List RSes once when getting old/new RSes in deployment e2e tests

pkg/kubectl/describe.go

@@ -1922,12 +1922,9 @@ func (dd *DeploymentDescriber) Describe(namespace, name string, describerSetting
 			ru := d.Spec.Strategy.RollingUpdate
 			fmt.Fprintf(out, "RollingUpdateStrategy:\t%s max unavailable, %s max surge\n", ru.MaxUnavailable.String(), ru.MaxSurge.String())
 		}
-		oldRSs, _, err := deploymentutil.GetOldReplicaSets(d, dd)
+		oldRSs, _, newRS, err := deploymentutil.GetAllReplicaSets(d, dd)
 		if err == nil {
 			fmt.Fprintf(out, "OldReplicaSets:\t%s\n", printReplicaSetsByLabels(oldRSs))
-		}
-		newRS, err := deploymentutil.GetNewReplicaSet(d, dd)
-		if err == nil {
 			var newRSs []*extensions.ReplicaSet
 			if newRS != nil {
 				newRSs = append(newRSs, newRS)

pkg/kubectl/history.go

@@ -66,13 +66,9 @@ func (h *DeploymentHistoryViewer) History(namespace, name string) (HistoryInfo,
 	if err != nil {
 		return historyInfo, fmt.Errorf("failed to retrieve deployment %s: %v", name, err)
 	}
-	_, allOldRSs, err := deploymentutil.GetOldReplicaSets(deployment, h.c)
+	_, allOldRSs, newRS, err := deploymentutil.GetAllReplicaSets(deployment, h.c)
 	if err != nil {
-		return historyInfo, fmt.Errorf("failed to retrieve old replica sets from deployment %s: %v", name, err)
-	}
-	newRS, err := deploymentutil.GetNewReplicaSet(deployment, h.c)
-	if err != nil {
-		return historyInfo, fmt.Errorf("failed to retrieve new replica set from deployment %s: %v", name, err)
+		return historyInfo, fmt.Errorf("failed to retrieve replica sets from deployment %s: %v", name, err)
 	}
 	allRSs := allOldRSs
 	if newRS != nil {

pkg/util/deployment/deployment.go

@@ -45,41 +45,70 @@ const (
 	RollbackRevisionNotFound  = "DeploymentRollbackRevisionNotFound"
 	RollbackTemplateUnchanged = "DeploymentRollbackTemplateUnchanged"
 	RollbackDone              = "DeploymentRollback"
+
+	all getReplicaSetType = "All"
+	old getReplicaSetType = "Old"
+	new getReplicaSetType = "New"
 )
 
+type getReplicaSetType string
+
+// GetAllReplicaSets returns the old and new replica sets targeted by the given Deployment. It gets PodList and ReplicaSetList from client interface.
+// Note that the first set of old replica sets doesn't include the ones with no pods, and the second set of old replica sets include all old replica sets.
+// The third returned value is the new replica set, and it may be nil if it doesn't exist yet.
+func GetAllReplicaSets(deployment *extensions.Deployment, c clientset.Interface) ([]*extensions.ReplicaSet, []*extensions.ReplicaSet, *extensions.ReplicaSet, error) {
+	return getReplicaSets(deployment, c, all)
+}
+
 // GetOldReplicaSets returns the old replica sets targeted by the given Deployment; get PodList and ReplicaSetList from client interface.
 // Note that the first set of old replica sets doesn't include the ones with no pods, and the second set of old replica sets include all old replica sets.
 func GetOldReplicaSets(deployment *extensions.Deployment, c clientset.Interface) ([]*extensions.ReplicaSet, []*extensions.ReplicaSet, error) {
-	rsList, err := ListReplicaSets(deployment,
-		func(namespace string, options api.ListOptions) ([]extensions.ReplicaSet, error) {
-			rsList, err := c.Extensions().ReplicaSets(namespace).List(options)
-			return rsList.Items, err
-		})
-	if err != nil {
-		return nil, nil, fmt.Errorf("error listing ReplicaSets: %v", err)
-	}
-	podList, err := ListPods(deployment,
-		func(namespace string, options api.ListOptions) (*api.PodList, error) {
-			return c.Core().Pods(namespace).List(options)
-		})
-	if err != nil {
-		return nil, nil, fmt.Errorf("error listing Pods: %v", err)
-	}
-	return FindOldReplicaSets(deployment, rsList, podList)
+	oldRSes, allOldRSes, _, err := getReplicaSets(deployment, c, old)
+	return oldRSes, allOldRSes, err
 }
 
 // GetNewReplicaSet returns a replica set that matches the intent of the given deployment; get ReplicaSetList from client interface.
 // Returns nil if the new replica set doesn't exist yet.
 func GetNewReplicaSet(deployment *extensions.Deployment, c clientset.Interface) (*extensions.ReplicaSet, error) {
+	_, _, newRS, err := getReplicaSets(deployment, c, new)
+	return newRS, err
+}
+
+func getReplicaSets(deployment *extensions.Deployment, c clientset.Interface, getType getReplicaSetType) (oldRSes []*extensions.ReplicaSet, allOldRSes []*extensions.ReplicaSet, newRS *extensions.ReplicaSet, err error) {
+	// List all RSes
 	rsList, err := ListReplicaSets(deployment,
 		func(namespace string, options api.ListOptions) ([]extensions.ReplicaSet, error) {
 			rsList, err := c.Extensions().ReplicaSets(namespace).List(options)
 			return rsList.Items, err
 		})
 	if err != nil {
-		return nil, fmt.Errorf("error listing ReplicaSets: %v", err)
+		return nil, nil, nil, fmt.Errorf("error listing ReplicaSets: %v", err)
 	}
-	return FindNewReplicaSet(deployment, rsList)
+
+	// Skip getting old replica sets when we only need new replica set
+	if getType != new {
+		// List all pods
+		podList, err := ListPods(deployment,
+			func(namespace string, options api.ListOptions) (*api.PodList, error) {
+				return c.Core().Pods(namespace).List(options)
+			})
+		if err != nil {
+			return nil, nil, nil, fmt.Errorf("error listing Pods: %v", err)
+		}
+		oldRSes, allOldRSes, err = FindOldReplicaSets(deployment, rsList, podList)
+		if err != nil {
+			return nil, nil, nil, fmt.Errorf("error getting old ReplicaSets: %v", err)
+		}
+	}
+
+	// Skip getting new replica set when we only need old replica sets
+	if getType != old {
+		newRS, err = FindNewReplicaSet(deployment, rsList)
+		if err != nil {
+			return nil, nil, nil, fmt.Errorf("error getting new ReplicaSet: %v", err)
+		}
+	}
+	return oldRSes, allOldRSes, newRS, nil
 }
 
 // TODO: switch this to full namespacers

test/e2e/deployment.go

@@ -927,13 +927,11 @@ func testDeploymentLabelAdopted(f *framework.Framework) {
 	// There should be no old RSs (overlapping RS)
 	deployment, err := c.Extensions().Deployments(ns).Get(deploymentName)
 	Expect(err).NotTo(HaveOccurred())
-	oldRSs, allOldRSs, err := deploymentutil.GetOldReplicaSets(deployment, c)
+	oldRSs, allOldRSs, newRS, err := deploymentutil.GetAllReplicaSets(deployment, c)
 	Expect(err).NotTo(HaveOccurred())
 	Expect(len(oldRSs)).Should(Equal(0))
 	Expect(len(allOldRSs)).Should(Equal(0))
 	// New RS should contain pod-template-hash in its selector, label, and template label
-	newRS, err := deploymentutil.GetNewReplicaSet(deployment, c)
-	Expect(err).NotTo(HaveOccurred())
 	err = framework.CheckRSHashLabel(newRS)
 	Expect(err).NotTo(HaveOccurred())
 	// All pods targeted by the deployment should contain pod-template-hash in their labels, and there should be only 3 pods

test/e2e/framework/util.go

@@ -2834,11 +2834,7 @@ func WaitForDeploymentStatus(c clientset.Interface, ns, deploymentName string, d
 		if err != nil {
 			return false, err
 		}
-		oldRSs, allOldRSs, err = deploymentutil.GetOldReplicaSets(deployment, c)
-		if err != nil {
-			return false, err
-		}
-		newRS, err = deploymentutil.GetNewReplicaSet(deployment, c)
+		oldRSs, allOldRSs, newRS, err = deploymentutil.GetAllReplicaSets(deployment, c)
 		if err != nil {
 			return false, err
 		}