lnwallet: add label transaction to WalletController interface

lnwallet/btcwallet/btcwallet.go

@@ -461,6 +461,17 @@ func (b *BtcWallet) PublishTransaction(tx *wire.MsgTx, label string) error {
 	return nil
 }
 
+// LabelTransaction adds a label to a transaction. If the tx already
+// has a label, this call will fail unless the overwrite parameter
+// is set. Labels must not be empty, and they are limited to 500 chars.
+//
+// Note: it is part of the WalletController interface.
+func (b *BtcWallet) LabelTransaction(hash chainhash.Hash, label string,
+	overwrite bool) error {
+
+	return b.wallet.LabelTransaction(hash, label, overwrite)
+}
+
 // extractBalanceDelta extracts the net balance delta from the PoV of the
 // wallet given a TransactionSummary.
 func extractBalanceDelta(

lnwallet/interface.go

@@ -231,6 +231,11 @@ type WalletController interface {
 	// published transaction.
 	PublishTransaction(tx *wire.MsgTx, label string) error
 
+	// LabelTransaction adds a label to a transaction. If the tx already
+	// has a label, this call will fail unless the overwrite parameter
+	// is set. Labels must not be empty, and they are limited to 500 chars.
+	LabelTransaction(hash chainhash.Hash, label string, overwrite 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

mock.go

@@ -326,6 +326,13 @@ func (m *mockWalletController) PublishTransaction(tx *wire.MsgTx, _ string) erro
 	m.publishedTransactions <- tx
 	return nil
 }
+
+func (m *mockWalletController) LabelTransaction(_ chainhash.Hash, _ string,
+	_ bool) error {
+
+	return nil
+}
+
 func (*mockWalletController) SubscribeTransactions() (lnwallet.TransactionSubscription, error) {
 	return nil, nil
 }