multi: add DecorateInputs to WalletController interface

This commit adds the new DecorateInputs method of the base wallet to the
WalletController interface.

lntest/mock/walletcontroller.go

@@ -227,6 +227,11 @@ func (w *WalletController) FinalizePsbt(_ *psbt.Packet, _ string) error {
 	return nil
 }
 
+// DecorateInputs currently does nothing.
+func (w *WalletController) DecorateInputs(*psbt.Packet, bool) error {
+	return nil
+}
+
 // PublishTransaction sends a transaction to the PublishedTransactions chan.
 func (w *WalletController) PublishTransaction(tx *wire.MsgTx, _ string) error {
 	w.PublishedTransactions <- tx

lnwallet/btcwallet/psbt.go

@@ -596,6 +596,18 @@ func (b *BtcWallet) FinalizePsbt(packet *psbt.Packet, accountName string) error
 	return b.wallet.FinalizePsbt(keyScope, accountNum, packet)
 }
 
+// DecorateInputs fetches the UTXO information of all inputs it can identify and
+// adds the required information to the package's inputs. The failOnUnknown
+// boolean controls whether the method should return an error if it cannot
+// identify an input or if it should just skip it.
+//
+// This is a part of the WalletController interface.
+func (b *BtcWallet) DecorateInputs(packet *psbt.Packet,
+	failOnUnknown bool) error {
+
+	return b.wallet.DecorateInputs(packet, failOnUnknown)
+}
+
 // lookupFirstCustomAccount returns the first custom account found. In theory,
 // there should be only one custom account for the given name. However, due to a
 // lack of check, users could have created custom accounts with various key

lnwallet/interface.go

@@ -501,6 +501,12 @@ type WalletController interface {
 	// finalized successfully.
 	FinalizePsbt(packet *psbt.Packet, account string) error
 
+	// DecorateInputs fetches the UTXO information of all inputs it can
+	// identify and adds the required information to the package's inputs.
+	// The failOnUnknown boolean controls whether the method should return
+	// an error if it cannot identify an input or if it should just skip it.
+	DecorateInputs(packet *psbt.Packet, failOnUnknown bool) error
+
 	// SubscribeTransactions returns a TransactionSubscription client which
 	// is capable of receiving async notifications as new transactions
 	// related to the wallet are seen within the network, or found in

lnwallet/mock.go

@@ -235,6 +235,11 @@ func (w *mockWalletController) FinalizePsbt(_ *psbt.Packet, _ string) error {
 	return nil
 }
 
+// DecorateInputs currently does nothing.
+func (w *mockWalletController) DecorateInputs(*psbt.Packet, bool) error {
+	return nil
+}
+
 // PublishTransaction sends a transaction to the PublishedTransactions chan.
 func (w *mockWalletController) PublishTransaction(tx *wire.MsgTx,
 	_ string) error {