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package loop
import (
type swapKit struct {
htlc *swap.Htlc
hash lntypes.Hash
height int32
log *swap.PrefixLog
lastUpdateTime time.Time
cost loopdb.SwapCost
state loopdb.SwapState
contract *loopdb.SwapContract
swapType swap.Type
func newSwapKit(hash lntypes.Hash, swapType swap.Type, cfg *swapConfig,
contract *loopdb.SwapContract, outputType swap.HtlcOutputType) (
*swapKit, error) {
// Compose expected on-chain swap script
htlc, err := swap.NewHtlc(
contract.CltvExpiry, contract.SenderKey,
contract.ReceiverKey, hash, outputType,
if err != nil {
return nil, err
log := &swap.PrefixLog{
Hash: hash,
Logger: log,
// Log htlc address for debugging.
log.Infof("Htlc address: %v", htlc.Address)
return &swapKit{
swapConfig: *cfg,
hash: hash,
log: log,
htlc: htlc,
state: loopdb.StateInitiated,
contract: contract,
swapType: swapType,
}, nil
// sendUpdate reports an update to the swap state.
func (s *swapKit) sendUpdate(ctx context.Context) error {
info := &SwapInfo{
SwapContract: *s.contract,
SwapHash: s.hash,
SwapType: s.swapType,
LastUpdate: s.lastUpdateTime,
SwapStateData: loopdb.SwapStateData{
State: s.state,
Cost: s.cost,
HtlcAddress: s.htlc.Address,
s.log.Infof("state %v", info.State)
select {
case s.statusChan <- *info:
case <-ctx.Done():
return ctx.Err()
return nil
type genericSwap interface {
execute(mainCtx context.Context, cfg *executeConfig,
height int32) error
type swapConfig struct {
lnd *lndclient.LndServices
store loopdb.SwapStore
server swapServerClient