rewrite

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

json/json.go

@@ -0,0 +1,153 @@
+// Package json provides a json codec
+package json
+
+import (
+	"io"
+	"io/ioutil"
+
+	"github.com/segmentio/encoding/json"
+	"github.com/unistack-org/micro/v3/codec"
+)
+
+var (
+	JsonMarshaler = &Marshaler{}
+
+	JsonUnmarshaler = &Unmarshaler{
+		ZeroCopy: true,
+	}
+)
+
+type Marshaler struct {
+	EscapeHTML      bool
+	SortMapKeys     bool
+	TrustRawMessage bool
+}
+
+type Unmarshaler struct {
+	DisallowUnknownFields                bool
+	DontCopyNumber                       bool
+	DontCopyRawMessage                   bool
+	DontCopyString                       bool
+	DontMatchCaseInsensitiveStructFields bool
+	UseNumber                            bool
+	ZeroCopy                             bool
+}
+
+type jsonCodec struct {
+	encodeFlags json.AppendFlags
+	decodeFlags json.ParseFlags
+}
+
+func (c *jsonCodec) Marshal(b interface{}) ([]byte, error) {
+	if b == nil {
+		return nil, nil
+	}
+	switch m := b.(type) {
+	case *codec.Frame:
+		return m.Data, nil
+	}
+
+	var err error
+	var buf []byte
+	buf, err = json.Append(buf, b, c.encodeFlags)
+	return buf, err
+}
+
+func (c *jsonCodec) Unmarshal(b []byte, v interface{}) error {
+	if b == nil || v == nil {
+		return nil
+	}
+	switch m := v.(type) {
+	case *codec.Frame:
+		m.Data = b
+		return nil
+	}
+
+	_, err := json.Parse(b, v, c.decodeFlags)
+	return err
+}
+
+func (c *jsonCodec) ReadHeader(conn io.ReadWriter, m *codec.Message, t codec.MessageType) error {
+	return nil
+}
+
+func (c *jsonCodec) 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
+	}
+
+	return json.NewDecoder(conn).Decode(b)
+}
+
+func (c *jsonCodec) 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
+	}
+
+	return json.NewEncoder(conn).Encode(b)
+}
+
+func (c *jsonCodec) String() string {
+	return "json"
+}
+
+func NewCodec() codec.Codec {
+	var encodeFlags json.AppendFlags
+	var decodeFlags json.ParseFlags
+
+	if JsonMarshaler.EscapeHTML {
+		encodeFlags |= json.EscapeHTML
+	}
+
+	if JsonMarshaler.SortMapKeys {
+		encodeFlags |= json.SortMapKeys
+	}
+
+	if JsonMarshaler.TrustRawMessage {
+		encodeFlags |= json.TrustRawMessage
+	}
+
+	if JsonUnmarshaler.DisallowUnknownFields {
+		decodeFlags |= json.DisallowUnknownFields
+	}
+
+	if JsonUnmarshaler.DontCopyNumber {
+		decodeFlags |= json.DontCopyNumber
+	}
+
+	if JsonUnmarshaler.DontCopyRawMessage {
+		decodeFlags |= json.DontCopyRawMessage
+	}
+
+	if JsonUnmarshaler.DontCopyString {
+		decodeFlags |= json.DontCopyString
+	}
+
+	if JsonUnmarshaler.DontMatchCaseInsensitiveStructFields {
+		decodeFlags |= json.DontMatchCaseInsensitiveStructFields
+	}
+
+	if JsonUnmarshaler.UseNumber {
+		decodeFlags |= json.UseNumber
+	}
+
+	if JsonUnmarshaler.ZeroCopy {
+		decodeFlags |= json.ZeroCopy
+	}
+
+	return &jsonCodec{encodeFlags: encodeFlags, decodeFlags: decodeFlags}
+}