Branch data     Line data    Source code

       1                 :             : // Copyright (c) 2009-2010 Satoshi Nakamoto
       2                 :             : // Copyright (c) 2009-present The Bitcoin Core developers
       3                 :             : // Distributed under the MIT software license, see the accompanying
       4                 :             : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
       5                 :             : 
       6                 :             : #include <wallet/fees.h>
       7                 :             : 
       8                 :             : #include <policy/feerate.h>
       9                 :             : #include <util/fees.h>
      10                 :             : #include <wallet/coincontrol.h>
      11                 :             : #include <wallet/wallet.h>
      12                 :             : 
      13                 :             : #include <optional>
      14                 :             : 
      15                 :             : namespace wallet {
      16                 :         153 : CAmount GetRequiredFee(const CWallet& wallet, unsigned int nTxBytes)
      17                 :             : {
      18                 :         153 :     return GetRequiredFeeRate(wallet).GetFee(static_cast<int32_t>(nTxBytes));
      19                 :             : }
      20                 :             : 
      21                 :             : 
      22                 :         153 : CAmount GetMinimumFee(const MinimumFeeRateResult& min_fee_rate, unsigned int nTxBytes)
      23                 :             : {
      24                 :         153 :     return min_fee_rate.fee_rate.GetFee(static_cast<int32_t>(nTxBytes));
      25                 :             : }
      26                 :             : 
      27                 :         593 : CFeeRate GetRequiredFeeRate(const CWallet& wallet)
      28                 :             : {
      29                 :         593 :     return std::max(wallet.m_min_fee, wallet.chain().relayMinFee());
      30                 :             : }
      31                 :             : 
      32                 :        1563 : MinimumFeeRateResult GetMinimumFeeRate(const CWallet& wallet, const CCoinControl& coin_control)
      33                 :             : {
      34                 :             :     /* User control of how to calculate fee uses the following parameter precedence:
      35                 :             :        1. coin_control.m_feerate
      36                 :             :        2. coin_control.m_confirm_target
      37                 :             :        3. m_confirm_target (user-set member variable of wallet)
      38                 :             :        The first parameter that is set is used.
      39                 :             :     */
      40         [ +  + ]:        1563 :     if (coin_control.m_feerate) { // 1.
      41         [ +  + ]:        1237 :         CFeeRate fee_rate{*coin_control.m_feerate};
      42                 :             :         // Allow to override automatic min/max check over coin control instance
      43         [ +  + ]:        1237 :         if (coin_control.fOverrideFeeRate) return {fee_rate, FeeReason::USER_SPECIFIED, std::nullopt};
      44                 :             : 
      45                 :         275 :         CFeeRate required_feerate = GetRequiredFeeRate(wallet);
      46         [ +  + ]:         275 :         if (required_feerate > fee_rate) return {required_feerate, FeeReason::REQUIRED, std::nullopt};
      47                 :             : 
      48                 :         260 :         return {fee_rate, FeeReason::USER_SPECIFIED, std::nullopt};
      49                 :             :     }
      50                 :             : 
      51                 :             :     // We will use smart fee estimation
      52         [ +  + ]:         326 :     unsigned int target = coin_control.m_confirm_target ? *coin_control.m_confirm_target : wallet.m_confirm_target;
      53                 :             :     // By default estimates are economical iff we are signaling opt-in-RBF
      54         [ -  + ]:         326 :     bool conservative_estimate = !coin_control.m_signal_bip125_rbf.value_or(wallet.m_signal_rbf);
      55                 :             :     // Allow to override the default fee estimate mode over the CoinControl instance
      56         [ +  + ]:         326 :     if (coin_control.m_fee_mode == FeeEstimateMode::CONSERVATIVE)
      57                 :             :         conservative_estimate = true;
      58         [ +  + ]:         325 :     else if (coin_control.m_fee_mode == FeeEstimateMode::ECONOMICAL)
      59                 :           3 :         conservative_estimate = false;
      60                 :             : 
      61                 :         326 :     const auto fee_estimation_res = wallet.chain().getFeeRateEstimate(target, conservative_estimate);
      62                 :         326 :     const FeeRateEstimation& estimation{FeeRateEstimationRef(fee_estimation_res)};
      63         [ +  + ]:         326 :     CFeeRate fee_rate{estimation.feerate};
      64                 :         326 :     FeeReason fee_reason{FeeReason::FEE_RATE_ESTIMATOR};
      65                 :             :     // Only fee rate estimator results have a returned target.
      66         [ +  + ]:         326 :     std::optional<int> returned_target{estimation.returned_target};
      67         [ +  + ]:         326 :     if (fee_rate == CFeeRate(0)) {
      68                 :             :         // if we don't have enough data for getFeeRateEstimate, then use fallback fee
      69                 :         324 :         fee_rate = wallet.m_fallback_fee;
      70                 :         324 :         fee_reason = FeeReason::FALLBACK;
      71         [ +  + ]:         324 :         returned_target = std::nullopt;
      72                 :             :         // directly return if fallback fee is disabled (feerate 0 == disabled)
      73         [ +  + ]:         324 :         if (wallet.m_fallback_fee == CFeeRate(0)) return {fee_rate, FeeReason::FALLBACK, std::nullopt};
      74                 :             :     }
      75                 :             : 
      76                 :             :     // Obey mempool min fee when using smart fee estimation or fallback fee
      77         [ +  - ]:          12 :     CFeeRate min_mempool_feerate = wallet.chain().mempoolMinFee();
      78         [ +  + ]:          12 :     if (fee_rate < min_mempool_feerate) {
      79                 :           4 :         fee_rate = min_mempool_feerate;
      80                 :           4 :         fee_reason = FeeReason::MEMPOOL_MIN;
      81         [ -  + ]:           4 :         returned_target = std::nullopt;
      82                 :             :     }
      83                 :             : 
      84         [ +  - ]:          12 :     CFeeRate required_feerate = GetRequiredFeeRate(wallet);
      85         [ +  + ]:          12 :     if (required_feerate > fee_rate) return {required_feerate, FeeReason::REQUIRED, std::nullopt};
      86                 :             : 
      87                 :          10 :     return {fee_rate, fee_reason, returned_target};
      88                 :         326 : }
      89                 :             : 
      90                 :        1563 : CFeeRate GetDiscardRate(const CWallet& wallet)
      91                 :             : {
      92                 :        1563 :     unsigned int highest_target = wallet.chain().maximumFeeEstimationTargetBlocks();
      93                 :        1563 :     const auto res = wallet.chain().getFeeRateEstimate(highest_target, /*conservative=*/false);
      94   [ +  +  +  - ]:        1716 :     auto discard_rate = res ? CFeeRate(res->feerate) : CFeeRate(0);
      95                 :             :     // Don't let discard_rate be greater than longest possible fee estimate if we get a valid fee estimate
      96         [ +  + ]:        1563 :     discard_rate = (discard_rate == CFeeRate(0)) ? wallet.m_discard_rate : std::min(discard_rate, wallet.m_discard_rate);
      97                 :             :     // Discard rate must be at least dust relay feerate
      98         [ +  - ]:        1563 :     discard_rate = std::max(discard_rate, wallet.chain().relayDustFee());
      99                 :        1563 :     return discard_rate;
     100                 :        1563 : }
     101                 :             : } // namespace wallet