162 lines
3.0 KiB
Go
162 lines
3.0 KiB
Go
// Package json provides a json codec
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package json // import "go.unistack.org/micro-codec-json/v3"
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import (
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"bytes"
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"encoding/json"
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"io"
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"go.unistack.org/micro/v3/codec"
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rutil "go.unistack.org/micro/v3/util/reflect"
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)
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var (
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DefaultMarshalOptions = JsonMarshalOptions{
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EscapeHTML: true,
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}
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DefaultUnmarshalOptions = JsonUnmarshalOptions{
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DisallowUnknownFields: false,
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UseNumber: false,
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}
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)
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type JsonMarshalOptions struct {
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EscapeHTML bool
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}
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type JsonUnmarshalOptions struct {
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DisallowUnknownFields bool
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UseNumber bool
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}
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type jsonCodec struct {
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opts codec.Options
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}
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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{}, opts ...codec.Option) ([]byte, error) {
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if v == nil {
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return nil, nil
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}
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options := c.opts
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for _, o := range opts {
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o(&options)
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}
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if nv, err := rutil.StructFieldByTag(v, options.TagName, flattenTag); err == nil {
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v = nv
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}
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if m, ok := v.(*codec.Frame); ok {
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return m.Data, nil
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}
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marshalOptions := DefaultMarshalOptions
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if options.Context != nil {
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if f, ok := options.Context.Value(marshalOptionsKey{}).(JsonMarshalOptions); ok {
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marshalOptions = f
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}
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}
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if !marshalOptions.EscapeHTML {
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w := bytes.NewBuffer(nil)
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enc := json.NewEncoder(w)
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enc.SetEscapeHTML(marshalOptions.EscapeHTML)
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err := enc.Encode(v)
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buf := w.Bytes()
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return buf[:len(buf)-1], err
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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{}, opts ...codec.Option) error {
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if len(b) == 0 || v == nil {
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return nil
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}
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options := c.opts
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for _, o := range opts {
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o(&options)
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}
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if nv, err := rutil.StructFieldByTag(v, options.TagName, flattenTag); err == nil {
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v = nv
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}
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if m, ok := v.(*codec.Frame); ok {
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m.Data = b
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return nil
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}
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unmarshalOptions := DefaultUnmarshalOptions
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if options.Context != nil {
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if f, ok := options.Context.Value(unmarshalOptionsKey{}).(JsonUnmarshalOptions); ok {
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unmarshalOptions = f
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}
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}
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if unmarshalOptions.DisallowUnknownFields || unmarshalOptions.UseNumber {
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dec := json.NewDecoder(bytes.NewBuffer(b))
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if unmarshalOptions.DisallowUnknownFields {
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dec.DisallowUnknownFields()
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}
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if unmarshalOptions.UseNumber {
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dec.UseNumber()
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}
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return dec.Decode(v)
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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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if v == nil {
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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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if v == nil {
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return nil
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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(opts ...codec.Option) codec.Codec {
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return &jsonCodec{opts: codec.NewOptions(opts...)}
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}
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