show server version in ark version output using ServerStatusRequest CRD

Signed-off-by: Steve Kriss <steve@heptio.com>

pkg/controller/server_status_request_controller.go

@@ -0,0 +1,118 @@
+/*
+Copyright 2018 the Heptio Ark 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 controller
+
+import (
+	"time"
+
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/labels"
+	"k8s.io/apimachinery/pkg/util/clock"
+	"k8s.io/client-go/tools/cache"
+
+	arkv1api "github.com/heptio/ark/pkg/apis/ark/v1"
+	arkv1client "github.com/heptio/ark/pkg/generated/clientset/versioned/typed/ark/v1"
+	arkv1informers "github.com/heptio/ark/pkg/generated/informers/externalversions/ark/v1"
+	arkv1listers "github.com/heptio/ark/pkg/generated/listers/ark/v1"
+	"github.com/heptio/ark/pkg/serverstatusrequest"
+	kubeutil "github.com/heptio/ark/pkg/util/kube"
+)
+
+const statusRequestResyncPeriod = 5 * time.Minute
+
+type statusRequestController struct {
+	*genericController
+
+	client arkv1client.ServerStatusRequestsGetter
+	lister arkv1listers.ServerStatusRequestLister
+	clock  clock.Clock
+}
+
+func NewServerStatusRequestController(
+	logger logrus.FieldLogger,
+	client arkv1client.ServerStatusRequestsGetter,
+	informer arkv1informers.ServerStatusRequestInformer,
+) *statusRequestController {
+	c := &statusRequestController{
+		genericController: newGenericController("serverstatusrequest", logger),
+		client:            client,
+		lister:            informer.Lister(),
+
+		clock: clock.RealClock{},
+	}
+
+	c.syncHandler = c.processItem
+	c.cacheSyncWaiters = append(c.cacheSyncWaiters, informer.Informer().HasSynced)
+
+	c.resyncFunc = c.enqueueAllItems
+	c.resyncPeriod = statusRequestResyncPeriod
+
+	informer.Informer().AddEventHandler(
+		cache.ResourceEventHandlerFuncs{
+			AddFunc: func(obj interface{}) {
+				req := obj.(*arkv1api.ServerStatusRequest)
+				key := kubeutil.NamespaceAndName(req)
+
+				c.logger.WithFields(logrus.Fields{
+					"serverStatusRequest": key,
+					"phase":               req.Status.Phase,
+				}).Debug("Enqueueing server status request")
+
+				c.queue.Add(key)
+			},
+		},
+	)
+
+	return c
+}
+
+func (c *statusRequestController) processItem(key string) error {
+	log := c.logger.WithField("key", key)
+
+	log.Debug("Running processItem")
+	ns, name, err := cache.SplitMetaNamespaceKey(key)
+	if err != nil {
+		return errors.Wrap(err, "error splitting queue key")
+	}
+
+	log.Debug("Getting ServerStatusRequest")
+	req, err := c.lister.ServerStatusRequests(ns).Get(name)
+	// server status request no longer exists
+	if apierrors.IsNotFound(err) {
+		log.WithError(err).Debug("ServerStatusRequest not found")
+		return nil
+	}
+	if err != nil {
+		return errors.Wrap(err, "error getting ServerStatusRequest")
+	}
+
+	return serverstatusrequest.Process(req.DeepCopy(), c.client, c.clock, log)
+}
+
+func (c *statusRequestController) enqueueAllItems() {
+	items, err := c.lister.List(labels.Everything())
+	if err != nil {
+		c.logger.WithError(err).Error("Error listing all server status requests")
+		return
+	}
+
+	for _, req := range items {
+		c.enqueue(req)
+	}
+}