lnd.xprv/cmd/lncli/cmd_build_route.go

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package main
import (
"errors"
"fmt"
"strings"
"github.com/lightningnetwork/lnd/chainreg"
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"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,
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},
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()
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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)
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if err != nil {
return err
}
printRespJSON(route)
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return nil
}