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loopdb: refactor the SwapContract to hold all HTLC keys

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This commit adds a new struct to hold all HTLC keys and refactors the
SwapContract which is used by both loopin and loopout swaps to use this
new struct. The newly added internal keys will for now hold the script
keys to keep everything equivalent but are already stored and read back
if the protocol version is set to MuSig2.
This commit is contained in:
Andras Banki-Horvath 2023-01-05 18:16:05 +01:00
parent cc5e26b9c9
commit da4bcbea10
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GPG key ID: 80E5375C094198D8
11 changed files with 273 additions and 115 deletions
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39
loopdb/loop.go
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@ -10,6 +10,31 @@ import (
"github.com/lightningnetwork/lnd/lntypes"
)
// HtlcKeys is a holder of all keys used when constructing the swap HTLC. Since
// it's used for both loop in and loop out swaps it may hold partial information
// about the sender or receiver depending on the swap type.
type HtlcKeys struct {
// SenderScriptKey is the sender's public key that is used in the HTLC,
// specifically when constructing the script spend scripts.
SenderScriptKey [33]byte
// SenderInternalPubKey is the sender's internal pubkey that is used in
// taproot HTLCs as part of the aggregate internal key.
SenderInternalPubKey [33]byte
// ReceiverScriptKey is the receiver's public key that is used in the
// HTLC, specifically when constructing the script spend scripts.
ReceiverScriptKey [33]byte
// ReceiverInternalPubKey is the sender's internal pubkey that is used
// in taproot HTLCs as part of the aggregate internal key.
ReceiverInternalPubKey [33]byte
// ClientScriptKeyLocator is the client's key locator for the key used
// in the HTLC script spend scripts.
ClientScriptKeyLocator keychain.KeyLocator
}
// SwapContract contains the base data that is serialized to persistent storage
// for pending swaps.
type SwapContract struct {
@ -19,18 +44,8 @@ type SwapContract struct {
// AmountRequested is the total amount of the swap.
AmountRequested btcutil.Amount
// SenderKey is the key of the sender that will be used in the on-chain
// HTLC.
SenderKey [33]byte
// ReceiverKey is the of the receiver that will be used in the on-chain
// HTLC.
ReceiverKey [33]byte
// ClientKeyLocator is the key locator (family and index) for the client
// key. It is for the receiver key if this is a loop out contract, or
// the sender key if this is a loop in contract.
ClientKeyLocator keychain.KeyLocator
// HtlcKeys holds all keys used in the swap HTLC construction.
HtlcKeys HtlcKeys
// CltvExpiry is the total absolute CLTV expiry of the swap.
CltvExpiry int32