69 lines
2.0 KiB
Go
69 lines
2.0 KiB
Go
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package sweep
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import (
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"fmt"
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"github.com/lightningnetwork/lnd/lnwallet"
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)
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// FeePreference allows callers to express their time value for inclusion of a
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// transaction into a block via either a confirmation target, or a fee rate.
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type FeePreference struct {
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// ConfTarget if non-zero, signals a fee preference expressed in the
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// number of desired blocks between first broadcast, and confirmation.
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ConfTarget uint32
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// FeeRate if non-zero, signals a fee pre fence expressed in the fee
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// rate expressed in sat/kw for a particular transaction.
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FeeRate lnwallet.SatPerKWeight
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}
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// DetermineFeePerKw will determine the fee in sat/kw that should be paid given
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// an estimator, a confirmation target, and a manual value for sat/byte. A
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// value is chosen based on the two free parameters as one, or both of them can
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// be zero.
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func DetermineFeePerKw(feeEstimator lnwallet.FeeEstimator,
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feePref FeePreference) (lnwallet.SatPerKWeight, error) {
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switch {
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// If the target number of confirmations is set, then we'll use that to
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// consult our fee estimator for an adequate fee.
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case feePref.ConfTarget != 0:
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feePerKw, err := feeEstimator.EstimateFeePerKW(
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uint32(feePref.ConfTarget),
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)
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if err != nil {
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return 0, fmt.Errorf("unable to query fee "+
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"estimator: %v", err)
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}
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return feePerKw, nil
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// If a manual sat/byte fee rate is set, then we'll use that directly.
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// We'll need to convert it to sat/kw as this is what we use
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// internally.
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case feePref.FeeRate != 0:
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feePerKW := feePref.FeeRate
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if feePerKW < lnwallet.FeePerKwFloor {
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log.Infof("Manual fee rate input of %d sat/kw is "+
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"too low, using %d sat/kw instead", feePerKW,
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lnwallet.FeePerKwFloor)
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feePerKW = lnwallet.FeePerKwFloor
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}
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return feePerKW, nil
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// Otherwise, we'll attempt a relaxed confirmation target for the
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// transaction
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default:
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feePerKw, err := feeEstimator.EstimateFeePerKW(6)
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if err != nil {
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return 0, fmt.Errorf("unable to query fee estimator: "+
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"%v", err)
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}
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return feePerKw, nil
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}
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}
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