader.cpp

@@ -153,6 +153,7 @@ void FeedReader::updateAutoUpdateStatus() {
   // Restore global intervals.
   // NOTE: Specific per-feed interval are left intact.
   m_globalAutoUpdateInterval = qApp->settings()->value(GROUP(Feeds), SETTING(Feeds::AutoUpdateInterval)).toInt();
+  m_globalAutoUpdateFast = qApp->settings()->value(GROUP(Feeds), SETTING(Feeds::FastAutoUpdate)).toBool();
 
   if (m_lastAutoUpdate.isNull()) {
     m_lastAutoUpdate = QDateTime::currentDateTimeUtc();
@@ -162,12 +163,22 @@ void FeedReader::updateAutoUpdateStatus() {
   m_globalAutoUpdateOnlyUnfocused =
     qApp->settings()->value(GROUP(Feeds), SETTING(Feeds::AutoUpdateOnlyUnfocused)).toBool();
 
+  if (m_globalAutoUpdateFast) {
+    // NOTE: In "fast" mode, we set interval to 1 second.
+    // This might have some performance consequences.
+    m_autoUpdateTimer->setInterval(1000);
+    qDebugNN << LOGSEC_CORE
+             << "Enabling support for very small auto-fetching intervals. This might have performance consequences.";
+  }
+  else {
+    m_autoUpdateTimer->setInterval(AUTO_UPDATE_INTERVAL * 1000);
+  }
+
   // Start global auto-update timer if it is not running yet.
   // NOTE: The timer must run even if global auto-update
   // is not enabled because user can still enable auto-update
   // for individual feeds.
   if (!m_autoUpdateTimer->isActive()) {
-    m_autoUpdateTimer->setInterval(AUTO_UPDATE_INTERVAL * 1000);
     m_autoUpdateTimer->start();
     qDebugNN << LOGSEC_CORE << "Auto-download timer started with interval " << m_autoUpdateTimer->interval() << " ms.";
   }

src/librssguard/miscellaneous/feedreader.h

@@ -91,6 +91,7 @@ class RSSGUARD_DLLSPEC FeedReader : public QObject {
     // Auto-update stuff.
     QTimer* m_autoUpdateTimer;
     bool m_globalAutoUpdateEnabled{};
+    bool m_globalAutoUpdateFast{};
     bool m_globalAutoUpdateOnlyUnfocused{};
     int m_globalAutoUpdateInterval{}; // In seconds.
     QDateTime m_lastAutoUpdate;

src/librssguard/miscellaneous/settings.cpp

@@ -86,6 +86,9 @@ DVALUE(int) Feeds::AutoUpdateIntervalDef = DEFAULT_AUTO_UPDATE_INTERVAL;
 DKEY Feeds::AutoUpdateEnabled = "auto_update_enabled";
 DVALUE(bool) Feeds::AutoUpdateEnabledDef = false;
 
+DKEY Feeds::FastAutoUpdate = "auto_update_fast";
+DVALUE(bool) Feeds::FastAutoUpdateDef = false;
+
 DKEY Feeds::AutoUpdateOnlyUnfocused = "auto_update_only_unfocused";
 DVALUE(bool) Feeds::AutoUpdateOnlyUnfocusedDef = false;
 

src/librssguard/miscellaneous/settings.h

@@ -83,6 +83,9 @@ namespace Feeds {
   KEY AutoUpdateEnabled;
   VALUE(bool) AutoUpdateEnabledDef;
 
+  KEY FastAutoUpdate;
+  VALUE(bool) FastAutoUpdateDef;
+
   KEY AutoUpdateOnlyUnfocused;
   VALUE(bool) AutoUpdateOnlyUnfocusedDef;