Merge pull request #12869 from vishh/daemon-registry-client

pkg/client/unversioned/cache/listers.go

@@ -225,6 +225,58 @@ func (s *StoreToReplicationControllerLister) GetPodControllers(pod *api.Pod) (co
 	return
 }
 
+// StoreToDaemonLister gives a store List and Exists methods. The store must contain only Daemons.
+type StoreToDaemonLister struct {
+	Store
+}
+
+// Exists checks if the given dc exists in the store.
+func (s *StoreToDaemonLister) Exists(daemon *api.Daemon) (bool, error) {
+	_, exists, err := s.Store.Get(daemon)
+	if err != nil {
+		return false, err
+	}
+	return exists, nil
+}
+
+// StoreToDaemonLister lists all daemons in the store.
+// TODO: converge on the interface in pkg/client
+func (s *StoreToDaemonLister) List() (daemons []api.Daemon, err error) {
+	for _, c := range s.Store.List() {
+		daemons = append(daemons, *(c.(*api.Daemon)))
+	}
+	return daemons, nil
+}
+
+// GetPodDaemons returns a list of daemons managing a pod. Returns an error iff no matching daemons are found.
+func (s *StoreToDaemonLister) GetPodDaemons(pod *api.Pod) (daemons []api.Daemon, err error) {
+	var selector labels.Selector
+	var daemonController api.Daemon
+
+	if len(pod.Labels) == 0 {
+		err = fmt.Errorf("No daemons found for pod %v because it has no labels", pod.Name)
+		return
+	}
+
+	for _, m := range s.Store.List() {
+		daemonController = *m.(*api.Daemon)
+		if daemonController.Namespace != pod.Namespace {
+			continue
+		}
+		selector = labels.Set(daemonController.Spec.Selector).AsSelector()
+
+		// If a daemonController with a nil or empty selector creeps in, it should match nothing, not everything.
+		if selector.Empty() || !selector.Matches(labels.Set(pod.Labels)) {
+			continue
+		}
+		daemons = append(daemons, daemonController)
+	}
+	if len(daemons) == 0 {
+		err = fmt.Errorf("Could not find daemons for pod %s in namespace %s with labels: %v", pod.Name, pod.Namespace, pod.Labels)
+	}
+	return
+}
+
 // StoreToServiceLister makes a Store that has the List method of the client.ServiceInterface
 // The Store must contain (only) Services.
 type StoreToServiceLister struct {

pkg/client/unversioned/cache/listers_test.go

@@ -64,7 +64,7 @@ func TestStoreToReplicationControllerLister(t *testing.T) {
 			},
 			outRCNames: util.NewStringSet("basic"),
 		},
-		// No pod lables
+		// No pod labels
 		{
 			inRCs: []*api.ReplicationController{
 				{
@@ -155,6 +155,128 @@ func TestStoreToReplicationControllerLister(t *testing.T) {
 	}
 }
 
+func TestStoreToDaemonLister(t *testing.T) {
+	store := NewStore(MetaNamespaceKeyFunc)
+	lister := StoreToDaemonLister{store}
+	testCases := []struct {
+		inDCs      []*api.Daemon
+		list       func() ([]api.Daemon, error)
+		outDCNames util.StringSet
+		expectErr  bool
+	}{
+		// Basic listing
+		{
+			inDCs: []*api.Daemon{
+				{ObjectMeta: api.ObjectMeta{Name: "basic"}},
+			},
+			list: func() ([]api.Daemon, error) {
+				return lister.List()
+			},
+			outDCNames: util.NewStringSet("basic"),
+		},
+		// Listing multiple controllers
+		{
+			inDCs: []*api.Daemon{
+				{ObjectMeta: api.ObjectMeta{Name: "basic"}},
+				{ObjectMeta: api.ObjectMeta{Name: "complex"}},
+				{ObjectMeta: api.ObjectMeta{Name: "complex2"}},
+			},
+			list: func() ([]api.Daemon, error) {
+				return lister.List()
+			},
+			outDCNames: util.NewStringSet("basic", "complex", "complex2"),
+		},
+		// No pod labels
+		{
+			inDCs: []*api.Daemon{
+				{
+					ObjectMeta: api.ObjectMeta{Name: "basic", Namespace: "ns"},
+					Spec: api.DaemonSpec{
+						Selector: map[string]string{"foo": "baz"},
+					},
+				},
+			},
+			list: func() ([]api.Daemon, error) {
+				pod := &api.Pod{
+					ObjectMeta: api.ObjectMeta{Name: "pod1", Namespace: "ns"},
+				}
+				return lister.GetPodDaemons(pod)
+			},
+			outDCNames: util.NewStringSet(),
+			expectErr:  true,
+		},
+		// No RC selectors
+		{
+			inDCs: []*api.Daemon{
+				{
+					ObjectMeta: api.ObjectMeta{Name: "basic", Namespace: "ns"},
+				},
+			},
+			list: func() ([]api.Daemon, error) {
+				pod := &api.Pod{
+					ObjectMeta: api.ObjectMeta{
+						Name:      "pod1",
+						Namespace: "ns",
+						Labels:    map[string]string{"foo": "bar"},
+					},
+				}
+				return lister.GetPodDaemons(pod)
+			},
+			outDCNames: util.NewStringSet(),
+			expectErr:  true,
+		},
+		// Matching labels to selectors and namespace
+		{
+			inDCs: []*api.Daemon{
+				{
+					ObjectMeta: api.ObjectMeta{Name: "foo"},
+					Spec: api.DaemonSpec{
+						Selector: map[string]string{"foo": "bar"},
+					},
+				},
+				{
+					ObjectMeta: api.ObjectMeta{Name: "bar", Namespace: "ns"},
+					Spec: api.DaemonSpec{
+						Selector: map[string]string{"foo": "bar"},
+					},
+				},
+			},
+			list: func() ([]api.Daemon, error) {
+				pod := &api.Pod{
+					ObjectMeta: api.ObjectMeta{
+						Name:      "pod1",
+						Labels:    map[string]string{"foo": "bar"},
+						Namespace: "ns",
+					},
+				}
+				return lister.GetPodDaemons(pod)
+			},
+			outDCNames: util.NewStringSet("bar"),
+		},
+	}
+	for _, c := range testCases {
+		for _, r := range c.inDCs {
+			store.Add(r)
+		}
+
+		gotControllers, err := c.list()
+		if err != nil && c.expectErr {
+			continue
+		} else if c.expectErr {
+			t.Fatalf("Expected error, got none")
+		} else if err != nil {
+			t.Fatalf("Unexpected error %#v", err)
+		}
+		gotNames := make([]string, len(gotControllers))
+		for ix := range gotControllers {
+			gotNames[ix] = gotControllers[ix].Name
+		}
+		if !c.outDCNames.HasAll(gotNames...) || len(gotNames) != len(c.outDCNames) {
+			t.Errorf("Unexpected got controllers %+v expected %+v", gotNames, c.outDCNames)
+		}
+	}
+}
+
 func TestStoreToPodLister(t *testing.T) {
 	store := NewStore(MetaNamespaceKeyFunc)
 	ids := []string{"foo", "bar", "baz"}

pkg/client/unversioned/client.go

@@ -33,6 +33,7 @@ type Interface interface {
 	PodsNamespacer
 	PodTemplatesNamespacer
 	ReplicationControllersNamespacer
+	DaemonsNamespacer
 	ServicesNamespacer
 	EndpointsNamespacer
 	VersionInterface
@@ -52,6 +53,10 @@ func (c *Client) ReplicationControllers(namespace string) ReplicationControllerI
 	return newReplicationControllers(c, namespace)
 }
 
+func (c *Client) Daemons(namespace string) DaemonInterface {
+	return newDaemons(c, namespace)
+}
+
 func (c *Client) Nodes() NodeInterface {
 	return newNodes(c)
 }

pkg/client/unversioned/daemon.go

+/*
+Copyright 2015 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/fields"
+	"k8s.io/kubernetes/pkg/labels"
+	"k8s.io/kubernetes/pkg/watch"
+)
+
+// DaemonsNamespacer has methods to work with Daemon resources in a namespace
+type DaemonsNamespacer interface {
+	Daemons(namespace string) DaemonInterface
+}
+
+type DaemonInterface interface {
+	List(selector labels.Selector) (*api.DaemonList, error)
+	Get(name string) (*api.Daemon, error)
+	Create(ctrl *api.Daemon) (*api.Daemon, error)
+	Update(ctrl *api.Daemon) (*api.Daemon, error)
+	Delete(name string) error
+	Watch(label labels.Selector, field fields.Selector, resourceVersion string) (watch.Interface, error)
+}
+
+// daemons implements DaemonsNamespacer interface
+type daemons struct {
+	r  *Client
+	ns string
+}
+
+func newDaemons(c *Client, namespace string) *daemons {
+	return &daemons{c, namespace}
+}
+
+// Ensure statically that daemons implements DaemonInterface.
+var _ DaemonInterface = &daemons{}
+
+func (c *daemons) List(selector labels.Selector) (result *api.DaemonList, err error) {
+	result = &api.DaemonList{}
+	err = c.r.Get().Namespace(c.ns).Resource("daemons").LabelsSelectorParam(selector).Do().Into(result)
+	return
+}
+
+// Get returns information about a particular daemon.
+func (c *daemons) Get(name string) (result *api.Daemon, err error) {
+	result = &api.Daemon{}
+	err = c.r.Get().Namespace(c.ns).Resource("daemons").Name(name).Do().Into(result)
+	return
+}
+
+// Create creates a new daemon.
+func (c *daemons) Create(daemon *api.Daemon) (result *api.Daemon, err error) {
+	result = &api.Daemon{}
+	err = c.r.Post().Namespace(c.ns).Resource("daemons").Body(daemon).Do().Into(result)
+	return
+}
+
+// Update updates an existing daemon.
+func (c *daemons) Update(daemon *api.Daemon) (result *api.Daemon, err error) {
+	result = &api.Daemon{}
+	err = c.r.Put().Namespace(c.ns).Resource("daemons").Name(daemon.Name).Body(daemon).Do().Into(result)
+	return
+}
+
+// Delete deletes an existing daemon.
+func (c *daemons) Delete(name string) error {
+	return c.r.Delete().Namespace(c.ns).Resource("daemons").Name(name).Do().Error()
+}
+
+// Watch returns a watch.Interface that watches the requested daemons.
+func (c *daemons) Watch(label labels.Selector, field fields.Selector, resourceVersion string) (watch.Interface, error) {
+	return c.r.Get().
+		Prefix("watch").
+		Namespace(c.ns).
+		Resource("daemons").
+		Param("resourceVersion", resourceVersion).
+		LabelsSelectorParam(label).
+		FieldsSelectorParam(field).
+		Watch()
+}

pkg/client/unversioned/daemon_test.go

+/*
+Copyright 2015 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 (
+	"testing"
+
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/api/testapi"
+	"k8s.io/kubernetes/pkg/labels"
+)
+
+func getDCResourceName() string {
+	return "daemons"
+}
+
+func TestListDaemons(t *testing.T) {
+	ns := api.NamespaceAll
+	c := &testClient{
+		Request: testRequest{
+			Method: "GET",
+			Path:   testapi.ResourcePath(getDCResourceName(), ns, ""),
+		},
+		Response: Response{StatusCode: 200,
+			Body: &api.DaemonList{
+				Items: []api.Daemon{
+					{
+						ObjectMeta: api.ObjectMeta{
+							Name: "foo",
+							Labels: map[string]string{
+								"foo":  "bar",
+								"name": "baz",
+							},
+						},
+						Spec: api.DaemonSpec{
+							Template: &api.PodTemplateSpec{},
+						},
+					},
+				},
+			},
+		},
+	}
+	receivedControllerList, err := c.Setup().Daemons(ns).List(labels.Everything())
+	c.Validate(t, receivedControllerList, err)
+
+}
+
+func TestGetDaemon(t *testing.T) {
+	ns := api.NamespaceDefault
+	c := &testClient{
+		Request: testRequest{Method: "GET", Path: testapi.ResourcePath(getDCResourceName(), ns, "foo"), Query: buildQueryValues(nil)},
+		Response: Response{
+			StatusCode: 200,
+			Body: &api.Daemon{
+				ObjectMeta: api.ObjectMeta{
+					Name: "foo",
+					Labels: map[string]string{
+						"foo":  "bar",
+						"name": "baz",
+					},
+				},
+				Spec: api.DaemonSpec{
+					Template: &api.PodTemplateSpec{},
+				},
+			},
+		},
+	}
+	receivedController, err := c.Setup().Daemons(ns).Get("foo")
+	c.Validate(t, receivedController, err)
+}
+
+func TestGetDaemonWithNoName(t *testing.T) {
+	ns := api.NamespaceDefault
+	c := &testClient{Error: true}
+	receivedPod, err := c.Setup().Daemons(ns).Get("")
+	if (err != nil) && (err.Error() != nameRequiredError) {
+		t.Errorf("Expected error: %v, but got %v", nameRequiredError, err)
+	}
+
+	c.Validate(t, receivedPod, err)
+}
+
+func TestUpdateDaemon(t *testing.T) {
+	ns := api.NamespaceDefault
+	requestController := &api.Daemon{
+		ObjectMeta: api.ObjectMeta{Name: "foo", ResourceVersion: "1"},
+	}
+	c := &testClient{
+		Request: testRequest{Method: "PUT", Path: testapi.ResourcePath(getDCResourceName(), ns, "foo"), Query: buildQueryValues(nil)},
+		Response: Response{
+			StatusCode: 200,
+			Body: &api.Daemon{
+				ObjectMeta: api.ObjectMeta{
+					Name: "foo",
+					Labels: map[string]string{
+						"foo":  "bar",
+						"name": "baz",
+					},
+				},
+				Spec: api.DaemonSpec{
+					Template: &api.PodTemplateSpec{},
+				},
+			},
+		},
+	}
+	receivedController, err := c.Setup().Daemons(ns).Update(requestController)
+	c.Validate(t, receivedController, err)
+}
+
+func TestDeleteDaemon(t *testing.T) {
+	ns := api.NamespaceDefault
+	c := &testClient{
+		Request:  testRequest{Method: "DELETE", Path: testapi.ResourcePath(getDCResourceName(), ns, "foo"), Query: buildQueryValues(nil)},
+		Response: Response{StatusCode: 200},
+	}
+	err := c.Setup().Daemons(ns).Delete("foo")
+	c.Validate(t, nil, err)
+}
+
+func TestCreateDaemon(t *testing.T) {
+	ns := api.NamespaceDefault
+	requestController := &api.Daemon{
+		ObjectMeta: api.ObjectMeta{Name: "foo"},
+	}
+	c := &testClient{
+		Request: testRequest{Method: "POST", Path: testapi.ResourcePath(getDCResourceName(), ns, ""), Body: requestController, Query: buildQueryValues(nil)},
+		Response: Response{
+			StatusCode: 200,
+			Body: &api.Daemon{
+				ObjectMeta: api.ObjectMeta{
+					Name: "foo",
+					Labels: map[string]string{
+						"foo":  "bar",
+						"name": "baz",
+					},
+				},
+				Spec: api.DaemonSpec{
+					Template: &api.PodTemplateSpec{},
+				},
+			},
+		},
+	}
+	receivedController, err := c.Setup().Daemons(ns).Create(requestController)
+	c.Validate(t, receivedController, err)
+}

pkg/client/unversioned/doc.go

@@ -17,7 +17,7 @@ limitations under the License.
 /*
 Package client contains the implementation of the client side communication with the
 Kubernetes master. The Client class provides methods for reading, creating, updating,
-and deleting pods, replication controllers, services, and minions.
+and deleting pods, replication controllers, daemons, services, and minions.
 
 Most consumers should use the Config object to create a Client:
 

pkg/client/unversioned/helper.go

@@ -127,7 +127,7 @@ type TLSClientConfig struct {
 }
 
 // New creates a Kubernetes client for the given config. This client works with pods,
-// replication controllers and services. It allows operations such as list, get, update
+// replication controllers, daemons, and services. It allows operations such as list, get, update
 // and delete on these objects. An error is returned if the provided configuration
 // is not valid.
 func New(c *Config) (*Client, error) {

pkg/client/unversioned/resource_quotas_test.go

@@ -45,6 +45,7 @@ func TestResourceQuotaCreate(t *testing.T) {
 				api.ResourcePods:                   resource.MustParse("10"),
 				api.ResourceServices:               resource.MustParse("10"),
 				api.ResourceReplicationControllers: resource.MustParse("10"),
+				api.ResourceDaemon:                 resource.MustParse("10"),
 				api.ResourceQuotas:                 resource.MustParse("10"),
 			},
 		},
@@ -77,6 +78,7 @@ func TestResourceQuotaGet(t *testing.T) {
 				api.ResourcePods:                   resource.MustParse("10"),
 				api.ResourceServices:               resource.MustParse("10"),
 				api.ResourceReplicationControllers: resource.MustParse("10"),
+				api.ResourceDaemon:                 resource.MustParse("10"),
 				api.ResourceQuotas:                 resource.MustParse("10"),
 			},
 		},
@@ -133,6 +135,7 @@ func TestResourceQuotaUpdate(t *testing.T) {
 				api.ResourcePods:                   resource.MustParse("10"),
 				api.ResourceServices:               resource.MustParse("10"),
 				api.ResourceReplicationControllers: resource.MustParse("10"),
+				api.ResourceDaemon:                 resource.MustParse("10"),
 				api.ResourceQuotas:                 resource.MustParse("10"),
 			},
 		},
@@ -160,6 +163,7 @@ func TestResourceQuotaStatusUpdate(t *testing.T) {
 				api.ResourcePods:                   resource.MustParse("10"),
 				api.ResourceServices:               resource.MustParse("10"),
 				api.ResourceReplicationControllers: resource.MustParse("10"),
+				api.ResourceDaemon:                 resource.MustParse("10"),
 				api.ResourceQuotas:                 resource.MustParse("10"),
 			},
 		},

pkg/client/unversioned/testclient/fake_daemons.go

+/*
+Copyright 2015 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 testclient
+
+import (
+	"k8s.io/kubernetes/pkg/api"
+	kClientLib "k8s.io/kubernetes/pkg/client/unversioned"
+	"k8s.io/kubernetes/pkg/fields"
+	"k8s.io/kubernetes/pkg/labels"
+	"k8s.io/kubernetes/pkg/watch"
+)
+
+// FakeDaemons implements DaemonInterface. Meant to be embedded into a struct to get a default
+// implementation. This makes faking out just the method you want to test easier.
+type FakeDaemons struct {
+	Fake      *Fake
+	Namespace string
+}
+
+const (
+	GetDaemonAction    = "get-daemon"
+	UpdateDaemonAction = "update-daemon"
+	WatchDaemonAction  = "watch-daemon"
+	DeleteDaemonAction = "delete-daemon"
+	ListDaemonAction   = "list-daemons"
+	CreateDaemonAction = "create-daemon"
+)
+
+// Ensure statically that FakeDaemons implements DaemonInterface.
+var _ kClientLib.DaemonInterface = &FakeDaemons{}
+
+func (c *FakeDaemons) Get(name string) (*api.Daemon, error) {
+	obj, err := c.Fake.Invokes(NewGetAction("daemons", c.Namespace, name), &api.Daemon{})
+	return obj.(*api.Daemon), err
+}
+
+func (c *FakeDaemons) List(label labels.Selector) (*api.DaemonList, error) {
+	obj, err := c.Fake.Invokes(NewListAction("daemons", c.Namespace, label, nil), &api.DaemonList{})
+	return obj.(*api.DaemonList), err
+}
+
+func (c *FakeDaemons) Create(daemon *api.Daemon) (*api.Daemon, error) {
+	obj, err := c.Fake.Invokes(NewCreateAction("daemons", c.Namespace, daemon), &api.Daemon{})
+	return obj.(*api.Daemon), err
+}
+
+func (c *FakeDaemons) Update(daemon *api.Daemon) (*api.Daemon, error) {
+	obj, err := c.Fake.Invokes(NewUpdateAction("daemons", c.Namespace, daemon), &api.Daemon{})
+	return obj.(*api.Daemon), err
+}
+
+func (c *FakeDaemons) Delete(name string) error {
+	_, err := c.Fake.Invokes(NewDeleteAction("daemons", c.Namespace, name), &api.Daemon{})
+	return err
+}
+
+func (c *FakeDaemons) Watch(label labels.Selector, field fields.Selector, resourceVersion string) (watch.Interface, error) {
+	c.Fake.Invokes(NewWatchAction("daemons", c.Namespace, label, field, resourceVersion), nil)
+	return c.Fake.Watch, nil
+}

pkg/client/unversioned/testclient/testclient.go

@@ -114,6 +114,10 @@ func (c *Fake) ReplicationControllers(namespace string) client.ReplicationContro
 	return &FakeReplicationControllers{Fake: c, Namespace: namespace}
 }
 
+func (c *Fake) Daemons(namespace string) client.DaemonInterface {
+	return &FakeDaemons{Fake: c, Namespace: namespace}
+}
+
 func (c *Fake) Nodes() client.NodeInterface {
 	return &FakeNodes{Fake: c}
 }

pkg/registry/daemon/doc.go

+/*
+Copyright 2015 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 daemon provides Registry interface and its RESTStorage
+// implementation for storing Daemon api objects.
+package daemon

pkg/registry/daemon/etcd/etcd.go

+/*
+Copyright 2015 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 etcd
+
+import (
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/fields"
+	"k8s.io/kubernetes/pkg/labels"
+	"k8s.io/kubernetes/pkg/registry/daemon"
+	"k8s.io/kubernetes/pkg/registry/generic"
+	etcdgeneric "k8s.io/kubernetes/pkg/registry/generic/etcd"
+	"k8s.io/kubernetes/pkg/runtime"
+	"k8s.io/kubernetes/pkg/storage"
+)
+
+// rest implements a RESTStorage for daemons against etcd
+type REST struct {
+	*etcdgeneric.Etcd
+}
+
+// daemonPrefix is the location for daemons in etcd, only exposed
+// for testing
+var daemonPrefix = "/daemons"
+
+// NewREST returns a RESTStorage object that will work against daemons.
+func NewREST(s storage.Interface) *REST {
+	store := &etcdgeneric.Etcd{
+		NewFunc: func() runtime.Object { return &api.Daemon{} },
+
+		// NewListFunc returns an object capable of storing results of an etcd list.
+		NewListFunc: func() runtime.Object { return &api.DaemonList{} },
+		// Produces a path that etcd understands, to the root of the resource
+		// by combining the namespace in the context with the given prefix
+		KeyRootFunc: func(ctx api.Context) string {
+			return etcdgeneric.NamespaceKeyRootFunc(ctx, daemonPrefix)
+		},
+		// Produces a path that etcd understands, to the resource by combining
+		// the namespace in the context with the given prefix
+		KeyFunc: func(ctx api.Context, name string) (string, error) {
+			return etcdgeneric.NamespaceKeyFunc(ctx, daemonPrefix, name)
+		},
+		// Retrieve the name field of a daemon
+		ObjectNameFunc: func(obj runtime.Object) (string, error) {
+			return obj.(*api.Daemon).Name, nil
+		},
+		// Used to match objects based on labels/fields for list and watch
+		PredicateFunc: func(label labels.Selector, field fields.Selector) generic.Matcher {
+			return daemon.MatchDaemon(label, field)
+		},
+		EndpointName: "daemons",
+
+		// Used to validate daemon creation
+		CreateStrategy: daemon.Strategy,
+
+		// Used to validate daemon updates
+		UpdateStrategy: daemon.Strategy,
+
+		Storage: s,
+	}
+
+	return &REST{store}
+}

pkg/registry/daemon/rest.go

+/*
+Copyright 2015 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 daemon
+
+import (
+	"fmt"
+	"reflect"
+
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/api/validation"
+	"k8s.io/kubernetes/pkg/fields"
+	"k8s.io/kubernetes/pkg/labels"
+	"k8s.io/kubernetes/pkg/registry/generic"
+	"k8s.io/kubernetes/pkg/runtime"
+	"k8s.io/kubernetes/pkg/util/fielderrors"
+)
+
+// daemonStrategy implements verification logic for daemons.
+type daemonStrategy struct {
+	runtime.ObjectTyper
+	api.NameGenerator
+}
+
+// Strategy is the default logic that applies when creating and updating Daemon objects.
+var Strategy = daemonStrategy{api.Scheme, api.SimpleNameGenerator}
+
+// NamespaceScoped returns true because all Daemons need to be within a namespace.
+func (daemonStrategy) NamespaceScoped() bool {
+	return true
+}
+
+// PrepareForCreate clears the status of a daemon before creation.
+func (daemonStrategy) PrepareForCreate(obj runtime.Object) {
+	daemon := obj.(*api.Daemon)
+	daemon.Status = api.DaemonStatus{}
+
+	daemon.Generation = 1
+}
+
+// PrepareForUpdate clears fields that are not allowed to be set by end users on update.
+func (daemonStrategy) PrepareForUpdate(obj, old runtime.Object) {
+	newDaemon := obj.(*api.Daemon)
+	oldDaemon := old.(*api.Daemon)
+
+	// Any changes to the spec increment the generation number, any changes to the
+	// status should reflect the generation number of the corresponding object. We push
+	// the burden of managing the status onto the clients because we can't (in general)
+	// know here what version of spec the writer of the status has seen. It may seem like
+	// we can at first -- since obj contains spec -- but in the future we will probably make
+	// status its own object, and even if we don't, writes may be the result of a
+	// read-update-write loop, so the contents of spec may not actually be the spec that
+	// the controller has *seen*.
+	//
+	// TODO: Any changes to a part of the object that represents desired state (labels,
+	// annotations etc) should also increment the generation.
+	if !reflect.DeepEqual(oldDaemon.Spec, newDaemon.Spec) {
+		newDaemon.Generation = oldDaemon.Generation + 1
+	}
+}
+
+// Validate validates a new daemon.
+func (daemonStrategy) Validate(ctx api.Context, obj runtime.Object) fielderrors.ValidationErrorList {
+	daemon := obj.(*api.Daemon)
+	return validation.ValidateDaemon(daemon)
+}
+
+// AllowCreateOnUpdate is false for daemon; this means a POST is
+// needed to create one
+func (daemonStrategy) AllowCreateOnUpdate() bool {
+	return false
+}
+
+// ValidateUpdate is the default update validation for an end user.
+func (daemonStrategy) ValidateUpdate(ctx api.Context, obj, old runtime.Object) fielderrors.ValidationErrorList {
+	validationErrorList := validation.ValidateDaemon(obj.(*api.Daemon))
+	updateErrorList := validation.ValidateDaemonUpdate(old.(*api.Daemon), obj.(*api.Daemon))
+	return append(validationErrorList, updateErrorList...)
+}
+
+// AllowUnconditionalUpdate is the default update policy for daemon objects.
+func (daemonStrategy) AllowUnconditionalUpdate() bool {
+	return true
+}
+
+// DaemonToSelectableFields returns a field set that represents the object.
+func DaemonToSelectableFields(daemon *api.Daemon) fields.Set {
+	return fields.Set{
+		"metadata.name": daemon.Name,
+	}
+}
+
+// MatchDaemon is the filter used by the generic etcd backend to route
+// watch events from etcd to clients of the apiserver only interested in specific
+// labels/fields.
+func MatchDaemon(label labels.Selector, field fields.Selector) generic.Matcher {
+	return &generic.SelectionPredicate{
+		Label: label,
+		Field: field,
+		GetAttrs: func(obj runtime.Object) (labels.Set, fields.Set, error) {
+			daemon, ok := obj.(*api.Daemon)
+			if !ok {
+				return nil, nil, fmt.Errorf("given object is not a daemon.")
+			}
+			return labels.Set(daemon.ObjectMeta.Labels), DaemonToSelectableFields(daemon), nil
+		},
+	}
+}