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wallet: add SelectionResult::GetChange

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This commit is contained in:
S3RK
2022-07-06 09:00:26 +02:00
parent 72cad28da0
commit 15e97a6886
2 changed files with 46 additions and 0 deletions
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25
src/wallet/coinselection.cpp
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@@ -421,6 +421,11 @@ CAmount SelectionResult::GetSelectedValue() const
return std::accumulate(m_selected_inputs.cbegin(), m_selected_inputs.cend(), CAmount{0}, [](CAmount sum, const auto& coin) { return sum + coin.txout.nValue; });
}
CAmount SelectionResult::GetSelectedEffectiveValue() const
{
return std::accumulate(m_selected_inputs.cbegin(), m_selected_inputs.cend(), CAmount{0}, [](CAmount sum, const auto& coin) { return sum + coin.GetEffectiveValue(); });
}
void SelectionResult::Clear()
{
m_selected_inputs.clear();
@@ -480,4 +485,24 @@ std::string GetAlgorithmName(const SelectionAlgorithm algo)
}
assert(false);
}
CAmount SelectionResult::GetChange(const CAmount min_viable_change, const CAmount change_fee) const
{
// change = SUM(inputs) - SUM(outputs) - fees
// 1) With SFFO we don't pay any fees
// 2) Otherwise we pay all the fees:
// - input fees are covered by GetSelectedEffectiveValue()
// - non_input_fee is included in m_target
// - change_fee
const CAmount change = m_use_effective
? GetSelectedEffectiveValue() - m_target - change_fee
: GetSelectedValue() - m_target;
if (change < min_viable_change) {
return 0;
}
return change;
}
} // namespace wallet