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Attempt to carve the fee from a partial payment early

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Do this for both the estimate and actual fee.

#7337
This commit is contained in:
Alex Opie 2021-01-22 12:02:12 +13:00
parent cb70ae9450
commit 520ce1ca81
1 changed files with 34 additions and 20 deletions
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54
src/wallet/wallet2.cpp
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@ -10128,6 +10128,38 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_2(std::vector<cryp
const size_t num_outputs = get_num_outputs(tx.dsts, m_transfers, tx.selected_transfers);
needed_fee = estimate_fee(use_per_byte_fee, use_rct ,tx.selected_transfers.size(), fake_outs_count, num_outputs, extra.size(), bulletproof, clsag, base_fee, fee_multiplier, fee_quantization_mask);
auto try_carving_from_partial_payment = [&](uint64_t needed_fee, uint64_t available_for_fee)
{
// The check against original_output_index is to ensure the last entry in tx.dsts is really
// a partial payment. Otherwise multiple requested outputs to the same address could
// fool this logic into thinking there is a partial payment.
if (needed_fee > available_for_fee && !dsts.empty() && dsts[0].amount > 0 && tx.dsts.size() > original_output_index)
{
// we don't have enough for the fee, but we've only partially paid the current address,
// so we can take the fee from the paid amount, since we'll have to make another tx anyway
LOG_PRINT_L2("Attempting to carve tx fee " << print_money(needed_fee) << " from partial payment (first pass)");
std::vector<cryptonote::tx_destination_entry>::iterator i;
i = std::find_if(tx.dsts.begin(), tx.dsts.end(),
[&](const cryptonote::tx_destination_entry &d) { return !memcmp (&d.addr, &dsts[0].addr, sizeof(dsts[0].addr)); });
THROW_WALLET_EXCEPTION_IF(i == tx.dsts.end(), error::wallet_internal_error, "paid address not found in outputs");
if (i->amount > needed_fee)
{
uint64_t new_paid_amount = i->amount /*+ test_ptx.fee*/ - needed_fee;
LOG_PRINT_L2("Adjusting amount paid to " << get_account_address_as_str(m_nettype, i->is_subaddress, i->addr) << " from " <<
print_money(i->amount) << " to " << print_money(new_paid_amount) << " to accommodate " <<
print_money(needed_fee) << " fee");
dsts[0].amount += i->amount - new_paid_amount;
i->amount = new_paid_amount;
test_ptx.fee = needed_fee;
available_for_fee = needed_fee;
}
}
return available_for_fee;
};
// Try to carve the estimated fee from the partial payment (if there is one)
available_for_fee = try_carving_from_partial_payment(needed_fee, available_for_fee);
uint64_t inputs = 0, outputs = needed_fee;
for (size_t idx: tx.selected_transfers) inputs += m_transfers[idx].amount();
for (const auto &o: tx.dsts) outputs += o.amount;
@ -10153,26 +10185,8 @@ std::vector<wallet2::pending_tx> wallet2::create_transactions_2(std::vector<cryp
LOG_PRINT_L2("Made a " << get_weight_string(test_ptx.tx, txBlob.size()) << " tx, with " << print_money(available_for_fee) << " available for fee (" <<
print_money(needed_fee) << " needed)");
if (needed_fee > available_for_fee && !dsts.empty() && dsts[0].amount > 0)
{
// we don't have enough for the fee, but we've only partially paid the current address,
// so we can take the fee from the paid amount, since we'll have to make another tx anyway
std::vector<cryptonote::tx_destination_entry>::iterator i;
i = std::find_if(tx.dsts.begin(), tx.dsts.end(),
[&](const cryptonote::tx_destination_entry &d) { return !memcmp (&d.addr, &dsts[0].addr, sizeof(dsts[0].addr)); });
THROW_WALLET_EXCEPTION_IF(i == tx.dsts.end(), error::wallet_internal_error, "paid address not found in outputs");
if (i->amount > needed_fee)
{
uint64_t new_paid_amount = i->amount /*+ test_ptx.fee*/ - needed_fee;
LOG_PRINT_L2("Adjusting amount paid to " << get_account_address_as_str(m_nettype, i->is_subaddress, i->addr) << " from " <<
print_money(i->amount) << " to " << print_money(new_paid_amount) << " to accommodate " <<
print_money(needed_fee) << " fee");
dsts[0].amount += i->amount - new_paid_amount;
i->amount = new_paid_amount;
test_ptx.fee = needed_fee;
available_for_fee = needed_fee;
}
}
// Try to carve the fee from the partial payment again after updating from estimate to actual
available_for_fee = try_carving_from_partial_payment(needed_fee, available_for_fee);
if (needed_fee > available_for_fee)
{