cmd/lncli/watchtower: add tower info command

cmd/lncli/main.go

@@ -300,11 +300,12 @@ func main() {
 		restoreChanBackupCommand,
 	}
 
-	// Add any extra autopilot commands determined by build flags.
+	// Add any extra commands determined by build flags.
 	app.Commands = append(app.Commands, autopilotCommands()...)
 	app.Commands = append(app.Commands, invoicesCommands()...)
 	app.Commands = append(app.Commands, routerCommands()...)
 	app.Commands = append(app.Commands, walletCommands()...)
+	app.Commands = append(app.Commands, watchtowerCommands()...)
 
 	if err := app.Run(os.Args); err != nil {
 		fatal(err)

cmd/lncli/watchtower_active.go

@@ -0,0 +1,65 @@
+// +build watchtowerrpc
+
+package main
+
+import (
+	"context"
+	"encoding/hex"
+
+	"github.com/lightningnetwork/lnd/lnrpc/watchtowerrpc"
+	"github.com/urfave/cli"
+)
+
+func watchtowerCommands() []cli.Command {
+	return []cli.Command{
+		{
+			Name:     "tower",
+			Usage:    "Interact with the watchtower.",
+			Category: "Watchtower",
+			Subcommands: []cli.Command{
+				towerInfoCommand,
+			},
+		},
+	}
+}
+
+func getWatchtowerClient(ctx *cli.Context) (watchtowerrpc.WatchtowerClient, func()) {
+	conn := getClientConn(ctx, false)
+	cleanup := func() {
+		conn.Close()
+	}
+	return watchtowerrpc.NewWatchtowerClient(conn), cleanup
+}
+
+var towerInfoCommand = cli.Command{
+	Name:   "info",
+	Usage:  "Returns basic information related to the active watchtower.",
+	Action: actionDecorator(towerInfo),
+}
+
+func towerInfo(ctx *cli.Context) error {
+	if ctx.NArg() != 0 || ctx.NumFlags() > 0 {
+		return cli.ShowCommandHelp(ctx, "info")
+	}
+
+	client, cleanup := getWatchtowerClient(ctx)
+	defer cleanup()
+
+	req := &watchtowerrpc.GetInfoRequest{}
+	resp, err := client.GetInfo(context.Background(), req)
+	if err != nil {
+		return err
+	}
+
+	printJSON(struct {
+		Pubkey    string   `json:"pubkey"`
+		Listeners []string `json:"listeners"`
+		URIs      []string `json:"uris"`
+	}{
+		Pubkey:    hex.EncodeToString(resp.Pubkey),
+		Listeners: resp.Listeners,
+		URIs:      resp.Uris,
+	})
+
+	return nil
+}

cmd/lncli/watchtower_default.go

@@ -0,0 +1,10 @@
+// +build !watchtowerrpc
+
+package main
+
+import "github.com/urfave/cli"
+
+// watchtowerCommands will return nil for non-watchtowerrpc builds.
+func watchtowerCommands() []cli.Command {
+	return nil
+}