Refactor code for creating Cacher.

pkg/master/master.go

@@ -535,8 +535,14 @@ func (m *Master) init(c *Config) {
 
 	healthzChecks := []healthz.HealthzChecker{}
 
+	var storageFactory storage.StorageFactory
+	if c.EnableWatchCache {
+		storageFactory = storage.NewCacher
+	} else {
+		storageFactory = storage.NoDecoration
+	}
 	dbClient := func(resource string) storage.Interface { return c.StorageDestinations.get("", resource) }
-	podStorage := podetcd.NewStorage(dbClient("pods"), c.EnableWatchCache, c.KubeletClient, m.proxyTransport)
+	podStorage := podetcd.NewStorage(dbClient("pods"), storageFactory, c.KubeletClient, m.proxyTransport)
 
 	podTemplateStorage := podtemplateetcd.NewREST(dbClient("podTemplates"))
 
@@ -552,10 +558,10 @@ func (m *Master) init(c *Config) {
 	namespaceStorage, namespaceStatusStorage, namespaceFinalizeStorage := namespaceetcd.NewREST(dbClient("namespaces"))
 	m.namespaceRegistry = namespace.NewRegistry(namespaceStorage)
 
-	endpointsStorage := endpointsetcd.NewREST(dbClient("endpoints"), c.EnableWatchCache)
+	endpointsStorage := endpointsetcd.NewREST(dbClient("endpoints"), storageFactory)
 	m.endpointRegistry = endpoint.NewRegistry(endpointsStorage)
 
-	nodeStorage, nodeStatusStorage := nodeetcd.NewREST(dbClient("nodes"), c.EnableWatchCache, c.KubeletClient, m.proxyTransport)
+	nodeStorage, nodeStatusStorage := nodeetcd.NewREST(dbClient("nodes"), storageFactory, c.KubeletClient, m.proxyTransport)
 	m.nodeRegistry = node.NewRegistry(nodeStorage)
 
 	serviceStorage := serviceetcd.NewREST(dbClient("services"))

pkg/registry/endpoint/etcd/etcd.go

@@ -32,27 +32,16 @@ type REST struct {
 }
 
 // NewREST returns a RESTStorage object that will work against endpoints.
-func NewREST(s storage.Interface, useCacher bool) *REST {
+func NewREST(s storage.Interface, storageFactory storage.StorageFactory) *REST {
 	prefix := "/services/endpoints"
 
-	storageInterface := s
-	if useCacher {
-		config := storage.CacherConfig{
-			CacheCapacity:  1000,
-			Storage:        s,
-			Type:           &api.Endpoints{},
-			ResourcePrefix: prefix,
-			KeyFunc: func(obj runtime.Object) (string, error) {
-				return storage.NamespaceKeyFunc(prefix, obj)
-			},
-			NewListFunc: func() runtime.Object { return &api.EndpointsList{} },
-		}
-		storageInterface = storage.NewCacher(config)
-	}
+	newListFunc := func() runtime.Object { return &api.EndpointsList{} }
+	storageInterface := storageFactory(
+		s, 1000, nil, &api.Endpoints{}, prefix, true, newListFunc)
 
 	store := &etcdgeneric.Etcd{
 		NewFunc:     func() runtime.Object { return &api.Endpoints{} },
-		NewListFunc: func() runtime.Object { return &api.EndpointsList{} },
+		NewListFunc: newListFunc,
 		KeyRootFunc: func(ctx api.Context) string {
 			return etcdgeneric.NamespaceKeyRootFunc(ctx, prefix)
 		},

pkg/registry/endpoint/etcd/etcd_test.go

@@ -24,12 +24,13 @@ import (
 	"k8s.io/kubernetes/pkg/labels"
 	"k8s.io/kubernetes/pkg/registry/registrytest"
 	"k8s.io/kubernetes/pkg/runtime"
+	"k8s.io/kubernetes/pkg/storage"
 	"k8s.io/kubernetes/pkg/tools"
 )
 
 func newStorage(t *testing.T) (*REST, *tools.FakeEtcdClient) {
 	etcdStorage, fakeClient := registrytest.NewEtcdStorage(t, "")
-	return NewREST(etcdStorage, false), fakeClient
+	return NewREST(etcdStorage, storage.NoDecoration), fakeClient
 }
 
 func validNewEndpoints() *api.Endpoints {

pkg/registry/node/etcd/etcd.go

@@ -50,27 +50,16 @@ func (r *StatusREST) Update(ctx api.Context, obj runtime.Object) (runtime.Object
 }
 
 // NewREST returns a RESTStorage object that will work against nodes.
-func NewREST(s storage.Interface, useCacher bool, connection client.ConnectionInfoGetter, proxyTransport http.RoundTripper) (*REST, *StatusREST) {
+func NewREST(s storage.Interface, storageFactory storage.StorageFactory, connection client.ConnectionInfoGetter, proxyTransport http.RoundTripper) (*REST, *StatusREST) {
 	prefix := "/minions"
 
-	storageInterface := s
-	if useCacher {
-		config := storage.CacherConfig{
-			CacheCapacity:  1000,
-			Storage:        s,
-			Type:           &api.Node{},
-			ResourcePrefix: prefix,
-			KeyFunc: func(obj runtime.Object) (string, error) {
-				return storage.NoNamespaceKeyFunc(prefix, obj)
-			},
-			NewListFunc: func() runtime.Object { return &api.NodeList{} },
-		}
-		storageInterface = storage.NewCacher(config)
-	}
+	newListFunc := func() runtime.Object { return &api.NodeList{} }
+	storageInterface := storageFactory(
+		s, 1000, nil, &api.Node{}, prefix, false, newListFunc)
 
 	store := &etcdgeneric.Etcd{
 		NewFunc:     func() runtime.Object { return &api.Node{} },
-		NewListFunc: func() runtime.Object { return &api.NodeList{} },
+		NewListFunc: newListFunc,
 		KeyRootFunc: func(ctx api.Context) string {
 			return prefix
 		},

pkg/registry/node/etcd/etcd_test.go

@@ -26,6 +26,7 @@ import (
 	"k8s.io/kubernetes/pkg/labels"
 	"k8s.io/kubernetes/pkg/registry/registrytest"
 	"k8s.io/kubernetes/pkg/runtime"
+	"k8s.io/kubernetes/pkg/storage"
 	"k8s.io/kubernetes/pkg/tools"
 )
 
@@ -38,7 +39,7 @@ func (fakeConnectionInfoGetter) GetConnectionInfo(host string) (string, uint, ht
 
 func newStorage(t *testing.T) (*REST, *tools.FakeEtcdClient) {
 	etcdStorage, fakeClient := registrytest.NewEtcdStorage(t, "")
-	storage, _ := NewREST(etcdStorage, false, fakeConnectionInfoGetter{}, nil)
+	storage, _ := NewREST(etcdStorage, storage.NoDecoration, fakeConnectionInfoGetter{}, nil)
 	return storage, fakeClient
 }
 

pkg/registry/pod/etcd/etcd.go

@@ -60,27 +60,16 @@ type REST struct {
 }
 
 // NewStorage returns a RESTStorage object that will work against pods.
-func NewStorage(s storage.Interface, useCacher bool, k client.ConnectionInfoGetter, proxyTransport http.RoundTripper) PodStorage {
+func NewStorage(s storage.Interface, storageFactory storage.StorageFactory, k client.ConnectionInfoGetter, proxyTransport http.RoundTripper) PodStorage {
 	prefix := "/pods"
 
-	storageInterface := s
-	if useCacher {
-		config := storage.CacherConfig{
-			CacheCapacity:  1000,
-			Storage:        s,
-			Type:           &api.Pod{},
-			ResourcePrefix: prefix,
-			KeyFunc: func(obj runtime.Object) (string, error) {
-				return storage.NamespaceKeyFunc(prefix, obj)
-			},
-			NewListFunc: func() runtime.Object { return &api.PodList{} },
-		}
-		storageInterface = storage.NewCacher(config)
-	}
+	newListFunc := func() runtime.Object { return &api.PodList{} }
+	storageInterface := storageFactory(
+		s, 1000, nil, &api.Pod{}, prefix, true, newListFunc)
 
 	store := &etcdgeneric.Etcd{
 		NewFunc:     func() runtime.Object { return &api.Pod{} },
-		NewListFunc: func() runtime.Object { return &api.PodList{} },
+		NewListFunc: newListFunc,
 		KeyRootFunc: func(ctx api.Context) string {
 			return etcdgeneric.NamespaceKeyRootFunc(ctx, prefix)
 		},

pkg/registry/pod/etcd/etcd_test.go

@@ -31,6 +31,7 @@ import (
 	"k8s.io/kubernetes/pkg/registry/registrytest"
 	"k8s.io/kubernetes/pkg/runtime"
 	"k8s.io/kubernetes/pkg/securitycontext"
+	"k8s.io/kubernetes/pkg/storage"
 	"k8s.io/kubernetes/pkg/tools"
 	"k8s.io/kubernetes/pkg/tools/etcdtest"
 	"k8s.io/kubernetes/pkg/util"
@@ -38,7 +39,7 @@ import (
 
 func newStorage(t *testing.T) (*REST, *BindingREST, *StatusREST, *tools.FakeEtcdClient) {
 	etcdStorage, fakeClient := registrytest.NewEtcdStorage(t, "")
-	storage := NewStorage(etcdStorage, false, nil, nil)
+	storage := NewStorage(etcdStorage, storage.NoDecoration, nil, nil)
 	return storage.Pod, storage.Binding, storage.Status, fakeClient
 }
 

pkg/storage/cacher.go

@@ -111,10 +111,63 @@ type Cacher struct {
 	ListFromCache bool
 }
 
+// StorageFactory is a function signature for producing
+// a storage.Interface from given parameters.
+type StorageFactory func(
+	storage Interface,
+	capacity int,
+	versioner Versioner,
+	objectType runtime.Object,
+	resourcePrefix string,
+	namespaceScoped bool,
+	newListFunc func() runtime.Object) Interface
+
+func NoDecoration(
+	storage Interface,
+	capacity int,
+	versioner Versioner,
+	objectType runtime.Object,
+	resourcePrefix string,
+	namespaceScoped bool,
+	newListFunc func() runtime.Object) Interface {
+	return storage
+}
+
 // Create a new Cacher responsible from service WATCH and LIST requests from its
 // internal cache and updating its cache in the background based on the given
 // configuration.
-func NewCacher(config CacherConfig) *Cacher {
+func NewCacher(
+	storage Interface,
+	capacity int,
+	versioner Versioner,
+	objectType runtime.Object,
+	resourcePrefix string,
+	namespaceScoped bool,
+	newListFunc func() runtime.Object) Interface {
+	config := CacherConfig{
+		CacheCapacity:  capacity,
+		Storage:        storage,
+		Versioner:      versioner,
+		Type:           objectType,
+		ResourcePrefix: resourcePrefix,
+		NewListFunc:    newListFunc,
+	}
+	if namespaceScoped {
+		config.KeyFunc = func(obj runtime.Object) (string, error) {
+			return NamespaceKeyFunc(resourcePrefix, obj)
+		}
+	} else {
+		config.KeyFunc = func(obj runtime.Object) (string, error) {
+			return NoNamespaceKeyFunc(resourcePrefix, obj)
+		}
+	}
+	return NewCacherFromConfig(config)
+}
+
+// Create a new Cacher responsible from service WATCH and LIST requests from its
+// internal cache and updating its cache in the background based on the given
+// configuration.
+func NewCacherFromConfig(config CacherConfig) *Cacher {
 	watchCache := newWatchCache(config.CacheCapacity)
 	listerWatcher := newCacherListerWatcher(config.Storage, config.ResourcePrefix, config.NewListFunc)
 

pkg/storage/cacher_test.go

@@ -55,7 +55,7 @@ func newTestCacher(client tools.EtcdClient) *storage.Cacher {
 		NewListFunc:    func() runtime.Object { return &api.PodList{} },
 		StopChannel:    util.NeverStop,
 	}
-	return storage.NewCacher(config)
+	return storage.NewCacherFromConfig(config)
 }
 
 func makeTestPod(name string) *api.Pod {