Add [antctl mc] command

Signed-off-by: hjiajing <hjiajing@vmware.com>

pkg/antctl/antctl.go

@@ -24,6 +24,7 @@ import (
 	"antrea.io/antrea/pkg/agent/openflow"
 	fallbackversion "antrea.io/antrea/pkg/antctl/fallback/version"
 	"antrea.io/antrea/pkg/antctl/raw/featuregates"
+	"antrea.io/antrea/pkg/antctl/raw/multicluster"
 	"antrea.io/antrea/pkg/antctl/raw/proxy"
 	"antrea.io/antrea/pkg/antctl/raw/supportbundle"
 	"antrea.io/antrea/pkg/antctl/raw/traceflow"
@@ -531,6 +532,12 @@ var CommandList = &commandList{
 			supportController: true,
 			commandGroup:      get,
 		},
+		{
+			cobraCommand:      multicluster.GetCmd,
+			supportAgent:      false,
+			supportController: false,
+			commandGroup:      mc,
+		},
 	},
 	codec: scheme.Codecs,
 }

pkg/antctl/command_definition.go

@@ -76,6 +76,7 @@ const (
 	flat commandGroup = iota
 	get
 	query
+	mc
 )
 
 var groupCommands = map[commandGroup]*cobra.Command{
@@ -89,6 +90,11 @@ var groupCommands = map[commandGroup]*cobra.Command{
 		Short: "Execute a user-provided query",
 		Long:  "Execute a user-provided query",
 	},
+	mc: {
+		Use:   "mc",
+		Short: "Sub-commands of multi-cluster feature",
+		Long:  "Sub-commands of multi-cluster feature",
+	},
 }
 
 type endpointResponder interface {

pkg/antctl/command_list.go

@@ -63,7 +63,8 @@ func (cl *commandList) applyToRootCommand(root *cobra.Command, client AntctlClie
 
 	for _, cmd := range cl.rawCommands {
 		if (runtime.Mode == runtime.ModeAgent && cmd.supportAgent) ||
-			(runtime.Mode == runtime.ModeController && cmd.supportController) {
+			(runtime.Mode == runtime.ModeController && cmd.supportController) ||
+			(!runtime.InPod && cmd.commandGroup == mc) {
 			if groupCommand, ok := groupCommands[cmd.commandGroup]; ok {
 				groupCommand.AddCommand(cmd.cobraCommand)
 			} else {

pkg/antctl/raw/multicluster/command.go

@@ -0,0 +1,56 @@
+// Copyright 2022 Antrea Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package multicluster
+
+import (
+	"bytes"
+	"encoding/json"
+
+	"github.com/spf13/cobra"
+	"sigs.k8s.io/yaml"
+)
+
+const (
+	singleType   = "single"
+	multipleType = "multiple"
+)
+
+var GetCmd = &cobra.Command{
+	Use:   "get",
+	Short: "Display one or many resources in a ClusterSet",
+}
+
+func jsonOutput(obj interface{}) (bytes.Buffer, error) {
+	byteJson, err := json.Marshal(obj)
+	if err != nil {
+		return bytes.Buffer{}, err
+	}
+	var prettyJson bytes.Buffer
+	err = json.Indent(&prettyJson, byteJson, "", " ")
+	if err != nil {
+		return bytes.Buffer{}, err
+	}
+
+	return prettyJson, nil
+}
+
+func yamlOutput(obj interface{}) ([]byte, error) {
+	yamlByte, err := yaml.Marshal(obj)
+	if err != nil {
+		return nil, err
+	}
+
+	return yamlByte, nil
+}

pkg/antctl/raw/multicluster/resourceimport.go

@@ -0,0 +1,208 @@
+// Copyright 2022 Antrea Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package multicluster
+
+import (
+	"context"
+	"fmt"
+	"sort"
+	"strings"
+
+	"github.com/spf13/cobra"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	k8sruntime "k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/types"
+	k8sscheme "k8s.io/client-go/kubernetes/scheme"
+	"k8s.io/client-go/rest"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	mcsscheme "sigs.k8s.io/mcs-api/pkg/client/clientset/versioned/scheme"
+
+	multiclusterv1alpha1 "antrea.io/antrea/multicluster/apis/multicluster/v1alpha1"
+	antreamcscheme "antrea.io/antrea/multicluster/pkg/client/clientset/versioned/scheme"
+	"antrea.io/antrea/pkg/antctl/raw"
+)
+
+var command *cobra.Command
+
+type resourceImportOptions struct {
+	namespace     string
+	outputFormat  string
+	allNamespaces bool
+}
+
+var options *resourceImportOptions
+
+var resourceImportExample = strings.Trim(`
+Gel all resource imports of a cluster set in default Namespace
+$ antctl mc get resourceimport
+Get all resource imports of a cluster set in all Namespaces
+$ antctl mc get resourceimport -A
+Get all resource imports of specified namespace
+$ antctl mc get resourceimport -n <NAMESPACE>
+Get all resource imports and print json format
+$ antctl mc get resourceimport -o json
+Get a specified resourceimport
+$ antctl mc get resourceimport <RESOURCEIMPORT> -n <NAMESPACE>
+`, "\n")
+
+func (o *resourceImportOptions) validateAndComplete() {
+	if o.allNamespaces {
+		o.namespace = metav1.NamespaceAll
+		return
+	}
+	if o.namespace == "" {
+		o.namespace = metav1.NamespaceDefault
+		return
+	}
+}
+
+func init() {
+	command = &cobra.Command{
+		Use: "resourceimport",
+		Aliases: []string{
+			"resourceimports",
+			"ri",
+		},
+		Short:   "Print Multi-Cluster ResourceImports",
+		Args:    cobra.MaximumNArgs(1),
+		Example: resourceImportExample,
+		RunE:    runE,
+	}
+	o := &resourceImportOptions{}
+	options = o
+	command.Flags().StringVarP(&o.namespace, "namespace", "n", "", "Namespace of ResourceImports")
+	command.Flags().StringVarP(&o.outputFormat, "output", "o", "", "Output format. Supported formats: json|yaml")
+	command.Flags().BoolVarP(&o.allNamespaces, "all-namespaces", "A", false, "If present, list ResourceImports across all Namespaces")
+
+	GetCmd.AddCommand(command)
+}
+
+func runE(cmd *cobra.Command, args []string) error {
+	options.validateAndComplete()
+	argsNum := len(args)
+	if options.allNamespaces && argsNum > 0 {
+		return fmt.Errorf("a resource cannot be retrieved by name across all Namespaces")
+	}
+
+	kubeconfig, err := raw.ResolveKubeconfig(cmd)
+	if err != nil {
+		return err
+	}
+	kubeconfig.GroupVersion = &schema.GroupVersion{Group: "", Version: ""}
+	restconfigTmpl := rest.CopyConfig(kubeconfig)
+	raw.SetupKubeconfig(restconfigTmpl)
+
+	scheme := k8sruntime.NewScheme()
+	err = mcsscheme.AddToScheme(scheme)
+	if err != nil {
+		return err
+	}
+	err = antreamcscheme.AddToScheme(scheme)
+	if err != nil {
+		return err
+	}
+	err = k8sscheme.AddToScheme(scheme)
+	if err != nil {
+		return err
+	}
+	k8sClient, err := client.New(kubeconfig, client.Options{Scheme: scheme})
+	if err != nil {
+		return err
+	}
+
+	var outputType string
+	if argsNum > 0 {
+		outputType = singleType
+	} else {
+		outputType = multipleType
+	}
+
+	var res interface{}
+	switch outputType {
+	case singleType:
+		resourceImportName := args[0]
+		resourceImport := multiclusterv1alpha1.ResourceImport{}
+		err = k8sClient.Get(context.TODO(), types.NamespacedName{
+			Namespace: options.namespace,
+			Name:      resourceImportName,
+		}, &resourceImport)
+		if err != nil {
+			if apierrors.IsNotFound(err) {
+				return fmt.Errorf("ResourceImport %s not found in Namespace %s", resourceImportName, options.namespace)
+			}
+
+			return err
+		}
+		res = resourceImport
+	case multipleType:
+		resourceImportList := &multiclusterv1alpha1.ResourceImportList{}
+		err = k8sClient.List(context.TODO(), resourceImportList, &client.ListOptions{Namespace: options.namespace})
+		if err != nil {
+			return err
+		}
+
+		if len(resourceImportList.Items) == 0 {
+			if options.namespace != "" {
+				fmt.Printf("No resource found in Namespace %s\n", options.namespace)
+			} else {
+				fmt.Println("No resource found in all Namespaces")
+			}
+			return nil
+		}
+		res = resourceImportList.Items
+	}
+
+	switch options.outputFormat {
+	case "json":
+		prettyJson, err := jsonOutput(res)
+		if err != nil {
+			return err
+		}
+		fmt.Println(prettyJson.String())
+	case "yaml":
+		yamlByte, err := yamlOutput(res)
+		if err != nil {
+			return err
+		}
+		fmt.Println(string(yamlByte))
+	default:
+		if outputType == singleType {
+			r := res.(multiclusterv1alpha1.ResourceImport)
+			fmt.Print(resourceImportOutput([]multiclusterv1alpha1.ResourceImport{r}))
+		} else {
+			r := res.([]multiclusterv1alpha1.ResourceImport)
+			fmt.Print(resourceImportOutput(r))
+		}
+	}
+
+	return nil
+}
+
+func resourceImportOutput(resourceImports []multiclusterv1alpha1.ResourceImport) string {
+	var output strings.Builder
+	formatter := "%-25s%-100s%-25s\n"
+	output.Write([]byte(fmt.Sprintf(formatter, "NAMESPACE", "NAME", "KIND")))
+	sort.SliceStable(resourceImports, func(i, j int) bool {
+		return strings.Compare(resourceImports[i].Namespace, resourceImports[j].Namespace) == 1
+	})
+
+	for _, ri := range resourceImports {
+		fmt.Fprintf(&output, formatter, ri.Namespace, ri.Name, ri.Spec.Kind)
+	}
+
+	return output.String()
+}