// MetaNamespaceIndexFunc is a default index function that indexes based on an object's namespace
func MetaNamespaceIndexFunc(obj interface{}) ([]string, error) {
meta, err := meta.Accessor(obj)
if err != nil {
return []string{""}, fmt.Errorf("object has no meta: %v", err)
}
return []string{meta.GetNamespace()}, nil
}
// GetReference returns an ObjectReference which refers to the given
// object, or an error if the object doesn't follow the conventions
// that would allow this.
// TODO: should take a meta.Interface see http://issue.k8s.io/7127
func GetReference(obj runtime.Object) (*ObjectReference, error) {
if obj == nil {
return nil, ErrNilObject
}
if ref, ok := obj.(*ObjectReference); ok {
// Don't make a reference to a reference.
return ref, nil
}
meta, err := meta.Accessor(obj)
if err != nil {
return nil, err
}
gvk := obj.GetObjectKind().GroupVersionKind()
// if the object referenced is actually persisted, we can just get kind from meta
// if we are building an object reference to something not yet persisted, we should fallback to scheme
var kind string
if gvk != nil {
kind = gvk.Kind
}
if len(kind) == 0 {
// TODO: this is wrong
gvk, err := Scheme.ObjectKind(obj)
if err != nil {
return nil, err
}
kind = gvk.Kind
}
// if the object referenced is actually persisted, we can also get version from meta
var version string
if gvk != nil {
version = gvk.GroupVersion().String()
}
if len(version) == 0 {
selfLink := meta.GetSelfLink()
if len(selfLink) == 0 {
return nil, ErrNoSelfLink
}
selfLinkUrl, err := url.Parse(selfLink)
if err != nil {
return nil, err
}
// example paths: /<prefix>/<version>/*
parts := strings.Split(selfLinkUrl.Path, "/")
if len(parts) < 3 {
return nil, fmt.Errorf("unexpected self link format: '%v'; got version '%v'", selfLink, version)
}
version = parts[2]
}
return &ObjectReference{
Kind: kind,
APIVersion: version,
Name: meta.GetName(),
Namespace: meta.GetNamespace(),
UID: meta.GetUID(),
ResourceVersion: meta.GetResourceVersion(),
}, nil
}