GUI/Options: Configure mempooltruc using settings

src/qt/optionsdialog.cpp

@@ -237,6 +237,13 @@ OptionsDialog::OptionsDialog(QWidget* parent, bool enableWallet)
     mempoolreplacement->addItem(QString("with a higher mining fee (no opt-out)"), QVariant("fee,-optin"));
     CreateOptionUI(verticalLayout_Mempool, mempoolreplacement, tr("Transaction &replacement: %s"));
 
+    mempooltruc = new QValueComboBox(tabMempool);
+    mempooltruc->addItem(QString("do not relay or mine at all"), QVariant("reject"));
+    mempooltruc->addItem(QString("handle the same as other transactions"), QVariant("accept"));
+    mempooltruc->addItem(QString("impose stricter limits requested (DRAFT)"), QVariant("enforce"));
+    mempooltruc->setToolTip(tr("Some transactions signal a request to limit both themselves and other related transactions to more restrictive expectations. Specifically, this would disallow more than 1 unconfirmed predecessor or spending transaction, as well as smaller size limits (see BIP 431 for details), regardless of what policy you have configured."));
+    CreateOptionUI(verticalLayout_Mempool, mempooltruc, tr("Transactions requesting more restrictive policy limits (TRUC): %s"));
+
     maxorphantx = new QSpinBox(tabMempool);
     maxorphantx->setMinimum(0);
     maxorphantx->setMaximum(std::numeric_limits<int>::max());
@@ -707,6 +714,14 @@ void OptionsDialog::setMapper()
     }
     mempoolreplacement->setCurrentIndex(current_mempoolreplacement_index);
 
+    QVariant current_mempooltruc = model->data(model->index(OptionsModel::mempooltruc, 0), Qt::EditRole);
+    int current_mempooltruc_index = mempooltruc->findData(current_mempooltruc);
+    if (current_mempooltruc_index == -1) {
+        mempooltruc->addItem(current_mempooltruc.toString(), current_mempooltruc);
+        current_mempooltruc_index = mempooltruc->count() - 1;
+    }
+    mempooltruc->setCurrentIndex(current_mempooltruc_index);
+
     mapper->addMapping(maxorphantx, OptionsModel::maxorphantx);
     mapper->addMapping(maxmempool, OptionsModel::maxmempool);
     mapper->addMapping(incrementalrelayfee, OptionsModel::incrementalrelayfee);
@@ -920,6 +935,7 @@ void OptionsDialog::on_okButton_clicked()
     }
 
     model->setData(model->index(OptionsModel::mempoolreplacement, 0), mempoolreplacement->itemData(mempoolreplacement->currentIndex()));
+    model->setData(model->index(OptionsModel::mempooltruc, 0), mempooltruc->itemData(mempooltruc->currentIndex()));
 
     if (dustdynamic_enable->isChecked()) {
         if (dustdynamic_target->isChecked()) {

src/qt/optionsdialog.h

@@ -103,6 +103,7 @@ private:
     QSpinBox *blockreconstructionextratxn;
 
     QValueComboBox *mempoolreplacement;
+    QValueComboBox *mempooltruc;
     QSpinBox *maxorphantx;
     BitcoinAmountField *incrementalrelayfee;
     QSpinBox *maxmempool;

src/qt/optionsmodel.cpp

@@ -223,6 +223,16 @@ static QString CanonicalMempoolReplacement(const OptionsModel& model)
     assert(0);
 }
 
+static QString CanonicalMempoolTRUC(const OptionsModel& model)
+{
+    switch (model.node().mempool().m_opts.truc_policy) {
+    case TRUCPolicy::Reject:  return "reject";
+    case TRUCPolicy::Accept:  return "accept";
+    case TRUCPolicy::Enforce: return "enforce";
+    }
+    assert(0);
+}
+
 OptionsModel::OptionsModel(interfaces::Node& node, QObject *parent) :
     QAbstractListModel(parent), m_node{node}
 {
@@ -650,6 +660,8 @@ QVariant OptionsModel::getOption(OptionID option, const std::string& suffix) con
         return gArgs.GetBoolArg("-peerblockfilters", DEFAULT_PEERBLOCKFILTERS);
     case mempoolreplacement:
         return CanonicalMempoolReplacement(*this);
+    case mempooltruc:
+        return CanonicalMempoolTRUC(*this);
     case maxorphantx:
         return qlonglong(gArgs.GetIntArg("-maxorphantx", DEFAULT_MAX_ORPHAN_TRANSACTIONS));
     case maxmempool:
@@ -1049,6 +1061,21 @@ bool OptionsModel::setOption(OptionID option, const QVariant& value, const std::
         }
         break;
     }
+    case mempooltruc:
+    {
+        if (changed()) {
+            QString nv = value.toString();
+            if (nv == "reject") {
+                node().mempool().m_opts.truc_policy = TRUCPolicy::Reject;
+            } else if (nv == "accept") {
+                node().mempool().m_opts.truc_policy = TRUCPolicy::Accept;
+            } else if (nv == "enforce") {
+                node().mempool().m_opts.truc_policy = TRUCPolicy::Enforce;
+            }
+            node().updateRwSetting("mempooltruc", nv.toStdString());
+        }
+        break;
+    }
     case maxorphantx:
     {
         if (changed()) {

src/qt/optionsmodel.h

@@ -82,6 +82,7 @@ public:
         peerbloomfilters,       // bool
         peerblockfilters,       // bool
         mempoolreplacement,
+        mempooltruc,
         maxorphantx,
         maxmempool,
         incrementalrelayfee,