lncli: add new removetx cmd.

This new command calls the new rpc endpoint RemoveTransaction.

cmd/lncli/walletrpc_active.go

@@ -75,6 +75,7 @@ func walletCommands() []cli.Command {
 				labelTxCommand,
 				publishTxCommand,
 				getTxCommand,
+				removeTxCommand,
 				releaseOutputCommand,
 				leaseOutputCommand,
 				listLeasesCommand,
@@ -545,7 +546,6 @@ func publishTransaction(ctx *cli.Context) error {
 
 	req := &walletrpc.Transaction{
 		TxHex: tx,
-		Label: ctx.String("label"),
 	}
 
 	_, err = walletClient.PublishTransaction(ctxc, req)
@@ -599,6 +599,66 @@ func getTransaction(ctx *cli.Context) error {
 	return nil
 }
 
+var removeTxCommand = cli.Command{
+	Name: "removetx",
+	Usage: "Attempts to remove the unconfirmed transaction with the " +
+		"specified txid and all its children from the underlying " +
+		"internal wallet.",
+	ArgsUsage: "txid",
+	Description: `
+	Removes the transaction with the specified txid from the underlying 
+	wallet which must still be unconfirmmed (in mempool). This command is 
+	useful when a transaction is RBFed by another transaction. The wallet 
+	will only resolve this conflict when the other transaction is mined 
+	(which can take time). If a transaction was removed erronously a simple
+	rebroadcast of the former transaction with the "publishtx" cmd will
+	register the relevant outputs of the raw tx again with the wallet
+	(if there are no errors broadcasting this transaction due to an RBF
+	replacement sitting in the mempool). As soon as a removed transaction
+	is confirmed funds will be registered with the wallet again.`,
+	Flags:  []cli.Flag{},
+	Action: actionDecorator(removeTransaction),
+}
+
+func removeTransaction(ctx *cli.Context) error {
+	ctxc := getContext()
+
+	// Display the command's help message if we do not have the expected
+	// number of arguments/flags.
+	if ctx.NArg() != 1 {
+		return cli.ShowCommandHelp(ctx, "removetx")
+	}
+
+	// Fetch the only cmd argument which must be a valid txid.
+	txid := ctx.Args().First()
+	txHash, err := chainhash.NewHashFromStr(txid)
+	if err != nil {
+		return err
+	}
+
+	walletClient, cleanUp := getWalletClient(ctx)
+	defer cleanUp()
+
+	req := &walletrpc.GetTransactionRequest{
+		Txid: txHash.String(),
+	}
+
+	resp, err := walletClient.RemoveTransaction(ctxc, req)
+	if err != nil {
+		return err
+	}
+
+	printJSON(&struct {
+		Status string `json:"status"`
+		TxID   string `json:"txid"`
+	}{
+		Status: resp.GetStatus(),
+		TxID:   txHash.String(),
+	})
+
+	return nil
+}
+
 // utxoLease contains JSON annotations for a lease on an unspent output.
 type utxoLease struct {
 	ID         string   `json:"id"`