110 lines
3.1 KiB
Go
110 lines
3.1 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package reference
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import (
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"errors"
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"fmt"
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"k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/api/meta"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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)
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var (
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// Errors that could be returned by GetReference.
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ErrNilObject = errors.New("can't reference a nil object")
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)
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// GetReference returns an ObjectReference which refers to the given
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// object, or an error if the object doesn't follow the conventions
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// that would allow this.
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// TODO: should take a meta.Interface see http://issue.k8s.io/7127
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func GetReference(scheme *runtime.Scheme, obj runtime.Object) (*v1.ObjectReference, error) {
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if obj == nil {
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return nil, ErrNilObject
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}
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if ref, ok := obj.(*v1.ObjectReference); ok {
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// Don't make a reference to a reference.
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return ref, nil
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}
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// An object that implements only List has enough metadata to build a reference
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var listMeta metav1.Common
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objectMeta, err := meta.Accessor(obj)
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if err != nil {
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listMeta, err = meta.CommonAccessor(obj)
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if err != nil {
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return nil, err
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}
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} else {
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listMeta = objectMeta
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}
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gvk := obj.GetObjectKind().GroupVersionKind()
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// If object meta doesn't contain data about kind and/or version,
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// we are falling back to scheme.
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//
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// TODO: This doesn't work for CRDs, which are not registered in scheme.
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if gvk.Empty() {
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gvks, _, err := scheme.ObjectKinds(obj)
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if err != nil {
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return nil, err
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}
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if len(gvks) == 0 || gvks[0].Empty() {
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return nil, fmt.Errorf("unexpected gvks registered for object %T: %v", obj, gvks)
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}
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// TODO: The same object can be registered for multiple group versions
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// (although in practise this doesn't seem to be used).
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// In such case, the version set may not be correct.
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gvk = gvks[0]
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}
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kind := gvk.Kind
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version := gvk.GroupVersion().String()
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// only has list metadata
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if objectMeta == nil {
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return &v1.ObjectReference{
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Kind: kind,
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APIVersion: version,
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ResourceVersion: listMeta.GetResourceVersion(),
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}, nil
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}
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return &v1.ObjectReference{
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Kind: kind,
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APIVersion: version,
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Name: objectMeta.GetName(),
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Namespace: objectMeta.GetNamespace(),
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UID: objectMeta.GetUID(),
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ResourceVersion: objectMeta.GetResourceVersion(),
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}, nil
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}
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// GetPartialReference is exactly like GetReference, but allows you to set the FieldPath.
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func GetPartialReference(scheme *runtime.Scheme, obj runtime.Object, fieldPath string) (*v1.ObjectReference, error) {
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ref, err := GetReference(scheme, obj)
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if err != nil {
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return nil, err
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}
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ref.FieldPath = fieldPath
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return ref, nil
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}
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