rewrite

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

proto/proto.go

@@ -0,0 +1,93 @@
+// Package proto provides a proto codec
+package proto
+
+import (
+	"io"
+	"io/ioutil"
+
+	oldproto "github.com/golang/protobuf/proto"
+	"github.com/segmentio/encoding/proto"
+	"github.com/unistack-org/micro/v3/codec"
+	newproto "google.golang.org/protobuf/proto"
+)
+
+type protoCodec struct{}
+
+func (c *protoCodec) Marshal(v interface{}) ([]byte, error) {
+	if v == nil {
+		return nil, nil
+	}
+	switch m := v.(type) {
+	case *codec.Frame:
+		return m.Data, nil
+	case newproto.Message, oldproto.Message, proto.Message:
+		return proto.Marshal(m)
+	}
+	return nil, codec.ErrInvalidMessage
+}
+
+func (c *protoCodec) Unmarshal(d []byte, v interface{}) error {
+	if d == nil || v == nil {
+		return nil
+	}
+	switch m := v.(type) {
+	case *codec.Frame:
+		m.Data = d
+	case newproto.Message, oldproto.Message, proto.Message:
+		return proto.Unmarshal(d, m)
+	}
+	return codec.ErrInvalidMessage
+}
+
+func (c *protoCodec) ReadHeader(conn io.ReadWriter, m *codec.Message, t codec.MessageType) error {
+	return nil
+}
+
+func (c *protoCodec) ReadBody(conn io.ReadWriter, b interface{}) error {
+	if b == nil {
+		return nil
+	}
+	switch m := b.(type) {
+	case *codec.Frame:
+		buf, err := ioutil.ReadAll(conn)
+		if err != nil {
+			return err
+		}
+		m.Data = buf
+		return nil
+	case oldproto.Message, newproto.Message, proto.Message:
+		buf, err := ioutil.ReadAll(conn)
+		if err != nil {
+			return err
+		}
+		return proto.Unmarshal(buf, m)
+	}
+	return codec.ErrInvalidMessage
+}
+
+func (c *protoCodec) Write(conn io.ReadWriter, m *codec.Message, b interface{}) error {
+	if b == nil {
+		return nil
+	}
+	switch m := b.(type) {
+	case *codec.Frame:
+		_, err := conn.Write(m.Data)
+		return err
+	case oldproto.Message, newproto.Message, proto.Message:
+		buf, err := proto.Marshal(m)
+		if err != nil {
+			return err
+		}
+		_, err = conn.Write(buf)
+		return err
+	}
+	return codec.ErrInvalidMessage
+}
+
+func (c *protoCodec) String() string {
+	return "proto"
+}
+
+func NewCodec() codec.Codec {
+	return &protoCodec{}
+}