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coinselection.h
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coinselection.h
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// Copyright (c) 2017 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_WALLET_COINSELECTION_H
#define BITCOIN_WALLET_COINSELECTION_H
#include <amount.h>
#include <primitives/transaction.h>
#include <random.h>
class CFeeRate;
//! target minimum change amount
static constexpr Amount MIN_CHANGE{COIN / 100};
//! final minimum change amount after paying for fees
static const Amount MIN_FINAL_CHANGE = MIN_CHANGE / 2;
class CInputCoin {
public:
CInputCoin(const CTransactionRef &tx, unsigned int i) {
if (!tx) {
throw std::invalid_argument("tx should not be null");
}
if (i >= tx->vout.size()) {
throw std::out_of_range("The output index is out of range");
}
outpoint = COutPoint(tx->GetId(), i);
txout = tx->vout[i];
effective_value = txout.nValue;
}
CInputCoin(const CTransactionRef &tx, unsigned int i, int input_bytes)
: CInputCoin(tx, i) {
m_input_bytes = input_bytes;
}
COutPoint outpoint;
CTxOut txout;
Amount effective_value;
Amount m_fee{Amount::zero()};
Amount m_long_term_fee{Amount::zero()};
/**
* Pre-computed estimated size of this output as a fully-signed input in a
* transaction. Can be -1 if it could not be calculated.
*/
int m_input_bytes{-1};
bool operator<(const CInputCoin &rhs) const {
return outpoint < rhs.outpoint;
}
bool operator!=(const CInputCoin &rhs) const {
return outpoint != rhs.outpoint;
}
bool operator==(const CInputCoin &rhs) const {
return outpoint == rhs.outpoint;
}
};
struct CoinEligibilityFilter {
const int conf_mine;
const int conf_theirs;
const uint64_t max_ancestors;
const uint64_t max_descendants;
CoinEligibilityFilter(int conf_mine_, int conf_theirs_,
uint64_t max_ancestors_)
: conf_mine(conf_mine_), conf_theirs(conf_theirs_),
max_ancestors(max_ancestors_), max_descendants(max_ancestors_) {}
CoinEligibilityFilter(int conf_mine_, int conf_theirs_,
uint64_t max_ancestors_, uint64_t max_descendants_)
: conf_mine(conf_mine_), conf_theirs(conf_theirs_),
max_ancestors(max_ancestors_), max_descendants(max_descendants_) {}
};
struct OutputGroup {
std::vector<CInputCoin> m_outputs;
bool m_from_me{true};
Amount m_value = Amount::zero();
int m_depth{999};
size_t m_ancestors{0};
size_t m_descendants{0};
Amount effective_value = Amount::zero();
Amount fee = Amount::zero();
Amount long_term_fee = Amount::zero();
OutputGroup() {}
OutputGroup(std::vector<CInputCoin> &&outputs, bool from_me, Amount value,
int depth, size_t ancestors, size_t descendants)
: m_outputs(std::move(outputs)), m_from_me(from_me), m_value(value),
m_depth(depth), m_ancestors(ancestors), m_descendants(descendants) {}
OutputGroup(const CInputCoin &output, int depth, bool from_me,
size_t ancestors, size_t descendants)
: OutputGroup() {
Insert(output, depth, from_me, ancestors, descendants);
}
void Insert(const CInputCoin &output, int depth, bool from_me,
size_t ancestors, size_t descendants);
std::vector<CInputCoin>::iterator Discard(const CInputCoin &output);
bool
EligibleForSpending(const CoinEligibilityFilter &eligibility_filter) const;
//! Update the OutputGroup's fee, long_term_fee, and effective_value based
//! on the given feerates
void SetFees(const CFeeRate effective_feerate,
const CFeeRate long_term_feerate);
OutputGroup GetPositiveOnlyGroup();
};
bool SelectCoinsBnB(std::vector<OutputGroup> &utxo_pool,
const Amount &target_value, const Amount &cost_of_change,
std::set<CInputCoin> &out_set, Amount &value_ret,
const Amount not_input_fees);
// Original coin selection algorithm as a fallback
bool KnapsackSolver(const Amount nTargetValue, std::vector<OutputGroup> &groups,
std::set<CInputCoin> &setCoinsRet, Amount &nValueRet);
#endif // BITCOIN_WALLET_COINSELECTION_H

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