Allow setting the number of maximum active checking torrents

This is to allow re-checking of multiple torrents simultaneously. This will benefit users who
have multiple disks or SSD.
Closes #15296.

Co-authored-by: Chocobo1 <Chocobo1@users.noreply.github.com>

src/base/bittorrent/session.cpp

@@ -450,6 +450,7 @@ Session::Session(QObject *parent)
     , m_networkInterfaceName(BITTORRENT_SESSION_KEY("InterfaceName"))
     , m_networkInterfaceAddress(BITTORRENT_SESSION_KEY("InterfaceAddress"))
     , m_encryption(BITTORRENT_SESSION_KEY("Encryption"), 0)
+    , m_maxActiveCheckingTorrents(BITTORRENT_SESSION_KEY("MaxActiveCheckingTorrents"), 1)
     , m_isProxyPeerConnectionsEnabled(BITTORRENT_SESSION_KEY("ProxyPeerConnections"), false)
     , m_chokingAlgorithm(BITTORRENT_SESSION_KEY("ChokingAlgorithm"), ChokingAlgorithm::FixedSlots
         , clampValue(ChokingAlgorithm::FixedSlots, ChokingAlgorithm::RateBased))
@@ -1287,6 +1288,8 @@ void Session::loadLTSettings(lt::settings_pack &settingsPack)
         settingsPack.set_int(lt::settings_pack::in_enc_policy, lt::settings_pack::pe_disabled);
     }
 
+    settingsPack.set_int(lt::settings_pack::active_checking, maxActiveCheckingTorrents());
+
     // proxy
     const auto proxyManager = Net::ProxyConfigurationManager::instance();
     const Net::ProxyConfiguration proxyConfig = proxyManager->proxyConfiguration();
@@ -2985,6 +2988,20 @@ void Session::setEncryption(const int state)
     }
 }
 
+int Session::maxActiveCheckingTorrents() const
+{
+    return m_maxActiveCheckingTorrents;
+}
+
+void Session::setMaxActiveCheckingTorrents(const int val)
+{
+    if (val == m_maxActiveCheckingTorrents)
+        return;
+
+    m_maxActiveCheckingTorrents = val;
+    configureDeferred();
+}
+
 bool Session::isProxyPeerConnectionsEnabled() const
 {
     return m_isProxyPeerConnectionsEnabled;

src/base/bittorrent/session.h

@@ -326,6 +326,8 @@ namespace BitTorrent
         void setNetworkInterfaceAddress(const QString &address);
         int encryption() const;
         void setEncryption(int state);
+        int maxActiveCheckingTorrents() const;
+        void setMaxActiveCheckingTorrents(int val);
         bool isProxyPeerConnectionsEnabled() const;
         void setProxyPeerConnectionsEnabled(bool enabled);
         ChokingAlgorithm chokingAlgorithm() const;
@@ -750,6 +752,7 @@ namespace BitTorrent
         CachedSettingValue<QString> m_networkInterfaceName;
         CachedSettingValue<QString> m_networkInterfaceAddress;
         CachedSettingValue<int> m_encryption;
+        CachedSettingValue<int> m_maxActiveCheckingTorrents;
         CachedSettingValue<bool> m_isProxyPeerConnectionsEnabled;
         CachedSettingValue<ChokingAlgorithm> m_chokingAlgorithm;
         CachedSettingValue<SeedChokingAlgorithm> m_seedChokingAlgorithm;

src/gui/optionsdialog.cpp

@@ -434,6 +434,7 @@ OptionsDialog::OptionsDialog(QWidget *parent)
     connect(m_ui->spinMaxUploadsPerTorrent, qSpinBoxValueChanged, this, &ThisType::enableApplyButton);
     connect(m_ui->checkDHT, &QAbstractButton::toggled, this, &ThisType::enableApplyButton);
     connect(m_ui->checkAnonymousMode, &QAbstractButton::toggled, this, &ThisType::enableApplyButton);
+    connect(m_ui->spinBoxMaxActiveCheckingTorrents, qSpinBoxValueChanged, this, &ThisType::enableApplyButton);
     connect(m_ui->checkPeX, &QAbstractButton::toggled, this, &ThisType::enableApplyButton);
     connect(m_ui->checkLSD, &QAbstractButton::toggled, this, &ThisType::enableApplyButton);
     connect(m_ui->comboEncryption, qComboBoxCurrentIndexChanged, this, &ThisType::enableApplyButton);
@@ -816,6 +817,7 @@ void OptionsDialog::saveOptions()
     session->setLSDEnabled(isLSDEnabled());
     session->setEncryption(getEncryptionSetting());
     session->setAnonymousModeEnabled(m_ui->checkAnonymousMode->isChecked());
+    session->setMaxActiveCheckingTorrents(m_ui->spinBoxMaxActiveCheckingTorrents->value());
     session->setAddTrackersEnabled(m_ui->checkEnableAddTrackers->isChecked());
     session->setAdditionalTrackers(m_ui->textTrackers->toPlainText());
     session->setGlobalMaxRatio(getMaxRatio());
@@ -1208,6 +1210,7 @@ void OptionsDialog::loadOptions()
     m_ui->checkLSD->setChecked(session->isLSDEnabled());
     m_ui->comboEncryption->setCurrentIndex(session->encryption());
     m_ui->checkAnonymousMode->setChecked(session->isAnonymousModeEnabled());
+    m_ui->spinBoxMaxActiveCheckingTorrents->setValue(session->maxActiveCheckingTorrents());
     m_ui->checkEnableAddTrackers->setChecked(session->isAddTrackersEnabled());
     m_ui->textTrackers->setPlainText(session->additionalTrackers());
 

src/gui/optionsdialog.ui

@@ -2377,6 +2377,43 @@ Disable encryption: Only connect to peers without protocol encryption</string>
               </layout>
              </widget>
             </item>
+            <item>
+             <layout class="QHBoxLayout" name="horizontalLayout_20">
+              <item>
+               <widget class="QLabel" name="labelMaxActiveCheckingTorrents">
+                <property name="text">
+                 <string>Maximum active checking torrents:</string>
+                </property>
+               </widget>
+              </item>
+              <item>
+               <widget class="QSpinBox" name="spinBoxMaxActiveCheckingTorrents">
+                <property name="specialValueText">
+                 <string notr="true">∞</string>
+                </property>
+                <property name="minimum">
+                 <number>-1</number>
+                </property>
+                <property name="maximum">
+                 <number>2147483647</number>
+                </property>
+               </widget>
+              </item>
+              <item>
+               <spacer name="horizontalSpacer_21">
+                <property name="orientation">
+                 <enum>Qt::Horizontal</enum>
+                </property>
+                <property name="sizeHint" stdset="0">
+                 <size>
+                  <width>40</width>
+                  <height>20</height>
+                 </size>
+                </property>
+               </spacer>
+              </item>
+             </layout>
+            </item>
             <item>
              <widget class="QGroupBox" name="checkEnableQueueing">
               <property name="title">

src/webui/api/appcontroller.cpp

@@ -210,6 +210,8 @@ void AppController::preferencesAction()
     data["lsd"] = session->isLSDEnabled();
     data["encryption"] = session->encryption();
     data["anonymous_mode"] = session->isAnonymousModeEnabled();
+    // Max active checking torrents
+    data["max_active_checking_torrents"] = session->maxActiveCheckingTorrents();
     // Torrent Queueing
     data["queueing_enabled"] = session->isQueueingSystemEnabled();
     data["max_active_downloads"] = session->maxActiveDownloads();
@@ -584,6 +586,9 @@ void AppController::setPreferencesAction()
         session->setEncryption(it.value().toInt());
     if (hasKey("anonymous_mode"))
         session->setAnonymousModeEnabled(it.value().toBool());
+    // Max active checking torrents
+    if (hasKey("max_active_checking_torrents"))
+        session->setMaxActiveCheckingTorrents(it.value().toInt());
     // Torrent Queueing
     if (hasKey("queueing_enabled"))
         session->setQueueingSystemEnabled(it.value().toBool());

src/webui/webapplication.h

@@ -44,7 +44,7 @@
 #include "base/utils/net.h"
 #include "base/utils/version.h"
 
-inline const Utils::Version<int, 3, 2> API_VERSION {2, 8, 8};
+inline const Utils::Version<int, 3, 2> API_VERSION {2, 8, 9};
 
 class APIController;
 class WebApplication;

src/webui/www/private/views/preferences.html

@@ -472,6 +472,11 @@
         </div>
     </fieldset>
 
+    <div class="formRow">
+        <label for="maxActiveCheckingTorrents">QBT_TR(Max active checking torrents:)QBT_TR[CONTEXT=OptionsDialog]</label>
+        <input type="number" id="maxActiveCheckingTorrents" style="width: 4em;" min="-1" />
+    </div>
+
     <fieldset class="settings">
         <legend>
             <input type="checkbox" id="queueing_checkbox" onclick="qBittorrent.Preferences.updateQueueingSystem();" />
@@ -1835,6 +1840,8 @@
                         $('encryption_select').getChildren('option')[encryption].setAttribute('selected', '');
                         $('anonymous_mode_checkbox').setProperty('checked', pref.anonymous_mode);
 
+                        $('maxActiveCheckingTorrents').setProperty('value', pref.max_active_checking_torrents);
+
                         // Torrent Queueing
                         $('queueing_checkbox').setProperty('checked', pref.queueing_enabled);
                         $('max_active_dl_value').setProperty('value', pref.max_active_downloads.toInt());
@@ -2184,6 +2191,8 @@
             settings.set('encryption', $('encryption_select').getSelected()[0].getProperty('value'));
             settings.set('anonymous_mode', $('anonymous_mode_checkbox').getProperty('checked'));
 
+            settings.set('max_active_checking_torrents', $('maxActiveCheckingTorrents').getProperty('value'));
+
             // Torrent Queueing
             settings.set('queueing_enabled', $('queueing_checkbox').getProperty('checked'));
             if ($('queueing_checkbox').getProperty('checked')) {