fix flatten codec.Frame case

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

codec_test.go

@@ -3,8 +3,40 @@ package xml
 import (
 	"bytes"
 	"testing"
+
+	"github.com/unistack-org/micro/v3/codec"
 )
 
+func TestFrame(t *testing.T) {
+	s := &codec.Frame{Data: []byte("test")}
+
+	buf, err := NewCodec().Marshal(s)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(buf, []byte(`test`)) {
+		t.Fatalf("bytes not equal %s != %s", buf, `test`)
+	}
+}
+
+func TestFrameFlatten(t *testing.T) {
+	s := &struct {
+		One  string
+		Name *codec.Frame `xml:"name" codec:"flatten"`
+	}{
+		One:  "xx",
+		Name: &codec.Frame{Data: []byte("test")},
+	}
+
+	buf, err := NewCodec().Marshal(s)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(buf, []byte(`test`)) {
+		t.Fatalf("bytes not equal %s != %s", buf, `test`)
+	}
+}
+
 func TestReadBody(t *testing.T) {
 	s := &struct {
 		Name string

go.mod

@@ -2,4 +2,4 @@ module github.com/unistack-org/micro-codec-xml/v3
 
 go 1.16
 
-require github.com/unistack-org/micro/v3 v3.7.3
+require github.com/unistack-org/micro/v3 v3.7.4

go.sum

@@ -8,8 +8,8 @@ github.com/patrickmn/go-cache v2.1.0+incompatible/go.mod h1:3Qf8kWWT7OJRJbdiICTK
 github.com/silas/dag v0.0.0-20210121180416-41cf55125c34/go.mod h1:7RTUFBdIRC9nZ7/3RyRNH1bdqIShrDejd1YbLwgPS+I=
 github.com/unistack-org/micro-proto v0.0.9 h1:KrWLS4FUX7UAWNAilQf70uad6ZPf/0EudeddCXllRVc=
 github.com/unistack-org/micro-proto v0.0.9/go.mod h1:Cckwmzd89gvS7ThxzZp9kQR/EOdksFQcsTAtDDyKwrg=
-github.com/unistack-org/micro/v3 v3.7.3 h1:7dCv7WuTYp47jZ/doVCXDNMnY75imprbmwSnmchTSJY=
+github.com/unistack-org/micro/v3 v3.7.4 h1:nRk7f58v0VsiW7aKL0UQaFCQxFoursHQLoWdeZ1RYbg=
-github.com/unistack-org/micro/v3 v3.7.3/go.mod h1:78vy7ggElJD+ayx8ruhJsY+SkGUupfR32LXrg1UObvg=
+github.com/unistack-org/micro/v3 v3.7.4/go.mod h1:78vy7ggElJD+ayx8ruhJsY+SkGUupfR32LXrg1UObvg=
 golang.org/x/net v0.0.0-20210510120150-4163338589ed/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=

xml.go

@@ -20,22 +20,22 @@ const (
 )
 
 func (c *xmlCodec) Marshal(v interface{}, opts ...codec.Option) ([]byte, error) {
-	switch m := v.(type) {
+	if v == nil {
-	case nil:
 		return nil, nil
-	case *codec.Frame:
-		return m.Data, nil
 	}
 
 	options := c.opts
 	for _, o := range opts {
 		o(&options)
 	}
-
 	if nv, nerr := rutil.StructFieldByTag(v, options.TagName, flattenTag); nerr == nil {
 		v = nv
 	}
 
+	if m, ok := v.(*codec.Frame); ok {
+		return m.Data, nil
+	}
+
 	return xml.Marshal(v)
 }
 
@@ -44,11 +44,6 @@ func (c *xmlCodec) Unmarshal(b []byte, v interface{}, opts ...codec.Option) erro
 		return nil
 	}
 
-	if m, ok := v.(*codec.Frame); ok {
-		m.Data = b
-		return nil
-	}
-
 	options := c.opts
 	for _, o := range opts {
 		o(&options)
@@ -58,6 +53,11 @@ func (c *xmlCodec) Unmarshal(b []byte, v interface{}, opts ...codec.Option) erro
 		v = nv
 	}
 
+	if m, ok := v.(*codec.Frame); ok {
+		m.Data = b
+		return nil
+	}
+
 	return xml.Unmarshal(b, v)
 }