Add cmd to list plugins (#1535)

* Add cmd to list plugins

Signed-off-by: Carlisia <carlisiac@vmware.com>

pkg/cmd/cli/serverstatus/server_status.go

@@ -0,0 +1,94 @@
+/*
+Copyright 2019 the Velero contributors.
+
+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 serverstatus
+
+import (
+	"time"
+
+	"github.com/pkg/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/watch"
+
+	velerov1api "github.com/heptio/velero/pkg/apis/velero/v1"
+	velerov1client "github.com/heptio/velero/pkg/generated/clientset/versioned/typed/velero/v1"
+	"github.com/heptio/velero/pkg/serverstatusrequest"
+)
+
+type ServerStatusGetter interface {
+	GetServerStatus(client velerov1client.ServerStatusRequestsGetter) (*velerov1api.ServerStatusRequest, error)
+}
+
+type DefaultServerStatusGetter struct {
+	Namespace string
+	Timeout   time.Duration
+}
+
+func (g *DefaultServerStatusGetter) GetServerStatus(client velerov1client.ServerStatusRequestsGetter) (*velerov1api.ServerStatusRequest, error) {
+	req := serverstatusrequest.NewBuilder().Namespace(g.Namespace).GenerateName("velero-cli-").ServerStatusRequest()
+
+	created, err := client.ServerStatusRequests(g.Namespace).Create(req)
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+	defer client.ServerStatusRequests(g.Namespace).Delete(created.Name, nil)
+
+	listOptions := metav1.ListOptions{
+		// TODO: once the minimum supported Kubernetes version is v1.9.0, uncomment the following line.
+		// See http://issue.k8s.io/51046 for details.
+		//FieldSelector:   "metadata.name=" + req.Name
+		ResourceVersion: created.ResourceVersion,
+	}
+	watcher, err := client.ServerStatusRequests(g.Namespace).Watch(listOptions)
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+	defer watcher.Stop()
+
+	expired := time.NewTimer(g.Timeout)
+	defer expired.Stop()
+
+Loop:
+	for {
+		select {
+		case <-expired.C:
+			return nil, errors.New("timed out waiting for server status request to be processed")
+		case e := <-watcher.ResultChan():
+			updated, ok := e.Object.(*velerov1api.ServerStatusRequest)
+			if !ok {
+				return nil, errors.Errorf("unexpected type %T", e.Object)
+			}
+
+			// TODO: once the minimum supported Kubernetes version is v1.9.0, remove the following check.
+			// See http://issue.k8s.io/51046 for details.
+			if updated.Name != created.Name {
+				continue
+			}
+
+			switch e.Type {
+			case watch.Deleted:
+				return nil, errors.New("server status request was unexpectedly deleted")
+			case watch.Modified:
+				if updated.Status.Phase == velerov1api.ServerStatusRequestPhaseProcessed {
+					req = updated
+					break Loop
+				}
+			}
+		}
+	}
+
+	return req, nil
+}