114 lines
2.0 KiB
Go
114 lines
2.0 KiB
Go
// Package json provides a json codec
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package json
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import (
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"encoding/json"
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"io"
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"github.com/unistack-org/micro/v3/codec"
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rutil "github.com/unistack-org/micro/v3/util/reflect"
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)
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type jsonCodec struct{}
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const (
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flattenTag = "flatten"
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)
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func (c *jsonCodec) Marshal(v interface{}) ([]byte, error) {
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switch m := v.(type) {
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case nil:
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return nil, nil
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case *codec.Frame:
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return m.Data, nil
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}
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if nv, err := rutil.StructFieldByTag(v, codec.DefaultTagName, flattenTag); err == nil {
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v = nv
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}
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return json.Marshal(v)
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}
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func (c *jsonCodec) Unmarshal(b []byte, v interface{}) error {
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if len(b) == 0 {
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return nil
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}
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switch m := v.(type) {
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case nil:
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return nil
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case *codec.Frame:
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m.Data = b
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return nil
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}
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if nv, err := rutil.StructFieldByTag(v, codec.DefaultTagName, flattenTag); err == nil {
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v = nv
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}
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return json.Unmarshal(b, v)
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}
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func (c *jsonCodec) ReadHeader(conn io.Reader, m *codec.Message, t codec.MessageType) error {
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return nil
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}
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func (c *jsonCodec) ReadBody(conn io.Reader, v interface{}) error {
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switch m := v.(type) {
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case nil:
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return nil
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case *codec.Frame:
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buf, err := io.ReadAll(conn)
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if err != nil {
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return err
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} else if len(buf) == 0 {
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return nil
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}
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m.Data = buf
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return nil
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}
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buf, err := io.ReadAll(conn)
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if err != nil {
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return err
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} else if len(buf) == 0 {
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return nil
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}
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if nv, nerr := rutil.StructFieldByTag(v, codec.DefaultTagName, flattenTag); nerr == nil {
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v = nv
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}
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return c.Unmarshal(buf, v)
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}
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func (c *jsonCodec) Write(conn io.Writer, m *codec.Message, v interface{}) error {
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switch m := v.(type) {
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case nil:
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return nil
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case *codec.Frame:
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_, err := conn.Write(m.Data)
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return err
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}
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if nv, nerr := rutil.StructFieldByTag(v, codec.DefaultTagName, flattenTag); nerr == nil {
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v = nv
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}
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buf, err := c.Marshal(v)
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if err != nil {
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return err
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}
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_, err = conn.Write(buf)
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return err
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}
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func (c *jsonCodec) String() string {
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return "json"
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}
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func NewCodec() codec.Codec {
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return &jsonCodec{}
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}
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