drop old proto

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

proto.go

@@ -5,8 +5,6 @@ import (
 	"io"
 	"io/ioutil"
 
-	// nolint: staticcheck
-	oldproto "github.com/golang/protobuf/proto"
 	"github.com/unistack-org/micro/v3/codec"
 	"google.golang.org/protobuf/proto"
 )
@@ -21,8 +19,6 @@ func (c *protoCodec) Marshal(v interface{}) ([]byte, error) {
 		return m.Data, nil
 	case proto.Message:
 		return proto.Marshal(m)
-	case oldproto.Message:
-		return oldproto.Marshal(m)
 	}
 	return nil, codec.ErrInvalidMessage
 }
@@ -38,8 +34,6 @@ func (c *protoCodec) Unmarshal(d []byte, v interface{}) error {
 		m.Data = d
 	case proto.Message:
 		return proto.Unmarshal(d, m)
-	case oldproto.Message:
-		return oldproto.Unmarshal(d, m)
 	}
 	return codec.ErrInvalidMessage
 }
@@ -59,12 +53,6 @@ func (c *protoCodec) ReadBody(conn io.Reader, b interface{}) error {
 		}
 		m.Data = buf
 		return nil
-	case oldproto.Message:
-		buf, err := ioutil.ReadAll(conn)
-		if err != nil {
-			return err
-		}
-		return oldproto.Unmarshal(buf, m)
 	case proto.Message:
 		buf, err := ioutil.ReadAll(conn)
 		if err != nil {
@@ -82,13 +70,6 @@ func (c *protoCodec) Write(conn io.Writer, m *codec.Message, b interface{}) erro
 	case *codec.Frame:
 		_, err := conn.Write(m.Data)
 		return err
-	case oldproto.Message:
-		buf, err := oldproto.Marshal(m)
-		if err != nil {
-			return err
-		}
-		_, err = conn.Write(buf)
-		return err
 	case proto.Message:
 		buf, err := proto.Marshal(m)
 		if err != nil {