feat(dns): add CLI commands to reserve, show, delete cluster domain

cmd/uncloud/dns/show.go

@@ -0,0 +1,55 @@
+package dns
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"github.com/spf13/cobra"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+	"google.golang.org/protobuf/types/known/emptypb"
+	"uncloud/internal/cli"
+)
+
+type showOptions struct {
+	cluster string
+}
+
+func NewShowCommand() *cobra.Command {
+	opts := showOptions{}
+
+	cmd := &cobra.Command{
+		Use:   "show",
+		Short: "Print the cluster domain name.",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			uncli := cmd.Context().Value("cli").(*cli.CLI)
+			return show(cmd.Context(), uncli, opts)
+		},
+	}
+
+	cmd.Flags().StringVarP(
+		&opts.cluster, "cluster", "c", "",
+		"Name of the cluster. (default is the current cluster)",
+	)
+
+	return cmd
+}
+
+func show(ctx context.Context, uncli *cli.CLI, opts showOptions) error {
+	client, err := uncli.ConnectCluster(ctx, opts.cluster)
+	if err != nil {
+		return fmt.Errorf("connect to cluster: %w", err)
+	}
+	defer client.Close()
+
+	domain, err := client.GetDomain(ctx, &emptypb.Empty{})
+	if err != nil {
+		if status.Convert(err).Code() == codes.NotFound {
+			return errors.New("no domain reserved")
+		}
+		return err
+	}
+
+	fmt.Println(domain.Name)
+	return nil
+}