Exemplo n.º 1
0
// estimateUnknownSize returns the expected bytes consumed by a given runtime.Unknown
// object with a nil RawJSON struct and the expected size of the provided buffer. The
// returned size will not be correct if RawJSOn is set on unk.
func estimateUnknownSize(unk *runtime.Unknown, byteSize uint64) uint64 {
	size := uint64(unk.Size())
	// protobuf uses 1 byte for the tag, a varint for the length of the array (at most 8 bytes - uint64 - here),
	// and the size of the array.
	size += 1 + 8 + byteSize
	return size
}
Exemplo n.º 2
0
// Decode attempts to convert the provided data into a protobuf message, extract the stored schema kind, apply the provided default
// gvk, and then load that data into an object matching the desired schema kind or the provided into. If into is *runtime.Unknown,
// the raw data will be extracted and no decoding will be performed. If into is not registered with the typer, then the object will
// be straight decoded using normal protobuf unmarshalling (the MarshalTo interface). If into is provided and the original data is
// not fully qualified with kind/version/group, the type of the into will be used to alter the returned gvk. On success or most
// errors, the method will return the calculated schema kind.
func (s *Serializer) Decode(originalData []byte, gvk *unversioned.GroupVersionKind, into runtime.Object) (runtime.Object, *unversioned.GroupVersionKind, error) {
	if versioned, ok := into.(*runtime.VersionedObjects); ok {
		into = versioned.Last()
		obj, actual, err := s.Decode(originalData, gvk, into)
		if err != nil {
			return nil, actual, err
		}
		// the last item in versioned becomes into, so if versioned was not originally empty we reset the object
		// array so the first position is the decoded object and the second position is the outermost object.
		// if there were no objects in the versioned list passed to us, only add ourselves.
		if into != nil && into != obj {
			versioned.Objects = []runtime.Object{obj, into}
		} else {
			versioned.Objects = []runtime.Object{obj}
		}
		return versioned, actual, err
	}

	prefixLen := len(s.prefix)
	switch {
	case len(originalData) == 0:
		// TODO: treat like decoding {} from JSON with defaulting
		return nil, nil, fmt.Errorf("empty data")
	case len(originalData) < prefixLen || !bytes.Equal(s.prefix, originalData[:prefixLen]):
		return nil, nil, fmt.Errorf("provided data does not appear to be a protobuf message, expected prefix %v", s.prefix)
	case len(originalData) == prefixLen:
		// TODO: treat like decoding {} from JSON with defaulting
		return nil, nil, fmt.Errorf("empty body")
	}

	data := originalData[prefixLen:]
	unk := runtime.Unknown{}
	if err := unk.Unmarshal(data); err != nil {
		return nil, nil, err
	}

	actual := unk.GroupVersionKind()
	copyKindDefaults(&actual, gvk)

	if intoUnknown, ok := into.(*runtime.Unknown); ok && intoUnknown != nil {
		*intoUnknown = unk
		if ok, _, _ := s.RecognizesData(bytes.NewBuffer(unk.Raw)); ok {
			intoUnknown.ContentType = s.contentType
		}
		return intoUnknown, &actual, nil
	}

	if into != nil {
		types, _, err := s.typer.ObjectKinds(into)
		switch {
		case runtime.IsNotRegisteredError(err):
			pb, ok := into.(proto.Message)
			if !ok {
				return nil, &actual, errNotMarshalable{reflect.TypeOf(into)}
			}
			if err := proto.Unmarshal(unk.Raw, pb); err != nil {
				return nil, &actual, err
			}
			return into, &actual, nil
		case err != nil:
			return nil, &actual, err
		default:
			copyKindDefaults(&actual, &types[0])
			// if the result of defaulting did not set a version or group, ensure that at least group is set
			// (copyKindDefaults will not assign Group if version is already set). This guarantees that the group
			// of into is set if there is no better information from the caller or object.
			if len(actual.Version) == 0 && len(actual.Group) == 0 {
				actual.Group = types[0].Group
			}
		}
	}

	if len(actual.Kind) == 0 {
		return nil, &actual, runtime.NewMissingKindErr(fmt.Sprintf("%#v", unk.TypeMeta))
	}
	if len(actual.Version) == 0 {
		return nil, &actual, runtime.NewMissingVersionErr(fmt.Sprintf("%#v", unk.TypeMeta))
	}

	return unmarshalToObject(s.typer, s.creater, &actual, into, unk.Raw)
}
Exemplo n.º 3
0
// Encode serializes the provided object to the given writer.
func (s *Serializer) Encode(obj runtime.Object, w io.Writer) error {
	prefixSize := uint64(len(s.prefix))

	var unk runtime.Unknown
	switch t := obj.(type) {
	case *runtime.Unknown:
		estimatedSize := prefixSize + uint64(t.Size())
		data := make([]byte, estimatedSize)
		i, err := t.MarshalTo(data[prefixSize:])
		if err != nil {
			return err
		}
		copy(data, s.prefix)
		_, err = w.Write(data[:prefixSize+uint64(i)])
		return err
	default:
		kind := obj.GetObjectKind().GroupVersionKind()
		unk = runtime.Unknown{
			TypeMeta: runtime.TypeMeta{
				Kind:       kind.Kind,
				APIVersion: kind.GroupVersion().String(),
			},
		}
	}

	switch t := obj.(type) {
	case bufferedMarshaller:
		// this path performs a single allocation during write but requires the caller to implement
		// the more efficient Size and MarshalTo methods
		encodedSize := uint64(t.Size())
		estimatedSize := prefixSize + estimateUnknownSize(&unk, encodedSize)
		data := make([]byte, estimatedSize)

		i, err := unk.NestedMarshalTo(data[prefixSize:], t, encodedSize)
		if err != nil {
			return err
		}

		copy(data, s.prefix)

		_, err = w.Write(data[:prefixSize+uint64(i)])
		return err

	case proto.Marshaler:
		// this path performs extra allocations
		data, err := t.Marshal()
		if err != nil {
			return err
		}
		unk.Raw = data

		estimatedSize := prefixSize + uint64(unk.Size())
		data = make([]byte, estimatedSize)

		i, err := unk.MarshalTo(data[prefixSize:])
		if err != nil {
			return err
		}

		copy(data, s.prefix)

		_, err = w.Write(data[:prefixSize+uint64(i)])
		return err

	default:
		// TODO: marshal with a different content type and serializer (JSON for third party objects)
		return errNotMarshalable{reflect.TypeOf(obj)}
	}
}