forked from andeya/erpc
/
reply_error.go
153 lines (133 loc) · 3.08 KB
/
reply_error.go
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package tp
import (
"bytes"
"encoding/json"
"strconv"
"unsafe"
"github.com/tidwall/gjson"
"github.com/henrylee2cn/goutil"
"github.com/henrylee2cn/teleport/utils"
)
type (
// Rerror error only for reply packet
Rerror struct {
// Code error code
Code int32
// Message error message to the user (optional)
Message string
// Detail error's detailed reason (optional)
Detail string
}
)
var (
_ json.Marshaler = new(Rerror)
_ json.Unmarshaler = new(Rerror)
reA = []byte(`{"code":`)
reB = []byte(`,"message":"`)
reC = []byte(`,"detail":"`)
reD = []byte(`"`)
reE = []byte(`\"`)
)
// NewRerror creates a *Rerror.
func NewRerror(code int32, message, detail string) *Rerror {
return &Rerror{
Code: code,
Message: message,
Detail: detail,
}
}
// NewRerrorFromMeta creates a *Rerror from 'X-Reply-Error' metadata.
// Return nil if there is no 'X-Reply-Error' in metadata.
func NewRerrorFromMeta(meta *utils.Args) *Rerror {
b := meta.Peek(MetaRerrorKey)
if len(b) == 0 {
return nil
}
r := new(Rerror)
r.UnmarshalJSON(b)
return r
}
// String prints error info.
func (r *Rerror) String() string {
if r == nil {
return "<nil>"
}
b, _ := r.MarshalJSON()
return goutil.BytesToString(b)
}
// Copy returns the copy of Rerror
func (r Rerror) Copy() *Rerror {
return &r
}
// SetToMeta sets self to 'X-Reply-Error' metadata.
func (r *Rerror) SetToMeta(meta *utils.Args) {
b, _ := r.MarshalJSON()
if len(b) == 0 {
return
}
meta.Set(MetaRerrorKey, goutil.BytesToString(b))
}
// MarshalJSON marshals Rerror into JSON, implements json.Marshaler interface.
func (r *Rerror) MarshalJSON() ([]byte, error) {
if r == nil {
return []byte{}, nil
}
var b = append(reA, strconv.FormatInt(int64(r.Code), 10)...)
if len(r.Message) > 0 {
b = append(b, reB...)
b = append(b, bytes.Replace(goutil.StringToBytes(r.Message), reD, reE, -1)...)
b = append(b, '"')
}
if len(r.Detail) > 0 {
b = append(b, reC...)
b = append(b, bytes.Replace(goutil.StringToBytes(r.Detail), reD, reE, -1)...)
b = append(b, '"')
}
b = append(b, '}')
return b, nil
}
// UnmarshalJSON unmarshals a JSON description of self.
func (r *Rerror) UnmarshalJSON(b []byte) error {
if r == nil {
return nil
}
s := goutil.BytesToString(b)
r.Code = int32(gjson.Get(s, "code").Int())
r.Message = gjson.Get(s, "message").String()
r.Detail = gjson.Get(s, "detail").String()
return nil
}
func hasRerror(meta *utils.Args) bool {
return meta.Has(MetaRerrorKey)
}
func getRerrorBytes(meta *utils.Args) []byte {
return meta.Peek(MetaRerrorKey)
}
// ToError converts to error
func (r *Rerror) ToError() error {
if r == nil {
return nil
}
return (*rerror)(unsafe.Pointer(r))
}
// ToRerror converts error to *Rerror
func ToRerror(err error) *Rerror {
if err == nil {
return nil
}
r, ok := err.(*rerror)
if ok {
return r.toRerror()
}
rerr := rerrUnknownError.Copy()
rerr.Detail = err.Error()
return rerr
}
type rerror Rerror
func (r *rerror) Error() string {
b, _ := r.toRerror().MarshalJSON()
return goutil.BytesToString(b)
}
func (r *rerror) toRerror() *Rerror {
return (*Rerror)(unsafe.Pointer(r))
}