Implement ReplicaSet client.

pkg/client/cache/listers.go

@@ -245,6 +245,62 @@ func (s *StoreToDeploymentLister) GetDeploymentsForRC(rc *api.ReplicationControl
 	return
 }
 
+// StoreToReplicaSetLister gives a store List and Exists methods. The store must contain only ReplicaSets.
+type StoreToReplicaSetLister struct {
+	Store
+}
+
+// Exists checks if the given ReplicaSet exists in the store.
+func (s *StoreToReplicaSetLister) Exists(rs *extensions.ReplicaSet) (bool, error) {
+	_, exists, err := s.Store.Get(rs)
+	if err != nil {
+		return false, err
+	}
+	return exists, nil
+}
+
+// List lists all ReplicaSets in the store.
+// TODO: converge on the interface in pkg/client
+func (s *StoreToReplicaSetLister) List() (rss []extensions.ReplicaSet, err error) {
+	for _, rs := range s.Store.List() {
+		rss = append(rss, *(rs.(*extensions.ReplicaSet)))
+	}
+	return rss, nil
+}
+
+// GetPodReplicaSets returns a list of ReplicaSets managing a pod. Returns an error only if no matching ReplicaSets are found.
+func (s *StoreToReplicaSetLister) GetPodReplicaSets(pod *api.Pod) (rss []extensions.ReplicaSet, err error) {
+	var selector labels.Selector
+	var rs extensions.ReplicaSet
+
+	if len(pod.Labels) == 0 {
+		err = fmt.Errorf("no ReplicaSets found for pod %v because it has no labels", pod.Name)
+		return
+	}
+
+	for _, m := range s.Store.List() {
+		rs = *m.(*extensions.ReplicaSet)
+		if rs.Namespace != pod.Namespace {
+			continue
+		}
+		selector, err = extensions.LabelSelectorAsSelector(rs.Spec.Selector)
+		if err != nil {
+			err = fmt.Errorf("failed to convert pod selector to selector: %v", err)
+			return
+		}
+
+		// If a ReplicaSet with a nil or empty selector creeps in, it should match nothing, not everything.
+		if selector.Empty() || !selector.Matches(labels.Set(pod.Labels)) {
+			continue
+		}
+		rss = append(rss, rs)
+	}
+	if len(rss) == 0 {
+		err = fmt.Errorf("could not find ReplicaSet for pod %s in namespace %s with labels: %v", pod.Name, pod.Namespace, pod.Labels)
+	}
+	return
+}
+
 // StoreToDaemonSetLister gives a store List and Exists methods. The store must contain only DaemonSets.
 type StoreToDaemonSetLister struct {
 	Store

pkg/client/cache/listers_test.go

@@ -233,6 +233,118 @@ func TestStoreToReplicationControllerLister(t *testing.T) {
 	}
 }
 
+func TestStoreToReplicaSetLister(t *testing.T) {
+	store := NewStore(MetaNamespaceKeyFunc)
+	lister := StoreToReplicaSetLister{store}
+	testCases := []struct {
+		inRSs      []*extensions.ReplicaSet
+		list       func() ([]extensions.ReplicaSet, error)
+		outRSNames sets.String
+		expectErr  bool
+	}{
+		// Basic listing with all labels and no selectors
+		{
+			inRSs: []*extensions.ReplicaSet{
+				{ObjectMeta: api.ObjectMeta{Name: "basic"}},
+			},
+			list: func() ([]extensions.ReplicaSet, error) {
+				return lister.List()
+			},
+			outRSNames: sets.NewString("basic"),
+		},
+		// No pod labels
+		{
+			inRSs: []*extensions.ReplicaSet{
+				{
+					ObjectMeta: api.ObjectMeta{Name: "basic", Namespace: "ns"},
+					Spec: extensions.ReplicaSetSpec{
+						Selector: &extensions.LabelSelector{MatchLabels: map[string]string{"foo": "baz"}},
+					},
+				},
+			},
+			list: func() ([]extensions.ReplicaSet, error) {
+				pod := &api.Pod{
+					ObjectMeta: api.ObjectMeta{Name: "pod1", Namespace: "ns"},
+				}
+				return lister.GetPodReplicaSets(pod)
+			},
+			outRSNames: sets.NewString(),
+			expectErr:  true,
+		},
+		// No ReplicaSet selectors
+		{
+			inRSs: []*extensions.ReplicaSet{
+				{
+					ObjectMeta: api.ObjectMeta{Name: "basic", Namespace: "ns"},
+				},
+			},
+			list: func() ([]extensions.ReplicaSet, error) {
+				pod := &api.Pod{
+					ObjectMeta: api.ObjectMeta{
+						Name:      "pod1",
+						Namespace: "ns",
+						Labels:    map[string]string{"foo": "bar"},
+					},
+				}
+				return lister.GetPodReplicaSets(pod)
+			},
+			outRSNames: sets.NewString(),
+			expectErr:  true,
+		},
+		// Matching labels to selectors and namespace
+		{
+			inRSs: []*extensions.ReplicaSet{
+				{
+					ObjectMeta: api.ObjectMeta{Name: "foo"},
+					Spec: extensions.ReplicaSetSpec{
+						Selector: &extensions.LabelSelector{MatchLabels: map[string]string{"foo": "bar"}},
+					},
+				},
+				{
+					ObjectMeta: api.ObjectMeta{Name: "bar", Namespace: "ns"},
+					Spec: extensions.ReplicaSetSpec{
+						Selector: &extensions.LabelSelector{MatchLabels: map[string]string{"foo": "bar"}},
+					},
+				},
+			},
+			list: func() ([]extensions.ReplicaSet, error) {
+				pod := &api.Pod{
+					ObjectMeta: api.ObjectMeta{
+						Name:      "pod1",
+						Labels:    map[string]string{"foo": "bar"},
+						Namespace: "ns",
+					},
+				}
+				return lister.GetPodReplicaSets(pod)
+			},
+			outRSNames: sets.NewString("bar"),
+		},
+	}
+	for _, c := range testCases {
+		for _, r := range c.inRSs {
+			store.Add(r)
+		}
+
+		gotRSs, err := c.list()
+		if err != nil && c.expectErr {
+			continue
+		} else if c.expectErr {
+			t.Error("Expected error, got none")
+			continue
+		} else if err != nil {
+			t.Errorf("Unexpected error %#v", err)
+			continue
+		}
+		gotNames := make([]string, len(gotRSs))
+		for ix := range gotRSs {
+			gotNames[ix] = gotRSs[ix].Name
+		}
+		if !c.outRSNames.HasAll(gotNames...) || len(gotNames) != len(c.outRSNames) {
+			t.Errorf("Unexpected got ReplicaSets %+v expected %+v", gotNames, c.outRSNames)
+		}
+	}
+}
+
 func TestStoreToDaemonSetLister(t *testing.T) {
 	store := NewStore(MetaNamespaceKeyFunc)
 	lister := StoreToDaemonSetLister{store}

pkg/client/unversioned/conditions.go

@@ -101,6 +101,29 @@ func ControllerHasDesiredReplicas(c Interface, controller *api.ReplicationContro
 	}
 }
 
+// ReplicaSetHasDesiredReplicas returns a condition that will be true if and only if
+// the desired replica count for a ReplicaSet's ReplicaSelector equals the Replicas count.
+func ReplicaSetHasDesiredReplicas(c ExtensionsInterface, replicaSet *extensions.ReplicaSet) wait.ConditionFunc {
+
+	// If we're given a ReplicaSet where the status lags the spec, it either means that the
+	// ReplicaSet is stale, or that the ReplicaSet manager hasn't noticed the update yet.
+	// Polling status.Replicas is not safe in the latter case.
+	desiredGeneration := replicaSet.Generation
+
+	return func() (bool, error) {
+		rs, err := c.ReplicaSets(replicaSet.Namespace).Get(replicaSet.Name)
+		if err != nil {
+			return false, err
+		}
+		// There's a chance a concurrent update modifies the Spec.Replicas causing this check to
+		// pass, or, after this check has passed, a modification causes the ReplicaSet manager to
+		// create more pods. This will not be an issue once we've implemented graceful delete for
+		// ReplicaSets, but till then concurrent stop operations on the same ReplicaSet might have
+		// unintended side effects.
+		return rs.Status.ObservedGeneration >= desiredGeneration && rs.Status.Replicas == rs.Spec.Replicas, nil
+	}
+}
+
 // JobHasDesiredParallelism returns a condition that will be true if the desired parallelism count
 // for a job equals the current active counts or is less by an appropriate successful/unsuccessful count.
 func JobHasDesiredParallelism(c ExtensionsInterface, job *extensions.Job) wait.ConditionFunc {

pkg/client/unversioned/extensions.go

@@ -34,6 +34,7 @@ type ExtensionsInterface interface {
 	JobsNamespacer
 	IngressNamespacer
 	ThirdPartyResourceNamespacer
+	ReplicaSetsNamespacer
 }
 
 // ExtensionsClient is used to interact with experimental Kubernetes features.
@@ -71,6 +72,10 @@ func (c *ExtensionsClient) ThirdPartyResources(namespace string) ThirdPartyResou
 	return newThirdPartyResources(c, namespace)
 }
 
+func (c *ExtensionsClient) ReplicaSets(namespace string) ReplicaSetInterface {
+	return newReplicaSets(c, namespace)
+}
+
 // NewExtensions creates a new ExtensionsClient for the given config. This client
 // provides access to experimental Kubernetes features.
 // Features of Extensions group are not supported and may be changed or removed in

pkg/client/unversioned/replica_sets.go

@@ -0,0 +1,100 @@
+/*
+Copyright 2016 The Kubernetes Authors All rights reserved.
+
+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 unversioned
+
+import (
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/apis/extensions"
+	"k8s.io/kubernetes/pkg/watch"
+)
+
+// ReplicaSetsNamespacer has methods to work with ReplicaSet resources in a namespace
+type ReplicaSetsNamespacer interface {
+	ReplicaSets(namespace string) ReplicaSetInterface
+}
+
+// ReplicaSetInterface has methods to work with ReplicaSet resources.
+type ReplicaSetInterface interface {
+	List(opts api.ListOptions) (*extensions.ReplicaSetList, error)
+	Get(name string) (*extensions.ReplicaSet, error)
+	Create(ctrl *extensions.ReplicaSet) (*extensions.ReplicaSet, error)
+	Update(ctrl *extensions.ReplicaSet) (*extensions.ReplicaSet, error)
+	UpdateStatus(ctrl *extensions.ReplicaSet) (*extensions.ReplicaSet, error)
+	Delete(name string, options *api.DeleteOptions) error
+	Watch(opts api.ListOptions) (watch.Interface, error)
+}
+
+// replicaSets implements ReplicaSetsNamespacer interface
+type replicaSets struct {
+	client *ExtensionsClient
+	ns     string
+}
+
+// newReplicaSets returns a ReplicaSetClient
+func newReplicaSets(c *ExtensionsClient, namespace string) *replicaSets {
+	return &replicaSets{c, namespace}
+}
+
+// List takes a selector, and returns the list of ReplicaSets that match that selector.
+func (c *replicaSets) List(opts api.ListOptions) (result *extensions.ReplicaSetList, err error) {
+	result = &extensions.ReplicaSetList{}
+	err = c.client.Get().Namespace(c.ns).Resource("replicasets").VersionedParams(&opts, api.Scheme).Do().Into(result)
+	return
+}
+
+// Get returns information about a particular ReplicaSet.
+func (c *replicaSets) Get(name string) (result *extensions.ReplicaSet, err error) {
+	result = &extensions.ReplicaSet{}
+	err = c.client.Get().Namespace(c.ns).Resource("replicasets").Name(name).Do().Into(result)
+	return
+}
+
+// Create creates a new ReplicaSet.
+func (c *replicaSets) Create(rs *extensions.ReplicaSet) (result *extensions.ReplicaSet, err error) {
+	result = &extensions.ReplicaSet{}
+	err = c.client.Post().Namespace(c.ns).Resource("replicasets").Body(rs).Do().Into(result)
+	return
+}
+
+// Update updates an existing ReplicaSet.
+func (c *replicaSets) Update(rs *extensions.ReplicaSet) (result *extensions.ReplicaSet, err error) {
+	result = &extensions.ReplicaSet{}
+	err = c.client.Put().Namespace(c.ns).Resource("replicasets").Name(rs.Name).Body(rs).Do().Into(result)
+	return
+}
+
+// UpdateStatus updates an existing ReplicaSet status
+func (c *replicaSets) UpdateStatus(rs *extensions.ReplicaSet) (result *extensions.ReplicaSet, err error) {
+	result = &extensions.ReplicaSet{}
+	err = c.client.Put().Namespace(c.ns).Resource("replicasets").Name(rs.Name).SubResource("status").Body(rs).Do().Into(result)
+	return
+}
+
+// Delete deletes an existing ReplicaSet.
+func (c *replicaSets) Delete(name string, options *api.DeleteOptions) (err error) {
+	return c.client.Delete().Namespace(c.ns).Resource("replicasets").Name(name).Body(options).Do().Error()
+}
+
+// Watch returns a watch.Interface that watches the requested ReplicaSets.
+func (c *replicaSets) Watch(opts api.ListOptions) (watch.Interface, error) {
+	return c.client.Get().
+		Prefix("watch").
+		Namespace(c.ns).
+		Resource("replicasets").
+		VersionedParams(&opts, api.Scheme).
+		Watch()
+}