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82 lines
2.5 KiB
Go
82 lines
2.5 KiB
Go
package chainfee
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import (
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"fmt"
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"github.com/btcsuite/btcd/blockchain"
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"github.com/btcsuite/btcd/btcutil"
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)
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const (
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// FeePerKwFloor is the lowest fee rate in sat/kw that we should use for
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// estimating transaction fees before signing.
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FeePerKwFloor SatPerKWeight = 253
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// AbsoluteFeePerKwFloor is the lowest fee rate in sat/kw of a
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// transaction that we should ever _create_. This is the the equivalent
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// of 1 sat/byte in sat/kw.
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AbsoluteFeePerKwFloor SatPerKWeight = 250
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)
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// SatPerVByte represents a fee rate in sat/vbyte.
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type SatPerVByte btcutil.Amount
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// FeePerKWeight converts the current fee rate from sat/vb to sat/kw.
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func (s SatPerVByte) FeePerKWeight() SatPerKWeight {
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return SatPerKWeight(s * 1000 / blockchain.WitnessScaleFactor)
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}
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// FeePerKVByte converts the current fee rate from sat/vb to sat/kvb.
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func (s SatPerVByte) FeePerKVByte() SatPerKVByte {
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return SatPerKVByte(s * 1000)
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}
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// String returns a human-readable string of the fee rate.
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func (s SatPerVByte) String() string {
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return fmt.Sprintf("%v sat/vb", int64(s))
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}
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// SatPerKVByte represents a fee rate in sat/kb.
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type SatPerKVByte btcutil.Amount
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// FeeForVSize calculates the fee resulting from this fee rate and the given
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// vsize in vbytes.
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func (s SatPerKVByte) FeeForVSize(vbytes int64) btcutil.Amount {
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return btcutil.Amount(s) * btcutil.Amount(vbytes) / 1000
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}
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// FeePerKWeight converts the current fee rate from sat/kb to sat/kw.
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func (s SatPerKVByte) FeePerKWeight() SatPerKWeight {
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return SatPerKWeight(s / blockchain.WitnessScaleFactor)
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}
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// String returns a human-readable string of the fee rate.
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func (s SatPerKVByte) String() string {
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return fmt.Sprintf("%v sat/kb", int64(s))
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}
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// SatPerKWeight represents a fee rate in sat/kw.
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type SatPerKWeight btcutil.Amount
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// FeeForWeight calculates the fee resulting from this fee rate and the given
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// weight in weight units (wu).
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func (s SatPerKWeight) FeeForWeight(wu int64) btcutil.Amount {
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// The resulting fee is rounded down, as specified in BOLT#03.
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return btcutil.Amount(s) * btcutil.Amount(wu) / 1000
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}
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// FeePerKVByte converts the current fee rate from sat/kw to sat/kb.
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func (s SatPerKWeight) FeePerKVByte() SatPerKVByte {
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return SatPerKVByte(s * blockchain.WitnessScaleFactor)
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}
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// FeePerVByte converts the current fee rate from sat/kw to sat/vb.
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func (s SatPerKWeight) FeePerVByte() SatPerVByte {
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return SatPerVByte(s * blockchain.WitnessScaleFactor / 1000)
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}
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// String returns a human-readable string of the fee rate.
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func (s SatPerKWeight) String() string {
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return fmt.Sprintf("%v sat/kw", int64(s))
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}
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