refactor marshalling funcs for anypb.Any

- move marshalling funcs for anypb.Any from containerd/containerd/protobuf to typeurl

Signed-off-by: Akhil Mohan <akhilerm@gmail.com>

types.go

@@ -27,6 +27,7 @@ import (
 	gogoproto "github.com/gogo/protobuf/proto"
 	"google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/reflect/protoregistry"
+	"google.golang.org/protobuf/types/known/anypb"
 )
 
 var (
@@ -196,6 +197,31 @@ func UnmarshalToByTypeURL(typeURL string, value []byte, out interface{}) error {
 	return err
 }
 
+// FromAny converts typeurl.Any to google.golang.org/protobuf/types/known/anypb.Any.
+func FromAny(from Any) *anypb.Any {
+	if from == nil {
+		return nil
+	}
+
+	if pbany, ok := from.(*anypb.Any); ok {
+		return pbany
+	}
+
+	return &anypb.Any{
+		TypeUrl: from.GetTypeUrl(),
+		Value:   from.GetValue(),
+	}
+}
+
+// MarshalAnyToProto converts an arbitrary interface to google.golang.org/protobuf/types/known/anypb.Any.
+func MarshalAnyToProto(from interface{}) (*anypb.Any, error) {
+	anyType, err := MarshalAny(from)
+	if err != nil {
+		return nil, err
+	}
+	return FromAny(anyType), nil
+}
+
 func unmarshal(typeURL string, value []byte, v interface{}) (interface{}, error) {
 	t, err := getTypeByUrl(typeURL)
 	if err != nil {

types_test.go

@@ -167,6 +167,13 @@ func TestUnmarshalToInvalid(t *testing.T) {
 	}
 }
 
+func TestFromAny(t *testing.T) {
+	actual := FromAny(nil)
+	if actual != nil {
+		t.Fatalf("expected nil, got %v", actual)
+	}
+}
+
 func TestIs(t *testing.T) {
 	clear()
 	Register(&test{}, "test")