Merge pull request 'add proto codec.Frame support' (#94) from proto-frame into v3

Reviewed-on: #94

xml.go

@@ -5,6 +5,7 @@ import (
 	"encoding/xml"
 	"io"
 
+	pb "go.unistack.org/micro-proto/v3/codec"
 	"go.unistack.org/micro/v3/codec"
 	rutil "go.unistack.org/micro/v3/util/reflect"
 )
@@ -32,7 +33,10 @@ func (c *xmlCodec) Marshal(v interface{}, opts ...codec.Option) ([]byte, error)
 		v = nv
 	}
 
-	if m, ok := v.(*codec.Frame); ok {
+	switch m := v.(type) {
+	case *codec.Frame:
+		return m.Data, nil
+	case *pb.Frame:
 		return m.Data, nil
 	}
 
@@ -53,7 +57,11 @@ func (c *xmlCodec) Unmarshal(b []byte, v interface{}, opts ...codec.Option) erro
 		v = nv
 	}
 
-	if m, ok := v.(*codec.Frame); ok {
+	switch m := v.(type) {
+	case *codec.Frame:
+		m.Data = b
+		return nil
+	case *pb.Frame:
 		m.Data = b
 		return nil
 	}