initial import

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

json.go

@@ -0,0 +1,60 @@
+// Package json provides a json codec
+package json
+
+import (
+	"encoding/json"
+	"io"
+	"io/ioutil"
+
+	"github.com/unistack-org/micro/v3/codec"
+	jsonpb "google.golang.org/protobuf/encoding/protojson"
+	"google.golang.org/protobuf/proto"
+)
+
+type Codec struct {
+	Conn    io.ReadWriteCloser
+	Encoder *json.Encoder
+	Decoder *json.Decoder
+}
+
+func (c *Codec) ReadHeader(m *codec.Message, t codec.MessageType) error {
+	return nil
+}
+
+func (c *Codec) ReadBody(b interface{}) error {
+	if b == nil {
+		return nil
+	}
+	switch m := b.(type) {
+	case proto.Message:
+		buf, err := ioutil.ReadAll(c.Conn)
+		if err != nil {
+			return err
+		}
+		return jsonpb.Unmarshal(buf, m)
+	}
+	return c.Decoder.Decode(b)
+}
+
+func (c *Codec) Write(m *codec.Message, b interface{}) error {
+	if b == nil {
+		return nil
+	}
+	return c.Encoder.Encode(b)
+}
+
+func (c *Codec) Close() error {
+	return c.Conn.Close()
+}
+
+func (c *Codec) String() string {
+	return "json"
+}
+
+func NewCodec(c io.ReadWriteCloser) codec.Codec {
+	return &Codec{
+		Conn:    c,
+		Decoder: json.NewDecoder(c),
+		Encoder: json.NewEncoder(c),
+	}
+}