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lnwallet: update WitnessType names to be more descriptive

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In this commit, we rename several of the existing WitnessType
definitions to be more descriptive than they were previously. We also
add a number of additional types which we need to handle scripts for,
but weren’t yet added before. Finally, we modify the
receiverHtlcSpendTimeout to optionally take an additional parameter to
set the locktime of the spending transaction accordingly. This final
modification allows the caller to specify that the lock time has
already been set on the main transaction.
This commit is contained in:
Olaoluwa Osuntokun
2018-01-16 17:59:43 -08:00
parent 3fa0cde631
commit ff872b798c
3 changed files with 71 additions and 29 deletions
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19
lnwallet/script_utils.go
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@@ -573,17 +573,24 @@ func ReceiverHtlcSpendRevoke(signer Signer, signDesc *SignDescriptor,
// receiverHtlcSpendTimeout constructs a valid witness allowing the sender of
// an HTLC to recover the pending funds after an absolute timeout in the
// scenario that the receiver of the HTLC broadcasts their version of the
// commitment transaction.
// commitment transaction. If the caller has already set the lock time on the
// spending transaction, than a value of -1 can be passed for the cltvExipiry
// value.
//
// NOTE: The target input of the passed transaction MUST NOT have a final
// sequence number. Otherwise, the OP_CHECKLOCKTIMEVERIFY check will fail.
func receiverHtlcSpendTimeout(signer Signer, signDesc *SignDescriptor,
sweepTx *wire.MsgTx, cltvExpiry uint32) (wire.TxWitness, error) {
sweepTx *wire.MsgTx, cltvExpiry int32) (wire.TxWitness, error) {
// The HTLC output has an absolute time period before we are permitted
// to recover the pending funds. Therefore we need to set the locktime
// on this sweeping transaction in order to pass Script verification.
sweepTx.LockTime = cltvExpiry
// If the caller set a proper timeout value, then we'll apply it
// directly to the transaction.
if cltvExpiry != -1 {
// The HTLC output has an absolute time period before we are
// permitted to recover the pending funds. Therefore we need to
// set the locktime on this sweeping transaction in order to
// pass Script verification.
sweepTx.LockTime = uint32(cltvExpiry)
}
// With the lock time on the transaction set, we'll not generate a
// signature for the sweep transaction. The passed sign descriptor