chanfunding: use {Lease|Release}Output not {Lock|Unlock}Outpoint

lnwallet/chanfunding/assembler.go

@@ -1,9 +1,12 @@
 package chanfunding
 
 import (
+	"time"
+
 	"github.com/btcsuite/btcd/btcutil"
 	"github.com/btcsuite/btcd/wire"
 	"github.com/btcsuite/btcwallet/wallet"
+	"github.com/btcsuite/btcwallet/wtxmgr"
 	"github.com/lightningnetwork/lnd/lnwallet/chainfee"
 )
 
@@ -34,18 +37,18 @@ type CoinSelectionLocker interface {
 	WithCoinSelectLock(func() error) error
 }
 
-// OutpointLocker allows a caller to lock/unlock an outpoint. When locked, the
-// outpoints shouldn't be used for any sort of channel funding of coin
-// selection. Locked outpoints are not expected to be persisted between
-// restarts.
-type OutpointLocker interface {
-	// LockOutpoint locks a target outpoint, rendering it unusable for coin
+// OutputLeaser allows a caller to lease/release an output. When leased, the
+// outputs shouldn't be used for any sort of channel funding or coin selection.
+// Leased outputs are expected to be persisted between restarts.
+type OutputLeaser interface {
+	// LeaseOutput leases a target output, rendering it unusable for coin
 	// selection.
-	LockOutpoint(o wire.OutPoint)
+	LeaseOutput(i wtxmgr.LockID, o wire.OutPoint, d time.Duration) (
+		time.Time, []byte, btcutil.Amount, error)
 
-	// UnlockOutpoint unlocks a target outpoint, allowing it to be used for
+	// ReleaseOutput releases a target output, allowing it to be used for
 	// coin selection once again.
-	UnlockOutpoint(o wire.OutPoint)
+	ReleaseOutput(i wtxmgr.LockID, o wire.OutPoint) error
 }
 
 // Request is a new request for funding a channel. The items in the struct

lnwallet/chanfunding/wallet_assembler.go

@@ -62,9 +62,9 @@ type FullIntent struct {
 	// change from the main funding transaction.
 	ChangeOutputs []*wire.TxOut
 
-	// coinLocker is the Assembler's instance of the OutpointLocker
+	// coinLeaser is the Assembler's instance of the OutputLeaser
 	// interface.
-	coinLocker OutpointLocker
+	coinLeaser OutputLeaser
 
 	// coinSource is the Assembler's instance of the CoinSource interface.
 	coinSource CoinSource
@@ -219,7 +219,13 @@ func (f *FullIntent) Outputs() []*wire.TxOut {
 // NOTE: Part of the chanfunding.Intent interface.
 func (f *FullIntent) Cancel() {
 	for _, coin := range f.InputCoins {
-		f.coinLocker.UnlockOutpoint(coin.OutPoint)
+		err := f.coinLeaser.ReleaseOutput(
+			LndInternalLockID, coin.OutPoint,
+		)
+		if err != nil {
+			log.Warnf("Failed to release UTXO %s (%v))",
+				coin.OutPoint, err)
+		}
 	}
 
 	f.ShimIntent.Cancel()
@@ -241,9 +247,9 @@ type WalletConfig struct {
 	// access to the current set of coins returned by the CoinSource.
 	CoinSelectLocker CoinSelectionLocker
 
-	// CoinLocker is what the WalletAssembler uses to lock coins that may
+	// CoinLeaser is what the WalletAssembler uses to lease coins that may
 	// be used as inputs for a new funding transaction.
-	CoinLocker OutpointLocker
+	CoinLeaser OutputLeaser
 
 	// Signer allows the WalletAssembler to sign inputs on any potential
 	// funding transactions.
@@ -518,7 +524,13 @@ func (w *WalletAssembler) ProvisionChannel(r *Request) (Intent, error) {
 		for _, coin := range selectedCoins {
 			outpoint := coin.OutPoint
 
-			w.cfg.CoinLocker.LockOutpoint(outpoint)
+			_, _, _, err = w.cfg.CoinLeaser.LeaseOutput(
+				LndInternalLockID, outpoint,
+				DefaultReservationTimeout,
+			)
+			if err != nil {
+				return err
+			}
 		}
 
 		newIntent := &FullIntent{
@@ -528,7 +540,7 @@ func (w *WalletAssembler) ProvisionChannel(r *Request) (Intent, error) {
 				musig2:           r.Musig2,
 			},
 			InputCoins: selectedCoins,
-			coinLocker: w.cfg.CoinLocker,
+			coinLeaser: w.cfg.CoinLeaser,
 			coinSource: w.cfg.CoinSource,
 			signer:     w.cfg.Signer,
 		}

lnwallet/test/test_interface.go

@@ -2990,7 +2990,7 @@ func testSingleFunderExternalFundingTx(miner *rpctest.Harness,
 		chanfunding.WalletConfig{
 			CoinSource:            lnwallet.NewCoinSource(alice),
 			CoinSelectLocker:      alice,
-			CoinLocker:            alice,
+			CoinLeaser:            alice,
 			Signer:                alice.Cfg.Signer,
 			DustLimit:             600,
 			CoinSelectionStrategy: wallet.CoinSelectionLargest,

lnwallet/wallet.go

@@ -851,7 +851,7 @@ func (l *LightningWallet) handleFundingReserveRequest(req *InitFundingReserveMsg
 		cfg := chanfunding.WalletConfig{
 			CoinSource:       &CoinSource{l},
 			CoinSelectLocker: l,
-			CoinLocker:       l,
+			CoinLeaser:       l,
 			Signer:           l.Cfg.Signer,
 			DustLimit: DustLimitForSize(
 				input.P2WSHSize,