Merge pull request #24016 from XiaoningDing/federation-kubectl

Automatic merge from submit-queue

Federation kubectl for clusters

add federation/clusters resource to kubectl
#23653, requires #23847

<!-- Reviewable:start -->
---
This change is [<img src="http://reviewable.k8s.io/review_button.svg" height="35" align="absmiddle" alt="Reviewable"/>](http://reviewable.k8s.io/reviews/kubernetes/kubernetes/24016)
<!-- Reviewable:end -->

pkg/kubectl/describe.go

@@ -29,6 +29,8 @@ import (
 	"time"
 
 	"github.com/golang/glog"
+	"k8s.io/kubernetes/federation/apis/federation"
+	fed_clientset "k8s.io/kubernetes/federation/client/clientset_generated/federation_internalclientset"
 	"k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/api/errors"
 	"k8s.io/kubernetes/pkg/api/resource"
@@ -2026,6 +2028,63 @@ func describeConfigMap(configMap *api.ConfigMap) (string, error) {
 	})
 }
 
+type ClusterDescriber struct {
+	fed_clientset.Interface
+}
+
+func (d *ClusterDescriber) Describe(namespace, name string, describerSettings DescriberSettings) (string, error) {
+	cluster, err := d.Federation().Clusters().Get(name)
+	if err != nil {
+		return "", err
+	}
+	return describeCluster(cluster)
+}
+
+func describeCluster(cluster *federation.Cluster) (string, error) {
+	return tabbedString(func(out io.Writer) error {
+		fmt.Fprintf(out, "Name:\t%s\n", cluster.Name)
+		fmt.Fprintf(out, "Labels:\t%s\n", labels.FormatLabels(cluster.Labels))
+
+		fmt.Fprintf(out, "ServerAddressByClientCIDRs:\n  ClientCIDR\tServerAddress\n")
+		fmt.Fprintf(out, "  ----\t----\n")
+		for _, cidrAddr := range cluster.Spec.ServerAddressByClientCIDRs {
+			fmt.Fprintf(out, "  %v \t%v\n\n", cidrAddr.ClientCIDR, cidrAddr.ServerAddress)
+		}
+
+		if len(cluster.Status.Conditions) > 0 {
+			fmt.Fprint(out, "Conditions:\n  Type\tStatus\tLastUpdateTime\tLastTransitionTime\tReason\tMessage\n")
+			fmt.Fprint(out, "  ----\t------\t-----------------\t------------------\t------\t-------\n")
+			for _, c := range cluster.Status.Conditions {
+				fmt.Fprintf(out, "  %v \t%v \t%s \t%s \t%v \t%v\n",
+					c.Type,
+					c.Status,
+					c.LastProbeTime.Time.Format(time.RFC1123Z),
+					c.LastTransitionTime.Time.Format(time.RFC1123Z),
+					c.Reason,
+					c.Message)
+			}
+		}
+
+		fmt.Fprintf(out, "Version:\t%s\n", cluster.Status.Version)
+
+		if len(cluster.Status.Capacity) > 0 {
+			fmt.Fprintf(out, "Capacity:\n")
+			for resource, value := range cluster.Status.Capacity {
+				fmt.Fprintf(out, " %s:\t%s\n", resource, value.String())
+			}
+		}
+
+		if len(cluster.Status.Allocatable) > 0 {
+			fmt.Fprintf(out, "Allocatable:\n")
+			for resource, value := range cluster.Status.Allocatable {
+				fmt.Fprintf(out, " %s:\t%s\n", resource, value.String())
+			}
+		}
+
+		return nil
+	})
+}
+
 // newErrNoDescriber creates a new ErrNoDescriber with the names of the provided types.
 func newErrNoDescriber(types ...reflect.Type) error {
 	names := []string{}