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lnwallet: detect and handle noop HTLCs

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We update the lightning channel state machine in some key areas. If the
noop TLV is set in the update_add_htlc custom records then we change the
entry type to noop. When settling the HTLC if the type is noop we credit
the satoshi amount back to the sender.
This commit is contained in:
George Tsagkarelis
2025-05-27 13:34:10 +02:00
committed by Oliver Gugger
parent c9d8e41e34
commit 776df9159e
3 changed files with 198 additions and 19 deletions
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17
lnwallet/aux_signer.go
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@@ -10,9 +10,20 @@ import (
"github.com/lightningnetwork/lnd/tlv"
)
// htlcCustomSigType is the TLV type that is used to encode the custom HTLC
// signatures within the custom data for an existing HTLC.
var htlcCustomSigType tlv.TlvType65543
var (
// htlcCustomSigType is the TLV type that is used to encode the custom
// HTLC signatures within the custom data for an existing HTLC.
htlcCustomSigType tlv.TlvType65543
// NoOpHtlcTLVEntry is the TLV that that's used in the update_add_htlc
// message to indicate the presence of a noop HTLC. This has no encoded
// value, its presence is used to indicate that the HTLC is a noop.
NoOpHtlcTLVEntry tlv.TlvType65544
)
// NoOpHtlcTLVType is the (golang) type of the TLV record that's used to signal
// that an HTLC should be a noop HTLC.
type NoOpHtlcTLVType = tlv.TlvType65544
// AuxHtlcView is a struct that contains a safe copy of an HTLC view that can
// be used by aux components.