示例#1
0
// Decode attempts a decode of the object, then tries to convert it to the internal version. If into is provided and the decoding is
// successful, the returned runtime.Object will be the value passed as into. Note that this may bypass conversion if you pass an
// into that matches the serialized version.
func (c *codec) Decode(data []byte, defaultGVK *unversioned.GroupVersionKind, into runtime.Object) (runtime.Object, *unversioned.GroupVersionKind, error) {
	versioned, isVersioned := into.(*runtime.VersionedObjects)
	if isVersioned {
		into = versioned.Last()
	}

	obj, gvk, err := c.serializer.Decode(data, defaultGVK, into)
	if err != nil {
		return nil, gvk, err
	}

	// if we specify a target, use generic conversion.
	if into != nil {
		if into == obj {
			if isVersioned {
				return versioned, gvk, nil
			}
			return into, gvk, nil
		}
		if err := c.convertor.Convert(obj, into); err != nil {
			return nil, gvk, err
		}
		if isVersioned {
			versioned.Objects = []runtime.Object{obj, into}
			return versioned, gvk, nil
		}
		return into, gvk, nil
	}

	// invoke a version conversion
	group := gvk.Group
	if defaultGVK != nil {
		group = defaultGVK.Group
	}
	var targetGV unversioned.GroupVersion
	if c.decodeVersion == nil {
		// convert to internal by default
		targetGV.Group = group
		targetGV.Version = runtime.APIVersionInternal
	} else {
		gv, ok := c.decodeVersion[group]
		if !ok {
			// unknown objects are left in their original version
			if isVersioned {
				versioned.Objects = []runtime.Object{obj}
				return versioned, gvk, nil
			}
			return obj, gvk, nil
		}
		targetGV = gv
	}

	if gvk.GroupVersion() == targetGV {
		if isVersioned {
			versioned.Objects = []runtime.Object{obj}
			return versioned, gvk, nil
		}
		return obj, gvk, nil
	}

	if isVersioned {
		// create a copy, because ConvertToVersion does not guarantee non-mutation of objects
		copied, err := c.copier.Copy(obj)
		if err != nil {
			copied = obj
		}
		versioned.Objects = []runtime.Object{copied}
	}

	// Convert if needed.
	out, err := c.convertor.ConvertToVersion(obj, targetGV.String())
	if err != nil {
		return nil, gvk, err
	}
	if isVersioned {
		versioned.Objects = append(versioned.Objects, out)
		return versioned, gvk, nil
	}
	return out, gvk, nil
}