Method bumpFee

src/qt/walletmodel.cpp:503–562

}

bool WalletModel::bumpFee(uint256 hash)
{
    CCoinControl coin_control;
    coin_control.m_signal_bip125_rbf = true;
    std::vector<std::string> errors;
    CAmount old_fee;
    CAmount new_fee;
    CMutableTransaction mtx;
    if (!m_wallet->createBumpTransaction(hash, coin_control, 0 /* totalFee */, errors, old_fee, new_fee, mtx)) {
        QMessageBox::critical(0, tr("Fee bump error"), tr("Increasing transaction fee failed") + "<br />(" +
            (errors.size() ? QString::fromStdString(errors[0]) : "") +")");
         return false;
    }

    // allow a user based fee verification
    QString questionString = tr("Do you want to increase the fee?");
    questionString.append("<br />");
    questionString.append("<table style=\"text-align: left;\">");
    questionString.append("<tr><td>");
    questionString.append(tr("Current fee:"));
    questionString.append("</td><td>");
    questionString.append(BitcoinUnits::formatHtmlWithUnit(getOptionsModel()->getDisplayUnit(), old_fee));
    questionString.append("</td></tr><tr><td>");
    questionString.append(tr("Increase:"));
    questionString.append("</td><td>");
    questionString.append(BitcoinUnits::formatHtmlWithUnit(getOptionsModel()->getDisplayUnit(), new_fee - old_fee));
    questionString.append("</td></tr><tr><td>");
    questionString.append(tr("New fee:"));
    questionString.append("</td><td>");
    questionString.append(BitcoinUnits::formatHtmlWithUnit(getOptionsModel()->getDisplayUnit(), new_fee));
    questionString.append("</td></tr></table>");
    SendConfirmationDialog confirmationDialog(tr("Confirm fee bump"), questionString);
    confirmationDialog.exec();
    QMessageBox::StandardButton retval = static_cast<QMessageBox::StandardButton>(confirmationDialog.result());

    // cancel sign&broadcast if user doesn't want to bump the fee
    if (retval != QMessageBox::Yes) {
        return false;
    }

    WalletModel::UnlockContext ctx(requestUnlock());
    if(!ctx.isValid())
    {
        return false;
    }

    // sign bumped transaction
    if (!m_wallet->signBumpTransaction(mtx)) {
        QMessageBox::critical(0, tr("Fee bump error"), tr("Can't sign transaction."));
        return false;
    }
    // commit the bumped transaction
    uint256 txid;
    if(!m_wallet->commitBumpTransaction(hash, std::move(mtx), errors, txid)) {
        QMessageBox::critical(0, tr("Fee bump error"), tr("Could not commit transaction") + "<br />(" +
            QString::fromStdString(errors[0])+")");
         return false;
    }