lnwallet: update dual funder verification code to use pkscript in GetUtxo

lnwallet/wallet.go

@@ -8,20 +8,20 @@ import (
 	"sync"
 	"sync/atomic"
 
+	"github.com/btcsuite/btcd/blockchain"
+	"github.com/btcsuite/btcd/chaincfg/chainhash"
+	"github.com/btcsuite/btcutil/hdkeychain"
 	"github.com/davecgh/go-spew/spew"
 	"github.com/lightningnetwork/lnd/channeldb"
 	"github.com/lightningnetwork/lnd/keychain"
 	"github.com/lightningnetwork/lnd/lnwire"
-	"github.com/btcsuite/btcd/blockchain"
-	"github.com/btcsuite/btcd/chaincfg/chainhash"
-	"github.com/btcsuite/btcutil/hdkeychain"
 
-	"github.com/lightningnetwork/lnd/shachain"
 	"github.com/btcsuite/btcd/btcec"
 	"github.com/btcsuite/btcd/txscript"
 	"github.com/btcsuite/btcd/wire"
 	"github.com/btcsuite/btcutil"
 	"github.com/btcsuite/btcutil/txsort"
+	"github.com/lightningnetwork/lnd/shachain"
 )
 
 const (
@@ -262,15 +262,15 @@ type LightningWallet struct {
 	// is removed from limbo. Each reservation is tracked by a unique
 	// monotonically integer. All requests concerning the channel MUST
 	// carry a valid, active funding ID.
-	fundingLimbo  map[uint64]*ChannelReservation
-	limboMtx      sync.RWMutex
+	fundingLimbo map[uint64]*ChannelReservation
+	limboMtx     sync.RWMutex
 
 	// lockedOutPoints is a set of the currently locked outpoint. This
 	// information is kept in order to provide an easy way to unlock all
 	// the currently locked outpoints.
 	lockedOutPoints map[wire.OutPoint]struct{}
 
-	quit     chan struct{}
+	quit chan struct{}
 
 	wg sync.WaitGroup
 
@@ -971,8 +971,18 @@ func (l *LightningWallet) handleFundingCounterPartySigs(msg *addCounterPartySigs
 
 			// Fetch the alleged previous output along with the
 			// pkscript referenced by this input.
-			// TODO(roasbeef): when dual funder pass actual height-hint
-			output, err := l.Cfg.ChainIO.GetUtxo(&txin.PreviousOutPoint, 0)
+			//
+			// TODO(roasbeef): when dual funder pass actual
+			// height-hint
+			pkScript, err := WitnessScriptHash(
+				txin.Witness[len(txin.Witness)-1],
+			)
+			if err != nil {
+			}
+			output, err := l.Cfg.ChainIO.GetUtxo(
+				&txin.PreviousOutPoint,
+				pkScript, 0,
+			)
 			if output == nil {
 				msg.err <- fmt.Errorf("input to funding tx "+
 					"does not exist: %v", err)