lnd.xprv/watchtower/lookout/punisher.go

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package lookout
import (
"github.com/btcsuite/btcd/wire"
"github.com/lightningnetwork/lnd/lnwallet"
)
// PunisherConfig houses the resources required by the Punisher.
type PunisherConfig struct {
// PublishTx provides the ability to send a signed transaction to the
// network.
PublishTx func(*wire.MsgTx) error
// TODO(conner) add DB tracking and spend ntfn registration to see if
// ours confirmed or not
}
// BreachPunisher handles the responsibility of constructing and broadcasting
// justice transactions. Justice transactions are constructed from previously
// accepted state updates uploaded by the watchtower's clients.
type BreachPunisher struct {
cfg *PunisherConfig
}
// NewBreachPunisher constructs a new BreachPunisher given a PunisherConfig.
func NewBreachPunisher(cfg *PunisherConfig) *BreachPunisher {
return &BreachPunisher{
cfg: cfg,
}
}
// Punish constructs a justice transaction given a JusticeDescriptor and
// publishes is it to the network.
func (p *BreachPunisher) Punish(desc *JusticeDescriptor, quit <-chan struct{}) error {
justiceTxn, err := desc.CreateJusticeTxn()
if err != nil {
log.Errorf("Unable to create justice txn for "+
"client=%s with breach-txid=%x: %v",
desc.SessionInfo.ID, desc.BreachedCommitTx.TxHash(), err)
return err
}
log.Infof("Publishing justice transaction txid=%x for client=%s",
justiceTxn.TxHash(), desc.SessionInfo.ID)
err = p.cfg.PublishTx(justiceTxn)
if err != nil && err != lnwallet.ErrDoubleSpend {
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log.Errorf("Unable to publish justice txn for client=%s"+
"with breach-txid=%x: %v",
desc.SessionInfo.ID, desc.BreachedCommitTx.TxHash(), err)
return err
}
// TODO(conner): register for spend and remove from db after
// confirmation
return nil
}