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93 lines
4.1 KiB
C++
93 lines
4.1 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2017 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <wallet/fees.h>
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#include <policy/policy.h>
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#include <txmempool.h>
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#include <util.h>
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#include <validation.h>
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#include <wallet/coincontrol.h>
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#include <wallet/wallet.h>
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CAmount GetRequiredFee(unsigned int nTxBytes)
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{
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return std::max(CWallet::minTxFee.GetFee(nTxBytes), ::minRelayTxFee.GetFee(nTxBytes));
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}
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CAmount GetMinimumFee(unsigned int nTxBytes, const CCoinControl& coin_control, const CTxMemPool& pool, const CBlockPolicyEstimator& estimator, FeeCalculation *feeCalc)
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{
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/* User control of how to calculate fee uses the following parameter precedence:
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1. coin_control.m_feerate
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2. coin_control.m_confirm_target
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3. payTxFee (user-set global variable)
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4. nTxConfirmTarget (user-set global variable)
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The first parameter that is set is used.
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*/
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CAmount fee_needed;
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if (coin_control.m_feerate) { // 1.
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fee_needed = coin_control.m_feerate->GetFee(nTxBytes);
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if (feeCalc) feeCalc->reason = FeeReason::PAYTXFEE;
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// Allow to override automatic min/max check over coin control instance
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if (coin_control.fOverrideFeeRate) return fee_needed;
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}
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else if (!coin_control.m_confirm_target && ::payTxFee != CFeeRate(0)) { // 3. TODO: remove magic value of 0 for global payTxFee
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fee_needed = ::payTxFee.GetFee(nTxBytes);
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if (feeCalc) feeCalc->reason = FeeReason::PAYTXFEE;
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}
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else { // 2. or 4.
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// We will use smart fee estimation
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unsigned int target = coin_control.m_confirm_target ? *coin_control.m_confirm_target : ::nTxConfirmTarget;
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// By default estimates are economical iff we are signaling opt-in-RBF
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bool conservative_estimate = !coin_control.signalRbf;
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// Allow to override the default fee estimate mode over the CoinControl instance
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if (coin_control.m_fee_mode == FeeEstimateMode::CONSERVATIVE) conservative_estimate = true;
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else if (coin_control.m_fee_mode == FeeEstimateMode::ECONOMICAL) conservative_estimate = false;
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fee_needed = estimator.estimateSmartFee(target, feeCalc, conservative_estimate).GetFee(nTxBytes);
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if (fee_needed == 0) {
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// if we don't have enough data for estimateSmartFee, then use fallbackFee
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fee_needed = CWallet::fallbackFee.GetFee(nTxBytes);
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if (feeCalc) feeCalc->reason = FeeReason::FALLBACK;
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// directly return if fallback fee is disabled (feerate 0 == disabled)
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if (CWallet::fallbackFee.GetFee(1000) == 0) return fee_needed;
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}
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// Obey mempool min fee when using smart fee estimation
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CAmount min_mempool_fee = pool.GetMinFee(gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000).GetFee(nTxBytes);
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if (fee_needed < min_mempool_fee) {
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fee_needed = min_mempool_fee;
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if (feeCalc) feeCalc->reason = FeeReason::MEMPOOL_MIN;
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}
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}
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// prevent user from paying a fee below minRelayTxFee or minTxFee
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CAmount required_fee = GetRequiredFee(nTxBytes);
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if (required_fee > fee_needed) {
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fee_needed = required_fee;
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if (feeCalc) feeCalc->reason = FeeReason::REQUIRED;
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}
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// But always obey the maximum
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if (fee_needed > maxTxFee) {
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fee_needed = maxTxFee;
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if (feeCalc) feeCalc->reason = FeeReason::MAXTXFEE;
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}
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return fee_needed;
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}
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CFeeRate GetDiscardRate(const CBlockPolicyEstimator& estimator)
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{
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unsigned int highest_target = estimator.HighestTargetTracked(FeeEstimateHorizon::LONG_HALFLIFE);
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CFeeRate discard_rate = estimator.estimateSmartFee(highest_target, nullptr /* FeeCalculation */, false /* conservative */);
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// Don't let discard_rate be greater than longest possible fee estimate if we get a valid fee estimate
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discard_rate = (discard_rate == CFeeRate(0)) ? CWallet::m_discard_rate : std::min(discard_rate, CWallet::m_discard_rate);
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// Discard rate must be at least dustRelayFee
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discard_rate = std::max(discard_rate, ::dustRelayFee);
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return discard_rate;
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}
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