| 27 | } |
| 28 | |
| 29 | CFeeRate GetMinimumFeeRate(const CWallet& wallet, const CCoinControl& coin_control, FeeCalculation* feeCalc) |
| 30 | { |
| 31 | /* User control of how to calculate fee uses the following parameter precedence: |
| 32 | 1. coin_control.m_feerate |
| 33 | 2. coin_control.m_confirm_target |
| 34 | 3. m_confirm_target (user-set member variable of wallet) |
| 35 | The first parameter that is set is used. |
| 36 | */ |
| 37 | CFeeRate feerate_needed; |
| 38 | if (coin_control.m_feerate) { // 1. |
| 39 | feerate_needed = *(coin_control.m_feerate); |
| 40 | // Allow to override automatic min/max check over coin control instance |
| 41 | if (coin_control.fOverrideFeeRate) return feerate_needed; |
| 42 | } |
| 43 | else { // 2. or 3. |
| 44 | // We will use smart fee estimation |
| 45 | unsigned int target = coin_control.m_confirm_target ? *coin_control.m_confirm_target : wallet.m_confirm_target; |
| 46 | // By default estimates are economical iff we are signaling opt-in-RBF |
| 47 | bool conservative_estimate = !coin_control.m_signal_bip125_rbf.value_or(wallet.m_signal_rbf); |
| 48 | // Allow to override the default fee estimate mode over the CoinControl instance |
| 49 | if (coin_control.m_fee_mode == FeeEstimateMode::CONSERVATIVE) conservative_estimate = true; |
| 50 | else if (coin_control.m_fee_mode == FeeEstimateMode::ECONOMICAL) conservative_estimate = false; |
| 51 | |
| 52 | feerate_needed = wallet.chain().estimateSmartFee(target, conservative_estimate, feeCalc); |
| 53 | if (feerate_needed == CFeeRate(0)) { |
| 54 | // if we don't have enough data for estimateSmartFee, then use fallback fee |
| 55 | feerate_needed = wallet.m_fallback_fee; |
| 56 | if (feeCalc) feeCalc->reason = FeeReason::FALLBACK; |
| 57 | |
| 58 | // directly return if fallback fee is disabled (feerate 0 == disabled) |
| 59 | if (wallet.m_fallback_fee == CFeeRate(0)) return feerate_needed; |
| 60 | } |
| 61 | // Obey mempool min fee when using smart fee estimation |
| 62 | CFeeRate min_mempool_feerate = wallet.chain().mempoolMinFee(); |
| 63 | if (feerate_needed < min_mempool_feerate) { |
| 64 | feerate_needed = min_mempool_feerate; |
| 65 | if (feeCalc) feeCalc->reason = FeeReason::MEMPOOL_MIN; |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | // prevent user from paying a fee below the required fee rate |
| 70 | CFeeRate required_feerate = GetRequiredFeeRate(wallet); |
| 71 | if (required_feerate > feerate_needed) { |
| 72 | feerate_needed = required_feerate; |
| 73 | if (feeCalc) feeCalc->reason = FeeReason::REQUIRED; |
| 74 | } |
| 75 | return feerate_needed; |
| 76 | } |
| 77 | |
| 78 | CFeeRate GetDiscardRate(const CWallet& wallet) |
| 79 | { |
no test coverage detected