loop: static address withdrawals support

Author: hieblmi

cmd/loop/staticaddr.go

@@ -2,8 +2,13 @@ package main
 
 import (
 	"context"
+	"encoding/hex"
+	"errors"
 	"fmt"
+	"strconv"
+	"strings"
 
+	"github.com/btcsuite/btcd/chaincfg/chainhash"
 	"github.com/lightninglabs/loop/looprpc"
 	"github.com/urfave/cli"
 )
@@ -16,6 +21,7 @@ var staticAddressCommands = cli.Command{
 	Subcommands: []cli.Command{
 		newStaticAddressCommand,
 		listUnspentCommand,
+		withdrawalCommand,
 	},
 }
 
@@ -105,3 +111,111 @@ func listUnspent(ctx *cli.Context) error {
 
 	return nil
 }
+
+var withdrawalCommand = cli.Command{
+	Name:      "withdraw",
+	ShortName: "w",
+	Usage:     "Withdraw from static address deposits.",
+	Description: `
+	Withdraws from all or selected static address deposits by sweeping them 
+	back to our lnd wallet.
+	`,
+	Flags: []cli.Flag{
+		cli.StringSliceFlag{
+			Name: "utxo",
+			Usage: "specify utxos as outpoints(tx:idx) which will" +
+				"be withdrawn.",
+		},
+		cli.BoolFlag{
+			Name:  "all",
+			Usage: "withdraws all static address deposits.",
+		},
+	},
+	Action: withdraw,
+}
+
+func withdraw(ctx *cli.Context) error {
+	if ctx.NArg() > 0 {
+		return cli.ShowCommandHelp(ctx, "withdraw")
+	}
+
+	client, cleanup, err := getClient(ctx)
+	if err != nil {
+		return err
+	}
+	defer cleanup()
+
+	var (
+		isAllSelected  = ctx.IsSet("all")
+		isUtxoSelected = ctx.IsSet("utxo")
+		outpoints      []*looprpc.OutPoint
+		ctxb           = context.Background()
+	)
+
+	switch {
+	case isAllSelected == isUtxoSelected:
+		return errors.New("must select either all or some utxos")
+
+	case isAllSelected:
+	case isUtxoSelected:
+		utxos := ctx.StringSlice("utxo")
+		outpoints, err = utxosToOutpoints(utxos)
+		if err != nil {
+			return err
+		}
+
+	default:
+		return fmt.Errorf("unknown withdrawal request")
+	}
+
+	resp, err := client.WithdrawDeposits(ctxb, &looprpc.WithdrawDepositsRequest{
+		Outpoints: outpoints,
+		All:       isAllSelected,
+	})
+	if err != nil {
+		return err
+	}
+
+	printRespJSON(resp)
+
+	return nil
+}
+
+func utxosToOutpoints(utxos []string) ([]*looprpc.OutPoint, error) {
+	outpoints := make([]*looprpc.OutPoint, 0, len(utxos))
+	if len(utxos) == 0 {
+		return nil, fmt.Errorf("no utxos specified")
+	}
+	for _, utxo := range utxos {
+		outpoint, err := NewProtoOutPoint(utxo)
+		if err != nil {
+			return nil, err
+		}
+		outpoints = append(outpoints, outpoint)
+	}
+
+	return outpoints, nil
+}
+
+// NewProtoOutPoint parses an OutPoint into its corresponding lnrpc.OutPoint
+// type.
+func NewProtoOutPoint(op string) (*looprpc.OutPoint, error) {
+	parts := strings.Split(op, ":")
+	if len(parts) != 2 {
+		return nil, errors.New("outpoint should be of the form " +
+			"txid:index")
+	}
+	txid := parts[0]
+	if hex.DecodedLen(len(txid)) != chainhash.HashSize {
+		return nil, fmt.Errorf("invalid hex-encoded txid %v", txid)
+	}
+	outputIndex, err := strconv.Atoi(parts[1])
+	if err != nil {
+		return nil, fmt.Errorf("invalid output index: %v", err)
+	}
+
+	return &looprpc.OutPoint{
+		TxidStr:     txid,
+		OutputIndex: uint32(outputIndex),
+	}, nil
+}