Convert List query parameters via object conversion

hack/lib/util.sh

@@ -43,6 +43,16 @@ kube::util::wait_for_url() {
   return 1
 }
 
+# Create a temp dir that'll be deleted at the end of this bash session.
+#
+# Vars set:
+#   KUBE_TEMP
+kube::util::ensure-temp-dir() {
+  if [[ -z ${KUBE_TEMP-} ]]; then
+    KUBE_TEMP=$(mktemp -d -t kubernetes.XXXXXX)
+  fi
+}
+
 # This figures out the host platform without relying on golang.  We need this as
 # we don't want a golang install to be a prerequisite to building yet we need
 # this info to figure out where the final binaries are placed.

hack/test-cmd.sh

@@ -33,12 +33,14 @@ function cleanup()
     [[ -n ${PROXY_PID-} ]] && kill ${PROXY_PID} 1>&2 2>/dev/null
 
     kube::etcd::cleanup
+    rm -rf "${KUBE_TEMP}"
 
     kube::log::status "Clean up complete"
 }
 
 trap cleanup EXIT SIGINT
 
+kube::util::ensure-temp-dir
 kube::etcd::start
 
 ETCD_HOST=${ETCD_HOST:-127.0.0.1}
@@ -533,6 +535,7 @@ __EOF__
 
   kube::test::describe_object_assert nodes "127.0.0.1" "Name:" "Labels:" "CreationTimestamp:" "Conditions:" "Addresses:" "Capacity:" "Pods:"
 
+
   ###########
   # Minions #
   ###########
@@ -548,6 +551,7 @@ __EOF__
     kube::test::describe_object_assert minions "127.0.0.1" "Name:" "Conditions:" "Addresses:" "Capacity:" "Pods:"
   fi
 
+
   #####################
   # Retrieve multiple #
   #####################
@@ -555,6 +559,19 @@ __EOF__
   kube::log::status "Testing kubectl(${version}:multiget)"
   kube::test::get_object_assert 'nodes/127.0.0.1 service/kubernetes' "{{range.items}}{{.$id_field}}:{{end}}" '127.0.0.1:kubernetes:'
 
+
+  ###########
+  # Swagger #
+  ###########
+
+  if [[ -n "${version}" ]]; then
+    # Verify schema
+    file="${KUBE_TEMP}/schema-${version}.json"
+    curl -s "http://127.0.0.1:${API_PORT}/swaggerapi/api/${version}" > "${file}"
+    [[ "$(grep "list of returned" "${file}")" ]]
+    [[ "$(grep "list of pods" "${file}")" ]]
+  fi
+
   kube::test::clear_all
 done
 

pkg/api/conversion.go

@@ -19,6 +19,8 @@ package api
 import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/resource"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/conversion"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/fields"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 )
@@ -28,12 +30,48 @@ import (
 var Codec = runtime.CodecFor(Scheme, "")
 
 func init() {
+	Scheme.AddDefaultingFuncs(
+		func(obj *ListOptions) {
+			obj.LabelSelector = labels.Everything()
+			obj.FieldSelector = fields.Everything()
+		},
+	)
 	Scheme.AddConversionFuncs(
 		func(in *util.Time, out *util.Time, s conversion.Scope) error {
 			// Cannot deep copy these, because time.Time has unexported fields.
 			*out = *in
 			return nil
 		},
+		func(in *string, out *labels.Selector, s conversion.Scope) error {
+			selector, err := labels.Parse(*in)
+			if err != nil {
+				return err
+			}
+			*out = selector
+			return nil
+		},
+		func(in *string, out *fields.Selector, s conversion.Scope) error {
+			selector, err := fields.ParseSelector(*in)
+			if err != nil {
+				return err
+			}
+			*out = selector
+			return nil
+		},
+		func(in *labels.Selector, out *string, s conversion.Scope) error {
+			if *in == nil {
+				return nil
+			}
+			*out = (*in).String()
+			return nil
+		},
+		func(in *fields.Selector, out *string, s conversion.Scope) error {
+			if *in == nil {
+				return nil
+			}
+			*out = (*in).String()
+			return nil
+		},
 		func(in *resource.Quantity, out *resource.Quantity, s conversion.Scope) error {
 			// Cannot deep copy these, because inf.Dec has unexported fields.
 			*out = *in.Copy()

pkg/api/helpers.go

@@ -21,6 +21,8 @@ import (
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/resource"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/conversion"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/fields"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
 
 	"github.com/davecgh/go-spew/spew"
@@ -63,6 +65,12 @@ var Semantic = conversion.EqualitiesOrDie(
 	func(a, b util.Time) bool {
 		return a.UTC() == b.UTC()
 	},
+	func(a, b labels.Selector) bool {
+		return a.String() == b.String()
+	},
+	func(a, b fields.Selector) bool {
+		return a.String() == b.String()
+	},
 )
 
 var standardResources = util.NewStringSet(

pkg/api/meta/restmapper.go

@@ -14,6 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+// TODO: move everything in this file to pkg/api/rest
 package meta
 
 import (

pkg/api/meta/restmapper_test.go

@@ -38,10 +38,18 @@ func (fakeCodec) DecodeInto([]byte, runtime.Object) error {
 
 type fakeConvertor struct{}
 
+func (fakeConvertor) Convert(in, out interface{}) error {
+	return nil
+}
+
 func (fakeConvertor) ConvertToVersion(in runtime.Object, _ string) (runtime.Object, error) {
 	return in, nil
 }
 
+func (fakeConvertor) ConvertFieldLabel(version, kind, label, value string) (string, string, error) {
+	return label, value, nil
+}
+
 var validCodec = fakeCodec{}
 var validAccessor = resourceAccessor{}
 var validConvertor = fakeConvertor{}

pkg/api/register.go

@@ -52,11 +52,12 @@ func init() {
 		&NamespaceList{},
 		&Secret{},
 		&SecretList{},
-		&DeleteOptions{},
 		&PersistentVolume{},
 		&PersistentVolumeList{},
 		&PersistentVolumeClaim{},
 		&PersistentVolumeClaimList{},
+		&DeleteOptions{},
+		&ListOptions{},
 	)
 	// Legacy names are supported
 	Scheme.AddKnownTypeWithName("", "Minion", &Node{})
@@ -90,8 +91,9 @@ func (*Namespace) IsAnAPIObject()                 {}
 func (*NamespaceList) IsAnAPIObject()             {}
 func (*Secret) IsAnAPIObject()                    {}
 func (*SecretList) IsAnAPIObject()                {}
-func (*DeleteOptions) IsAnAPIObject()             {}
 func (*PersistentVolume) IsAnAPIObject()          {}
 func (*PersistentVolumeList) IsAnAPIObject()      {}
 func (*PersistentVolumeClaim) IsAnAPIObject()     {}
 func (*PersistentVolumeClaimList) IsAnAPIObject() {}
+func (*DeleteOptions) IsAnAPIObject()             {}
+func (*ListOptions) IsAnAPIObject()               {}

pkg/api/serialization_test.go

@@ -129,7 +129,7 @@ func TestList(t *testing.T) {
 }
 
 var nonRoundTrippableTypes = util.NewStringSet("ContainerManifest", "ContainerManifestList")
-var nonInternalRoundTrippableTypes = util.NewStringSet("List")
+var nonInternalRoundTrippableTypes = util.NewStringSet("List", "ListOptions")
 
 func TestRoundTripTypes(t *testing.T) {
 	// api.Scheme.Log(t)

pkg/api/testing/fuzzer.go

@@ -24,6 +24,8 @@ import (
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/resource"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/fields"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/types"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
@@ -88,6 +90,11 @@ func FuzzerFor(t *testing.T, version string, src rand.Source) *fuzz.Fuzzer {
 			j.ResourceVersion = strconv.FormatUint(c.RandUint64(), 10)
 			j.SelfLink = c.RandString()
 		},
+		func(j *api.ListOptions, c fuzz.Continue) {
+			// TODO: add some parsing
+			j.LabelSelector, _ = labels.Parse("a=b")
+			j.FieldSelector, _ = fields.ParseSelector("a=b")
+		},
 		func(j *api.PodPhase, c fuzz.Continue) {
 			statuses := []api.PodPhase{api.PodPending, api.PodRunning, api.PodFailed, api.PodUnknown}
 			*j = statuses[c.Rand.Intn(len(statuses))]

pkg/api/types.go

@@ -18,6 +18,8 @@ package api
 
 import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/resource"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/fields"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/types"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
@@ -1168,6 +1170,16 @@ type DeleteOptions struct {
 	GracePeriodSeconds *int64 `json:"gracePeriodSeconds"`
 }
 
+// ListOptions is the query options to a standard REST list call
+type ListOptions struct {
+	TypeMeta `json:",inline"`
+
+	// A selector based on labels
+	LabelSelector labels.Selector
+	// A selector based on fields
+	FieldSelector fields.Selector
+}
+
 // Status is a return value for calls that don't return other objects.
 // TODO: this could go in apiserver, but I'm including it here so clients needn't
 // import both.

pkg/api/unversioned.go

@@ -40,18 +40,20 @@ func PreV1Beta3(version string) bool {
 	return version == "v1beta1" || version == "v1beta2"
 }
 
+// TODO: remove me when watch is refactored
 func LabelSelectorQueryParam(version string) string {
 	if PreV1Beta3(version) {
 		return "labels"
 	}
-	return "label-selector"
+	return "labelSelector"
 }
 
+// TODO: remove me when watch is refactored
 func FieldSelectorQueryParam(version string) string {
 	if PreV1Beta3(version) {
 		return "fields"
 	}
-	return "field-selector"
+	return "fieldSelector"
 }
 
 // String returns available api versions as a human-friendly version string.

pkg/api/v1beta1/conversion.go

@@ -1494,7 +1494,7 @@ func init() {
 	}
 
 	// Add field conversion funcs.
-	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta1", "pods",
+	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta1", "Pod",
 		func(label, value string) (string, string, error) {
 			switch label {
 			case "name":
@@ -1514,7 +1514,7 @@ func init() {
 		// If one of the conversion functions is malformed, detect it immediately.
 		panic(err)
 	}
-	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta1", "replicationControllers",
+	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta1", "ReplicationController",
 		func(label, value string) (string, string, error) {
 			switch label {
 			case "name":
@@ -1529,7 +1529,7 @@ func init() {
 		// If one of the conversion functions is malformed, detect it immediately.
 		panic(err)
 	}
-	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta1", "events",
+	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta1", "Event",
 		func(label, value string) (string, string, error) {
 			switch label {
 			case "involvedObject.kind",
@@ -1551,7 +1551,7 @@ func init() {
 		// If one of the conversion functions is malformed, detect it immediately.
 		panic(err)
 	}
-	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta1", "namespaces",
+	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta1", "Namespace",
 		func(label, value string) (string, string, error) {
 			switch label {
 			case "status.phase":

pkg/api/v1beta1/register.go

@@ -59,11 +59,12 @@ func init() {
 		&NamespaceList{},
 		&Secret{},
 		&SecretList{},
-		&DeleteOptions{},
 		&PersistentVolume{},
 		&PersistentVolumeList{},
 		&PersistentVolumeClaim{},
 		&PersistentVolumeClaimList{},
+		&DeleteOptions{},
+		&ListOptions{},
 	)
 	// Future names are supported
 	api.Scheme.AddKnownTypeWithName("v1beta1", "Node", &Minion{})
@@ -97,8 +98,9 @@ func (*Namespace) IsAnAPIObject()                 {}
 func (*NamespaceList) IsAnAPIObject()             {}
 func (*Secret) IsAnAPIObject()                    {}
 func (*SecretList) IsAnAPIObject()                {}
-func (*DeleteOptions) IsAnAPIObject()             {}
 func (*PersistentVolume) IsAnAPIObject()          {}
 func (*PersistentVolumeList) IsAnAPIObject()      {}
 func (*PersistentVolumeClaim) IsAnAPIObject()     {}
 func (*PersistentVolumeClaimList) IsAnAPIObject() {}
+func (*DeleteOptions) IsAnAPIObject()             {}
+func (*ListOptions) IsAnAPIObject()               {}

pkg/api/v1beta1/types.go

@@ -985,6 +985,16 @@ type DeleteOptions struct {
 	GracePeriodSeconds *int64 `json:"gracePeriodSeconds" description:"the duration in seconds to wait before deleting this object; defaults to a per object value if not specified; zero means delete immediately"`
 }
 
+// ListOptions is the query options to a standard REST list call
+type ListOptions struct {
+	TypeMeta `json:",inline"`
+
+	// A selector based on labels
+	LabelSelector string `json:"labels" description:"a selector to restrict the list of returned objects by their labels; defaults to everything"`
+	// A selector based on fields
+	FieldSelector string `json:"fields" description:"a selector to restrict the list of returned objects by their fields; defaults to everything"`
+}
+
 // Status is a return value for calls that don't return other objects.
 // TODO: this could go in apiserver, but I'm including it here so clients needn't
 // import both.

pkg/api/v1beta2/conversion.go

@@ -1420,7 +1420,7 @@ func init() {
 	}
 
 	// Add field conversion funcs.
-	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta2", "pods",
+	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta2", "Pod",
 		func(label, value string) (string, string, error) {
 			switch label {
 			case "name":
@@ -1440,7 +1440,7 @@ func init() {
 		// If one of the conversion functions is malformed, detect it immediately.
 		panic(err)
 	}
-	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta2", "replicationControllers",
+	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta2", "ReplicationController",
 		func(label, value string) (string, string, error) {
 			switch label {
 			case "name":
@@ -1455,7 +1455,7 @@ func init() {
 		// If one of the conversion functions is malformed, detect it immediately.
 		panic(err)
 	}
-	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta2", "events",
+	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta2", "Event",
 		func(label, value string) (string, string, error) {
 			switch label {
 			case "involvedObject.kind",
@@ -1477,7 +1477,7 @@ func init() {
 		// If one of the conversion functions is malformed, detect it immediately.
 		panic(err)
 	}
-	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta1", "namespaces",
+	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta1", "Namespace",
 		func(label, value string) (string, string, error) {
 			switch label {
 			case "status.phase":

pkg/api/v1beta2/register.go

@@ -59,11 +59,12 @@ func init() {
 		&NamespaceList{},
 		&Secret{},
 		&SecretList{},
-		&DeleteOptions{},
 		&PersistentVolume{},
 		&PersistentVolumeList{},
 		&PersistentVolumeClaim{},
 		&PersistentVolumeClaimList{},
+		&DeleteOptions{},
+		&ListOptions{},
 	)
 	// Future names are supported
 	api.Scheme.AddKnownTypeWithName("v1beta2", "Node", &Minion{})
@@ -102,3 +103,4 @@ func (*PersistentVolumeList) IsAnAPIObject()      {}
 func (*PersistentVolumeClaim) IsAnAPIObject()     {}
 func (*PersistentVolumeClaimList) IsAnAPIObject() {}
 func (*DeleteOptions) IsAnAPIObject()             {}
+func (*ListOptions) IsAnAPIObject()               {}

pkg/api/v1beta2/types.go

@@ -999,6 +999,16 @@ type DeleteOptions struct {
 	GracePeriodSeconds *int64 `json:"gracePeriodSeconds" description:"the duration in seconds to wait before deleting this object; defaults to a per object value if not specified; zero means delete immediately"`
 }
 
+// ListOptions is the query options to a standard REST list call
+type ListOptions struct {
+	TypeMeta `json:",inline"`
+
+	// A selector based on labels
+	LabelSelector string `json:"labels" description:"a selector to restrict the list of returned objects by their labels; defaults to everything"`
+	// A selector based on fields
+	FieldSelector string `json:"fields" description:"a selector to restrict the list of returned objects by their fields; defaults to everything"`
+}
+
 // Status is a return value for calls that don't return other objects.
 // TODO: this could go in apiserver, but I'm including it here so clients needn't
 // import both.

pkg/api/v1beta3/conversion.go

@@ -24,7 +24,7 @@ import (
 
 func init() {
 	// Add field conversion funcs.
-	err := newer.Scheme.AddFieldLabelConversionFunc("v1beta3", "pods",
+	err := newer.Scheme.AddFieldLabelConversionFunc("v1beta3", "Pod",
 		func(label, value string) (string, string, error) {
 			switch label {
 			case "name",
@@ -39,7 +39,7 @@ func init() {
 		// If one of the conversion functions is malformed, detect it immediately.
 		panic(err)
 	}
-	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta3", "replicationControllers",
+	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta3", "ReplicationController",
 		func(label, value string) (string, string, error) {
 			switch label {
 			case "name":
@@ -54,7 +54,7 @@ func init() {
 		// If one of the conversion functions is malformed, detect it immediately.
 		panic(err)
 	}
-	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta3", "events",
+	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta3", "Event",
 		func(label, value string) (string, string, error) {
 			switch label {
 			case "involvedObject.kind",
@@ -75,7 +75,7 @@ func init() {
 		// If one of the conversion functions is malformed, detect it immediately.
 		panic(err)
 	}
-	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta1", "namespaces",
+	err = newer.Scheme.AddFieldLabelConversionFunc("v1beta1", "Namespace",
 		func(label, value string) (string, string, error) {
 			switch label {
 			case "status.phase":

pkg/api/v1beta3/register.go

@@ -53,11 +53,12 @@ func init() {
 		&NamespaceList{},
 		&Secret{},
 		&SecretList{},
-		&DeleteOptions{},
 		&PersistentVolume{},
 		&PersistentVolumeList{},
 		&PersistentVolumeClaim{},
 		&PersistentVolumeClaimList{},
+		&DeleteOptions{},
+		&ListOptions{},
 	)
 	// Legacy names are supported
 	api.Scheme.AddKnownTypeWithName("v1beta3", "Minion", &Node{})
@@ -96,3 +97,4 @@ func (*PersistentVolumeList) IsAnAPIObject()      {}
 func (*PersistentVolumeClaim) IsAnAPIObject()     {}
 func (*PersistentVolumeClaimList) IsAnAPIObject() {}
 func (*DeleteOptions) IsAnAPIObject()             {}
+func (*ListOptions) IsAnAPIObject()               {}

pkg/api/v1beta3/types.go

@@ -1158,6 +1158,16 @@ type DeleteOptions struct {
 	GracePeriodSeconds *int64 `json:"gracePeriodSeconds" description:"the duration in seconds to wait before deleting this object; defaults to a per object value if not specified; zero means delete immediately"`
 }
 
+// ListOptions is the query options to a standard REST list call
+type ListOptions struct {
+	TypeMeta `json:",inline"`
+
+	// A selector based on labels
+	LabelSelector string `json:"labelSelector" description:"a selector to restrict the list of returned objects by their labels; defaults to everything"`
+	// A selector based on fields
+	FieldSelector string `json:"fieldSelector" description:"a selector to restrict the list of returned objects by their fields; defaults to everything"`
+}
+
 // Status is a return value for calls that don't return other objects.
 type Status struct {
 	TypeMeta `json:",inline"`

pkg/apiserver/api_installer.go

@@ -29,6 +29,7 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/meta"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/rest"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/conversion"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 
 	"github.com/emicklei/go-restful"
@@ -60,10 +61,12 @@ func (a *APIInstaller) Install() (ws *restful.WebService, errors []error) {
 
 	// Initialize the custom handlers.
 	watchHandler := (&WatchHandler{
-		storage: a.group.Storage,
-		codec:   a.group.Codec,
-		linker:  a.group.Linker,
-		info:    a.info,
+		storage:   a.group.Storage,
+		mapper:    a.group.Mapper,
+		convertor: a.group.Convertor,
+		codec:     a.group.Codec,
+		linker:    a.group.Linker,
+		info:      a.info,
 	})
 	redirectHandler := (&RedirectHandler{a.group.Storage, a.group.Codec, a.group.Context, a.info})
 	proxyHandler := (&ProxyHandler{a.prefix + "/proxy/", a.group.Storage, a.group.Codec, a.group.Context, a.info})
@@ -99,6 +102,11 @@ func (a *APIInstaller) registerResourceHandlers(path string, storage rest.Storag
 	admit := a.group.Admit
 	context := a.group.Context
 
+	serverVersion := a.group.ServerVersion
+	if len(serverVersion) == 0 {
+		serverVersion = a.group.Version
+	}
+
 	var resource, subresource string
 	switch parts := strings.Split(path, "/"); len(parts) {
 	case 2:
@@ -152,10 +160,15 @@ func (a *APIInstaller) registerResourceHandlers(path string, storage rest.Storag
 		storageMeta = defaultStorageMetadata{}
 	}
 
+	versionedListOptions, err := a.group.Creater.New(serverVersion, "ListOptions")
+	if err != nil {
+		return err
+	}
+
 	var versionedDeleterObject runtime.Object
 	switch {
 	case isGracefulDeleter:
-		object, err := a.group.Creater.New(a.group.Version, "DeleteOptions")
+		object, err := a.group.Creater.New(serverVersion, "DeleteOptions")
 		if err != nil {
 			return err
 		}
@@ -288,11 +301,14 @@ func (a *APIInstaller) registerResourceHandlers(path string, storage rest.Storag
 	// test/integration/auth_test.go is currently the most comprehensive status code test
 
 	reqScope := RequestScope{
-		ContextFunc: ctxFn,
-		Codec:       mapping.Codec,
-		APIVersion:  a.group.Version,
-		Resource:    resource,
-		Kind:        kind,
+		ContextFunc:      ctxFn,
+		Creater:          a.group.Creater,
+		Convertor:        a.group.Convertor,
+		Codec:            mapping.Codec,
+		APIVersion:       a.group.Version,
+		ServerAPIVersion: serverVersion,
+		Resource:         resource,
+		Kind:             kind,
 	}
 	for _, action := range actions {
 		reqScope.Namer = action.Namer
@@ -314,6 +330,9 @@ func (a *APIInstaller) registerResourceHandlers(path string, storage rest.Storag
 				Operation("list" + kind).
 				Produces("application/json").
 				Writes(versionedList)
+			if err := addObjectParams(ws, route, versionedListOptions); err != nil {
+				return err
+			}
 			addParams(route, action.Params)
 			ws.Route(route)
 		case "PUT": // Update a resource.
@@ -651,6 +670,39 @@ func addParams(route *restful.RouteBuilder, params []*restful.Parameter) {
 	}
 }
 
+func addObjectParams(ws *restful.WebService, route *restful.RouteBuilder, obj runtime.Object) error {
+	sv, err := conversion.EnforcePtr(obj)
+	if err != nil {
+		return err
+	}
+	st := sv.Type()
+	switch st.Kind() {
+	case reflect.Struct:
+		for i := 0; i < st.NumField(); i++ {
+			name := st.Field(i).Name
+			sf, ok := st.FieldByName(name)
+			if !ok {
+				continue
+			}
+			switch sf.Type.Kind() {
+			case reflect.Interface, reflect.Struct:
+			default:
+				jsonTag := sf.Tag.Get("json")
+				if len(jsonTag) == 0 {
+					continue
+				}
+				jsonName := strings.SplitN(jsonTag, ",", 2)[0]
+				if len(jsonName) == 0 {
+					continue
+				}
+				desc := sf.Tag.Get("description")
+				route.Param(ws.QueryParameter(jsonName, desc).DataType(sf.Type.Name()))
+			}
+		}
+	}
+	return nil
+}
+
 // defaultStorageMetadata provides default answers to rest.StorageMetadata.
 type defaultStorageMetadata struct{}
 

pkg/apiserver/apiserver.go

@@ -102,12 +102,19 @@ type APIGroupVersion struct {
 	Root    string
 	Version string
 
+	// ServerVersion controls the Kubernetes APIVersion used for common objects in the apiserver
+	// schema like api.Status, api.DeleteOptions, and api.ListOptions. Other implementors may
+	// define a version "v1beta1" but want to use the Kubernetes "v1beta3" internal objects. If
+	// empty, defaults to Version.
+	ServerVersion string
+
 	Mapper meta.RESTMapper
 
-	Codec   runtime.Codec
-	Typer   runtime.ObjectTyper
-	Creater runtime.ObjectCreater
-	Linker  runtime.SelfLinker
+	Codec     runtime.Codec
+	Typer     runtime.ObjectTyper
+	Creater   runtime.ObjectCreater
+	Convertor runtime.ObjectConvertor
+	Linker    runtime.SelfLinker
 
 	Admit   admission.Interface
 	Context api.RequestContextMapper

pkg/apiserver/apiserver_test.go

@@ -37,6 +37,7 @@ import (
 	apierrs "github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/meta"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/rest"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/v1beta1"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/fields"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
@@ -96,11 +97,10 @@ func init() {
 	// api.Status is returned in errors
 
 	// "internal" version
-	api.Scheme.AddKnownTypes("", &Simple{}, &SimpleList{},
-		&api.Status{})
+	api.Scheme.AddKnownTypes("", &Simple{}, &SimpleList{}, &api.Status{}, &api.ListOptions{})
 	// "version" version
 	// TODO: Use versioned api objects?
-	api.Scheme.AddKnownTypes(testVersion, &Simple{}, &SimpleList{}, &api.DeleteOptions{}, &api.Status{})
+	api.Scheme.AddKnownTypes(testVersion, &Simple{}, &SimpleList{}, &v1beta1.DeleteOptions{}, &v1beta1.Status{}, &v1beta1.ListOptions{})
 
 	nsMapper := newMapper()
 	legacyNsMapper := newMapper()
@@ -156,10 +156,11 @@ func handleInternal(storage map[string]rest.Storage, admissionControl admission.
 		Root:    "/api",
 		Version: testVersion,
 
-		Creater: api.Scheme,
-		Typer:   api.Scheme,
-		Codec:   codec,
-		Linker:  selfLinker,
+		Creater:   api.Scheme,
+		Convertor: api.Scheme,
+		Typer:     api.Scheme,
+		Codec:     codec,
+		Linker:    selfLinker,
 
 		Admit:   admissionControl,
 		Context: requestContextMapper,
@@ -244,6 +245,8 @@ func (storage *SimpleRESTStorage) List(ctx api.Context, label labels.Selector, f
 	result := &SimpleList{
 		Items: storage.list,
 	}
+	storage.requestedLabelSelector = label
+	storage.requestedFieldSelector = field
 	return result, storage.errors["list"]
 }
 
@@ -522,15 +525,60 @@ func TestList(t *testing.T) {
 		namespace string
 		selfLink  string
 		legacy    bool
+		label     string
+		field     string
 	}{
-		{"/api/version/simple", "", "/api/version/simple?namespace=", true},
-		{"/api/version/simple?namespace=other", "other", "/api/version/simple?namespace=other", true},
+		{
+			url:       "/api/version/simple",
+			namespace: "",
+			selfLink:  "/api/version/simple?namespace=",
+			legacy:    true,
+		},
+		{
+			url:       "/api/version/simple?namespace=other",
+			namespace: "other",
+			selfLink:  "/api/version/simple?namespace=other",
+			legacy:    true,
+		},
+		{
+			url:       "/api/version/simple?namespace=other&labels=a%3Db&fields=c%3Dd",
+			namespace: "other",
+			selfLink:  "/api/version/simple?namespace=other",
+			legacy:    true,
+			label:     "a=b",
+			field:     "c=d",
+		},
 		// list items across all namespaces
-		{"/api/version/simple?namespace=", "", "/api/version/simple?namespace=", true},
-		{"/api/version/namespaces/default/simple", "default", "/api/version/namespaces/default/simple", false},
-		{"/api/version/namespaces/other/simple", "other", "/api/version/namespaces/other/simple", false},
+		{
+			url:       "/api/version/simple?namespace=",
+			namespace: "",
+			selfLink:  "/api/version/simple?namespace=",
+			legacy:    true,
+		},
+		// list items in a namespace, v1beta3+
+		{
+			url:       "/api/version/namespaces/default/simple",
+			namespace: "default",
+			selfLink:  "/api/version/namespaces/default/simple",
+		},
+		{
+			url:       "/api/version/namespaces/other/simple",
+			namespace: "other",
+			selfLink:  "/api/version/namespaces/other/simple",
+		},
+		{
+			url:       "/api/version/namespaces/other/simple?labels=a%3Db&fields=c%3Dd",
+			namespace: "other",
+			selfLink:  "/api/version/namespaces/other/simple",
+			label:     "a=b",
+			field:     "c=d",
+		},
 		// list items across all namespaces
-		{"/api/version/simple", "", "/api/version/simple", false},
+		{
+			url:       "/api/version/simple",
+			namespace: "",
+			selfLink:  "/api/version/simple",
+		},
 	}
 	for i, testCase := range testCases {
 		storage := map[string]rest.Storage{}
@@ -567,6 +615,12 @@ func TestList(t *testing.T) {
 		} else if simpleStorage.actualNamespace != testCase.namespace {
 			t.Errorf("%d: unexpected resource namespace: %s", i, simpleStorage.actualNamespace)
 		}
+		if simpleStorage.requestedLabelSelector == nil || simpleStorage.requestedLabelSelector.String() != testCase.label {
+			t.Errorf("%d: unexpected label selector: %v", i, simpleStorage.requestedLabelSelector)
+		}
+		if simpleStorage.requestedFieldSelector == nil || simpleStorage.requestedFieldSelector.String() != testCase.field {
+			t.Errorf("%d: unexpected field selector: %v", i, simpleStorage.requestedFieldSelector)
+		}
 	}
 }
 

pkg/apiserver/resthandler.go

@@ -19,7 +19,6 @@ package apiserver
 import (
 	"fmt"
 	"net/http"
-	"net/url"
 	gpath "path"
 	"time"
 
@@ -27,8 +26,6 @@ import (
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/rest"
-	"github.com/GoogleCloudPlatform/kubernetes/pkg/fields"
-	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 
 	"github.com/emicklei/go-restful"
@@ -64,9 +61,15 @@ type RequestScope struct {
 	Namer ScopeNamer
 	ContextFunc
 	runtime.Codec
+	Creater   runtime.ObjectCreater
+	Convertor runtime.ObjectConvertor
+
 	Resource   string
 	Kind       string
 	APIVersion string
+
+	// The version of apiserver resources to use
+	ServerAPIVersion string
 }
 
 // GetResource returns a function that handles retrieving a single resource from a rest.Storage object.
@@ -94,24 +97,6 @@ func GetResource(r rest.Getter, scope RequestScope) restful.RouteFunction {
 	}
 }
 
-func parseSelectorQueryParams(query url.Values, version, apiResource string) (label labels.Selector, field fields.Selector, err error) {
-	labelString := query.Get(api.LabelSelectorQueryParam(version))
-	label, err = labels.Parse(labelString)
-	if err != nil {
-		return nil, nil, errors.NewBadRequest(fmt.Sprintf("The 'labels' selector parameter (%s) could not be parsed: %v", labelString, err))
-	}
-
-	convertToInternalVersionFunc := func(label, value string) (newLabel, newValue string, err error) {
-		return api.Scheme.ConvertFieldLabel(version, apiResource, label, value)
-	}
-	fieldString := query.Get(api.FieldSelectorQueryParam(version))
-	field, err = fields.ParseAndTransformSelector(fieldString, convertToInternalVersionFunc)
-	if err != nil {
-		return nil, nil, errors.NewBadRequest(fmt.Sprintf("The 'fields' selector parameter (%s) could not be parsed: %v", fieldString, err))
-	}
-	return label, field, nil
-}
-
 // ListResource returns a function that handles retrieving a list of resources from a rest.Storage object.
 func ListResource(r rest.Lister, scope RequestScope) restful.RouteFunction {
 	return func(req *restful.Request, res *restful.Response) {
@@ -125,13 +110,38 @@ func ListResource(r rest.Lister, scope RequestScope) restful.RouteFunction {
 		ctx := scope.ContextFunc(req)
 		ctx = api.WithNamespace(ctx, namespace)
 
-		label, field, err := parseSelectorQueryParams(req.Request.URL.Query(), scope.APIVersion, scope.Resource)
+		// TODO: extract me into a method
+		query := req.Request.URL.Query()
+		versioned, err := scope.Creater.New(scope.ServerAPIVersion, "ListOptions")
+		if err != nil {
+			// programmer error
+			errorJSON(err, scope.Codec, w)
+			return
+		}
+		if err := scope.Convertor.Convert(&query, versioned); err != nil {
+			// bad request
+			errorJSON(err, scope.Codec, w)
+			return
+		}
+		out, err := scope.Convertor.ConvertToVersion(versioned, "")
 		if err != nil {
+			// programmer error
+			errorJSON(err, scope.Codec, w)
+			return
+		}
+		opts := *out.(*api.ListOptions)
+
+		// transform fields
+		fn := func(label, value string) (newLabel, newValue string, err error) {
+			return scope.Convertor.ConvertFieldLabel(scope.APIVersion, scope.Kind, label, value)
+		}
+		if opts.FieldSelector, err = opts.FieldSelector.Transform(fn); err != nil {
+			// invalid field
 			errorJSON(err, scope.Codec, w)
 			return
 		}
 
-		result, err := r.List(ctx, label, field)
+		result, err := r.List(ctx, opts.LabelSelector, opts.FieldSelector)
 		if err != nil {
 			errorJSON(err, scope.Codec, w)
 			return

pkg/apiserver/watch.go

@@ -19,6 +19,7 @@ package apiserver
 import (
 	"fmt"
 	"net/http"
+	"net/url"
 	"path"
 	"regexp"
 	"strings"
@@ -26,8 +27,11 @@ import (
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/meta"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/rest"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/fields"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/httplog"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/watch"
 	watchjson "github.com/GoogleCloudPlatform/kubernetes/pkg/watch/json"
@@ -36,11 +40,14 @@ import (
 	"golang.org/x/net/websocket"
 )
 
+// TODO: convert me to resthandler custom verb
 type WatchHandler struct {
-	storage map[string]rest.Storage
-	codec   runtime.Codec
-	linker  runtime.SelfLinker
-	info    *APIRequestInfoResolver
+	storage   map[string]rest.Storage
+	mapper    meta.RESTMapper
+	convertor runtime.ObjectConvertor
+	codec     runtime.Codec
+	linker    runtime.SelfLinker
+	info      *APIRequestInfoResolver
 }
 
 // setSelfLinkAddName sets the self link, appending the object's name to the canonical path & type.
@@ -96,8 +103,24 @@ func (h *WatchHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 		httpCode = errorJSON(errors.NewMethodNotSupported(requestInfo.Resource, "watch"), h.codec, w)
 		return
 	}
+	kind := requestInfo.Kind
+	if len(kind) == 0 {
+		if _, kind, err = h.mapper.VersionAndKindForResource(apiResource); err != nil {
+			glog.Errorf("No kind found for %s: %v", apiResource, err)
+		}
+	}
 
-	label, field, err := parseSelectorQueryParams(req.URL.Query(), requestInfo.APIVersion, apiResource)
+	scope := RequestScope{
+		Convertor:  h.convertor,
+		Kind:       kind,
+		Resource:   apiResource,
+		APIVersion: requestInfo.APIVersion,
+		// TODO: this must be parameterized per version, and is incorrect for implementors
+		// outside of Kubernetes. Fix by refactoring watch under resthandler as a custome
+		// resource.
+		ServerAPIVersion: requestInfo.APIVersion,
+	}
+	label, field, err := parseSelectorQueryParams(req.URL.Query(), scope)
 	if err != nil {
 		httpCode = errorJSON(err, h.codec, w)
 		return
@@ -125,6 +148,26 @@ func (h *WatchHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 	}
 }
 
+// TODO: remove when watcher is refactored to fit under api_installer
+func parseSelectorQueryParams(query url.Values, scope RequestScope) (label labels.Selector, field fields.Selector, err error) {
+	labelString := query.Get(api.LabelSelectorQueryParam(scope.ServerAPIVersion))
+	label, err = labels.Parse(labelString)
+	if err != nil {
+		return nil, nil, errors.NewBadRequest(fmt.Sprintf("The 'labels' selector parameter (%s) could not be parsed: %v", labelString, err))
+	}
+
+	fn := func(label, value string) (newLabel, newValue string, err error) {
+		return scope.Convertor.ConvertFieldLabel(scope.APIVersion, scope.Kind, label, value)
+	}
+	fieldString := query.Get(api.FieldSelectorQueryParam(scope.ServerAPIVersion))
+	field, err = fields.ParseAndTransformSelector(fieldString, fn)
+	if err != nil {
+		return nil, nil, errors.NewBadRequest(fmt.Sprintf("The 'fields' selector parameter (%s) could not be parsed: %v", fieldString, err))
+	}
+	glog.Infof("Found %#v %#v from %v in scope %#v", label, field, query, scope)
+	return label, field, nil
+}
+
 // WatchServer serves a watch.Interface over a websocket or vanilla HTTP.
 type WatchServer struct {
 	watching watch.Interface

pkg/apiserver/watch_test.go

@@ -25,6 +25,7 @@ import (
 	"testing"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/meta"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/api/rest"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/fields"
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
@@ -48,16 +49,24 @@ var watchTestTable = []struct {
 	{watch.Deleted, &Simple{ObjectMeta: api.ObjectMeta{Name: "bar"}}},
 }
 
+func init() {
+	mapper.(*meta.DefaultRESTMapper).Add(meta.RESTScopeNamespaceLegacy, "Simple", testVersion, false)
+	api.Scheme.AddFieldLabelConversionFunc(testVersion, "Simple",
+		func(label, value string) (string, string, error) {
+			return label, value, nil
+		})
+}
+
 func TestWatchWebsocket(t *testing.T) {
 	simpleStorage := &SimpleRESTStorage{}
 	_ = rest.Watcher(simpleStorage) // Give compile error if this doesn't work.
-	handler := handle(map[string]rest.Storage{"foo": simpleStorage})
+	handler := handle(map[string]rest.Storage{"simples": simpleStorage})
 	server := httptest.NewServer(handler)
 	defer server.Close()
 
 	dest, _ := url.Parse(server.URL)
 	dest.Scheme = "ws" // Required by websocket, though the server never sees it.
-	dest.Path = "/api/version/watch/foo"
+	dest.Path = "/api/version/watch/simples"
 	dest.RawQuery = ""
 
 	ws, err := websocket.Dial(dest.String(), "", "http://localhost")
@@ -103,13 +112,13 @@ func TestWatchWebsocket(t *testing.T) {
 
 func TestWatchHTTP(t *testing.T) {
 	simpleStorage := &SimpleRESTStorage{}
-	handler := handle(map[string]rest.Storage{"foo": simpleStorage})
+	handler := handle(map[string]rest.Storage{"simples": simpleStorage})
 	server := httptest.NewServer(handler)
 	defer server.Close()
 	client := http.Client{}
 
 	dest, _ := url.Parse(server.URL)
-	dest.Path = "/api/version/watch/foo"
+	dest.Path = "/api/version/watch/simples"
 	dest.RawQuery = ""
 
 	request, err := http.NewRequest("GET", dest.String(), nil)
@@ -163,17 +172,13 @@ func TestWatchHTTP(t *testing.T) {
 }
 
 func TestWatchParamParsing(t *testing.T) {
-	api.Scheme.AddFieldLabelConversionFunc(testVersion, "foo",
-		func(label, value string) (string, string, error) {
-			return label, value, nil
-		})
 	simpleStorage := &SimpleRESTStorage{}
-	handler := handle(map[string]rest.Storage{"foo": simpleStorage})
+	handler := handle(map[string]rest.Storage{"simples": simpleStorage})
 	server := httptest.NewServer(handler)
 	defer server.Close()
 
 	dest, _ := url.Parse(server.URL)
-	dest.Path = "/api/" + testVersion + "/watch/foo"
+	dest.Path = "/api/" + testVersion + "/watch/simples"
 
 	table := []struct {
 		rawQuery        string
@@ -238,14 +243,14 @@ func TestWatchParamParsing(t *testing.T) {
 
 func TestWatchProtocolSelection(t *testing.T) {
 	simpleStorage := &SimpleRESTStorage{}
-	handler := handle(map[string]rest.Storage{"foo": simpleStorage})
+	handler := handle(map[string]rest.Storage{"simples": simpleStorage})
 	server := httptest.NewServer(handler)
 	defer server.Close()
 	defer server.CloseClientConnections()
 	client := http.Client{}
 
 	dest, _ := url.Parse(server.URL)
-	dest.Path = "/api/version/watch/foo"
+	dest.Path = "/api/version/watch/simples"
 	dest.RawQuery = ""
 
 	table := []struct {

pkg/master/master.go

@@ -572,9 +572,10 @@ func (m *Master) defaultAPIGroupVersion() *apiserver.APIGroupVersion {
 
 		Mapper: latest.RESTMapper,
 
-		Creater: api.Scheme,
-		Typer:   api.Scheme,
-		Linker:  latest.SelfLinker,
+		Creater:   api.Scheme,
+		Convertor: api.Scheme,
+		Typer:     api.Scheme,
+		Linker:    latest.SelfLinker,
 
 		Admit:   m.admissionControl,
 		Context: m.requestContextMapper,

pkg/runtime/interfaces.go

@@ -35,7 +35,9 @@ type Codec interface {
 
 // ObjectConvertor converts an object to a different version.
 type ObjectConvertor interface {
+	Convert(in, out interface{}) error
 	ConvertToVersion(in Object, outVersion string) (out Object, err error)
+	ConvertFieldLabel(version, kind, label, value string) (string, string, error)
 }
 
 // ObjectTyper contains methods for extracting the APIVersion and Kind

pkg/runtime/scheme.go

@@ -18,6 +18,7 @@ package runtime
 
 import (
 	"fmt"
+	"net/url"
 	"reflect"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/conversion"
@@ -224,6 +225,9 @@ func NewScheme() *Scheme {
 	if err := s.raw.RegisterInputDefaults(&map[string][]string{}, JSONKeyMapper, conversion.AllowDifferentFieldTypeNames|conversion.IgnoreMissingFields); err != nil {
 		panic(err)
 	}
+	if err := s.raw.RegisterInputDefaults(&url.Values{}, JSONKeyMapper, conversion.AllowDifferentFieldTypeNames|conversion.IgnoreMissingFields); err != nil {
+		panic(err)
+	}
 	return s
 }
 
@@ -294,13 +298,13 @@ func (s *Scheme) AddConversionFuncs(conversionFuncs ...interface{}) error {
 }
 
 // AddFieldLabelConversionFunc adds a conversion function to convert field selectors
-// of the given api resource from the given version to internal version representation.
-func (s *Scheme) AddFieldLabelConversionFunc(version, apiResource string, conversionFunc FieldLabelConversionFunc) error {
+// of the given kind from the given version to internal version representation.
+func (s *Scheme) AddFieldLabelConversionFunc(version, kind string, conversionFunc FieldLabelConversionFunc) error {
 	if s.fieldLabelConversionFuncs[version] == nil {
 		s.fieldLabelConversionFuncs[version] = map[string]FieldLabelConversionFunc{}
 	}
 
-	s.fieldLabelConversionFuncs[version][apiResource] = conversionFunc
+	s.fieldLabelConversionFuncs[version][kind] = conversionFunc
 	return nil
 }
 
@@ -326,15 +330,15 @@ func (s *Scheme) Convert(in, out interface{}) error {
 	return s.raw.Convert(in, out)
 }
 
-// Converts the given field label and value for an apiResource field selector from
+// Converts the given field label and value for an kind field selector from
 // versioned representation to an unversioned one.
-func (s *Scheme) ConvertFieldLabel(version, apiResource, label, value string) (string, string, error) {
+func (s *Scheme) ConvertFieldLabel(version, kind, label, value string) (string, string, error) {
 	if s.fieldLabelConversionFuncs[version] == nil {
 		return "", "", fmt.Errorf("No conversion function found for version: %s", version)
 	}
-	conversionFunc, ok := s.fieldLabelConversionFuncs[version][apiResource]
+	conversionFunc, ok := s.fieldLabelConversionFuncs[version][kind]
 	if !ok {
-		return "", "", fmt.Errorf("No conversion function found for version %s and api resource %s", version, apiResource)
+		return "", "", fmt.Errorf("No conversion function found for version %s and kind %s", version, kind)
 	}
 	return conversionFunc(label, value)
 }