Merge pull request #11307 from Chocobo1/session_conf

Clean up Session class configure routines

src/base/bittorrent/session.cpp

@@ -30,7 +30,6 @@
 #include "session.h"
 
 #include <algorithm>
-#include <cstdlib>
 #include <queue>
 #include <string>
 #include <utility>
@@ -42,8 +41,10 @@
 
 #include <QDebug>
 #include <QDir>
+#include <QFile>
 #include <QHostAddress>
 #include <QNetworkAddressEntry>
+#include <QNetworkConfigurationManager>
 #include <QNetworkInterface>
 #include <QRegularExpression>
 #include <QString>
@@ -243,9 +244,6 @@ Session *Session::m_instance = nullptr;
 
 Session::Session(QObject *parent)
     : QObject(parent)
-    , m_deferredConfigureScheduled(false)
-    , m_IPFilteringChanged(false)
-    , m_listenInterfaceChanged(true)
     , m_isDHTEnabled(BITTORRENT_SESSION_KEY("DHTEnabled"), true)
     , m_isLSDEnabled(BITTORRENT_SESSION_KEY("LSDEnabled"), true)
     , m_isPeXEnabled(BITTORRENT_SESSION_KEY("PeXEnabled"), true)
@@ -346,10 +344,14 @@ Session::Session(QObject *parent)
                             return tmp;
                         }
                  )
-    , m_wasPexEnabled(m_isPeXEnabled)
-    , m_numResumeData(0)
-    , m_extraLimit(0)
-    , m_recentErroredTorrentsTimer(new QTimer(this))
+    , m_resumeFolderLock {new QFile {this}}
+    , m_refreshTimer {new QTimer {this}}
+    , m_seedingLimitTimer {new QTimer {this}}
+    , m_resumeDataTimer {new QTimer {this}}
+    , m_statistics {new Statistics {this}}
+    , m_ioThread {new QThread {this}}
+    , m_recentErroredTorrentsTimer {new QTimer {this}}
+    , m_networkManager {new QNetworkConfigurationManager {this}}
 {
     if (port() < 0)
         m_port = Utils::Random::rand(1024, 65535);
@@ -358,97 +360,18 @@ Session::Session(QObject *parent)
 
     m_recentErroredTorrentsTimer->setSingleShot(true);
     m_recentErroredTorrentsTimer->setInterval(1000);
-    connect(m_recentErroredTorrentsTimer, &QTimer::timeout, this, [this]() { m_recentErroredTorrents.clear(); });
+    connect(m_recentErroredTorrentsTimer, &QTimer::timeout
+        , this, [this]() { m_recentErroredTorrents.clear(); });
 
-    m_seedingLimitTimer = new QTimer(this);
     m_seedingLimitTimer->setInterval(10000);
     connect(m_seedingLimitTimer, &QTimer::timeout, this, &Session::processShareLimits);
 
-    // Set severity level of libtorrent session
-    const LTAlertCategory alertMask = lt::alert::error_notification
-                    | lt::alert::peer_notification
-                    | lt::alert::port_mapping_notification
-                    | lt::alert::storage_notification
-                    | lt::alert::tracker_notification
-                    | lt::alert::status_notification
-                    | lt::alert::ip_block_notification
-                    | lt::alert::performance_warning
-                    | lt::alert::file_progress_notification;
-
-    const std::string peerId = lt::generate_fingerprint(PEER_ID, QBT_VERSION_MAJOR, QBT_VERSION_MINOR, QBT_VERSION_BUGFIX, QBT_VERSION_BUILD);
-    lt::settings_pack pack;
-    pack.set_int(lt::settings_pack::alert_mask, alertMask);
-    pack.set_str(lt::settings_pack::peer_fingerprint, peerId);
-    pack.set_bool(lt::settings_pack::listen_system_port_fallback, false);
-    pack.set_str(lt::settings_pack::user_agent, USER_AGENT);
-    pack.set_bool(lt::settings_pack::use_dht_as_fallback, false);
-    // Speed up exit
-    pack.set_int(lt::settings_pack::stop_tracker_timeout, 1);
-    pack.set_int(lt::settings_pack::auto_scrape_interval, 1200); // 20 minutes
-    pack.set_int(lt::settings_pack::auto_scrape_min_interval, 900); // 15 minutes
-    pack.set_int(lt::settings_pack::connection_speed, 20); // default is 10
-    pack.set_bool(lt::settings_pack::no_connect_privileged_ports, false);
-    // libtorrent 1.1 enables UPnP & NAT-PMP by default
-    // turn them off before `lt::session` ctor to avoid split second effects
-    pack.set_bool(lt::settings_pack::enable_upnp, false);
-    pack.set_bool(lt::settings_pack::enable_natpmp, false);
-    pack.set_bool(lt::settings_pack::upnp_ignore_nonrouters, true);
-
-#if (LIBTORRENT_VERSION_NUM < 10200)
-    // Disable support for SSL torrents for now
-    pack.set_int(lt::settings_pack::ssl_listen, 0);
-    // To prevent ISPs from blocking seeding
-    pack.set_bool(lt::settings_pack::lazy_bitfields, true);
-    // Disk cache pool is rarely tested in libtorrent and doesn't free buffers
-    // Soon to be deprecated there
-    // More info: https://github.com/arvidn/libtorrent/issues/2251
-    pack.set_bool(lt::settings_pack::use_disk_cache_pool, false);
-#endif
-
-    configure(pack);
-
-    m_nativeSession = new lt::session {pack, LTSessionFlags {0}};
-    m_nativeSession->set_alert_notify([this]()
-    {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
-        QMetaObject::invokeMethod(this, &Session::readAlerts, Qt::QueuedConnection);
-#else
-        QMetaObject::invokeMethod(this, "readAlerts", Qt::QueuedConnection);
-#endif
-    });
-
-    configurePeerClasses();
-
-    // Enabling plugins
-    //m_nativeSession->add_extension(&lt::create_metadata_plugin);
-    m_nativeSession->add_extension(&lt::create_ut_metadata_plugin);
-    if (isPeXEnabled())
-        m_nativeSession->add_extension(&lt::create_ut_pex_plugin);
-    m_nativeSession->add_extension(&lt::create_smart_ban_plugin);
-
-    LogMsg(tr("Peer ID: ") + QString::fromStdString(peerId));
-    LogMsg(tr("HTTP User-Agent is '%1'").arg(USER_AGENT));
-    LogMsg(tr("DHT support [%1]").arg(isDHTEnabled() ? tr("ON") : tr("OFF")), Log::INFO);
-    LogMsg(tr("Local Peer Discovery support [%1]").arg(isLSDEnabled() ? tr("ON") : tr("OFF")), Log::INFO);
-    LogMsg(tr("PeX support [%1]").arg(isPeXEnabled() ? tr("ON") : tr("OFF")), Log::INFO);
-    LogMsg(tr("Anonymous mode [%1]").arg(isAnonymousModeEnabled() ? tr("ON") : tr("OFF")), Log::INFO);
-    LogMsg(tr("Encryption support [%1]").arg((encryption() == 0) ? tr("ON") :
-        ((encryption() == 1) ? tr("FORCED") : tr("OFF"))), Log::INFO);
+    initializeNativeSession();
+    configureComponents();
 
     if (isBandwidthSchedulerEnabled())
         enableBandwidthScheduler();
 
-    if (isIPFilteringEnabled()) {
-        // Manually banned IPs are handled in that function too(in the slots)
-        enableIPFilter();
-    }
-    else {
-        // Add the banned IPs
-        lt::ip_filter filter;
-        processBannedIPs(filter);
-        m_nativeSession->set_ip_filter(filter);
-    }
-
     m_categories = map_cast(m_storedCategories);
     if (isSubcategoriesEnabled()) {
         // if subcategories support changed manually
@@ -458,35 +381,31 @@ Session::Session(QObject *parent)
 
     m_tags = QSet<QString>::fromList(m_storedTags.value());
 
-    m_refreshTimer = new QTimer(this);
     m_refreshTimer->setInterval(refreshInterval());
     connect(m_refreshTimer, &QTimer::timeout, this, &Session::refresh);
     m_refreshTimer->start();
 
-    m_statistics = new Statistics(this);
-
     updateSeedingLimitTimer();
     populateAdditionalTrackers();
 
     enableTracker(isTrackerEnabled());
 
-    connect(Net::ProxyConfigurationManager::instance(), &Net::ProxyConfigurationManager::proxyConfigurationChanged
+    connect(Net::ProxyConfigurationManager::instance()
+        , &Net::ProxyConfigurationManager::proxyConfigurationChanged
         , this, &Session::configureDeferred);
 
     // Network configuration monitor
-    connect(&m_networkManager, &QNetworkConfigurationManager::onlineStateChanged, this, &Session::networkOnlineStateChanged);
-    connect(&m_networkManager, &QNetworkConfigurationManager::configurationAdded, this, &Session::networkConfigurationChange);
-    connect(&m_networkManager, &QNetworkConfigurationManager::configurationRemoved, this, &Session::networkConfigurationChange);
-    connect(&m_networkManager, &QNetworkConfigurationManager::configurationChanged, this, &Session::networkConfigurationChange);
+    connect(m_networkManager, &QNetworkConfigurationManager::onlineStateChanged, this, &Session::networkOnlineStateChanged);
+    connect(m_networkManager, &QNetworkConfigurationManager::configurationAdded, this, &Session::networkConfigurationChange);
+    connect(m_networkManager, &QNetworkConfigurationManager::configurationRemoved, this, &Session::networkConfigurationChange);
+    connect(m_networkManager, &QNetworkConfigurationManager::configurationChanged, this, &Session::networkConfigurationChange);
 
-    m_ioThread = new QThread(this);
     m_resumeDataSavingManager = new ResumeDataSavingManager {m_resumeFolderPath};
     m_resumeDataSavingManager->moveToThread(m_ioThread);
     connect(m_ioThread, &QThread::finished, m_resumeDataSavingManager, &QObject::deleteLater);
     m_ioThread->start();
 
     // Regular saving of fastresume data
-    m_resumeDataTimer = new QTimer(this);
     connect(m_resumeDataTimer, &QTimer::timeout, this, [this]() { generateResumeData(); });
     const uint saveInterval = saveResumeDataInterval();
     if (saveInterval > 0) {
@@ -498,8 +417,6 @@ Session::Session(QObject *parent)
     new PortForwarderImpl {m_nativeSession};
 
     initMetrics();
-
-    qDebug("* BitTorrent Session constructed");
 }
 
 bool Session::isDHTEnabled() const
@@ -667,7 +584,7 @@ QStringList Session::expandCategory(const QString &category)
     return result;
 }
 
-const QStringMap &Session::categories() const
+QStringMap Session::categories() const
 {
     return m_categories;
 }
@@ -948,8 +865,8 @@ Session::~Session()
     m_ioThread->quit();
     m_ioThread->wait();
 
-    m_resumeFolderLock.close();
-    m_resumeFolderLock.remove();
+    m_resumeFolderLock->close();
+    m_resumeFolderLock->remove();
 }
 
 void Session::initInstance()
@@ -987,25 +904,102 @@ void Session::applyBandwidthLimits()
         m_nativeSession->apply_settings(settingsPack);
 }
 
-// Set BitTorrent session configuration
 void Session::configure()
 {
-    qDebug("Configuring session");
     lt::settings_pack settingsPack = m_nativeSession->get_settings();
-    configure(settingsPack);
+    loadLTSettings(settingsPack);
     m_nativeSession->apply_settings(settingsPack);
+
+    configureComponents();
+
+    m_deferredConfigureScheduled = false;
+}
+
+void Session::configureComponents()
+{
+    // This function contains components/actions that:
+    // 1. Need to be setup at start up
+    // 2. When deferred configure is called
+
     configurePeerClasses();
 
-    if (m_IPFilteringChanged) {
+    if (!m_IPFilteringConfigured) {
         if (isIPFilteringEnabled())
             enableIPFilter();
         else
             disableIPFilter();
-        m_IPFilteringChanged = false;
+        m_IPFilteringConfigured = true;
+    }
 }
 
-    m_deferredConfigureScheduled = false;
-    qDebug("Session configured");
+void Session::initializeNativeSession()
+{
+    const LTAlertCategory alertMask = lt::alert::error_notification
+        | lt::alert::file_progress_notification
+        | lt::alert::ip_block_notification
+        | lt::alert::peer_notification
+        | lt::alert::performance_warning
+        | lt::alert::port_mapping_notification
+        | lt::alert::status_notification
+        | lt::alert::storage_notification
+        | lt::alert::tracker_notification;
+    const std::string peerId = lt::generate_fingerprint(PEER_ID, QBT_VERSION_MAJOR, QBT_VERSION_MINOR, QBT_VERSION_BUGFIX, QBT_VERSION_BUILD);
+
+    lt::settings_pack pack;
+    pack.set_int(lt::settings_pack::alert_mask, alertMask);
+    pack.set_str(lt::settings_pack::peer_fingerprint, peerId);
+    pack.set_bool(lt::settings_pack::listen_system_port_fallback, false);
+    pack.set_str(lt::settings_pack::user_agent, USER_AGENT);
+    pack.set_bool(lt::settings_pack::use_dht_as_fallback, false);
+    // Speed up exit
+    pack.set_int(lt::settings_pack::stop_tracker_timeout, 1);
+    pack.set_int(lt::settings_pack::auto_scrape_interval, 1200); // 20 minutes
+    pack.set_int(lt::settings_pack::auto_scrape_min_interval, 900); // 15 minutes
+    pack.set_int(lt::settings_pack::connection_speed, 20); // default is 10
+    pack.set_bool(lt::settings_pack::no_connect_privileged_ports, false);
+    // libtorrent 1.1 enables UPnP & NAT-PMP by default
+    // turn them off before `lt::session` ctor to avoid split second effects
+    pack.set_bool(lt::settings_pack::enable_upnp, false);
+    pack.set_bool(lt::settings_pack::enable_natpmp, false);
+    pack.set_bool(lt::settings_pack::upnp_ignore_nonrouters, true);
+
+#if (LIBTORRENT_VERSION_NUM < 10200)
+    // Disable support for SSL torrents for now
+    pack.set_int(lt::settings_pack::ssl_listen, 0);
+    // To prevent ISPs from blocking seeding
+    pack.set_bool(lt::settings_pack::lazy_bitfields, true);
+    // Disk cache pool is rarely tested in libtorrent and doesn't free buffers
+    // Soon to be deprecated there
+    // More info: https://github.com/arvidn/libtorrent/issues/2251
+    pack.set_bool(lt::settings_pack::use_disk_cache_pool, false);
+#endif
+
+    loadLTSettings(pack);
+    m_nativeSession = new lt::session {pack, LTSessionFlags {0}};
+
+    LogMsg(tr("Peer ID: ") + QString::fromStdString(peerId));
+    LogMsg(tr("HTTP User-Agent is '%1'").arg(USER_AGENT));
+    LogMsg(tr("DHT support [%1]").arg(isDHTEnabled() ? tr("ON") : tr("OFF")), Log::INFO);
+    LogMsg(tr("Local Peer Discovery support [%1]").arg(isLSDEnabled() ? tr("ON") : tr("OFF")), Log::INFO);
+    LogMsg(tr("PeX support [%1]").arg(isPeXEnabled() ? tr("ON") : tr("OFF")), Log::INFO);
+    LogMsg(tr("Anonymous mode [%1]").arg(isAnonymousModeEnabled() ? tr("ON") : tr("OFF")), Log::INFO);
+    LogMsg(tr("Encryption support [%1]").arg((encryption() == 0) ? tr("ON") :
+        ((encryption() == 1) ? tr("FORCED") : tr("OFF"))), Log::INFO);
+
+    m_nativeSession->set_alert_notify([this]()
+    {
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
+        QMetaObject::invokeMethod(this, &Session::readAlerts, Qt::QueuedConnection);
+#else
+        QMetaObject::invokeMethod(this, "readAlerts", Qt::QueuedConnection);
+#endif
+    });
+
+    // Enabling plugins
+    m_nativeSession->add_extension(&lt::create_smart_ban_plugin);
+    m_nativeSession->add_extension(&lt::create_ut_metadata_plugin);
+    if (isPeXEnabled())
+        m_nativeSession->add_extension(&lt::create_ut_pex_plugin);
 }
 
 void Session::processBannedIPs(lt::ip_filter &filter)
@@ -1117,7 +1111,7 @@ void Session::initMetrics()
     Q_ASSERT(m_metricIndices.disk.diskJobTime >= 0);
 }
 
-void Session::configure(lt::settings_pack &settingsPack)
+void Session::loadLTSettings(lt::settings_pack &settingsPack)
 {
     // from libtorrent doc:
     // It will not take affect until the listen_interfaces settings is updated
@@ -1126,7 +1120,7 @@ void Session::configure(lt::settings_pack &settingsPack)
 #ifdef Q_OS_WIN
     QString chosenIP;
 #endif
-    if (m_listenInterfaceChanged) {
+    if (!m_listenInterfaceConfigured) {
         const int port = useRandomPort() ? 0 : this->port();
         if (port > 0)  // user specified port
             settingsPack.set_int(lt::settings_pack::max_retry_port_bind, 0);
@@ -1182,7 +1176,7 @@ void Session::configure(lt::settings_pack &settingsPack)
         settingsPack.set_str(lt::settings_pack::outgoing_interfaces, networkInterface().toStdString());
 #endif // Q_OS_WIN
 
-        m_listenInterfaceChanged = false;
+        m_listenInterfaceConfigured = true;
     }
 
     applyBandwidthLimits(settingsPack);
@@ -2190,8 +2184,6 @@ void Session::generateResumeData(const bool final)
 // Called on exit
 void Session::saveResumeData()
 {
-    qDebug("Saving resume data...");
-
     // Pause session
     m_nativeSession->pause();
 
@@ -2200,14 +2192,14 @@ void Session::saveResumeData()
     generateResumeData(true);
 
     while (m_numResumeData > 0) {
-        std::vector<lt::alert *> alerts;
-        getPendingAlerts(alerts, 30 * 1000);
+        const std::vector<lt::alert *> alerts = getPendingAlerts(lt::seconds(30));
         if (alerts.empty()) {
-            fprintf(stderr, " aborting with %d outstanding torrents to save resume data for\n", m_numResumeData);
+            LogMsg(tr("Error: Aborted saving resume data for %1 outstanding torrents.").arg(QString::number(m_numResumeData))
+                , Log::CRITICAL);
             break;
         }
 
-        for (const auto a : alerts) {
+        for (const lt::alert *a : alerts) {
             switch (a->type()) {
             case lt::save_resume_data_failed_alert::alert_type:
             case lt::save_resume_data_alert::alert_type:
@@ -2377,7 +2369,7 @@ QStringList Session::getListeningIPs() const
 // the BitTorrent session will listen to
 void Session::configureListeningInterface()
 {
-    m_listenInterfaceChanged = true;
+    m_listenInterfaceConfigured = false;
     configureDeferred();
 }
 
@@ -2703,7 +2695,7 @@ void Session::setIPFilteringEnabled(const bool enabled)
 {
     if (enabled != m_isIPFilteringEnabled) {
         m_isIPFilteringEnabled = enabled;
-        m_IPFilteringChanged = true;
+        m_IPFilteringConfigured = false;
         configureDeferred();
     }
 }
@@ -2718,7 +2710,7 @@ void Session::setIPFilterFile(QString path)
     path = Utils::Fs::toUniformPath(path);
     if (path != IPFilterFile()) {
         m_IPFilterFile = path;
-        m_IPFilteringChanged = true;
+        m_IPFilteringConfigured = false;
         configureDeferred();
     }
 }
@@ -2752,7 +2744,7 @@ void Session::setBannedIPs(const QStringList &newList)
     // also here we have to recreate filter list including 3rd party ban file
     // and install it again into m_session
     m_bannedIPs = filteredList;
-    m_IPFilteringChanged = true;
+    m_IPFilteringConfigured = false;
     configureDeferred();
 }
 
@@ -3561,8 +3553,8 @@ void Session::initResumeFolder()
     m_resumeFolderPath = Utils::Fs::expandPathAbs(specialFolderLocation(SpecialFolder::Data) + RESUME_FOLDER);
     const QDir resumeFolderDir(m_resumeFolderPath);
     if (resumeFolderDir.exists() || resumeFolderDir.mkpath(resumeFolderDir.absolutePath())) {
-        m_resumeFolderLock.setFileName(resumeFolderDir.absoluteFilePath("session.lock"));
-        if (!m_resumeFolderLock.open(QFile::WriteOnly)) {
+        m_resumeFolderLock->setFileName(resumeFolderDir.absoluteFilePath("session.lock"));
+        if (!m_resumeFolderLock->open(QFile::WriteOnly)) {
             throw RuntimeError {tr("Cannot write to torrent resume folder.")};
         }
     }
@@ -3573,7 +3565,10 @@ void Session::initResumeFolder()
 
 void Session::configureDeferred()
 {
-    if (!m_deferredConfigureScheduled) {
+    if (m_deferredConfigureScheduled)
+        return;
+    m_deferredConfigureScheduled = true;
+
 #if (QT_VERSION >= QT_VERSION_CHECK(5, 10, 0))
     QMetaObject::invokeMethod(this
         , qOverload<>(&Session::configure)
@@ -3581,8 +3576,6 @@ void Session::configureDeferred()
 #else
     QMetaObject::invokeMethod(this, "configure", Qt::QueuedConnection);
 #endif
-        m_deferredConfigureScheduled = true;
-    }
 }
 
 // Enable IP Filtering
@@ -3816,13 +3809,14 @@ void Session::handleIPFilterError()
     emit IPFilterParsed(true, 0);
 }
 
-void Session::getPendingAlerts(std::vector<lt::alert *> &out, const ulong time)
+std::vector<lt::alert *> Session::getPendingAlerts(const lt::time_duration time) const
 {
-    Q_ASSERT(out.empty());
+    if (time > lt::time_duration::zero())
+        m_nativeSession->wait_for_alert(time);
 
-    if (time > 0)
-        m_nativeSession->wait_for_alert(lt::milliseconds(time));
-    m_nativeSession->pop_alerts(&out);
+    std::vector<lt::alert *> alerts;
+    m_nativeSession->pop_alerts(&alerts);
+    return alerts;
 }
 
 bool Session::isCreateTorrentSubfolder() const
@@ -3838,10 +3832,8 @@ void Session::setCreateTorrentSubfolder(const bool value)
 // Read alerts sent by the BitTorrent session
 void Session::readAlerts()
 {
-    std::vector<lt::alert *> alerts;
-    getPendingAlerts(alerts);
-
-    for (const auto a : alerts)
+    const std::vector<lt::alert *> alerts = getPendingAlerts();
+    for (const lt::alert *a : alerts)
         handleAlert(a);
 }
 

src/base/bittorrent/session.h

@@ -34,9 +34,7 @@
 
 #include <libtorrent/fwd.hpp>
 
-#include <QFile>
 #include <QHash>
-#include <QNetworkConfigurationManager>
 #include <QPointer>
 #include <QSet>
 #include <QVector>
@@ -48,16 +46,19 @@
 #include "sessionstatus.h"
 #include "torrentinfo.h"
 
-class QThread;
-class QTimer;
+class QFile;
+class QNetworkConfiguration;
+class QNetworkConfigurationManager;
 class QString;
 class QStringList;
+class QThread;
+class QTimer;
 class QUrl;
 
-class FilterParserThread;
 class BandwidthScheduler;
-class Statistics;
+class FilterParserThread;
 class ResumeDataSavingManager;
+class Statistics;
 
 // These values should remain unchanged when adding new items
 // so as not to break the existing user settings.
@@ -89,9 +90,9 @@ namespace Net
 namespace BitTorrent
 {
     class InfoHash;
+    class MagnetUri;
     class TorrentHandle;
     class Tracker;
-    class MagnetUri;
     class TrackerEntry;
     struct CreateTorrentParams;
 
@@ -102,6 +103,14 @@ namespace BitTorrent
     {
         Q_NAMESPACE
 
+        enum class BTProtocol : int
+        {
+            Both = 0,
+            TCP = 1,
+            UTP = 2
+        };
+        Q_ENUM_NS(BTProtocol)
+
         enum class ChokingAlgorithm : int
         {
             FixedSlots = 0,
@@ -109,14 +118,6 @@ namespace BitTorrent
         };
         Q_ENUM_NS(ChokingAlgorithm)
 
-        enum class SeedChokingAlgorithm : int
-        {
-            RoundRobin = 0,
-            FastestUpload = 1,
-            AntiLeech = 2
-        };
-        Q_ENUM_NS(SeedChokingAlgorithm)
-
         enum class MixedModeAlgorithm : int
         {
             TCP = 0,
@@ -124,13 +125,13 @@ namespace BitTorrent
         };
         Q_ENUM_NS(MixedModeAlgorithm)
 
-        enum class BTProtocol : int
+        enum class SeedChokingAlgorithm : int
         {
-            Both = 0,
-            TCP = 1,
-            UTP = 2
+            RoundRobin = 0,
+            FastestUpload = 1,
+            AntiLeech = 2
         };
-        Q_ENUM_NS(BTProtocol)
+        Q_ENUM_NS(SeedChokingAlgorithm)
     }
     using namespace SessionSettingsEnums;
 
@@ -200,7 +201,7 @@ namespace BitTorrent
         // returns category itself and all top level categories
         static QStringList expandCategory(const QString &category);
 
-        const QStringMap &categories() const;
+        QStringMap categories() const;
         QString categorySavePath(const QString &categoryName) const;
         bool addCategory(const QString &name, const QString &savePath = "");
         bool editCategory(const QString &name, const QString &savePath);
@@ -512,7 +513,9 @@ namespace BitTorrent
 
         // Session configuration
         Q_INVOKABLE void configure();
-        void configure(lt::settings_pack &settingsPack);
+        void configureComponents();
+        void initializeNativeSession();
+        void loadLTSettings(lt::settings_pack &settingsPack);
         void configurePeerClasses();
         void adjustLimits(lt::settings_pack &settingsPack);
         void applyBandwidthLimits(lt::settings_pack &settingsPack) const;
@@ -565,14 +568,14 @@ namespace BitTorrent
         void saveTorrentsQueue();
         void removeTorrentsQueue();
 
-        void getPendingAlerts(std::vector<lt::alert *> &out, ulong time = 0);
+        std::vector<lt::alert *> getPendingAlerts(lt::time_duration time = lt::time_duration::zero()) const;
 
         // BitTorrent
-        lt::session *m_nativeSession;
+        lt::session *m_nativeSession = nullptr;
 
-        bool m_deferredConfigureScheduled;
-        bool m_IPFilteringChanged;
-        bool m_listenInterfaceChanged; // optimization
+        bool m_deferredConfigureScheduled = false;
+        bool m_IPFilteringConfigured = false;
+        bool m_listenInterfaceConfigured = false;
 
         CachedSettingValue<bool> m_isDHTEnabled;
         CachedSettingValue<bool> m_isLSDEnabled;
@@ -662,26 +665,26 @@ namespace BitTorrent
         // Order is important. This needs to be declared after its CachedSettingsValue
         // counterpart, because it uses it for initialization in the constructor
         // initialization list.
-        const bool m_wasPexEnabled;
+        const bool m_wasPexEnabled = m_isPeXEnabled;
 
-        int m_numResumeData;
-        int m_extraLimit;
+        int m_numResumeData = 0;
+        int m_extraLimit = 0;
         QVector<BitTorrent::TrackerEntry> m_additionalTrackerList;
         QString m_resumeFolderPath;
-        QFile m_resumeFolderLock;
+        QFile *m_resumeFolderLock = nullptr;
 
-        QTimer *m_refreshTimer;
-        QTimer *m_seedingLimitTimer;
-        QTimer *m_resumeDataTimer;
-        Statistics *m_statistics;
+        QTimer *m_refreshTimer = nullptr;
+        QTimer *m_seedingLimitTimer = nullptr;
+        QTimer *m_resumeDataTimer = nullptr;
+        Statistics *m_statistics = nullptr;
         // IP filtering
         QPointer<FilterParserThread> m_filterParser;
         QPointer<BandwidthScheduler> m_bwScheduler;
         // Tracker
         QPointer<Tracker> m_tracker;
         // fastresume data writing thread
-        QThread *m_ioThread;
-        ResumeDataSavingManager *m_resumeDataSavingManager;
+        QThread *m_ioThread = nullptr;
+        ResumeDataSavingManager *m_resumeDataSavingManager = nullptr;
 
         QHash<InfoHash, TorrentInfo> m_loadedMetadata;
         QHash<InfoHash, TorrentHandle *> m_torrents;
@@ -693,7 +696,7 @@ namespace BitTorrent
 
         // I/O errored torrents
         QSet<InfoHash> m_recentErroredTorrents;
-        QTimer *m_recentErroredTorrentsTimer;
+        QTimer *m_recentErroredTorrentsTimer = nullptr;
 
         SessionMetricIndices m_metricIndices;
         lt::time_point m_statsLastTimestamp = lt::clock_type::now();
@@ -701,7 +704,7 @@ namespace BitTorrent
         SessionStatus m_status;
         CacheStatus m_cacheStatus;
 
-        QNetworkConfigurationManager m_networkManager;
+        QNetworkConfigurationManager *m_networkManager = nullptr;
 
         static Session *m_instance;
     };

src/webui/api/synccontroller.cpp

@@ -446,7 +446,7 @@ void SyncController::maindataAction()
     data["torrents"] = torrents;
 
     QVariantHash categories;
-    const auto &categoriesList = session->categories();
+    const QStringMap categoriesList = session->categories();
     for (auto it = categoriesList.cbegin(); it != categoriesList.cend(); ++it) {
         const QString &key = it.key();
         categories[key] = QVariantMap {

src/webui/api/torrentscontroller.cpp

@@ -1077,8 +1077,8 @@ void TorrentsController::removeCategoriesAction()
 void TorrentsController::categoriesAction()
 {
     QJsonObject categories;
-    const auto categoriesList = BitTorrent::Session::instance()->categories();
-    for (auto it = categoriesList.cbegin(); it != categoriesList.cend(); ++it) {
+    const QStringMap categoriesMap = BitTorrent::Session::instance()->categories();
+    for (auto it = categoriesMap.cbegin(); it != categoriesMap.cend(); ++it) {
         const auto &key = it.key();
         categories[key] = QJsonObject {
             {"name", key},