102 lines
4.5 KiB
C++
102 lines
4.5 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2018 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 <util/system.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(const CWallet& wallet, unsigned int nTxBytes)
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{
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return GetRequiredFeeRate(wallet).GetFee(nTxBytes);
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}
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CAmount GetMinimumFee(const CWallet& wallet, unsigned int nTxBytes, const CCoinControl& coin_control, FeeCalculation* feeCalc)
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{
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CAmount fee_needed = GetMinimumFeeRate(wallet, coin_control, feeCalc).GetFee(nTxBytes);
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// Always obey the maximum
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const CAmount max_tx_fee = wallet.chain().maxTxFee();
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if (fee_needed > max_tx_fee) {
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fee_needed = max_tx_fee;
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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 GetRequiredFeeRate(const CWallet& wallet)
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{
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return std::max(wallet.m_min_fee, wallet.chain().relayMinFee());
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}
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CFeeRate GetMinimumFeeRate(const CWallet& wallet, const CCoinControl& coin_control, 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. m_pay_tx_fee (user-set member variable of wallet)
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4. m_confirm_target (user-set member variable of wallet)
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The first parameter that is set is used.
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*/
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CFeeRate feerate_needed;
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if (coin_control.m_feerate) { // 1.
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feerate_needed = *(coin_control.m_feerate);
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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 feerate_needed;
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}
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else if (!coin_control.m_confirm_target && wallet.m_pay_tx_fee != CFeeRate(0)) { // 3. TODO: remove magic value of 0 for wallet member m_pay_tx_fee
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feerate_needed = wallet.m_pay_tx_fee;
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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 : wallet.m_confirm_target;
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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.m_signal_bip125_rbf.get_value_or(wallet.m_signal_rbf);
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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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feerate_needed = wallet.chain().estimateSmartFee(target, conservative_estimate, feeCalc);
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if (feerate_needed == CFeeRate(0)) {
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// if we don't have enough data for estimateSmartFee, then use fallback fee
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feerate_needed = wallet.m_fallback_fee;
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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 (wallet.m_fallback_fee == CFeeRate(0)) return feerate_needed;
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}
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// Obey mempool min fee when using smart fee estimation
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CFeeRate min_mempool_feerate = wallet.chain().mempoolMinFee();
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if (feerate_needed < min_mempool_feerate) {
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feerate_needed = min_mempool_feerate;
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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 the required fee rate
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CFeeRate required_feerate = GetRequiredFeeRate(wallet);
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if (required_feerate > feerate_needed) {
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feerate_needed = required_feerate;
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if (feeCalc) feeCalc->reason = FeeReason::REQUIRED;
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}
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return feerate_needed;
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}
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CFeeRate GetDiscardRate(const CWallet& wallet)
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{
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unsigned int highest_target = wallet.chain().estimateMaxBlocks();
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CFeeRate discard_rate = wallet.chain().estimateSmartFee(highest_target, 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)) ? wallet.m_discard_rate : std::min(discard_rate, wallet.m_discard_rate);
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// Discard rate must be at least dustRelayFee
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discard_rate = std::max(discard_rate, wallet.chain().relayDustFee());
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return discard_rate;
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}
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