Migrate -prune setting from QSettings to settings.json

src/qt/bitcoin.cpp

@@ -344,7 +344,7 @@ void BitcoinApplication::parameterSetup()
 
 void BitcoinApplication::InitPruneSetting(int64_t prune_MiB)
 {
-    optionsModel->SetPruneTargetGB(PruneMiBtoGB(prune_MiB), true);
+    optionsModel->SetPruneTargetGB(PruneMiBtoGB(prune_MiB));
 }
 
 void BitcoinApplication::requestInitialize()

src/qt/optionsmodel.cpp

@@ -45,6 +45,8 @@ static const char* SettingName(OptionsModel::OptionID option)
     case OptionsModel::MapPortNatpmp: return "natpmp";
     case OptionsModel::Listen: return "listen";
     case OptionsModel::Server: return "server";
+    case OptionsModel::PruneSize: return "prune";
+    case OptionsModel::Prune: return "prune";
     case OptionsModel::ProxyIP: return "proxy";
     case OptionsModel::ProxyPort: return "proxy";
     case OptionsModel::ProxyUse: return "proxy";
@@ -60,7 +62,9 @@ static void UpdateRwSetting(interfaces::Node& node, OptionsModel::OptionID optio
 {
     if (value.isNum() &&
         (option == OptionsModel::DatabaseCache ||
-         option == OptionsModel::ThreadsScriptVerif)) {
+         option == OptionsModel::ThreadsScriptVerif ||
+         option == OptionsModel::Prune ||
+         option == OptionsModel::PruneSize)) {
         // Write certain old settings as strings, even though they are numbers,
         // because Bitcoin 22.x releases try to read these specific settings as
         // strings in addOverriddenOption() calls at startup, triggering
@@ -74,6 +78,36 @@ static void UpdateRwSetting(interfaces::Node& node, OptionsModel::OptionID optio
     }
 }
 
+//! Convert enabled/size values to bitcoin -prune setting.
+static util::SettingsValue PruneSetting(bool prune_enabled, int prune_size_gb)
+{
+    assert(!prune_enabled || prune_size_gb >= 1); // PruneSizeGB and ParsePruneSizeGB never return less
+    return prune_enabled ? PruneGBtoMiB(prune_size_gb) : 0;
+}
+
+//! Get pruning enabled value to show in GUI from bitcoin -prune setting.
+static bool PruneEnabled(const util::SettingsValue& prune_setting)
+{
+    // -prune=1 setting is manual pruning mode, so disabled for purposes of the gui
+    return SettingToInt(prune_setting, 0) > 1;
+}
+
+//! Get pruning size value to show in GUI from bitcoin -prune setting. If
+//! pruning is not enabled, just show default recommended pruning size (2GB).
+static int PruneSizeGB(const util::SettingsValue& prune_setting)
+{
+    int value = SettingToInt(prune_setting, 0);
+    return value > 1 ? PruneMiBtoGB(value) : DEFAULT_PRUNE_TARGET_GB;
+}
+
+//! Parse pruning size value provided by user in GUI or loaded from QSettings
+//! (windows registry key or qt .conf file). Smallest value that the GUI can
+//! display is 1 GB, so round up if anything less is parsed.
+static int ParsePruneSizeGB(const QVariant& prune_size)
+{
+    return std::max(1, prune_size.toInt());
+}
+
 struct ProxySetting {
     bool is_set;
     QString ip;
@@ -96,6 +130,7 @@ void OptionsModel::addOverriddenOption(const std::string &option)
 bool OptionsModel::Init(bilingual_str& error)
 {
     // Initialize display settings from stored settings.
+    m_prune_size_gb = PruneSizeGB(node().getPersistentSetting("prune"));
     ProxySetting proxy = ParseProxyString(SettingToString(node().getPersistentSetting("proxy"), GetDefaultProxyAddress().toStdString()));
     m_proxy_ip = proxy.ip;
     m_proxy_port = proxy.port;
@@ -155,7 +190,7 @@ bool OptionsModel::Init(bilingual_str& error)
     // These are shared with the core or have a command-line parameter
     // and we want command-line parameters to overwrite the GUI settings.
     for (OptionID option : {DatabaseCache, ThreadsScriptVerif, SpendZeroConfChange, ExternalSignerPath, MapPortUPnP,
-                            MapPortNatpmp, Listen, Server, ProxyUse, ProxyUseTor}) {
+                            MapPortNatpmp, Listen, Server, Prune, ProxyUse, ProxyUseTor}) {
         std::string setting = SettingName(option);
         if (node().isSettingIgnored(setting)) addOverriddenOption("-" + setting);
         try {
@@ -175,11 +210,6 @@ bool OptionsModel::Init(bilingual_str& error)
     // by command-line and show this in the UI.
 
     // Main
-    if (!settings.contains("bPrune"))
-        settings.setValue("bPrune", false);
-    if (!settings.contains("nPruneSize"))
-        settings.setValue("nPruneSize", DEFAULT_PRUNE_TARGET_GB);
-    SetPruneEnabled(settings.value("bPrune").toBool());
     if (!settings.contains("strDataDir"))
         settings.setValue("strDataDir", GUIUtil::getDefaultDataDirectory());
 
@@ -288,29 +318,27 @@ static const QString GetDefaultProxyAddress()
     return QString("%1:%2").arg(DEFAULT_GUI_PROXY_HOST).arg(DEFAULT_GUI_PROXY_PORT);
 }
 
-void OptionsModel::SetPruneEnabled(bool prune, bool force)
+void OptionsModel::SetPruneTargetGB(int prune_target_gb)
 {
-    QSettings settings;
+    const util::SettingsValue cur_value = node().getPersistentSetting("prune");
-    settings.setValue("bPrune", prune);
+    const util::SettingsValue new_value = PruneSetting(prune_target_gb > 0, prune_target_gb);
-    const int64_t prune_target_mib = PruneGBtoMiB(settings.value("nPruneSize").toInt());
-    std::string prune_val = prune ? ToString(prune_target_mib) : "0";
-    if (force) {
-        gArgs.ForceSetArg("-prune", prune_val);
-        return;
-    }
-    if (!gArgs.SoftSetArg("-prune", prune_val)) {
-        addOverriddenOption("-prune");
-    }
-}
 
-void OptionsModel::SetPruneTargetGB(int prune_target_gb, bool force)
+    m_prune_size_gb = prune_target_gb;
-{
+
-    const bool prune = prune_target_gb > 0;
+    // Force setting to take effect. It is still safe to change the value at
-    if (prune) {
+    // this point because this function is only called after the intro screen is
-        QSettings settings;
+    // shown, before the node starts.
-        settings.setValue("nPruneSize", prune_target_gb);
+    node().forceSetting("prune", new_value);
+
+    // Update settings.json if value configured in intro screen is different
+    // from saved value. Avoid writing settings.json if bitcoin.conf value
+    // doesn't need to be overridden.
+    if (PruneEnabled(cur_value) != PruneEnabled(new_value) ||
+        PruneSizeGB(cur_value) != PruneSizeGB(new_value)) {
+        // Call UpdateRwSetting() instead of setOption() to avoid setting
+        // RestartRequired flag
+        UpdateRwSetting(node(), Prune, new_value);
     }
-    SetPruneEnabled(prune, force);
 }
 
 // read QSettings values and return them
@@ -401,9 +429,9 @@ QVariant OptionsModel::getOption(OptionID option) const
     case EnablePSBTControls:
         return settings.value("enable_psbt_controls");
     case Prune:
-        return settings.value("bPrune");
+        return PruneEnabled(setting());
     case PruneSize:
-        return settings.value("nPruneSize");
+        return m_prune_size_gb;
     case DatabaseCache:
         return qlonglong(SettingToInt(setting(), nDefaultDbCache));
     case ThreadsScriptVerif:
@@ -556,15 +584,18 @@ bool OptionsModel::setOption(OptionID option, const QVariant& value)
         settings.setValue("enable_psbt_controls", m_enable_psbt_controls);
         break;
     case Prune:
-        if (settings.value("bPrune") != value) {
+        if (changed()) {
-            settings.setValue("bPrune", value);
+            update(PruneSetting(value.toBool(), m_prune_size_gb));
             setRestartRequired(true);
         }
         break;
     case PruneSize:
-        if (settings.value("nPruneSize") != value) {
+        if (changed()) {
-            settings.setValue("nPruneSize", value);
+            m_prune_size_gb = ParsePruneSizeGB(value);
-            setRestartRequired(true);
+            if (getOption(Prune).toBool()) {
+                update(PruneSetting(true, m_prune_size_gb));
+                setRestartRequired(true);
+            }
         }
         break;
     case DatabaseCache:
@@ -674,6 +705,8 @@ void OptionsModel::checkAndMigrate()
     migrate_setting(MapPortNatpmp, "fUseNatpmp");
     migrate_setting(Listen, "fListen");
     migrate_setting(Server, "server");
+    migrate_setting(PruneSize, "nPruneSize");
+    migrate_setting(Prune, "bPrune");
     migrate_setting(ProxyIP, "addrProxy");
     migrate_setting(ProxyUse, "fUseProxy");
     migrate_setting(ProxyIPTor, "addrSeparateProxyTor");

src/qt/optionsmodel.h

@@ -99,8 +99,7 @@ public:
     const QString& getOverriddenByCommandLine() { return strOverriddenByCommandLine; }
 
     /* Explicit setters */
-    void SetPruneEnabled(bool prune, bool force = false);
+    void SetPruneTargetGB(int prune_target_gb);
-    void SetPruneTargetGB(int prune_target_gb, bool force = false);
 
     /* Restart flag helper */
     void setRestartRequired(bool fRequired);
@@ -125,6 +124,7 @@ private:
     //! In-memory settings for display. These are stored persistently by the
     //! bitcoin node but it's also nice to store them in memory to prevent them
     //! getting cleared when enable/disable toggles are used in the GUI.
+    int m_prune_size_gb;
     QString m_proxy_ip;
     QString m_proxy_port;
     QString m_onion_ip;

src/qt/test/optiontests.cpp

@@ -36,6 +36,8 @@ void OptionTests::migrateSettings()
     settings.setValue("nThreadsScriptVerif", 12);
     settings.setValue("fUseUPnP", false);
     settings.setValue("fListen", false);
+    settings.setValue("bPrune", true);
+    settings.setValue("nPruneSize", 3);
     settings.setValue("fUseProxy", true);
     settings.setValue("addrProxy", "proxy:123");
     settings.setValue("fUseSeparateProxyTor", true);
@@ -50,6 +52,8 @@ void OptionTests::migrateSettings()
     QVERIFY(!settings.contains("nThreadsScriptVerif"));
     QVERIFY(!settings.contains("fUseUPnP"));
     QVERIFY(!settings.contains("fListen"));
+    QVERIFY(!settings.contains("bPrune"));
+    QVERIFY(!settings.contains("nPruneSize"));
     QVERIFY(!settings.contains("fUseProxy"));
     QVERIFY(!settings.contains("addrProxy"));
     QVERIFY(!settings.contains("fUseSeparateProxyTor"));
@@ -61,7 +65,8 @@ void OptionTests::migrateSettings()
         "    \"listen\": false,\n"
         "    \"onion\": \"onion:234\",\n"
         "    \"par\": \"12\",\n"
-        "    \"proxy\": \"proxy:123\"\n"
+        "    \"proxy\": \"proxy:123\",\n"
+        "    \"prune\": \"2861\"\n"
         "}\n");
 }