feat: add support for egctl x status

internal/cmd/egctl/experimental.go

@@ -22,8 +22,9 @@
 	  `,
 	}
 
-	experimentalCommand.AddCommand(NewTranslateCommand())
-	experimentalCommand.AddCommand(statsCommand())
+	experimentalCommand.AddCommand(newTranslateCommand())
+	experimentalCommand.AddCommand(newStatsCommand())
+	experimentalCommand.AddCommand(newStatusCommand())
 
 	return experimentalCommand
 }

internal/cmd/egctl/stats.go

@@ -9,7 +9,7 @@
 	"github.com/spf13/cobra"
 )
 
-func statsCommand() *cobra.Command {
+func newStatsCommand() *cobra.Command {
 	c := &cobra.Command{
 		Use:   "stats",
 		Long:  "Retrieve statistics from envoy proxy.",

internal/cmd/egctl/status.go

@@ -0,0 +1,324 @@
+// Copyright Envoy Gateway Authors
+// SPDX-License-Identifier: Apache-2.0
+// The full text of the Apache license is available in the LICENSE file at
+// the root of the repo.
+
+package egctl
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"os"
+	"reflect"
+	"strconv"
+	"strings"
+	"text/tabwriter"
+
+	"github.com/spf13/cobra"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	gwv1 "sigs.k8s.io/gateway-api/apis/v1"
+	gwv1a2 "sigs.k8s.io/gateway-api/apis/v1alpha2"
+
+	egv1a1 "github.com/envoyproxy/gateway/api/v1alpha1"
+)
+
+func newStatusCommand() *cobra.Command {
+	var (
+		quiet, verbose, allNamespaces bool
+		resourceType, namespace       string
+	)
+
+	statusCommand := &cobra.Command{
+		Use:   "status",
+		Short: "Show the summary of the status of resources in Envoy Gateway",
+		Example: `  # Show the status of gatewayclass resources under default namespace.
+  egctl x status gatewayclass
+
+  # Show the status of gateway resources with less information under default namespace.
+  egctl x status gateway -q
+
+  # Show the status of gateway resources with details under default namespace.
+  egctl x status gateway -v
+
+  # Show the status of httproute resources with details under a specific namespace.
+  egctl x status httproute -v -n foobar
+
+  # Show the status of httproute resources under all namespaces.
+  egctl x status httproute -A
+	`,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			ctx := context.Background()
+
+			table := newStatusTableWriter(os.Stdout)
+			k8sClient, err := newK8sClient()
+			if err != nil {
+				return err
+			}
+
+			switch {
+			case len(args) == 1:
+				resourceType = args[0]
+			case len(args) > 1:
+				return fmt.Errorf("unknown args: %s", strings.Join(args[1:], ","))
+			default:
+				return fmt.Errorf("invalid args: must specific a resources type")
+			}
+
+			return runStatus(ctx, k8sClient, table, resourceType, namespace, quiet, verbose, allNamespaces)
+		},
+	}
+
+	statusCommand.PersistentFlags().BoolVarP(&quiet, "quiet", "q", false, "Show the status of resources only")
+	statusCommand.PersistentFlags().BoolVarP(&verbose, "verbose", "v", false, "Show the status of resources with details")
+	statusCommand.PersistentFlags().BoolVarP(&allNamespaces, "all-namespaces", "A", false, "Get resources from all namespaces")
+	statusCommand.PersistentFlags().StringVarP(&namespace, "namespace", "n", "default", "Specific a namespace to get resources")
+
+	return statusCommand
+}
+
+func newStatusTableWriter(out io.Writer) *tabwriter.Writer {
+	return tabwriter.NewWriter(out, 10, 0, 3, ' ', 0)
+}
+
+func runStatus(ctx context.Context, cli client.Client, table *tabwriter.Writer, resourceType, namespace string, quiet, verbose, allNamespaces bool) error {
+	var resourcesList client.ObjectList
+
+	if allNamespaces {
+		namespace = ""
+	}
+
+	switch strings.ToLower(resourceType) {
+	case "gc", "gatewayclass":
+		gc := gwv1.GatewayClassList{}
+		if err := cli.List(ctx, &gc, client.InNamespace(namespace)); err != nil {
+			return err
+		}
+		resourcesList = &gc
+
+	case "gtw", "gateway":
+		gtw := gwv1.GatewayList{}
+		if err := cli.List(ctx, &gtw, client.InNamespace(namespace)); err != nil {
+			return err
+		}
+		resourcesList = &gtw
+
+	case "httproute":
+		httproute := gwv1.HTTPRouteList{}
+		if err := cli.List(ctx, &httproute, client.InNamespace(namespace)); err != nil {
+			return err
+		}
+		resourcesList = &httproute
+
+	case "grpcroute":
+		grpcroute := gwv1a2.GRPCRouteList{}
+		if err := cli.List(ctx, &grpcroute, client.InNamespace(namespace)); err != nil {
+			return err
+		}
+		resourcesList = &grpcroute
+
+	case "tcproute":
+		tcproute := gwv1a2.TCPRouteList{}
+		if err := cli.List(ctx, &tcproute, client.InNamespace(namespace)); err != nil {
+			return err
+		}
+		resourcesList = &tcproute
+
+	case "udproute":
+		udproute := gwv1a2.UDPRouteList{}
+		if err := cli.List(ctx, &udproute, client.InNamespace(namespace)); err != nil {
+			return err
+		}
+		resourcesList = &udproute
+
+	case "tlsroute":
+		tlsroute := gwv1a2.TLSRouteList{}
+		if err := cli.List(ctx, &tlsroute, client.InNamespace(namespace)); err != nil {
+			return err
+		}
+		resourcesList = &tlsroute
+
+	case "btlspolicy", "backendtlspolicy":
+		btlspolicy := gwv1a2.BackendTLSPolicyList{}
+		if err := cli.List(ctx, &btlspolicy, client.InNamespace(namespace)); err != nil {
+			return err
+		}
+		resourcesList = &btlspolicy
+
+	case "btp", "backendtrafficpolicy":
+		btp := egv1a1.BackendTrafficPolicyList{}
+		if err := cli.List(ctx, &btp, client.InNamespace(namespace)); err != nil {
+			return err
+		}
+		resourcesList = &btp
+
+	case "ctp", "clienttrafficpolicy":
+		ctp := egv1a1.ClientTrafficPolicyList{}
+		if err := cli.List(ctx, &ctp, client.InNamespace(namespace)); err != nil {
+			return err
+		}
+		resourcesList = &ctp
+
+	case "epp", "enovypatchpolicy":
+		epp := egv1a1.EnvoyPatchPolicyList{}
+		if err := cli.List(ctx, &epp, client.InNamespace(namespace)); err != nil {
+			return err
+		}
+		resourcesList = &epp
+
+	case "sp", "securitypolicy":
+		sp := egv1a1.SecurityPolicyList{}
+		if err := cli.List(ctx, &sp, client.InNamespace(namespace)); err != nil {
+			return err
+		}
+		resourcesList = &sp
+
+	default:
+		return fmt.Errorf("unknown resource type: %s", resourceType)
+	}
+
+	namespaced, err := cli.IsObjectNamespaced(resourcesList)
+	if err != nil {
+		return err
+	}
+
+	needNamespaceHeader := allNamespaces && namespaced
+	writeStatusHeaders(table, verbose, needNamespaceHeader)
+
+	if err = writeStatusBodies(table, resourcesList, resourceType, quiet, verbose, needNamespaceHeader); err != nil {
+		return err
+	}
+
+	return table.Flush()
+}
+
+func writeStatusHeaders(table *tabwriter.Writer, verbose, needNamespace bool) {
+	headers := []string{"NAME", "TYPE", "STATUS", "REASON"}
+
+	if needNamespace {
+		headers = append([]string{"NAMESPACE"}, headers...)
+	}
+	if verbose {
+		headers = append(headers, []string{"MESSAGE", "OBSERVED GENERATION", "LAST TRANSITION TIME"}...)
+	}
+
+	fmt.Fprintln(table, strings.Join(headers, "\t"))
+}
+
+func writeStatusBodies(table *tabwriter.Writer, resourcesList client.ObjectList, resourceType string, quiet, verbose, needNamespace bool) error {
+	v := reflect.ValueOf(resourcesList).Elem()
+
+	itemsField := v.FieldByName("Items")
+	if !itemsField.IsValid() {
+		return fmt.Errorf("failed to load `.Items` field from %s", resourceType)
+	}
+
+	for i := 0; i < itemsField.Len(); i++ {
+		item := itemsField.Index(i)
+
+		var name, namespace string
+		nameField := item.FieldByName("Name")
+		if !nameField.IsValid() {
+			return fmt.Errorf("failed to find `.Items[i].Name` field from %s", resourceType)
+		}
+		name = nameField.String()
+
+		if needNamespace {
+			namespaceField := item.FieldByName("Namespace")
+			if !namespaceField.IsValid() {
+				return fmt.Errorf("failed to find `.Items[i].Namespace` field from %s", resourceType)
+			}
+			namespace = namespaceField.String()
+		}
+
+		statusField := item.FieldByName("Status")
+		if !statusField.IsValid() {
+			return fmt.Errorf("failed to find `.Items[i].Status` field from %s", resourceType)
+		}
+
+		// Different resources store the conditions at different position.
+		switch {
+		case strings.Contains(resourceType, "route"):
+			// Scrape conditions from `Resource.Status.Parents[i].Conditions` field
+			parentsField := statusField.FieldByName("Parents")
+			if !parentsField.IsValid() {
+				return fmt.Errorf("failed to find `.Items[i].Status.Parents` field from %s", resourceType)
+			}
+
+			for j := 0; j < parentsField.Len(); j++ {
+				parentItem := parentsField.Index(j)
+				if err := findAndWriteConditions(table, parentItem, resourceType, name, namespace, quiet, verbose, needNamespace); err != nil {
+					return err
+				}
+			}
+
+		case resourceType == "btlspolicy" || resourceType == "backendtlspolicy":
+			// Scrape conditions from `Resource.Status.Ancestors[i].Conditions` field
+			ancestorsField := statusField.FieldByName("Ancestors")
+			if !ancestorsField.IsValid() {
+				return fmt.Errorf("failed to find `.Items[i].Status.Ancestors` field from %s", resourceType)
+			}
+
+			for j := 0; j < ancestorsField.Len(); j++ {
+				ancestorItem := ancestorsField.Index(j)
+				if err := findAndWriteConditions(table, ancestorItem, resourceType, name, namespace, quiet, verbose, needNamespace); err != nil {
+					return err
+				}
+			}
+
+		default:
+			// Scrape conditions from `Resource.Status.Conditions` field
+			if err := findAndWriteConditions(table, statusField, resourceType, name, namespace, quiet, verbose, needNamespace); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+func findAndWriteConditions(table *tabwriter.Writer, parent reflect.Value, resourceType, name, namespace string, quiet, verbose, needNamespace bool) error {
+	conditionsField := parent.FieldByName("Conditions")
+	if !conditionsField.IsValid() {
+		return fmt.Errorf("failed to find `Conditions` field for %s", resourceType)
+	}
+
+	conditions := conditionsField.Interface().([]metav1.Condition)
+	writeConditions(table, conditions, name, namespace, quiet, verbose, needNamespace)
+
+	return nil
+}
+
+func writeConditions(table *tabwriter.Writer, conditions []metav1.Condition, name, namespace string, quiet, verbose, needNamespace bool) {
+	// Sort in descending order by time of each condition.
+	for i := len(conditions) - 1; i >= 0; i-- {
+		if i < len(conditions)-1 {
+			name, namespace = "", ""
+		}
+
+		writeCondition(table, conditions[i], name, namespace, verbose, needNamespace)
+
+		if quiet {
+			break
+		}
+	}
+}
+
+func writeCondition(table *tabwriter.Writer, condition metav1.Condition, name, namespace string, verbose, needNamespace bool) {
+	row := []string{name, condition.Type, string(condition.Status), condition.Reason}
+
+	// Write conditions corresponding to its headers.
+	if needNamespace {
+		row = append([]string{namespace}, row...)
+	}
+	if verbose {
+		row = append(row, []string{
+			condition.Message,
+			strconv.FormatInt(condition.ObservedGeneration, 10),
+			condition.LastTransitionTime.String(),
+		}...)
+	}
+
+	fmt.Fprintln(table, strings.Join(row, "\t"))
+}