lnd.xprv/lnrpc/walletrpc/psbt.go

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// +build walletrpc
package walletrpc
import (
"fmt"
"math"
"time"
"github.com/btcsuite/btcd/wire"
"github.com/btcsuite/btcutil/psbt"
"github.com/btcsuite/btcwallet/wtxmgr"
"github.com/lightningnetwork/lnd/lnwallet"
)
const (
defaultMinConf = 1
defaultMaxConf = math.MaxInt32
)
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var (
// DefaultLockDuration is the default duration used to lock outputs.
DefaultLockDuration = 10 * time.Minute
)
// utxoLock is a type that contains an outpoint of an UTXO and its lock lease
// information.
type utxoLock struct {
lockID wtxmgr.LockID
outpoint wire.OutPoint
expiration time.Time
}
// verifyInputsUnspent checks that all inputs are contained in the list of
// known, non-locked UTXOs given.
func verifyInputsUnspent(inputs []*wire.TxIn, utxos []*lnwallet.Utxo) error {
// TODO(guggero): Pass in UTXOs as a map to make lookup more efficient.
for idx, txIn := range inputs {
found := false
for _, u := range utxos {
if u.OutPoint == txIn.PreviousOutPoint {
found = true
break
}
}
if !found {
return fmt.Errorf("input %d not found in list of non-"+
"locked UTXO", idx)
}
}
return nil
}
// lockInputs requests a lock lease for all inputs specified in a PSBT packet
// by using the internal, static lock ID of lnd's wallet.
func lockInputs(w lnwallet.WalletController, packet *psbt.Packet) ([]*utxoLock,
error) {
locks := make([]*utxoLock, len(packet.UnsignedTx.TxIn))
for idx, rawInput := range packet.UnsignedTx.TxIn {
lock := &utxoLock{
lockID: LndInternalLockID,
outpoint: rawInput.PreviousOutPoint,
}
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expiration, err := w.LeaseOutput(
lock.lockID, lock.outpoint, DefaultLockDuration,
)
if err != nil {
// If we run into a problem with locking one output, we
// should try to unlock those that we successfully
// locked so far. If that fails as well, there's not
// much we can do.
for i := 0; i < idx; i++ {
op := locks[i].outpoint
if err := w.ReleaseOutput(
LndInternalLockID, op,
); err != nil {
log.Errorf("could not release the "+
"lock on %v: %v", op, err)
}
}
return nil, fmt.Errorf("could not lease a lock on "+
"UTXO: %v", err)
}
lock.expiration = expiration
locks[idx] = lock
}
return locks, nil
}