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watchtower/lookout: use correct to-local-penalty size for anchors

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This commit fixes the to-local-witness estimate to use the correct
witness size estimate for anchor channels. We retain the off-by-one bug
from the original constant otherwise.
This commit is contained in:
Conner Fromknecht 2020-09-15 12:48:23 -04:00
parent d440cc4024
commit a0e54a9650
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GPG Key ID: E7D737B67FA592C7
2 changed files with 14 additions and 4 deletions
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9
watchtower/lookout/justice_descriptor.go
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@ -284,8 +284,13 @@ func (p *JusticeDescriptor) CreateJusticeTxn() (*wire.MsgTx, error) {
// An older ToLocalPenaltyWitnessSize constant used to underestimate the
// size by one byte. The diferrence in weight can cause different output
// values on the sweep transaction, so we mimic the original bug to
// avoid invalidating signatures by older clients.
weightEstimate.AddWitnessInput(input.ToLocalPenaltyWitnessSize - 1)
// avoid invalidating signatures by older clients. For anchor channels
// we correct this and use the correct witness size.
if p.JusticeKit.BlobType.IsAnchorChannel() {
weightEstimate.AddWitnessInput(input.ToLocalPenaltyWitnessSize)
} else {
weightEstimate.AddWitnessInput(input.ToLocalPenaltyWitnessSize - 1)
}
sweepInputs = append(sweepInputs, toLocalInput)

9
watchtower/lookout/justice_descriptor_test.go
View File

@ -192,8 +192,13 @@ func testJusticeDescriptor(t *testing.T, blobType blob.Type) {
// An older ToLocalPenaltyWitnessSize constant used to underestimate the
// size by one byte. The diferrence in weight can cause different output
// values on the sweep transaction, so we mimic the original bug and
// create signatures using the original weight estimate.
weightEstimate.AddWitnessInput(input.ToLocalPenaltyWitnessSize - 1)
// create signatures using the original weight estimate. For anchor
// channels we fix this and use the correct witness size.
if isAnchorChannel {
weightEstimate.AddWitnessInput(input.ToLocalPenaltyWitnessSize)
} else {
weightEstimate.AddWitnessInput(input.ToLocalPenaltyWitnessSize - 1)
}
if isAnchorChannel {
weightEstimate.AddWitnessInput(input.ToRemoteConfirmedWitnessSize)