loop: add instantout cmd

Author: sputn1ck

cmd/loop/instantout.go

@@ -0,0 +1,166 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/lightninglabs/loop/instantout/reservation"
+	"github.com/lightninglabs/loop/looprpc"
+	"github.com/urfave/cli"
+)
+
+var instantOutCommand = cli.Command{
+	Name:  "instantout",
+	Usage: "perform an instant off-chain to on-chain swap (looping out)",
+	Description: `
+	Attempts to instantly loop out into the backing lnd's wallet. The amount
+	will be chosen via the cli.
+	`,
+	Flags: []cli.Flag{
+		cli.StringFlag{
+			Name: "channel",
+			Usage: "the comma-separated list of short " +
+				"channel IDs of the channels to loop out",
+		},
+	},
+	Action: instantOut,
+}
+
+func instantOut(ctx *cli.Context) error {
+	// Parse outgoing channel set. Don't string split if the flag is empty.
+	// Otherwise, strings.Split returns a slice of length one with an empty
+	// element.
+	var outgoingChanSet []uint64
+	if ctx.IsSet("channel") {
+		chanStrings := strings.Split(ctx.String("channel"), ",")
+		for _, chanString := range chanStrings {
+			chanID, err := strconv.ParseUint(chanString, 10, 64)
+			if err != nil {
+				return fmt.Errorf("error parsing channel id "+
+					"\"%v\"", chanString)
+			}
+			outgoingChanSet = append(outgoingChanSet, chanID)
+		}
+	}
+
+	// First set up the swap client itself.
+	client, cleanup, err := getClient(ctx)
+	if err != nil {
+		return err
+	}
+	defer cleanup()
+
+	// Now we fetch all the confirmed reservations.
+	reservations, err := client.ListReservations(
+		context.Background(), &looprpc.ListReservationsRequest{},
+	)
+	if err != nil {
+		return err
+	}
+
+	var (
+		confirmedReservations []*looprpc.ClientReservation
+		totalAmt              int64
+		idx                   int
+	)
+
+	for _, res := range reservations.Reservations {
+		if res.State != string(reservation.Confirmed) {
+			continue
+		}
+
+		confirmedReservations = append(confirmedReservations, res)
+	}
+
+	if len(confirmedReservations) == 0 {
+		fmt.Printf("No confirmed reservations found \n")
+		return nil
+	}
+
+	fmt.Printf("Available reservations: \n\n")
+	for _, res := range confirmedReservations {
+		idx++
+		fmt.Printf("Reservation %v: %v \n", idx, res.Amount)
+		totalAmt += int64(res.Amount)
+	}
+
+	fmt.Println()
+	fmt.Printf("Max amount to instant out: %v\n", totalAmt)
+	fmt.Println()
+
+	fmt.Println("Select reservations for instantout (e.g. '1,2,3')")
+	fmt.Println("Type 'ALL' to use all available reservations.")
+
+	var answer string
+	fmt.Scanln(&answer)
+
+	// Parse
+	var selectedReservations [][]byte
+	switch answer {
+	case "ALL":
+		for _, res := range confirmedReservations {
+			selectedReservations = append(
+				selectedReservations,
+				res.ReservationId,
+			)
+		}
+
+	case "":
+		return fmt.Errorf("no reservations selected")
+
+	default:
+		selectedIndexes := strings.Split(answer, ",")
+		selectedIndexMap := make(map[int]struct{})
+		for _, idxStr := range selectedIndexes {
+			idx, err := strconv.Atoi(idxStr)
+			if err != nil {
+				return err
+			}
+			if idx < 0 {
+				return fmt.Errorf("invalid index %v", idx)
+			}
+
+			if idx > len(confirmedReservations) {
+				return fmt.Errorf("invalid index %v", idx)
+			}
+			if _, ok := selectedIndexMap[idx]; ok {
+				return fmt.Errorf("duplicate index %v", idx)
+			}
+
+			selectedReservations = append(
+				selectedReservations,
+				confirmedReservations[idx-1].ReservationId,
+			)
+
+			selectedIndexMap[idx] = struct{}{}
+		}
+
+	}
+
+	fmt.Println("Starting instant swap out")
+
+	// Now we can request the instant out swap.
+	instantOutRes, err := client.InstantOut(
+		context.Background(),
+		&looprpc.InstantOutRequest{
+			ReservationIds:  selectedReservations,
+			OutgoingChanSet: outgoingChanSet,
+		},
+	)
+
+	if err != nil {
+		return err
+	}
+
+	fmt.Printf("Instant out swap initiated with ID: %x, State: %v \n",
+		instantOutRes.InstantOutHash, instantOutRes.State)
+
+	if instantOutRes.SweepTxId != "" {
+		fmt.Printf("Sweepless sweep tx id: %v \n",
+			instantOutRes.SweepTxId)
+	}
+
+	return nil
+}

cmd/loop/main.go

@@ -148,6 +148,7 @@ func main() {
 		listSwapsCommand, swapInfoCommand, getLiquidityParamsCommand,
 		setLiquidityRuleCommand, suggestSwapCommand, setParamsCommand,
 		getInfoCommand, abandonSwapCommand, reservationsCommands,
+		instantOutCommand,
 	}
 
 	err := app.Run(os.Args)