qml: add and wire dbcache settings to OptionsModel backend

Author: jarolrod

src/qml/components/DeveloperOptions.qml

@@ -25,10 +25,11 @@ ColumnLayout {
     Setting {
         id: dbcacheSetting
         Layout.fillWidth: true
-        header: qsTr("Database cache size")
+        header: qsTr("Database cache size (MiB)")
         actionItem: ValueInput {
             parentState: dbcacheSetting.state
-            description: ("450 MiB")
+            description: optionsModel.dbcacheSizeMiB
+            onEditingFinished: optionsModel.dbcacheSizeMiB = parseInt(text)
         }
         onClicked: loadedItem.forceActiveFocus()
     }

src/qml/options_model.cpp

@@ -7,6 +7,7 @@
 #include <interfaces/node.h>
 #include <qt/guiconstants.h>
 #include <qt/optionsmodel.h>
+#include <txdb.h>
 #include <univalue.h>
 #include <util/settings.h>
 #include <util/system.h>
@@ -16,11 +17,22 @@
 OptionsQmlModel::OptionsQmlModel(interfaces::Node& node)
     : m_node{node}
 {
+    m_dbcache_size_mib = SettingToInt(m_node.getPersistentSetting("dbcache"), nDefaultDbCache);
+
     int64_t prune_value{SettingToInt(m_node.getPersistentSetting("prune"), 0)};
     m_prune = (prune_value > 1);
     m_prune_size_gb = m_prune ? PruneMiBtoGB(prune_value) : DEFAULT_PRUNE_TARGET_GB;
 }
 
+void OptionsQmlModel::setDbcacheSizeMiB(int new_dbcache_size_mib)
+{
+    if (new_dbcache_size_mib != m_dbcache_size_mib) {
+        m_dbcache_size_mib = new_dbcache_size_mib;
+        m_node.updateRwSetting("dbcache", new_dbcache_size_mib);
+        Q_EMIT dbcacheSizeMiBChanged(new_dbcache_size_mib);
+    }
+}
+
 void OptionsQmlModel::setListen(bool new_listen)
 {
     if (new_listen != m_listen) {

src/qml/options_model.h

@@ -17,6 +17,7 @@ class Node;
 class OptionsQmlModel : public QObject
 {
     Q_OBJECT
+    Q_PROPERTY(int dbcacheSizeMiB READ dbcacheSizeMiB WRITE setDbcacheSizeMiB NOTIFY dbcacheSizeMiBChanged)
     Q_PROPERTY(bool listen READ listen WRITE setListen NOTIFY listenChanged)
     Q_PROPERTY(bool natpmp READ natpmp WRITE setNatpmp NOTIFY natpmpChanged)
     Q_PROPERTY(bool prune READ prune WRITE setPrune NOTIFY pruneChanged)
@@ -27,6 +28,8 @@ class OptionsQmlModel : public QObject
 public:
     explicit OptionsQmlModel(interfaces::Node& node);
 
+    int dbcacheSizeMiB() const { return m_dbcache_size_mib; }
+    void setDbcacheSizeMiB(int new_dbcache_size_mib);
     bool listen() const { return m_listen; }
     void setListen(bool new_listen);
     bool natpmp() const { return m_natpmp; }
@@ -41,6 +44,7 @@ class OptionsQmlModel : public QObject
     void setUpnp(bool new_upnp);
 
 Q_SIGNALS:
+    void dbcacheSizeMiBChanged(int new_dbcache_size_mib);
     void listenChanged(bool new_listen);
     void natpmpChanged(bool new_natpmp);
     void pruneChanged(bool new_prune);
@@ -52,6 +56,7 @@ class OptionsQmlModel : public QObject
     interfaces::Node& m_node;
 
     // Properties that are exposed to QML.
+    int m_dbcache_size_mib;
     bool m_listen;
     bool m_natpmp;
     bool m_prune;