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// Copyright (c) 2017-2021 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_FEEBUMPER_H
#define BITCOIN_WALLET_FEEBUMPER_H
#include <consensus/consensus.h>
#include <script/interpreter.h>
#include <primitives/transaction.h>
class uint256;
enum class FeeEstimateMode;
struct bilingual_str;
namespace wallet {
class CCoinControl;
class CWallet;
class CWalletTx;
namespace feebumper {
enum class Result
{
OK,
INVALID_ADDRESS_OR_KEY,
INVALID_REQUEST,
INVALID_PARAMETER,
WALLET_ERROR,
MISC_ERROR,
};
//! Return whether transaction can be bumped.
bool TransactionCanBeBumped(const CWallet& wallet, const uint256& txid);
/** Create bumpfee transaction based on feerate estimates.
*
* @param[in] wallet The wallet to use for this bumping
* @param[in] txid The txid of the transaction to bump
* @param[in] coin_control A CCoinControl object which provides feerates and other information used for coin selection
* @param[out] errors Errors
* @param[out] old_fee The fee the original transaction pays
* @param[out] new_fee the fee that the bump transaction pays
* @param[out] mtx The bump transaction itself
* @param[in] require_mine Whether the original transaction must consist of inputs that can be spent by the wallet
* @param[in] outputs Vector of new outputs to replace the bumped transaction's outputs
* @param[in] reduce_output The position of the change output to deduct the fee from in the transaction being bumped
*/
Result CreateRateBumpTransaction(CWallet& wallet,
const uint256& txid,
const CCoinControl& coin_control,
std::vector<bilingual_str>& errors,
CAmount& old_fee,
CAmount& new_fee,
CMutableTransaction& mtx,
bool require_mine,
const std::vector<CTxOut>& outputs,
std::optional<uint32_t> reduce_output = std::nullopt);
//! Sign the new transaction,
//! @return false if the tx couldn't be found or if it was
//! impossible to create the signature(s)
bool SignTransaction(CWallet& wallet, CMutableTransaction& mtx);
//! Commit the bumpfee transaction.
//! @return success in case of CWallet::CommitTransaction was successful,
//! but sets errors if the tx could not be added to the mempool (will try later)
//! or if the old transaction could not be marked as replaced.
Result CommitTransaction(CWallet& wallet,
const uint256& txid,
CMutableTransaction&& mtx,
std::vector<bilingual_str>& errors,
uint256& bumped_txid);
struct SignatureWeights
{
private:
int m_sigs_count{0};
int64_t m_sigs_weight{0};
public:
void AddSigWeight(const size_t weight, const SigVersion sigversion)
{
switch (sigversion) {
case SigVersion::BASE:
m_sigs_weight += weight * WITNESS_SCALE_FACTOR;
m_sigs_count += 1 * WITNESS_SCALE_FACTOR;
break;
case SigVersion::WITNESS_V0:
m_sigs_weight += weight;
m_sigs_count++;
break;
case SigVersion::TAPROOT:
case SigVersion::TAPSCRIPT:
assert(false);
}
}
int64_t GetWeightDiffToMax() const
{
// Note: the witness scaling factor is already accounted for because the count is multiplied by it.
return (/* max signature size=*/ 72 * m_sigs_count) - m_sigs_weight;
}
};
class SignatureWeightChecker : public DeferringSignatureChecker
{
private:
SignatureWeights& m_weights;
public:
SignatureWeightChecker(SignatureWeights& weights, const BaseSignatureChecker& checker) : DeferringSignatureChecker(checker), m_weights(weights) {}
bool CheckECDSASignature(const std::vector<unsigned char>& sig, const std::vector<unsigned char>& pubkey, const CScript& script, SigVersion sigversion) const override
{
if (m_checker.CheckECDSASignature(sig, pubkey, script, sigversion)) {
m_weights.AddSigWeight(sig.size(), sigversion);
return true;
}
return false;
}
};
} // namespace feebumper
} // namespace wallet
#endif // BITCOIN_WALLET_FEEBUMPER_H
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