add asserts for RecognizingDecoder and update protobuf serializer to implement interface

pkg/runtime/serializer/json/json.go

@@ -25,6 +25,7 @@ import (
 
 	"k8s.io/kubernetes/pkg/api/unversioned"
 	"k8s.io/kubernetes/pkg/runtime"
+	"k8s.io/kubernetes/pkg/runtime/serializer/recognizer"
 	"k8s.io/kubernetes/pkg/util/framer"
 	utilyaml "k8s.io/kubernetes/pkg/util/yaml"
 )
@@ -63,6 +64,7 @@ type Serializer struct {
 
 // Serializer implements Serializer
 var _ runtime.Serializer = &Serializer{}
+var _ recognizer.RecognizingDecoder = &Serializer{}
 
 // Decode attempts to convert the provided data into YAML or JSON, extract the stored schema kind, apply the provided default gvk, and then
 // load that data into an object matching the desired schema kind or the provided into. If into is *runtime.Unknown, the raw data will be

pkg/runtime/serializer/protobuf/protobuf.go

@@ -26,6 +26,7 @@ import (
 
 	"k8s.io/kubernetes/pkg/api/unversioned"
 	"k8s.io/kubernetes/pkg/runtime"
+	"k8s.io/kubernetes/pkg/runtime/serializer/recognizer"
 	"k8s.io/kubernetes/pkg/util/framer"
 )
 
@@ -76,6 +77,7 @@ type Serializer struct {
 }
 
 var _ runtime.Serializer = &Serializer{}
+var _ recognizer.RecognizingDecoder = &Serializer{}
 
 // Decode attempts to convert the provided data into a protobuf message, extract the stored schema kind, apply the provided default
 // gvk, and then load that data into an object matching the desired schema kind or the provided into. If into is *runtime.Unknown,
@@ -124,7 +126,7 @@ func (s *Serializer) Decode(originalData []byte, gvk *unversioned.GroupVersionKi
 
 	if intoUnknown, ok := into.(*runtime.Unknown); ok && intoUnknown != nil {
 		*intoUnknown = unk
-		if ok, _ := s.RecognizesData(bytes.NewBuffer(unk.Raw)); ok {
+		if ok, _, _ := s.RecognizesData(bytes.NewBuffer(unk.Raw)); ok {
 			intoUnknown.ContentType = s.contentType
 		}
 		return intoUnknown, &actual, nil
@@ -237,19 +239,19 @@ func (s *Serializer) Encode(obj runtime.Object, w io.Writer) error {
 }
 
 // RecognizesData implements the RecognizingDecoder interface.
-func (s *Serializer) RecognizesData(peek io.Reader) (bool, error) {
+func (s *Serializer) RecognizesData(peek io.Reader) (bool, bool, error) {
 	prefix := make([]byte, 4)
 	n, err := peek.Read(prefix)
 	if err != nil {
 		if err == io.EOF {
-			return false, nil
+			return false, false, nil
 		}
-		return false, err
+		return false, false, err
 	}
 	if n != 4 {
-		return false, nil
+		return false, false, nil
 	}
-	return bytes.Equal(s.prefix, prefix), nil
+	return bytes.Equal(s.prefix, prefix), false, nil
 }
 
 // copyKindDefaults defaults dst to the value in src if dst does not have a value set.

pkg/runtime/serializer/protobuf/protobuf_test.go

@@ -79,7 +79,7 @@ func TestRecognize(t *testing.T) {
 		{0x6b, 0x38, 0x73, 0x01},
 	}
 	for i, data := range ignores {
-		if ok, err := s.RecognizesData(bytes.NewBuffer(data)); err != nil || ok {
+		if ok, _, err := s.RecognizesData(bytes.NewBuffer(data)); err != nil || ok {
 			t.Errorf("%d: should not recognize data: %v", i, err)
 		}
 	}
@@ -88,7 +88,7 @@ func TestRecognize(t *testing.T) {
 		{0x6b, 0x38, 0x73, 0x00, 0x01},
 	}
 	for i, data := range recognizes {
-		if ok, err := s.RecognizesData(bytes.NewBuffer(data)); err != nil || !ok {
+		if ok, _, err := s.RecognizesData(bytes.NewBuffer(data)); err != nil || !ok {
 			t.Errorf("%d: should recognize data: %v", i, err)
 		}
 	}
@@ -184,7 +184,7 @@ func TestEncode(t *testing.T) {
 			continue
 		}
 
-		if ok, err := s.RecognizesData(bytes.NewBuffer(data)); !ok || err != nil {
+		if ok, _, err := s.RecognizesData(bytes.NewBuffer(data)); !ok || err != nil {
 			t.Errorf("%d: did not recognize data generated by call: %v", i, err)
 		}
 	}

pkg/runtime/serializer/recognizer/recognizer_test.go → pkg/runtime/serializer/recognizer/testing/recognizer_test.go

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-package recognizer
+package testing
 
 import (
 	"testing"
@@ -22,6 +22,7 @@ import (
 	"k8s.io/kubernetes/pkg/api/unversioned"
 	"k8s.io/kubernetes/pkg/runtime"
 	"k8s.io/kubernetes/pkg/runtime/serializer/json"
+	"k8s.io/kubernetes/pkg/runtime/serializer/recognizer"
 )
 
 type A struct{}
@@ -31,7 +32,7 @@ func (A) GetObjectKind() unversioned.ObjectKind { return unversioned.EmptyObject
 func TestRecognizer(t *testing.T) {
 	s := runtime.NewScheme()
 	s.AddKnownTypes(unversioned.GroupVersion{Version: "v1"}, &A{})
-	d := NewDecoder(
+	d := recognizer.NewDecoder(
 		json.NewSerializer(json.DefaultMetaFactory, s, s, false),
 		json.NewYAMLSerializer(json.DefaultMetaFactory, s, s),
 	)