Fix watch for events; add test for interface implementation so it won't break again.

pkg/api/errors/etcd/etcd.go

@@ -64,10 +64,3 @@ func InterpretDeleteError(err error, kind, name string) error {
 		return err
 	}
 }
-
-// InterpretResourceVersionError returns the appropriate api error
-// for a failure to convert the resource version of an object sent
-// to the API to an etcd uint64 index.
-func InterpretResourceVersionError(err error, kind, value string) error {
-	return errors.NewInvalid(kind, "", errors.ValidationErrorList{errors.NewFieldInvalid("resourceVersion", value)})
-}

pkg/registry/etcd/etcd.go

@@ -18,7 +18,6 @@ package etcd
 
 import (
 	"fmt"
-	"strconv"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors"
@@ -97,21 +96,6 @@ func makePodKey(ctx api.Context, id string) (string, error) {
 	return MakeEtcdItemKey(ctx, PodPath, id)
 }
 
-// ParseWatchResourceVersion takes a resource version argument and converts it to
-// the etcd version we should pass to helper.Watch(). Because resourceVersion is
-// an opaque value, the default watch behavior for non-zero watch is to watch
-// the next value (if you pass "1", you will see updates from "2" onwards).
-func ParseWatchResourceVersion(resourceVersion, kind string) (uint64, error) {
-	if resourceVersion == "" || resourceVersion == "0" {
-		return 0, nil
-	}
-	version, err := strconv.ParseUint(resourceVersion, 10, 64)
-	if err != nil {
-		return 0, etcderr.InterpretResourceVersionError(err, kind, resourceVersion)
-	}
-	return version + 1, nil
-}
-
 // ListPods obtains a list of pods with labels that match selector.
 func (r *Registry) ListPods(ctx api.Context, selector labels.Selector) (*api.PodList, error) {
 	return r.ListPodsPredicate(ctx, func(pod *api.Pod) bool {
@@ -143,7 +127,7 @@ func (r *Registry) ListPodsPredicate(ctx api.Context, filter func(*api.Pod) bool
 
 // WatchPods begins watching for new, changed, or deleted pods.
 func (r *Registry) WatchPods(ctx api.Context, resourceVersion string, filter func(*api.Pod) bool) (watch.Interface, error) {
-	version, err := ParseWatchResourceVersion(resourceVersion, "pod")
+	version, err := tools.ParseWatchResourceVersion(resourceVersion, "pod")
 	if err != nil {
 		return nil, err
 	}
@@ -354,7 +338,7 @@ func (r *Registry) ListControllers(ctx api.Context) (*api.ReplicationControllerL
 
 // WatchControllers begins watching for new, changed, or deleted controllers.
 func (r *Registry) WatchControllers(ctx api.Context, resourceVersion string) (watch.Interface, error) {
-	version, err := ParseWatchResourceVersion(resourceVersion, "replicationControllers")
+	version, err := tools.ParseWatchResourceVersion(resourceVersion, "replicationControllers")
 	if err != nil {
 		return nil, err
 	}
@@ -516,7 +500,7 @@ func (r *Registry) UpdateService(ctx api.Context, svc *api.Service) error {
 
 // WatchServices begins watching for new, changed, or deleted service configurations.
 func (r *Registry) WatchServices(ctx api.Context, label, field labels.Selector, resourceVersion string) (watch.Interface, error) {
-	version, err := ParseWatchResourceVersion(resourceVersion, "service")
+	version, err := tools.ParseWatchResourceVersion(resourceVersion, "service")
 	if err != nil {
 		return nil, err
 	}
@@ -561,7 +545,7 @@ func (r *Registry) UpdateEndpoints(ctx api.Context, endpoints *api.Endpoints) er
 
 // WatchEndpoints begins watching for new, changed, or deleted endpoint configurations.
 func (r *Registry) WatchEndpoints(ctx api.Context, label, field labels.Selector, resourceVersion string) (watch.Interface, error) {
-	version, err := ParseWatchResourceVersion(resourceVersion, "endpoints")
+	version, err := tools.ParseWatchResourceVersion(resourceVersion, "endpoints")
 	if err != nil {
 		return nil, err
 	}

pkg/registry/etcd/etcd_test.go

@@ -42,41 +42,6 @@ func NewTestEtcdRegistry(client tools.EtcdClient) *Registry {
 	return registry
 }
 
-func TestEtcdParseWatchResourceVersion(t *testing.T) {
-	testCases := []struct {
-		Version       string
-		Kind          string
-		ExpectVersion uint64
-		Err           bool
-	}{
-		{Version: "", ExpectVersion: 0},
-		{Version: "a", Err: true},
-		{Version: " ", Err: true},
-		{Version: "1", ExpectVersion: 2},
-		{Version: "10", ExpectVersion: 11},
-	}
-	for _, testCase := range testCases {
-		version, err := ParseWatchResourceVersion(testCase.Version, testCase.Kind)
-		switch {
-		case testCase.Err:
-			if err == nil {
-				t.Errorf("%s: unexpected non-error", testCase.Version)
-				continue
-			}
-			if !errors.IsInvalid(err) {
-				t.Errorf("%s: unexpected error: %v", testCase.Version, err)
-				continue
-			}
-		case !testCase.Err && err != nil:
-			t.Errorf("%s: unexpected error: %v", testCase.Version, err)
-			continue
-		}
-		if version != testCase.ExpectVersion {
-			t.Errorf("%s: expected version %d but was %d", testCase.Version, testCase.ExpectVersion, version)
-		}
-	}
-}
-
 // TestEtcdGetPodDifferentNamespace ensures same-name pods in different namespaces do not clash
 func TestEtcdGetPodDifferentNamespace(t *testing.T) {
 	fakeClient := tools.NewFakeEtcdClient(t)

pkg/registry/event/rest.go

@@ -109,7 +109,7 @@ func (rs *REST) List(ctx api.Context, label, field labels.Selector) (runtime.Obj
 
 // Watch returns Events events via a watch.Interface.
 // It implements apiserver.ResourceWatcher.
-func (rs *REST) Watch(ctx api.Context, label, field labels.Selector, resourceVersion uint64) (watch.Interface, error) {
+func (rs *REST) Watch(ctx api.Context, label, field labels.Selector, resourceVersion string) (watch.Interface, error) {
 	return rs.registry.Watch(ctx, &generic.SelectionPredicate{label, field, rs.getAttrs}, resourceVersion)
 }
 

pkg/registry/event/rest_test.go

@@ -22,6 +22,7 @@ import (
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/testapi"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/apiserver"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/registry/registrytest"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
@@ -50,6 +51,8 @@ func TestRESTCreate(t *testing.T) {
 	if e, a := eventA, (<-c).Object; !reflect.DeepEqual(e, a) {
 		t.Errorf("diff: %s", util.ObjectDiff(e, a))
 	}
+	// Ensure we implement the interface
+	_ = apiserver.ResourceWatcher(rest)
 }
 
 func TestRESTDelete(t *testing.T) {
@@ -216,7 +219,7 @@ func TestRESTWatch(t *testing.T) {
 		Reason: "forTesting",
 	}
 	reg, rest := NewTestREST()
-	wi, err := rest.Watch(api.NewContext(), labels.Everything(), labels.Everything(), 0)
+	wi, err := rest.Watch(api.NewContext(), labels.Everything(), labels.Everything(), "0")
 	if err != nil {
 		t.Fatalf("Unexpected error %v", err)
 	}

pkg/registry/generic/etcd/etcd.go

@@ -91,8 +91,12 @@ func (e *Etcd) Delete(ctx api.Context, id string) error {
 
 // Watch starts a watch for the items that m matches.
 // TODO: Detect if m references a single object instead of a list.
-func (e *Etcd) Watch(ctx api.Context, m generic.Matcher, resourceVersion uint64) (watch.Interface, error) {
-	return e.Helper.WatchList(e.KeyRoot, resourceVersion, func(obj runtime.Object) bool {
+func (e *Etcd) Watch(ctx api.Context, m generic.Matcher, resourceVersion string) (watch.Interface, error) {
+	version, err := tools.ParseWatchResourceVersion(resourceVersion, e.EndpointName)
+	if err != nil {
+		return nil, err
+	}
+	return e.Helper.WatchList(e.KeyRoot, version, func(obj runtime.Object) bool {
 		matches, err := m.Matches(obj)
 		return err == nil && matches
 	})

pkg/registry/generic/etcd/etcd_test.go

@@ -417,7 +417,7 @@ func TestEtcdWatch(t *testing.T) {
 	}
 
 	fakeClient, registry := NewTestGenericEtcdRegistry(t)
-	wi, err := registry.Watch(api.NewContext(), EverythingMatcher{}, 1)
+	wi, err := registry.Watch(api.NewContext(), EverythingMatcher{}, "1")
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}

pkg/registry/generic/registry.go

@@ -76,7 +76,7 @@ type Registry interface {
 	Update(ctx api.Context, id string, obj runtime.Object) error
 	Get(ctx api.Context, id string) (runtime.Object, error)
 	Delete(ctx api.Context, id string) error
-	Watch(ctx api.Context, m Matcher, resourceVersion uint64) (watch.Interface, error)
+	Watch(ctx api.Context, m Matcher, resourceVersion string) (watch.Interface, error)
 }
 
 // FilterList filters any list object that conforms to the api conventions,

pkg/registry/registrytest/generic.go

@@ -52,7 +52,7 @@ func (r *GenericRegistry) List(ctx api.Context, m generic.Matcher) (runtime.Obje
 	return generic.FilterList(r.ObjectList, m)
 }
 
-func (r *GenericRegistry) Watch(ctx api.Context, m generic.Matcher, resourceVersion uint64) (watch.Interface, error) {
+func (r *GenericRegistry) Watch(ctx api.Context, m generic.Matcher, resourceVersion string) (watch.Interface, error) {
 	// TODO: wire filter down into the mux; it needs access to current and previous state :(
 	return r.Mux.Watch(), nil
 }

pkg/tools/etcd_tools_watch.go

@@ -17,13 +17,16 @@ limitations under the License.
 package tools
 
 import (
+	"strconv"
 	"sync"
 	"time"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/watch"
+
 	"github.com/coreos/go-etcd/etcd"
 	"github.com/golang/glog"
 )
@@ -37,6 +40,21 @@ func Everything(runtime.Object) bool {
 	return true
 }
 
+// ParseWatchResourceVersion takes a resource version argument and converts it to
+// the etcd version we should pass to helper.Watch(). Because resourceVersion is
+// an opaque value, the default watch behavior for non-zero watch is to watch
+// the next value (if you pass "1", you will see updates from "2" onwards).
+func ParseWatchResourceVersion(resourceVersion, kind string) (uint64, error) {
+	if resourceVersion == "" || resourceVersion == "0" {
+		return 0, nil
+	}
+	version, err := strconv.ParseUint(resourceVersion, 10, 64)
+	if err != nil {
+		return 0, errors.NewInvalid(kind, "", errors.ValidationErrorList{errors.NewFieldInvalid("resourceVersion", resourceVersion)})
+	}
+	return version + 1, nil
+}
+
 // WatchList begins watching the specified key's items. Items are decoded into
 // API objects, and any items passing 'filter' are sent down the returned
 // watch.Interface. resourceVersion may be used to specify what version to begin

pkg/tools/etcd_tools_watch_test.go

@@ -23,6 +23,7 @@ import (
 	"time"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/latest"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/watch"
@@ -601,3 +602,38 @@ func TestWatchPurposefulShutdown(t *testing.T) {
 		t.Errorf("An injected error did not cause a graceful shutdown")
 	}
 }
+
+func TestEtcdParseWatchResourceVersion(t *testing.T) {
+	testCases := []struct {
+		Version       string
+		Kind          string
+		ExpectVersion uint64
+		Err           bool
+	}{
+		{Version: "", ExpectVersion: 0},
+		{Version: "a", Err: true},
+		{Version: " ", Err: true},
+		{Version: "1", ExpectVersion: 2},
+		{Version: "10", ExpectVersion: 11},
+	}
+	for _, testCase := range testCases {
+		version, err := ParseWatchResourceVersion(testCase.Version, testCase.Kind)
+		switch {
+		case testCase.Err:
+			if err == nil {
+				t.Errorf("%s: unexpected non-error", testCase.Version)
+				continue
+			}
+			if !errors.IsInvalid(err) {
+				t.Errorf("%s: unexpected error: %v", testCase.Version, err)
+				continue
+			}
+		case !testCase.Err && err != nil:
+			t.Errorf("%s: unexpected error: %v", testCase.Version, err)
+			continue
+		}
+		if version != testCase.ExpectVersion {
+			t.Errorf("%s: expected version %d but was %d", testCase.Version, testCase.ExpectVersion, version)
+		}
+	}
+}