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channeldb+lnwallet: define zero-fee channel type

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This commit is contained in:
Johan T. Halseth 2020-12-07 14:14:20 +01:00
parent abefa93065
commit d5cd9861d2
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GPG key ID: 15BAADA29DA20D26
2 changed files with 22 additions and 0 deletions
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10
channeldb/channel.go
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@ -244,6 +244,10 @@ const (
// that only the responder can decide to cooperatively close the // that only the responder can decide to cooperatively close the
// channel. // channel.
FrozenBit ChannelType = 1 << 4 FrozenBit ChannelType = 1 << 4
// ZeroHtlcTxFeeBit indicates that the channel should use zero-fee
// second-level HTLC transactions.
ZeroHtlcTxFeeBit ChannelType = 1 << 5
) )
// IsSingleFunder returns true if the channel type if one of the known single // IsSingleFunder returns true if the channel type if one of the known single
@ -275,6 +279,12 @@ func (c ChannelType) HasAnchors() bool {
return c&AnchorOutputsBit == AnchorOutputsBit return c&AnchorOutputsBit == AnchorOutputsBit
} }
// ZeroHtlcTxFee returns true if this channel type uses second-level HTLC
// transactions signed with zero-fee.
func (c ChannelType) ZeroHtlcTxFee() bool {
return c&ZeroHtlcTxFeeBit == ZeroHtlcTxFeeBit
}
// IsFrozen returns true if the channel is considered to be "frozen". A frozen // IsFrozen returns true if the channel is considered to be "frozen". A frozen
// channel means that only the responder can initiate a cooperative channel // channel means that only the responder can initiate a cooperative channel
// closure. // closure.

12
lnwallet/commitment.go
View file

@ -278,6 +278,12 @@ func CommitWeight(chanType channeldb.ChannelType) int64 {
func HtlcTimeoutFee(chanType channeldb.ChannelType, func HtlcTimeoutFee(chanType channeldb.ChannelType,
feePerKw chainfee.SatPerKWeight) btcutil.Amount { feePerKw chainfee.SatPerKWeight) btcutil.Amount {
// For zero-fee HTLC channels, this will always be zero, regardless of
// feerate.
if chanType.ZeroHtlcTxFee() {
return 0
}
if chanType.HasAnchors() { if chanType.HasAnchors() {
return feePerKw.FeeForWeight(input.HtlcTimeoutWeightConfirmed) return feePerKw.FeeForWeight(input.HtlcTimeoutWeightConfirmed)
} }
@ -290,6 +296,12 @@ func HtlcTimeoutFee(chanType channeldb.ChannelType,
func HtlcSuccessFee(chanType channeldb.ChannelType, func HtlcSuccessFee(chanType channeldb.ChannelType,
feePerKw chainfee.SatPerKWeight) btcutil.Amount { feePerKw chainfee.SatPerKWeight) btcutil.Amount {
// For zero-fee HTLC channels, this will always be zero, regardless of
// feerate.
if chanType.ZeroHtlcTxFee() {
return 0
}
if chanType.HasAnchors() { if chanType.HasAnchors() {
return feePerKw.FeeForWeight(input.HtlcSuccessWeightConfirmed) return feePerKw.FeeForWeight(input.HtlcSuccessWeightConfirmed)
} }