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89 lines
4.0 KiB
89 lines
4.0 KiB
// 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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} |
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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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