add transport codec

transport/codec/noop/noop.go

@@ -0,0 +1,35 @@
+package noop
+
+import (
+	"errors"
+
+	"github.com/micro/go-micro/transport"
+	"github.com/micro/go-micro/transport/codec"
+)
+
+type noopCodec struct{}
+
+func (n noopCodec) Marshal(v interface{}) ([]byte, error) {
+	msg, ok := v.(*transport.Message)
+	if !ok {
+		return nil, errors.New("invalid message")
+	}
+	return msg.Body, nil
+}
+
+func (n noopCodec) Unmarshal(d []byte, v interface{}) error {
+	msg, ok := v.(*transport.Message)
+	if !ok {
+		return errors.New("invalid message")
+	}
+	msg.Body = d
+	return nil
+}
+
+func (n noopCodec) String() string {
+	return "noop"
+}
+
+func NewCodec() codec.Codec {
+	return noopCodec{}
+}