package main import ( "errors" "fmt" "strings" "github.com/lightningnetwork/lnd/chainreg" "github.com/lightningnetwork/lnd/lnrpc/routerrpc" "github.com/lightningnetwork/lnd/routing/route" "github.com/urfave/cli" ) var buildRouteCommand = cli.Command{ Name: "buildroute", Category: "Payments", Usage: "Build a route from a list of hop pubkeys.", Action: actionDecorator(buildRoute), Flags: []cli.Flag{ cli.Int64Flag{ Name: "amt", Usage: "the amount to send expressed in satoshis. If" + "not set, the minimum routable amount is used", }, cli.Int64Flag{ Name: "final_cltv_delta", Usage: "number of blocks the last hop has to reveal " + "the preimage", Value: chainreg.DefaultBitcoinTimeLockDelta, }, cli.StringFlag{ Name: "hops", Usage: "comma separated hex pubkeys", }, cli.Uint64Flag{ Name: "outgoing_chan_id", Usage: "short channel id of the outgoing channel to " + "use for the first hop of the payment", Value: 0, }, }, } func buildRoute(ctx *cli.Context) error { ctxc := getContext() conn := getClientConn(ctx, false) defer conn.Close() client := routerrpc.NewRouterClient(conn) if !ctx.IsSet("hops") { return errors.New("hops required") } // Build list of hop addresses for the rpc. hops := strings.Split(ctx.String("hops"), ",") rpcHops := make([][]byte, 0, len(hops)) for _, k := range hops { pubkey, err := route.NewVertexFromStr(k) if err != nil { return fmt.Errorf("error parsing %v: %v", k, err) } rpcHops = append(rpcHops, pubkey[:]) } var amtMsat int64 hasAmt := ctx.IsSet("amt") if hasAmt { amtMsat = ctx.Int64("amt") * 1000 if amtMsat == 0 { return fmt.Errorf("non-zero amount required") } } // Call BuildRoute rpc. req := &routerrpc.BuildRouteRequest{ AmtMsat: amtMsat, FinalCltvDelta: int32(ctx.Int64("final_cltv_delta")), HopPubkeys: rpcHops, OutgoingChanId: ctx.Uint64("outgoing_chan_id"), } route, err := client.BuildRoute(ctxc, req) if err != nil { return err } printRespJSON(route) return nil }