void SendCoinsDialog::updateSmartFeeLabel()
{
if(!model || !model->getOptionsModel())
return;
CCoinControl coin_control;
updateCoinControlState(coin_control);
coin_control.m_feerate.reset(); // Explicitly use only fee estimation rate for smart fee labels
FeeCalculation feeCalc;
CFeeRate feeRate = CFeeRate(GetMinimumFee(1000, coin_control, ::mempool, ::feeEstimator, &feeCalc));
ui->labelSmartFee->setText(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), feeRate.GetFeePerK()) + "/kB");
if (feeCalc.reason == FeeReason::FALLBACK) {
ui->labelSmartFee2->show(); // (Smart fee not initialized yet. This usually takes a few blocks...)
ui->labelFeeEstimation->setText("");
ui->fallbackFeeWarningLabel->setVisible(true);
int lightness = ui->fallbackFeeWarningLabel->palette().color(QPalette::WindowText).lightness();
QColor warning_colour(255 - (lightness / 5), 176 - (lightness / 3), 48 - (lightness / 14));
ui->fallbackFeeWarningLabel->setStyleSheet("QLabel { color: " + warning_colour.name() + "; }");
ui->fallbackFeeWarningLabel->setIndent(QFontMetrics(ui->fallbackFeeWarningLabel->font()).width("x"));
}
else
{
ui->labelSmartFee2->hide();
ui->labelFeeEstimation->setText(tr("Estimated to begin confirmation within %n block(s).", "", feeCalc.returnedTarget));
ui->fallbackFeeWarningLabel->setVisible(false);
}
updateFeeMinimizedLabel();
}
Result CreateTransaction(const CWallet* wallet, const uint256& txid, const CCoinControl& coin_control, CAmount total_fee, std::vector<std::string>& errors,
CAmount& old_fee, CAmount& new_fee, CMutableTransaction& mtx)
{
LOCK2(cs_main, wallet->cs_wallet);
errors.clear();
auto it = wallet->mapWallet.find(txid);
if (it == wallet->mapWallet.end()) {
errors.push_back("Invalid or non-wallet transaction id");
return Result::INVALID_ADDRESS_OR_KEY;
}
const CWalletTx& wtx = it->second;
Result result = PreconditionChecks(wallet, wtx, errors);
if (result != Result::OK) {
return result;
}
if (!SignalsOptInRBF(*wtx.tx)) {
errors.push_back("Transaction is not BIP 125 replaceable");
return Result::WALLET_ERROR;
}
if (wtx.mapValue.count("replaced_by_txid")) {
errors.push_back(strprintf("Cannot bump transaction %s which was already bumped by transaction %s", txid.ToString(), wtx.mapValue.at("replaced_by_txid")));
return Result::WALLET_ERROR;
}
// check that original tx consists entirely of our inputs
// if not, we can't bump the fee, because the wallet has no way of knowing the value of the other inputs (thus the fee)
if (!wallet->IsAllFromMe(*wtx.tx, ISMINE_SPENDABLE)) {
errors.push_back("Transaction contains inputs that don't belong to this wallet");
return Result::WALLET_ERROR;
}
// figure out which output was change
// if there was no change output or multiple change outputs, fail
int nOutput = -1;
for (size_t i = 0; i < wtx.tx->vout.size(); ++i) {
if (wallet->IsChange(wtx.tx->vout[i])) {
if (nOutput != -1) {
errors.push_back("Transaction has multiple change outputs");
return Result::WALLET_ERROR;
}
nOutput = i;
}
}
if (nOutput == -1) {
errors.push_back("Transaction does not have a change output");
return Result::WALLET_ERROR;
}
// Calculate the expected size of the new transaction.
int64_t txSize = GetVirtualTransactionSize(*(wtx.tx));
const int64_t maxNewTxSize = CalculateMaximumSignedTxSize(*wtx.tx, wallet);
if (maxNewTxSize < 0) {
errors.push_back("Transaction contains inputs that cannot be signed");
return Result::INVALID_ADDRESS_OR_KEY;
}
// calculate the old fee and fee-rate
old_fee = wtx.GetDebit(ISMINE_SPENDABLE) - wtx.tx->GetValueOut();
CFeeRate nOldFeeRate(old_fee, txSize);
CFeeRate nNewFeeRate;
// The wallet uses a conservative WALLET_INCREMENTAL_RELAY_FEE value to
// future proof against changes to network wide policy for incremental relay
// fee that our node may not be aware of.
CFeeRate walletIncrementalRelayFee = CFeeRate(WALLET_INCREMENTAL_RELAY_FEE);
if (::incrementalRelayFee > walletIncrementalRelayFee) {
walletIncrementalRelayFee = ::incrementalRelayFee;
}
if (total_fee > 0) {
CAmount minTotalFee = nOldFeeRate.GetFee(maxNewTxSize) + ::incrementalRelayFee.GetFee(maxNewTxSize);
if (total_fee < minTotalFee) {
errors.push_back(strprintf("Insufficient totalFee, must be at least %s (oldFee %s + incrementalFee %s)",
FormatMoney(minTotalFee), FormatMoney(nOldFeeRate.GetFee(maxNewTxSize)), FormatMoney(::incrementalRelayFee.GetFee(maxNewTxSize))));
return Result::INVALID_PARAMETER;
}
CAmount requiredFee = GetRequiredFee(maxNewTxSize);
if (total_fee < requiredFee) {
errors.push_back(strprintf("Insufficient totalFee (cannot be less than required fee %s)",
FormatMoney(requiredFee)));
return Result::INVALID_PARAMETER;
}
new_fee = total_fee;
nNewFeeRate = CFeeRate(total_fee, maxNewTxSize);
} else {
new_fee = GetMinimumFee(maxNewTxSize, coin_control, mempool, ::feeEstimator, nullptr /* FeeCalculation */);
nNewFeeRate = CFeeRate(new_fee, maxNewTxSize);
// New fee rate must be at least old rate + minimum incremental relay rate
// walletIncrementalRelayFee.GetFeePerK() should be exact, because it's initialized
// in that unit (fee per kb).
// However, nOldFeeRate is a calculated value from the tx fee/size, so
// add 1 satoshi to the result, because it may have been rounded down.
if (nNewFeeRate.GetFeePerK() < nOldFeeRate.GetFeePerK() + 1 + walletIncrementalRelayFee.GetFeePerK()) {
nNewFeeRate = CFeeRate(nOldFeeRate.GetFeePerK() + 1 + walletIncrementalRelayFee.GetFeePerK());
new_fee = nNewFeeRate.GetFee(maxNewTxSize);
}
}
// Check that in all cases the new fee doesn't violate maxTxFee
if (new_fee > maxTxFee) {
errors.push_back(strprintf("Specified or calculated fee %s is too high (cannot be higher than maxTxFee %s)",
FormatMoney(new_fee), FormatMoney(maxTxFee)));
return Result::WALLET_ERROR;
}
// check that fee rate is higher than mempool's minimum fee
// (no point in bumping fee if we know that the new tx won't be accepted to the mempool)
// This may occur if the user set TotalFee or paytxfee too low, if fallbackfee is too low, or, perhaps,
// in a rare situation where the mempool minimum fee increased significantly since the fee estimation just a
// moment earlier. In this case, we report an error to the user, who may use total_fee to make an adjustment.
CFeeRate minMempoolFeeRate = mempool.GetMinFee(gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000);
if (nNewFeeRate.GetFeePerK() < minMempoolFeeRate.GetFeePerK()) {
errors.push_back(strprintf(
"New fee rate (%s) is lower than the minimum fee rate (%s) to get into the mempool -- "
"the totalFee value should be at least %s or the settxfee value should be at least %s to add transaction",
FormatMoney(nNewFeeRate.GetFeePerK()),
FormatMoney(minMempoolFeeRate.GetFeePerK()),
FormatMoney(minMempoolFeeRate.GetFee(maxNewTxSize)),
FormatMoney(minMempoolFeeRate.GetFeePerK())));
return Result::WALLET_ERROR;
}
// Now modify the output to increase the fee.
// If the output is not large enough to pay the fee, fail.
CAmount nDelta = new_fee - old_fee;
assert(nDelta > 0);
mtx = *wtx.tx;
CTxOut* poutput = &(mtx.vout[nOutput]);
if (poutput->nValue < nDelta) {
errors.push_back("Change output is too small to bump the fee");
return Result::WALLET_ERROR;
}
// If the output would become dust, discard it (converting the dust to fee)
poutput->nValue -= nDelta;
if (poutput->nValue <= GetDustThreshold(*poutput, ::dustRelayFee)) {
LogPrint(BCLog::RPC, "Bumping fee and discarding dust output\n");
new_fee += poutput->nValue;
mtx.vout.erase(mtx.vout.begin() + nOutput);
}
// Mark new tx not replaceable, if requested.
if (!coin_control.signalRbf) {
for (auto& input : mtx.vin) {
if (input.nSequence < 0xfffffffe) input.nSequence = 0xfffffffe;
}
}
return Result::OK;
}
void CoinControlDialog::updateLabels(WalletModel *model, QDialog* dialog)
{
if (!model)
return;
// nPayAmount
CAmount nPayAmount = 0;
bool fDust = false;
CMutableTransaction txDummy;
for (const CAmount &amount : CoinControlDialog::payAmounts)
{
nPayAmount += amount;
if (amount > 0)
{
CTxOut txout(amount, (CScript)std::vector<unsigned char>(24, 0));
txDummy.vout.push_back(txout);
fDust |= IsDust(txout, ::dustRelayFee);
}
}
CAmount nAmount = 0;
CAmount nPayFee = 0;
CAmount nAfterFee = 0;
CAmount nChange = 0;
unsigned int nBytes = 0;
unsigned int nBytesInputs = 0;
unsigned int nQuantity = 0;
bool fWitness = false;
std::vector<COutPoint> vCoinControl;
std::vector<COutput> vOutputs;
coinControl->ListSelected(vCoinControl);
model->getOutputs(vCoinControl, vOutputs);
for (const COutput& out : vOutputs) {
// unselect already spent, very unlikely scenario, this could happen
// when selected are spent elsewhere, like rpc or another computer
uint256 txhash = out.tx->GetHash();
COutPoint outpt(txhash, out.i);
if (model->isSpent(outpt))
{
coinControl->UnSelect(outpt);
continue;
}
// Quantity
nQuantity++;
// Amount
nAmount += out.tx->tx->vout[out.i].nValue;
// Bytes
CTxDestination address;
int witnessversion = 0;
std::vector<unsigned char> witnessprogram;
if (out.tx->tx->vout[out.i].scriptPubKey.IsWitnessProgram(witnessversion, witnessprogram))
{
nBytesInputs += (32 + 4 + 1 + (107 / WITNESS_SCALE_FACTOR) + 4);
fWitness = true;
}
else if(ExtractDestination(out.tx->tx->vout[out.i].scriptPubKey, address))
{
CPubKey pubkey;
CKeyID *keyid = boost::get<CKeyID>(&address);
if (keyid && model->getPubKey(*keyid, pubkey))
{
nBytesInputs += (pubkey.IsCompressed() ? 148 : 180);
}
else
nBytesInputs += 148; // in all error cases, simply assume 148 here
}
else nBytesInputs += 148;
}
// calculation
if (nQuantity > 0)
{
// Bytes
nBytes = nBytesInputs + ((CoinControlDialog::payAmounts.size() > 0 ? CoinControlDialog::payAmounts.size() + 1 : 2) * 34) + 10; // always assume +1 output for change here
if (fWitness)
{
// there is some fudging in these numbers related to the actual virtual transaction size calculation that will keep this estimate from being exact.
// usually, the result will be an overestimate within a couple of satoshis so that the confirmation dialog ends up displaying a slightly smaller fee.
// also, the witness stack size value is a variable sized integer. usually, the number of stack items will be well under the single byte var int limit.
nBytes += 2; // account for the serialized marker and flag bytes
nBytes += nQuantity; // account for the witness byte that holds the number of stack items for each input.
}
// in the subtract fee from amount case, we can tell if zero change already and subtract the bytes, so that fee calculation afterwards is accurate
if (CoinControlDialog::fSubtractFeeFromAmount)
if (nAmount - nPayAmount == 0)
nBytes -= 34;
// Fee
nPayFee = GetMinimumFee(nBytes, *coinControl, ::mempool, ::feeEstimator, nullptr /* FeeCalculation */);
if (nPayAmount > 0)
{
nChange = nAmount - nPayAmount;
if (!CoinControlDialog::fSubtractFeeFromAmount)
nChange -= nPayFee;
// Never create dust outputs; if we would, just add the dust to the fee.
if (nChange > 0 && nChange < MIN_CHANGE)
{
CTxOut txout(nChange, (CScript)std::vector<unsigned char>(24, 0));
if (IsDust(txout, ::dustRelayFee))
{
nPayFee += nChange;
nChange = 0;
if (CoinControlDialog::fSubtractFeeFromAmount)
nBytes -= 34; // we didn't detect lack of change above
}
}
if (nChange == 0 && !CoinControlDialog::fSubtractFeeFromAmount)
nBytes -= 34;
}
// after fee
nAfterFee = std::max<CAmount>(nAmount - nPayFee, 0);
}
// actually update labels
int nDisplayUnit = BitcoinUnits::BTC;
if (model && model->getOptionsModel())
nDisplayUnit = model->getOptionsModel()->getDisplayUnit();
QLabel *l1 = dialog->findChild<QLabel *>("labelCoinControlQuantity");
QLabel *l2 = dialog->findChild<QLabel *>("labelCoinControlAmount");
QLabel *l3 = dialog->findChild<QLabel *>("labelCoinControlFee");
QLabel *l4 = dialog->findChild<QLabel *>("labelCoinControlAfterFee");
QLabel *l5 = dialog->findChild<QLabel *>("labelCoinControlBytes");
QLabel *l7 = dialog->findChild<QLabel *>("labelCoinControlLowOutput");
QLabel *l8 = dialog->findChild<QLabel *>("labelCoinControlChange");
// enable/disable "dust" and "change"
dialog->findChild<QLabel *>("labelCoinControlLowOutputText")->setEnabled(nPayAmount > 0);
dialog->findChild<QLabel *>("labelCoinControlLowOutput") ->setEnabled(nPayAmount > 0);
dialog->findChild<QLabel *>("labelCoinControlChangeText") ->setEnabled(nPayAmount > 0);
dialog->findChild<QLabel *>("labelCoinControlChange") ->setEnabled(nPayAmount > 0);
// stats
l1->setText(QString::number(nQuantity)); // Quantity
l2->setText(BitcoinUnits::formatWithUnit(nDisplayUnit, nAmount)); // Amount
l3->setText(BitcoinUnits::formatWithUnit(nDisplayUnit, nPayFee)); // Fee
l4->setText(BitcoinUnits::formatWithUnit(nDisplayUnit, nAfterFee)); // After Fee
l5->setText(((nBytes > 0) ? ASYMP_UTF8 : "") + QString::number(nBytes)); // Bytes
l7->setText(fDust ? tr("yes") : tr("no")); // Dust
l8->setText(BitcoinUnits::formatWithUnit(nDisplayUnit, nChange)); // Change
if (nPayFee > 0)
{
l3->setText(ASYMP_UTF8 + l3->text());
l4->setText(ASYMP_UTF8 + l4->text());
if (nChange > 0 && !CoinControlDialog::fSubtractFeeFromAmount)
l8->setText(ASYMP_UTF8 + l8->text());
}
// turn label red when dust
l7->setStyleSheet((fDust) ? "color:red;" : "");
// tool tips
QString toolTipDust = tr("This label turns red if any recipient receives an amount smaller than the current dust threshold.");
// how many satoshis the estimated fee can vary per byte we guess wrong
double dFeeVary = (nBytes != 0) ? (double)nPayFee / nBytes : 0;
QString toolTip4 = tr("Can vary +/- %1 satoshi(s) per input.").arg(dFeeVary);
l3->setToolTip(toolTip4);
l4->setToolTip(toolTip4);
l7->setToolTip(toolTipDust);
l8->setToolTip(toolTip4);
dialog->findChild<QLabel *>("labelCoinControlFeeText") ->setToolTip(l3->toolTip());
dialog->findChild<QLabel *>("labelCoinControlAfterFeeText") ->setToolTip(l4->toolTip());
dialog->findChild<QLabel *>("labelCoinControlBytesText") ->setToolTip(l5->toolTip());
dialog->findChild<QLabel *>("labelCoinControlLowOutputText")->setToolTip(l7->toolTip());
dialog->findChild<QLabel *>("labelCoinControlChangeText") ->setToolTip(l8->toolTip());
// Insufficient funds
QLabel *label = dialog->findChild<QLabel *>("labelCoinControlInsuffFunds");
if (label)
label->setVisible(nChange < 0);
}