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Merge pull request kubernetes#1969 from smarterclayton/new_typemeta
Allow Meta lookup to work across ObjectType and ListMeta
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,19 @@ | ||
| /* | ||
| 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 meta provides functions for retrieving API metadata from objects | ||
| // belonging to the Kubernetes API | ||
| package meta |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,281 @@ | ||
| /* | ||
| 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 meta | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "reflect" | ||
|
|
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| "github.com/GoogleCloudPlatform/kubernetes/pkg/conversion" | ||
| "github.com/GoogleCloudPlatform/kubernetes/pkg/runtime" | ||
| ) | ||
|
|
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| // Interface lets you work with object metadata from any of the versioned or | ||
| // internal API objects. | ||
| type Interface interface { | ||
| Name() string | ||
| SetName(name string) | ||
| UID() string | ||
| SetUID(uid string) | ||
| APIVersion() string | ||
| SetAPIVersion(version string) | ||
| Kind() string | ||
| SetKind(kind string) | ||
| ResourceVersion() string | ||
| SetResourceVersion(version string) | ||
| SelfLink() string | ||
| SetSelfLink(selfLink string) | ||
| } | ||
|
|
||
| // Accessor takes an arbitary object pointer and returns meta.Interface. | ||
| // obj must be a pointer to an API type. An error is returned if the minimum | ||
| // required fields are missing. Fields that are not required return the default | ||
| // value and are a no-op if set. | ||
| func Accessor(obj interface{}) (Interface, error) { | ||
| v, err := conversion.EnforcePtr(obj) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| t := v.Type() | ||
| if v.Kind() != reflect.Struct { | ||
| return nil, fmt.Errorf("expected struct, but got %v: %v (%#v)", v.Kind(), t, v.Interface()) | ||
| } | ||
|
|
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| typeMeta := v.FieldByName("TypeMeta") | ||
| if !typeMeta.IsValid() { | ||
| return nil, fmt.Errorf("struct %v lacks embedded TypeMeta type", t) | ||
| } | ||
|
|
||
| a := &genericAccessor{} | ||
| if err := extractFromTypeMeta(typeMeta, a); err != nil { | ||
| return nil, fmt.Errorf("unable to find type fields on %#v", typeMeta) | ||
| } | ||
|
|
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| objectMeta := v.FieldByName("ObjectMeta") | ||
| if objectMeta.IsValid() { | ||
| // look for the ObjectMeta fields | ||
| if err := extractFromObjectMeta(objectMeta, a); err != nil { | ||
| return nil, fmt.Errorf("unable to find object fields on %#v", objectMeta) | ||
| } | ||
| } else { | ||
| listMeta := v.FieldByName("ListMeta") | ||
| if listMeta.IsValid() { | ||
| // look for the ListMeta fields | ||
| if err := extractFromListMeta(listMeta, a); err != nil { | ||
| return nil, fmt.Errorf("unable to find list fields on %#v", listMeta) | ||
| } | ||
| } else { | ||
| // look for the older TypeMeta with all metadata | ||
| if err := extractFromObjectMeta(typeMeta, a); err != nil { | ||
| return nil, fmt.Errorf("unable to find object fields on %#v", typeMeta) | ||
| } | ||
| } | ||
| } | ||
|
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| return a, nil | ||
| } | ||
|
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| // NewResourceVersioner returns a ResourceVersioner that can set or | ||
| // retrieve ResourceVersion on objects derived from TypeMeta. | ||
| func NewResourceVersioner() runtime.ResourceVersioner { | ||
| return resourceAccessor{} | ||
| } | ||
|
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| // resourceAccessor implements ResourceVersioner and SelfLinker. | ||
| type resourceAccessor struct{} | ||
|
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| func (v resourceAccessor) ResourceVersion(obj runtime.Object) (string, error) { | ||
| accessor, err := Accessor(obj) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| return accessor.ResourceVersion(), nil | ||
| } | ||
|
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| func (v resourceAccessor) SetResourceVersion(obj runtime.Object, version string) error { | ||
| accessor, err := Accessor(obj) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| accessor.SetResourceVersion(version) | ||
| return nil | ||
| } | ||
|
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| func (v resourceAccessor) Name(obj runtime.Object) (string, error) { | ||
| accessor, err := Accessor(obj) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| return accessor.Name(), nil | ||
| } | ||
|
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| func (v resourceAccessor) SelfLink(obj runtime.Object) (string, error) { | ||
| accessor, err := Accessor(obj) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| return accessor.SelfLink(), nil | ||
| } | ||
|
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| func (v resourceAccessor) SetSelfLink(obj runtime.Object, selfLink string) error { | ||
| accessor, err := Accessor(obj) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| accessor.SetSelfLink(selfLink) | ||
| return nil | ||
| } | ||
|
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| // NewSelfLinker returns a SelfLinker that works on all TypeMeta SelfLink fields. | ||
| func NewSelfLinker() runtime.SelfLinker { | ||
| return resourceAccessor{} | ||
| } | ||
|
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| // genericAccessor contains pointers to strings that can modify an arbitrary | ||
| // struct and implements the Accessor interface. | ||
| type genericAccessor struct { | ||
| name *string | ||
| uid *string | ||
| apiVersion *string | ||
| kind *string | ||
| resourceVersion *string | ||
| selfLink *string | ||
| } | ||
|
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| func (a genericAccessor) Name() string { | ||
| if a.name == nil { | ||
| return "" | ||
| } | ||
| return *a.name | ||
| } | ||
|
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| func (a genericAccessor) SetName(name string) { | ||
| if a.name == nil { | ||
| return | ||
| } | ||
| *a.name = name | ||
| } | ||
|
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| func (a genericAccessor) UID() string { | ||
| if a.uid == nil { | ||
| return "" | ||
| } | ||
| return *a.uid | ||
| } | ||
|
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| func (a genericAccessor) SetUID(uid string) { | ||
| if a.uid == nil { | ||
| return | ||
| } | ||
| *a.uid = uid | ||
| } | ||
|
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| func (a genericAccessor) APIVersion() string { | ||
| return *a.apiVersion | ||
| } | ||
|
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| func (a genericAccessor) SetAPIVersion(version string) { | ||
| *a.apiVersion = version | ||
| } | ||
|
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| func (a genericAccessor) Kind() string { | ||
| return *a.kind | ||
| } | ||
|
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| func (a genericAccessor) SetKind(kind string) { | ||
| *a.kind = kind | ||
| } | ||
|
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| func (a genericAccessor) ResourceVersion() string { | ||
| return *a.resourceVersion | ||
| } | ||
|
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| func (a genericAccessor) SetResourceVersion(version string) { | ||
| *a.resourceVersion = version | ||
| } | ||
|
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| func (a genericAccessor) SelfLink() string { | ||
| return *a.selfLink | ||
| } | ||
|
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| func (a genericAccessor) SetSelfLink(selfLink string) { | ||
| *a.selfLink = selfLink | ||
| } | ||
|
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| // fieldPtr puts the address of fieldName, which must be a member of v, | ||
| // into dest, which must be an address of a variable to which this field's | ||
| // address can be assigned. | ||
| func fieldPtr(v reflect.Value, fieldName string, dest interface{}) error { | ||
| field := v.FieldByName(fieldName) | ||
| if !field.IsValid() { | ||
| return fmt.Errorf("Couldn't find %v field in %#v", fieldName, v.Interface()) | ||
| } | ||
| v = reflect.ValueOf(dest) | ||
| if v.Kind() != reflect.Ptr { | ||
| return fmt.Errorf("dest should be ptr") | ||
| } | ||
| v = v.Elem() | ||
| field = field.Addr() | ||
| if field.Type().AssignableTo(v.Type()) { | ||
| v.Set(field) | ||
| return nil | ||
| } | ||
| if field.Type().ConvertibleTo(v.Type()) { | ||
| v.Set(field.Convert(v.Type())) | ||
| return nil | ||
| } | ||
| return fmt.Errorf("Couldn't assign/convert %v to %v", field.Type(), v.Type()) | ||
| } | ||
|
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| // extractFromTypeMeta extracts pointers to version and kind fields from an object | ||
| func extractFromTypeMeta(v reflect.Value, a *genericAccessor) error { | ||
| if err := fieldPtr(v, "APIVersion", &a.apiVersion); err != nil { | ||
| return err | ||
| } | ||
| if err := fieldPtr(v, "Kind", &a.kind); err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
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| // extractFromObjectMeta extracts pointers to metadata fields from an object | ||
| func extractFromObjectMeta(v reflect.Value, a *genericAccessor) error { | ||
| if err := fieldPtr(v, "Name", &a.name); err != nil { | ||
| return err | ||
| } | ||
| if err := fieldPtr(v, "UID", &a.uid); err != nil { | ||
| return err | ||
| } | ||
| if err := fieldPtr(v, "ResourceVersion", &a.resourceVersion); err != nil { | ||
| return err | ||
| } | ||
| if err := fieldPtr(v, "SelfLink", &a.selfLink); err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
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| // extractFromObjectMeta extracts pointers to metadata fields from a list object | ||
| func extractFromListMeta(v reflect.Value, a *genericAccessor) error { | ||
| if err := fieldPtr(v, "ResourceVersion", &a.resourceVersion); err != nil { | ||
| return err | ||
| } | ||
| if err := fieldPtr(v, "SelfLink", &a.selfLink); err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } |
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