// 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
}
// EncodeToStream ensures the provided object is output in the right scheme. If overrides are specified, when
// encoding the object the first override that matches the object's group is used. Other overrides are ignored.
func (c *codec) EncodeToStream(obj runtime.Object, w io.Writer, overrides ...unversioned.GroupVersion) error {
if _, ok := obj.(*runtime.Unknown); ok {
return c.serializer.EncodeToStream(obj, w, overrides...)
}
gvk, isUnversioned, err := c.typer.ObjectKind(obj)
if err != nil {
return err
}
if (c.encodeVersion == nil && len(overrides) == 0) || isUnversioned {
old := obj.GetObjectKind().GroupVersionKind()
obj.GetObjectKind().SetGroupVersionKind(gvk)
defer obj.GetObjectKind().SetGroupVersionKind(old)
return c.serializer.EncodeToStream(obj, w, overrides...)
}
targetGV, ok := c.encodeVersion[gvk.Group]
// use override if provided
for i, override := range overrides {
if override.Group == gvk.Group {
ok = true
targetGV = override
// swap the position of the override
overrides[0], overrides[i] = targetGV, overrides[0]
break
}
}
// attempt a conversion to the sole encode version
if !ok && len(c.encodeVersion) == 1 {
ok = true
for _, v := range c.encodeVersion {
targetGV = v
}
// ensure the target override is first
overrides = promoteOrPrependGroupVersion(targetGV, overrides)
}
// if no fallback is available, error
if !ok {
return fmt.Errorf("the codec does not recognize group %q for kind %q and cannot encode it", gvk.Group, gvk.Kind)
}
// Perform a conversion if necessary
if gvk.GroupVersion() != targetGV {
out, err := c.convertor.ConvertToVersion(obj, targetGV.String())
if err != nil {
if ok {
return err
}
} else {
obj = out
}
} else {
old := obj.GetObjectKind().GroupVersionKind()
defer obj.GetObjectKind().SetGroupVersionKind(old)
obj.GetObjectKind().SetGroupVersionKind(&unversioned.GroupVersionKind{Group: targetGV.Group, Version: targetGV.Version, Kind: gvk.Kind})
}
return c.serializer.EncodeToStream(obj, w, overrides...)
}
