micro-codec-json/json.go

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// Package json provides a json codec
package json
import (
"encoding/json"
"io"
"io/ioutil"
"github.com/unistack-org/micro/v3/codec"
)
type jsonCodec struct{}
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
}
return json.Marshal(b)
}
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
}
return json.Unmarshal(b, v)
}
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 {
return &jsonCodec{}
}