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https://github.com/lightninglabs/loop.git
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d554b42ef6
Update LND, Aperture, and Taproot Assets to revisions using the btcd v2 modules, and update lndclient to v0.21.0-3. Migrate Loop chain, transaction, and address types to their corresponding v2 packages. The lndclient release includes the migration from: https://github.com/lightninglabs/lndclient/pull/280 Taproot Assets is temporarily replaced with its btcd v2 revision because the v0.8 release branch has not adopted the new modules. This raises the minimum Go version to 1.26 and changes exported address types.
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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