pure jsonpb codec

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

jsonpb.go

@@ -0,0 +1,95 @@
+// Package jsonpb provides a json codec
+package jsonpb
+
+import (
+	"bytes"
+	"io"
+	"io/ioutil"
+
+	oldjsonpb "github.com/golang/protobuf/jsonpb"
+	oldproto "github.com/golang/protobuf/proto"
+	"github.com/unistack-org/micro/v3/codec"
+	jsonpb "google.golang.org/protobuf/encoding/protojson"
+	"google.golang.org/protobuf/proto"
+)
+
+var (
+	JsonpbMarshaler      = &jsonpb.MarshalOptions{}
+	OldJsonpbMarshaler   = &oldjsonpb.Marshaler{}
+	JsonpbUnmarshaler    = &jsonpb.UnmarshalOptions{}
+	OldJsonpbUnmarshaler = &oldjsonpb.Unmarshaler{}
+)
+
+type jsonpbCodec struct {
+}
+
+func (c *jsonpbCodec) ReadHeader(conn io.ReadWriter, m *codec.Message, t codec.MessageType) error {
+	return nil
+}
+
+func (c *jsonpbCodec) ReadBody(conn io.ReadWriter, b interface{}) error {
+	if b == nil {
+		return nil
+	}
+	switch m := b.(type) {
+	case oldproto.Message:
+		return OldJsonpbUnmarshaler.Unmarshal(conn, m)
+	case proto.Message:
+		buf, err := ioutil.ReadAll(conn)
+		if err != nil {
+			return err
+		}
+		return JsonpbUnmarshaler.Unmarshal(buf, m)
+	}
+	return codec.ErrInvalidMessage
+}
+
+func (c *jsonpbCodec) Write(conn io.ReadWriter, m *codec.Message, b interface{}) error {
+	if b == nil {
+		return nil
+	}
+	switch m := b.(type) {
+	case oldproto.Message:
+		return OldJsonpbMarshaler.Marshal(conn, m)
+	case proto.Message:
+		buf, err := JsonpbMarshaler.Marshal(m)
+		if err != nil {
+			return err
+		}
+		_, err = conn.Write(buf)
+		return err
+	}
+	return codec.ErrInvalidMessage
+}
+
+func (c *jsonpbCodec) String() string {
+	return "jsonpb"
+}
+
+func NewCodec() codec.Codec {
+	return &jsonpbCodec{}
+}
+
+func (c *jsonpbCodec) Marshal(v interface{}) ([]byte, error) {
+	switch m := v.(type) {
+	case proto.Message:
+		return JsonpbMarshaler.Marshal(m)
+	case oldproto.Message:
+		buf, err := OldJsonpbMarshaler.MarshalToString(m)
+		return []byte(buf), err
+	}
+	return nil, codec.ErrInvalidMessage
+}
+
+func (c *jsonpbCodec) Unmarshal(d []byte, v interface{}) error {
+	if d == nil {
+		return nil
+	}
+	switch m := v.(type) {
+	case proto.Message:
+		return JsonpbUnmarshaler.Unmarshal(d, m)
+	case oldproto.Message:
+		return OldJsonpbUnmarshaler.Unmarshal(bytes.NewReader(d), m)
+	}
+	return codec.ErrInvalidMessage
+}