simplify

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

go.mod

@@ -2,10 +2,8 @@ module github.com/unistack-org/micro-codec-segmentio/v3
 
 go 1.16
 
-//	github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c
-
 require (
 	github.com/segmentio/encoding v0.2.17
-	github.com/unistack-org/micro/v3 v3.3.17
+	github.com/unistack-org/micro/v3 v3.3.19
 	google.golang.org/protobuf v1.26.0
 )

go.sum

@@ -11,9 +11,9 @@ github.com/patrickmn/go-cache v2.1.0+incompatible/go.mod h1:3Qf8kWWT7OJRJbdiICTK
 github.com/segmentio/encoding v0.2.17 h1:cgfmPc44u1po1lz5bSgF00gLCROBjDNc7h+H7I20zpc=
 github.com/segmentio/encoding v0.2.17/go.mod h1:7E68jTSWMnNoYhHi1JbLd7NBSB6XfE4vzqhR88hDBQc=
 github.com/silas/dag v0.0.0-20210121180416-41cf55125c34/go.mod h1:7RTUFBdIRC9nZ7/3RyRNH1bdqIShrDejd1YbLwgPS+I=
-github.com/unistack-org/micro/v3 v3.3.17 h1:WcyS7InP0DlS/JpRQGLh5sG6VstkdHJbgpMp+gmHmwg=
+github.com/unistack-org/micro/v3 v3.3.19 h1:x0bl4H+IZvdHHKfA8qMcox9W92+e7rtbqgRfQPoP79w=
-github.com/unistack-org/micro/v3 v3.3.17/go.mod h1:022EOEZZ789hZY3yB5ZSMXU6jLiadBgcNB/cpediV3c=
+github.com/unistack-org/micro/v3 v3.3.19/go.mod h1:LXmPfbJnJNvL0kQs8HfnkV3Wya2Wb+C7keVq++RCZnk=
-golang.org/x/net v0.0.0-20210423184538-5f58ad60dda6/go.mod h1:OJAsFXCWl8Ukc7SiCT/9KSuxbyM7479/AVlXFRxuMCk=
+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=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=

json/json.go

@@ -3,10 +3,10 @@ package json
 
 import (
 	"io"
-	"io/ioutil"
 
 	"github.com/segmentio/encoding/json"
 	"github.com/unistack-org/micro/v3/codec"
+	rutil "github.com/unistack-org/micro/v3/util/reflect"
 )
 
 var (
@@ -17,6 +17,10 @@ var (
 	}
 )
 
+const (
+	flattenTag = "flatten"
+)
+
 type Marshaler struct {
 	EscapeHTML      bool
 	SortMapKeys     bool
@@ -38,17 +42,21 @@ type jsonCodec struct {
 	decodeFlags json.ParseFlags
 }
 
-func (c *jsonCodec) Marshal(b interface{}) ([]byte, error) {
+func (c *jsonCodec) Marshal(v interface{}) ([]byte, error) {
-	switch m := b.(type) {
+	switch m := v.(type) {
 	case nil:
 		return nil, nil
 	case *codec.Frame:
 		return m.Data, nil
 	}
 
+	if nv, nerr := rutil.StructFieldByTag(v, codec.DefaultTagName, flattenTag); nerr == nil {
+		v = nv
+	}
+
 	var err error
 	var buf []byte
-	buf, err = json.Append(buf, b, c.encodeFlags)
+	buf, err = json.Append(buf, v, c.encodeFlags)
 	return buf, err
 }
 
@@ -64,6 +72,9 @@ func (c *jsonCodec) Unmarshal(b []byte, v interface{}) error {
 		return nil
 	}
 
+	if nv, nerr := rutil.StructFieldByTag(v, codec.DefaultTagName, flattenTag); nerr == nil {
+		v = nv
+	}
 	_, err := json.Parse(b, v, c.decodeFlags)
 	return err
 }
@@ -72,38 +83,34 @@ func (c *jsonCodec) ReadHeader(conn io.Reader, m *codec.Message, t codec.Message
 	return nil
 }
 
-func (c *jsonCodec) ReadBody(conn io.Reader, b interface{}) error {
+func (c *jsonCodec) ReadBody(conn io.Reader, v interface{}) error {
-	switch m := b.(type) {
+	if v == nil {
-	case nil:
-		return nil
-	case *codec.Frame:
-		buf, err := ioutil.ReadAll(conn)
-		if err != nil {
-			return err
-		} else if len(buf) == 0 {
-			return nil
-		}
-		m.Data = buf
 		return nil
 	}
 
-	err := json.NewDecoder(conn).Decode(b)
+	buf, err := io.ReadAll(conn)
-	if err == io.EOF {
+	if err != nil {
+		return err
+	} else if len(buf) == 0 {
 		return nil
 	}
-	return err
+	return c.Unmarshal(buf, v)
 }
 
-func (c *jsonCodec) Write(conn io.Writer, m *codec.Message, b interface{}) error {
+func (c *jsonCodec) Write(conn io.Writer, m *codec.Message, v interface{}) error {
-	switch m := b.(type) {
+	if v == nil {
-	case nil:
 		return nil
-	case *codec.Frame:
-		_, err := conn.Write(m.Data)
-		return err
 	}
 
-	return json.NewEncoder(conn).Encode(b)
+	buf, err := c.Marshal(v)
+	if err != nil {
+		return err
+	} else if len(buf) == 0 {
+		return codec.ErrInvalidMessage
+	}
+
+	_, err = conn.Write(buf)
+	return err
 }
 
 func (c *jsonCodec) String() string {

proto/proto.go

@@ -3,15 +3,19 @@ package proto
 
 import (
 	"io"
-	"io/ioutil"
 
 	"github.com/segmentio/encoding/proto"
 	"github.com/unistack-org/micro/v3/codec"
+	rutil "github.com/unistack-org/micro/v3/util/reflect"
 	newproto "google.golang.org/protobuf/proto"
 )
 
 type protoCodec struct{}
 
+const (
+	flattenTag = "flatten"
+)
+
 func (c *protoCodec) Marshal(v interface{}) ([]byte, error) {
 	switch m := v.(type) {
 	case nil:
@@ -19,13 +23,19 @@ func (c *protoCodec) Marshal(v interface{}) ([]byte, error) {
 	case *codec.Frame:
 		return m.Data, nil
 	case newproto.Message, proto.Message:
+		if nv, nerr := rutil.StructFieldByTag(v, codec.DefaultTagName, flattenTag); nerr == nil {
+			if nm, ok := nv.(newproto.Message); ok {
+				m = nm
+			} else if nm, ok := nv.(proto.Message); ok {
+				m = nm
+			}
+		}
 		return proto.Marshal(m)
 	}
 	return nil, codec.ErrInvalidMessage
 }
 
 func (c *protoCodec) Unmarshal(d []byte, v interface{}) error {
-	var err error
 	if d == nil {
 		return nil
 	}
@@ -34,59 +44,51 @@ func (c *protoCodec) Unmarshal(d []byte, v interface{}) error {
 		return nil
 	case *codec.Frame:
 		m.Data = d
+		return nil
 	case newproto.Message, proto.Message:
-		err = proto.Unmarshal(d, m)
+		if nv, nerr := rutil.StructFieldByTag(v, codec.DefaultTagName, flattenTag); nerr == nil {
-	default:
+			if nm, ok := nv.(newproto.Message); ok {
-		err = codec.ErrInvalidMessage
+				m = nm
+			} else if nm, ok := nv.(proto.Message); ok {
+				m = nm
+			}
+		}
+		return proto.Unmarshal(d, m)
 	}
-	return err
+	return codec.ErrInvalidMessage
 }
 
 func (c *protoCodec) ReadHeader(conn io.Reader, m *codec.Message, t codec.MessageType) error {
 	return nil
 }
 
-func (c *protoCodec) ReadBody(conn io.Reader, b interface{}) error {
+func (c *protoCodec) ReadBody(conn io.Reader, v interface{}) error {
-	switch m := b.(type) {
+	if v == nil {
-	case nil:
 		return nil
-	case *codec.Frame:
-		buf, err := ioutil.ReadAll(conn)
-		if err != nil {
-			return err
-		} else if len(buf) == 0 {
-			return nil
-		}
-		m.Data = buf
-		return nil
-	case newproto.Message, proto.Message:
-		buf, err := ioutil.ReadAll(conn)
-		if err != nil {
-			return err
-		} else if len(buf) == 0 {
-			return nil
-		}
-		return proto.Unmarshal(buf, m)
 	}
-	return codec.ErrInvalidMessage
+	buf, err := io.ReadAll(conn)
+	if err != nil {
+		return err
+	} else if len(buf) == 0 {
+		return nil
+	}
+	return c.Unmarshal(buf, v)
 }
 
-func (c *protoCodec) Write(conn io.Writer, m *codec.Message, b interface{}) error {
+func (c *protoCodec) Write(conn io.Writer, m *codec.Message, v interface{}) error {
-	switch m := b.(type) {
+	if v == nil {
-	case nil:
 		return nil
-	case *codec.Frame:
-		_, err := conn.Write(m.Data)
-		return err
-	case newproto.Message, proto.Message:
-		buf, err := proto.Marshal(m)
-		if err != nil {
-			return err
-		}
-		_, err = conn.Write(buf)
-		return err
 	}
-	return codec.ErrInvalidMessage
+
+	buf, err := c.Marshal(v)
+	if err != nil {
+		return err
+	} else if len(buf) == 0 {
+		return codec.ErrInvalidMessage
+	}
+
+	_, err = conn.Write(buf)
+	return err
 }
 
 func (c *protoCodec) String() string {