Event impl supporting changes

pkg/registry/etcd/etcd.go

@@ -119,7 +119,7 @@ func (r *Registry) CreatePod(pod *api.Pod) error {
 	// DesiredState.Host == "" is a signal to the scheduler that this pod needs scheduling.
 	pod.DesiredState.Status = api.PodRunning
 	pod.DesiredState.Host = ""
-	err := r.CreateObj(makePodKey(pod.ID), pod)
+	err := r.CreateObj(makePodKey(pod.ID), pod, 0)
 	return etcderr.InterpretCreateError(err, "pod", pod.ID)
 }
 
@@ -253,7 +253,7 @@ func (r *Registry) GetController(controllerID string) (*api.ReplicationControlle
 
 // CreateController creates a new ReplicationController.
 func (r *Registry) CreateController(controller *api.ReplicationController) error {
-	err := r.CreateObj(makeControllerKey(controller.ID), controller)
+	err := r.CreateObj(makeControllerKey(controller.ID), controller, 0)
 	return etcderr.InterpretCreateError(err, "replicationController", controller.ID)
 }
 
@@ -283,7 +283,7 @@ func (r *Registry) ListServices() (*api.ServiceList, error) {
 
 // CreateService creates a new Service.
 func (r *Registry) CreateService(svc *api.Service) error {
-	err := r.CreateObj(makeServiceKey(svc.ID), svc)
+	err := r.CreateObj(makeServiceKey(svc.ID), svc, 0)
 	return etcderr.InterpretCreateError(err, "service", svc.ID)
 }
 

pkg/runtime/helper.go

@@ -0,0 +1,91 @@
+/*
+Copyright 2014 Google Inc. 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 runtime
+
+import (
+	"fmt"
+	"reflect"
+)
+
+// GetItemsPtr returns a pointer to the list object's Items member.
+// If 'list' doesn't have an Items member, it's not really a list type
+// and an error will be returned.
+// This function will either return a pointer to a slice, or an error, but not both.
+func GetItemsPtr(list Object) (interface{}, error) {
+	v := reflect.ValueOf(list)
+	if !v.IsValid() {
+		return nil, fmt.Errorf("nil list object")
+	}
+	items := v.Elem().FieldByName("Items")
+	if !items.IsValid() {
+		return nil, fmt.Errorf("no Items field in %#v", list)
+	}
+	if items.Kind() != reflect.Slice {
+		return nil, fmt.Errorf("Items field is not a slice")
+	}
+	return items.Addr().Interface(), nil
+}
+
+// ExtractList returns obj's Items element as an array of runtime.Objects.
+// Returns an error if obj is not a List type (does not have an Items member).
+func ExtractList(obj Object) ([]Object, error) {
+	itemsPtr, err := GetItemsPtr(obj)
+	if err != nil {
+		return nil, err
+	}
+	items := reflect.ValueOf(itemsPtr).Elem()
+	list := make([]Object, items.Len())
+	for i := range list {
+		raw := items.Index(i)
+		item, ok := raw.Addr().Interface().(Object)
+		if !ok {
+			return nil, fmt.Errorf("item in index %v isn't an object: %#v", i, raw.Interface())
+		}
+		list[i] = item
+	}
+	return list, nil
+}
+
+// SetList sets the given list object's Items member have the elements given in
+// objects.
+// Returns an error if list is not a List type (does not have an Items member),
+// or if any of the objects are not of the right type.
+func SetList(list Object, objects []Object) error {
+	itemsPtr, err := GetItemsPtr(list)
+	if err != nil {
+		return err
+	}
+	items := reflect.ValueOf(itemsPtr).Elem()
+	slice := reflect.MakeSlice(items.Type(), len(objects), len(objects))
+	for i := range objects {
+		dest := slice.Index(i)
+		src := reflect.ValueOf(objects[i])
+		if !src.IsValid() || src.IsNil() {
+			return fmt.Errorf("an object was nil")
+		}
+		src = src.Elem() // Object is a pointer, but the items in slice are not.
+		if src.Type().AssignableTo(dest.Type()) {
+			dest.Set(src)
+		} else if src.Type().ConvertibleTo(dest.Type()) {
+			dest.Set(src.Convert(dest.Type()))
+		} else {
+			return fmt.Errorf("wrong type: need %v, got %v", dest.Type(), src.Type())
+		}
+	}
+	items.Set(slice)
+	return nil
+}

pkg/runtime/helper_test.go

@@ -0,0 +1,93 @@
+/*
+Copyright 2014 Google Inc. 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 runtime_test
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
+
+	"github.com/google/gofuzz"
+)
+
+func TestExtractList(t *testing.T) {
+	pl := &api.PodList{
+		Items: []api.Pod{
+			{JSONBase: api.JSONBase{ID: "1"}},
+			{JSONBase: api.JSONBase{ID: "2"}},
+			{JSONBase: api.JSONBase{ID: "3"}},
+		},
+	}
+	list, err := runtime.ExtractList(pl)
+	if err != nil {
+		t.Fatalf("Unexpected error %v", err)
+	}
+	if e, a := len(list), len(pl.Items); e != a {
+		t.Fatalf("Expected %v, got %v", e, a)
+	}
+	for i := range list {
+		if e, a := list[i].(*api.Pod).ID, pl.Items[i].ID; e != a {
+			t.Fatalf("Expected %v, got %v", e, a)
+		}
+	}
+}
+
+func TestSetList(t *testing.T) {
+	pl := &api.PodList{}
+	list := []runtime.Object{
+		&api.Pod{JSONBase: api.JSONBase{ID: "1"}},
+		&api.Pod{JSONBase: api.JSONBase{ID: "2"}},
+		&api.Pod{JSONBase: api.JSONBase{ID: "3"}},
+	}
+	err := runtime.SetList(pl, list)
+	if err != nil {
+		t.Fatalf("Unexpected error %v", err)
+	}
+	if e, a := len(list), len(pl.Items); e != a {
+		t.Fatalf("Expected %v, got %v", e, a)
+	}
+	for i := range list {
+		if e, a := list[i].(*api.Pod).ID, pl.Items[i].ID; e != a {
+			t.Fatalf("Expected %v, got %v", e, a)
+		}
+	}
+}
+
+func TestSetExtractListRoundTrip(t *testing.T) {
+	fuzzer := fuzz.New().NilChance(0).NumElements(1, 5)
+	for i := 0; i < 5; i++ {
+		start := &api.PodList{}
+		fuzzer.Fuzz(&start.Items)
+
+		list, err := runtime.ExtractList(start)
+		if err != nil {
+			t.Errorf("Unexpected error %v", err)
+			continue
+		}
+		got := &api.PodList{}
+		err = runtime.SetList(got, list)
+		if err != nil {
+			t.Errorf("Unexpected error %v", err)
+			continue
+		}
+		if e, a := start, got; !reflect.DeepEqual(e, a) {
+			t.Fatalf("Expected %#v, got %#v", e, a)
+		}
+	}
+}

pkg/runtime/scheme.go

@@ -400,28 +400,3 @@ func (metaInsertion) Interpret(in interface{}) (version, kind string) {
 	m := in.(*metaInsertion)
 	return m.JSONBase.APIVersion, m.JSONBase.Kind
 }
-
-// Extract list returns obj's Items element as an array of runtime.Objects.
-// Returns an error if obj is not a List type (does not have an Items member).
-func ExtractList(obj Object) ([]Object, error) {
-	v := reflect.ValueOf(obj)
-	if !v.IsValid() {
-		return nil, fmt.Errorf("nil object")
-	}
-	items := v.Elem().FieldByName("Items")
-	if !items.IsValid() {
-		return nil, fmt.Errorf("no Items field")
-	}
-	if items.Kind() != reflect.Slice {
-		return nil, fmt.Errorf("Items field is not a slice")
-	}
-	list := make([]Object, items.Len())
-	for i := range list {
-		item, ok := items.Index(i).Addr().Interface().(Object)
-		if !ok {
-			return nil, fmt.Errorf("item in index %v isn't an object", i)
-		}
-		list[i] = item
-	}
-	return list, nil
-}

pkg/tools/etcd_tools.go

@@ -123,6 +123,7 @@ func (h *EtcdHelper) listEtcdNode(key string) ([]*etcd.Node, uint64, error) {
 }
 
 // ExtractList extracts a go object per etcd node into a slice with the resource version.
+// DEPRECATED: Use ExtractToList instead, it's more convenient.
 func (h *EtcdHelper) ExtractList(key string, slicePtr interface{}, resourceVersion *uint64) error {
 	nodes, index, err := h.listEtcdNode(key)
 	if resourceVersion != nil {
@@ -152,6 +153,27 @@ func (h *EtcdHelper) ExtractList(key string, slicePtr interface{}, resourceVersi
 	return nil
 }
 
+// ExtractToList is just like ExtractList, but it works on a ThingyList api object.
+// extracts a go object per etcd node into a slice with the resource version.
+func (h *EtcdHelper) ExtractToList(key string, listObj runtime.Object) error {
+	var resourceVersion uint64
+	listPtr, err := runtime.GetItemsPtr(listObj)
+	if err != nil {
+		return err
+	}
+	err = h.ExtractList(key, listPtr, &resourceVersion)
+	if err != nil {
+		return err
+	}
+	if h.ResourceVersioner != nil {
+		err = h.ResourceVersioner.SetResourceVersion(listObj, resourceVersion)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 // ExtractObj unmarshals json found at key into objPtr. On a not found error, will either return
 // a zero object of the requested type, or an error, depending on ignoreNotFound. Treats
 // empty responses and nil response nodes exactly like a not found error.
@@ -185,8 +207,9 @@ func (h *EtcdHelper) bodyAndExtractObj(key string, objPtr runtime.Object, ignore
 	return body, response.Node.ModifiedIndex, err
 }
 
-// CreateObj adds a new object at a key unless it already exists.
-func (h *EtcdHelper) CreateObj(key string, obj runtime.Object) error {
+// CreateObj adds a new object at a key unless it already exists. 'ttl' is time-to-live in seconds,
+// and 0 means forever.
+func (h *EtcdHelper) CreateObj(key string, obj runtime.Object, ttl uint64) error {
 	data, err := h.Codec.Encode(obj)
 	if err != nil {
 		return err
@@ -197,7 +220,7 @@ func (h *EtcdHelper) CreateObj(key string, obj runtime.Object) error {
 		}
 	}
 
-	_, err = h.Client.Create(key, string(data), 0)
+	_, err = h.Client.Create(key, string(data), ttl)
 	return err
 }
 

pkg/tools/etcd_tools_test.go

@@ -65,7 +65,7 @@ func TestIsEtcdNotFound(t *testing.T) {
 	try(fmt.Errorf("some other kind of error"), false)
 }
 
-func TestExtractList(t *testing.T) {
+func TestExtractToList(t *testing.T) {
 	fakeClient := NewFakeEtcdClient(t)
 	fakeClient.Data["/some/key"] = EtcdResponseWithError{
 		R: &etcd.Response{
@@ -88,27 +88,23 @@ func TestExtractList(t *testing.T) {
 			},
 		},
 	}
-	expect := []api.Pod{
-		{JSONBase: api.JSONBase{ID: "foo", ResourceVersion: 1}},
-		{JSONBase: api.JSONBase{ID: "bar", ResourceVersion: 2}},
-		{JSONBase: api.JSONBase{ID: "baz", ResourceVersion: 3}},
+	expect := api.PodList{
+		JSONBase: api.JSONBase{ResourceVersion: 10},
+		Items: []api.Pod{
+			{JSONBase: api.JSONBase{ID: "foo", ResourceVersion: 1}},
+			{JSONBase: api.JSONBase{ID: "bar", ResourceVersion: 2}},
+			{JSONBase: api.JSONBase{ID: "baz", ResourceVersion: 3}},
+		},
 	}
 
-	var got []api.Pod
+	var got api.PodList
 	helper := EtcdHelper{fakeClient, latest.Codec, versioner}
-	resourceVersion := uint64(0)
-	err := helper.ExtractList("/some/key", &got, &resourceVersion)
+	err := helper.ExtractToList("/some/key", &got)
 	if err != nil {
-		t.Errorf("Unexpected error %#v", err)
-	}
-	if resourceVersion != 10 {
-		t.Errorf("Unexpected resource version %d", resourceVersion)
+		t.Errorf("Unexpected error %v", err)
 	}
-
-	for i := 0; i < len(expect); i++ {
-		if !reflect.DeepEqual(got[i], expect[i]) {
-			t.Errorf("\nWanted:\n%#v\nGot:\n%#v\n", expect[i], got[i])
-		}
+	if e, a := expect, got; !reflect.DeepEqual(e, a) {
+		t.Errorf("Expected %#v, got %#v", e, a)
 	}
 }
 
@@ -167,6 +163,27 @@ func TestExtractObjNotFoundErr(t *testing.T) {
 	try("/some/key3")
 }
 
+func TestCreateObj(t *testing.T) {
+	obj := &api.Pod{JSONBase: api.JSONBase{ID: "foo"}}
+	fakeClient := NewFakeEtcdClient(t)
+	helper := EtcdHelper{fakeClient, latest.Codec, versioner}
+	err := helper.CreateObj("/some/key", obj, 5)
+	if err != nil {
+		t.Errorf("Unexpected error %#v", err)
+	}
+	data, err := latest.Codec.Encode(obj)
+	if err != nil {
+		t.Errorf("Unexpected error %#v", err)
+	}
+	node := fakeClient.Data["/some/key"].R.Node
+	if e, a := string(data), node.Value; e != a {
+		t.Errorf("Wanted %v, got %v", e, a)
+	}
+	if e, a := uint64(5), fakeClient.LastSetTTL; e != a {
+		t.Errorf("Wanted %v, got %v", e, a)
+	}
+}
+
 func TestSetObj(t *testing.T) {
 	obj := &api.Pod{JSONBase: api.JSONBase{ID: "foo"}}
 	fakeClient := NewFakeEtcdClient(t)

pkg/tools/fake_etcd_client.go

@@ -49,6 +49,7 @@ type FakeEtcdClient struct {
 	Ix          int
 	TestIndex   bool
 	ChangeIndex uint64
+	LastSetTTL  uint64
 
 	// Will become valid after Watch is called; tester may write to it. Tester may
 	// also read from it to verify that it's closed after injecting an error.
@@ -135,6 +136,7 @@ func (f *FakeEtcdClient) nodeExists(key string) bool {
 }
 
 func (f *FakeEtcdClient) setLocked(key, value string, ttl uint64) (*etcd.Response, error) {
+	f.LastSetTTL = ttl
 	if f.Err != nil {
 		return nil, f.Err
 	}