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https://github.com/lightninglabs/loop.git
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0ee07198f6
Include https://github.com/lightninglabs/lndclient/pull/280 multi: migrate to btcd v2 modules + add WalletKit.SubmitPackage Migrate Loop imports and update Aperture and Taproot Assets to compatible revisions so this commit remains green on its own.
44 lines
1.2 KiB
Go
44 lines
1.2 KiB
Go
package utils
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import (
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"fmt"
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"github.com/btcsuite/btcd/btcutil/v2"
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"github.com/lightningnetwork/lnd/lntypes"
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"github.com/lightningnetwork/lnd/lnwallet/chainfee"
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)
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const (
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// MaxFeeToAmountRatio is the maximum fee to total amount ratio allowed
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// for a sweep transaction.
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MaxFeeToAmountRatio = 0.2
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)
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// ClampSweepFee caps a fee to a percentage of the provided total amount and
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// verifies the resulting fee rate is not below the minimum relay fee. It
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// returns the clamped fee, whether it was clamped, or an error if the clamped
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// fee would fall below the minimum relay fee.
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func ClampSweepFee(fee btcutil.Amount, totalAmount btcutil.Amount,
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ratio float64, minRelayFeeRate chainfee.SatPerKWeight,
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weight lntypes.WeightUnit) (btcutil.Amount, bool, error) {
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maxFeeAmount := btcutil.Amount(float64(totalAmount) * ratio)
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clampedFee := fee
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clamped := false
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if fee > maxFeeAmount {
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clampedFee = maxFeeAmount
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clamped = true
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}
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if minRelayFeeRate > 0 {
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clampedFeeRate := chainfee.NewSatPerKWeight(clampedFee, weight)
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if clampedFeeRate < minRelayFeeRate {
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return 0, clamped, fmt.Errorf("clamped fee rate %v is "+
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"less than minimum relay fee %v",
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clampedFeeRate, minRelayFeeRate)
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}
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}
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return clampedFee, clamped, nil
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}
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