git / moonbite-core / src/wallet/fees.cpp · raw

// Copyright (c) 2009-2010 Satoshi Nakamoto// Copyright (c) 2009-2019 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 <wallet/coincontrol.h>#include <wallet/wallet.h>CAmount GetRequiredFee(const CWallet& wallet, unsigned int nTxBytes, uint64_t mweb_weight){    return GetRequiredFeeRate(wallet).GetTotalFee(nTxBytes, mweb_weight);}CAmount GetMinimumFee(const CWallet& wallet, unsigned int nTxBytes, uint64_t mweb_weight, const CCoinControl& coin_control, FeeCalculation* feeCalc){    return GetMinimumFeeRate(wallet, coin_control, feeCalc).GetTotalFee(nTxBytes, mweb_weight);}CFeeRate GetRequiredFeeRate(const CWallet& wallet){    return std::max(wallet.m_min_fee, wallet.chain().relayMinFee());}CFeeRate GetMinimumFeeRate(const CWallet& wallet, const CCoinControl& coin_control, 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. m_pay_tx_fee (user-set member variable of wallet)       4. m_confirm_target (user-set member variable of wallet)       The first parameter that is set is used.    */    CFeeRate feerate_needed;    if (coin_control.m_feerate) { // 1.        feerate_needed = *(coin_control.m_feerate);        if (feeCalc) feeCalc->reason = FeeReason::PAYTXFEE;        // Allow to override automatic min/max check over coin control instance        if (coin_control.fOverrideFeeRate) return feerate_needed;    }    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        feerate_needed = wallet.m_pay_tx_fee;        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 : wallet.m_confirm_target;        // By default estimates are economical iff we are signaling opt-in-RBF        bool conservative_estimate = !coin_control.m_signal_bip125_rbf.get_value_or(wallet.m_signal_rbf);        // 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;        feerate_needed = wallet.chain().estimateSmartFee(target, conservative_estimate, feeCalc);        if (feerate_needed == CFeeRate(0)) {            // if we don't have enough data for estimateSmartFee, then use fallback fee            feerate_needed = wallet.m_fallback_fee;            if (feeCalc) feeCalc->reason = FeeReason::FALLBACK;            // directly return if fallback fee is disabled (feerate 0 == disabled)            if (wallet.m_fallback_fee == CFeeRate(0)) return feerate_needed;        }        // Obey mempool min fee when using smart fee estimation        CFeeRate min_mempool_feerate = wallet.chain().mempoolMinFee();        if (feerate_needed < min_mempool_feerate) {            feerate_needed = min_mempool_feerate;            if (feeCalc) feeCalc->reason = FeeReason::MEMPOOL_MIN;        }    }    // prevent user from paying a fee below the required fee rate    CFeeRate required_feerate = GetRequiredFeeRate(wallet);    if (required_feerate > feerate_needed) {        feerate_needed = required_feerate;        if (feeCalc) feeCalc->reason = FeeReason::REQUIRED;    }    return feerate_needed;}CFeeRate GetDiscardRate(const CWallet& wallet){    unsigned int highest_target = wallet.chain().estimateMaxBlocks();    CFeeRate discard_rate = wallet.chain().estimateSmartFee(highest_target, 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)) ? wallet.m_discard_rate : std::min(discard_rate, wallet.m_discard_rate);    // Discard rate must be at least dustRelayFee    discard_rate = std::max(discard_rate, wallet.chain().relayDustFee());    return discard_rate;}