[#276] Merge repo with frostfs-api-go

Signed-off-by: Pavel Pogodaev <p.pogodaev@yadro.com>

api/util/proto/encoding/proto.go

@@ -0,0 +1,57 @@
+package encoding
+
+import (
+	"fmt"
+
+	"google.golang.org/grpc/encoding"
+	"google.golang.org/protobuf/proto"
+)
+
+// ProtoCodec is easyproto codec used for code generated by protogen.
+// It is binary-level compatible with the standard proto codec, thus uses the same name.
+type ProtoCodec struct{}
+
+// ProtoMarshaler is an interface accepted by ProtoCodec.Marshal.
+type ProtoMarshaler interface {
+	MarshalProtobuf([]byte) []byte
+}
+
+// ProtoUnmarshaler is an interface accepted by ProtoCodec.Unmarshal.
+type ProtoUnmarshaler interface {
+	UnmarshalProtobuf([]byte) error
+}
+
+var _ encoding.Codec = ProtoCodec{}
+
+func init() {
+	encoding.RegisterCodec(ProtoCodec{})
+}
+
+// Name implements the encoding.Codec interface.
+func (ProtoCodec) Name() string { return "proto" }
+
+// Marshal implements the encoding.Codec interface.
+func (ProtoCodec) Marshal(v any) ([]byte, error) {
+	switch v := v.(type) {
+	case ProtoMarshaler:
+		return v.MarshalProtobuf(nil), nil
+	default:
+		if v := messageV2Of(v); v != nil {
+			return proto.Marshal(v)
+		}
+		return nil, fmt.Errorf("failed to marshal, message is %T, want proto.Message", v)
+	}
+}
+
+// Unmarshal implements the encoding.Codec interface.
+func (ProtoCodec) Unmarshal(data []byte, v any) error {
+	switch v := v.(type) {
+	case ProtoUnmarshaler:
+		return v.UnmarshalProtobuf(data)
+	default:
+		if v := messageV2Of(v); v != nil {
+			return proto.Unmarshal(data, v)
+		}
+		return fmt.Errorf("failed to unmarshal, message is %T, want proto.Message", v)
+	}
+}