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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2017 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <wallet/fees.h>
#include <policy/policy.h>
#include <txmempool.h>
#include <util.h>
#include <validation.h>
#include <wallet/coincontrol.h>
#include <wallet/wallet.h>
CAmount GetRequiredFee(unsigned int nTxBytes)
{
return std::max(CWallet::minTxFee.GetFee(nTxBytes), ::minRelayTxFee.GetFee(nTxBytes));
}
CAmount GetMinimumFee(unsigned int nTxBytes, const CCoinControl& coin_control, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, FeeCalculation *feeCalc)
{
/* User control of how to calculate fee uses the following parameter precedence:
1. coin_control.m_feerate
2. coin_control.m_confirm_target
3. payTxFee (user-set global variable)
4. nTxConfirmTarget (user-set global variable)
The first parameter that is set is used.
*/
CAmount fee_needed;
if (coin_control.m_feerate) { // 1.
fee_needed = coin_control.m_feerate->GetFee(nTxBytes);
if (feeCalc) feeCalc->reason = FeeReason::PAYTXFEE;
// Allow to override automatic min/max check over coin control instance
if (coin_control.fOverrideFeeRate) return fee_needed;
}
else if (!coin_control.m_confirm_target && ::payTxFee != CFeeRate(0)) { // 3. TODO: remove magic value of 0 for global payTxFee
fee_needed = ::payTxFee.GetFee(nTxBytes);
if (feeCalc) feeCalc->reason = FeeReason::PAYTXFEE;
}
else { // 2. or 4.
// We will use smart fee estimation
unsigned int target = coin_control.m_confirm_target ? *coin_control.m_confirm_target : ::nTxConfirmTarget;
// By default estimates are economical iff we are signaling opt-in-RBF
bool conservative_estimate = !coin_control.signalRbf;
// Allow to override the default fee estimate mode over the CoinControl instance
if (coin_control.m_fee_mode == FeeEstimateMode::CONSERVATIVE) conservative_estimate = true;
else if (coin_control.m_fee_mode == FeeEstimateMode::ECONOMICAL) conservative_estimate = false;
fee_needed = estimator.estimateSmartFee(target, feeCalc, conservative_estimate).GetFee(nTxBytes);
if (fee_needed == 0) {
// if we don't have enough data for estimateSmartFee, then use fallbackFee
fee_needed = CWallet::fallbackFee.GetFee(nTxBytes);
if (feeCalc) feeCalc->reason = FeeReason::FALLBACK;
}
// Obey mempool min fee when using smart fee estimation
CAmount min_mempool_fee = pool.GetMinFee(gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFee(nTxBytes);
if (fee_needed < min_mempool_fee) {
fee_needed = min_mempool_fee;
if (feeCalc) feeCalc->reason = FeeReason::MEMPOOL_MIN;
}
}
// prevent user from paying a fee below minRelayTxFee or minTxFee
CAmount required_fee = GetRequiredFee(nTxBytes);
if (required_fee > fee_needed) {
fee_needed = required_fee;
if (feeCalc) feeCalc->reason = FeeReason::REQUIRED;
}
// But always obey the maximum
if (fee_needed > maxTxFee) {
fee_needed = maxTxFee;
if (feeCalc) feeCalc->reason = FeeReason::MAXTXFEE;
}
return fee_needed;
}
CFeeRate GetDiscardRate(const CBlockPolicyEstimator& estimator)
{
unsigned int highest_target = estimator.HighestTargetTracked(FeeEstimateHorizon::LONG_HALFLIFE);
CFeeRate discard_rate = estimator.estimateSmartFee(highest_target, nullptr /* FeeCalculation */, false /* conservative */);
// Don't let discard_rate be greater than longest possible fee estimate if we get a valid fee estimate
discard_rate = (discard_rate == CFeeRate(0)) ? CWallet::m_discard_rate : std::min(discard_rate, CWallet::m_discard_rate);
// Discard rate must be at least dustRelayFee
discard_rate = std::max(discard_rate, ::dustRelayFee);
return discard_rate;
}
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