manuallly handle encoding and decoding in the scale client

staging/src/k8s.io/client-go/scale/client.go

@@ -21,6 +21,7 @@ import (
 
 	autoscaling "k8s.io/api/autoscaling/v1"
 	"k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	serializer "k8s.io/apimachinery/pkg/runtime/serializer"
 	"k8s.io/client-go/dynamic"
@@ -129,21 +130,29 @@ func (c *namespacedScaleClient) Get(resource schema.GroupResource, name string)
 		return nil, fmt.Errorf("unable to get client for %s: %v", resource.String(), err)
 	}
 
-	rawObj, err := c.client.clientBase.Get().
+	result := c.client.clientBase.Get().
 		AbsPath(path).
 		Namespace(c.namespace).
 		Resource(gvr.Resource).
 		Name(name).
 		SubResource("scale").
-		Do().
-		Get()
+		Do()
+	if err := result.Error(); err != nil {
+		return nil, fmt.Errorf("could not fetch the scale for %s %s: %v", resource.String(), name, err)
+	}
 
+	scaleBytes, err := result.Raw()
+	if err != nil {
+		return nil, err
+	}
+	decoder := scaleConverter.codecs.UniversalDecoder(scaleConverter.ScaleVersions()...)
+	rawScaleObj, err := runtime.Decode(decoder, scaleBytes)
 	if err != nil {
 		return nil, err
 	}
 
 	// convert whatever this is to autoscaling/v1.Scale
-	scaleObj, err := scaleConverter.ConvertToVersion(rawObj, autoscaling.SchemeGroupVersion)
+	scaleObj, err := scaleConverter.ConvertToVersion(rawScaleObj, autoscaling.SchemeGroupVersion)
 	if err != nil {
 		return nil, fmt.Errorf("received an object from a /scale endpoint which was not convertible to autoscaling Scale: %v", err)
 	}
@@ -158,7 +167,7 @@ func (c *namespacedScaleClient) Update(resource schema.GroupResource, scale *aut
 	}
 
 	// Currently, a /scale endpoint can receive and return different scale types.
-	// Until we hvae support for the alternative API representations proposal,
+	// Until we have support for the alternative API representations proposal,
 	// we need to deal with sending and accepting differnet API versions.
 
 	// figure out what scale we actually need here
@@ -170,25 +179,39 @@ func (c *namespacedScaleClient) Update(resource schema.GroupResource, scale *aut
 	// convert this to whatever this endpoint wants
 	scaleUpdate, err := scaleConverter.ConvertToVersion(scale, desiredGVK.GroupVersion())
 	if err != nil {
-		return nil, fmt.Errorf("could not convert scale update to internal Scale: %v", err)
+		return nil, fmt.Errorf("could not convert scale update to external Scale: %v", err)
+	}
+	encoder := scaleConverter.codecs.LegacyCodec(desiredGVK.GroupVersion())
+	scaleUpdateBytes, err := runtime.Encode(encoder, scaleUpdate)
+	if err != nil {
+		return nil, fmt.Errorf("could not encode scale update to external Scale: %v", err)
 	}
 
-	rawObj, err := c.client.clientBase.Put().
+	result := c.client.clientBase.Put().
 		AbsPath(path).
 		Namespace(c.namespace).
 		Resource(gvr.Resource).
 		Name(scale.Name).
 		SubResource("scale").
-		Body(scaleUpdate).
-		Do().
-		Get()
+		Body(scaleUpdateBytes).
+		Do()
+	if err := result.Error(); err != nil {
+		panic(err)
+		return nil, fmt.Errorf("could not update the scale for %s %s: %v", resource.String(), scale.Name, err)
+	}
 
+	scaleBytes, err := result.Raw()
+	if err != nil {
+		return nil, err
+	}
+	decoder := scaleConverter.codecs.UniversalDecoder(scaleConverter.ScaleVersions()...)
+	rawScaleObj, err := runtime.Decode(decoder, scaleBytes)
 	if err != nil {
-		return nil, fmt.Errorf("could not fetch the scale for %s %s: %v", resource.String(), scale.Name, err)
+		return nil, err
 	}
 
 	// convert whatever this is back to autoscaling/v1.Scale
-	scaleObj, err := scaleConverter.ConvertToVersion(rawObj, autoscaling.SchemeGroupVersion)
+	scaleObj, err := scaleConverter.ConvertToVersion(rawScaleObj, autoscaling.SchemeGroupVersion)
 	if err != nil {
 		return nil, fmt.Errorf("received an object from a /scale endpoint which was not convertible to autoscaling Scale: %v", err)
 	}

staging/src/k8s.io/client-go/scale/util.go

@@ -23,6 +23,7 @@ import (
 
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
+	serializer "k8s.io/apimachinery/pkg/runtime/serializer"
 	"k8s.io/client-go/discovery"
 	scalescheme "k8s.io/client-go/scale/scheme"
 	scaleappsint "k8s.io/client-go/scale/scheme/appsint"
@@ -124,6 +125,7 @@ func NewDiscoveryScaleKindResolver(client discovery.ServerResourcesInterface) Sc
 // ScaleConverter knows how to convert between external scale versions.
 type ScaleConverter struct {
 	scheme            *runtime.Scheme
+	codecs            serializer.CodecFactory
 	internalVersioner runtime.GroupVersioner
 }
 
@@ -141,6 +143,7 @@ func NewScaleConverter() *ScaleConverter {
 
 	return &ScaleConverter{
 		scheme: scheme,
+		codecs: serializer.NewCodecFactory(scheme),
 		internalVersioner: runtime.NewMultiGroupVersioner(
 			scalescheme.SchemeGroupVersion,
 			schema.GroupKind{Group: scaleext.GroupName, Kind: "Scale"},
@@ -156,6 +159,22 @@ func (c *ScaleConverter) Scheme() *runtime.Scheme {
 	return c.scheme
 }
 
+func (c *ScaleConverter) Codecs() serializer.CodecFactory {
+	return c.codecs
+}
+
+func (c *ScaleConverter) ScaleVersions() []schema.GroupVersion {
+	return []schema.GroupVersion{
+		scaleautoscaling.SchemeGroupVersion,
+		scalescheme.SchemeGroupVersion,
+		scaleext.SchemeGroupVersion,
+		scaleextint.SchemeGroupVersion,
+		scaleappsint.SchemeGroupVersion,
+		scaleappsv1beta1.SchemeGroupVersion,
+		scaleappsv1beta2.SchemeGroupVersion,
+	}
+}
+
 // ConvertToVersion converts the given *external* input object to the given output *external* output group-version.
 func (c *ScaleConverter) ConvertToVersion(in runtime.Object, outVersion schema.GroupVersion) (runtime.Object, error) {
 	scaleInt, err := c.scheme.ConvertToVersion(in, c.internalVersioner)