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package air
import (
"reflect"
jsoniter "github.com/json-iterator/go"
"github.com/pkg/errors"
)
var (
ErrorMustBePointer = errors.New("value must be a pointer")
ErrorWrongRequestType = errors.New("value must be a string/[]byte/struct")
ErrorWrongResponseType = errors.New("value must be a pointer of string/[]byte/struct")
)
var json = jsoniter.ConfigCompatibleWithStandardLibrary
type Codec interface {
Encode(v interface{}) (msg []byte, err error)
Decode(reply []byte, r interface{}) (err error)
}
type DefaultCodec struct {
}
func NewDefaultCodec() Codec {
return &DefaultCodec{}
}
func (c *DefaultCodec) Encode(v interface{}) (msg []byte, err error) {
rf := reflect.ValueOf(v)
switch rf.Kind() {
case reflect.String:
msg = []byte(v.(string))
case reflect.Slice:
if rf.Type().String() == "[]uint8" {
msg = v.([]byte)
} else {
return nil, errors.WithStack(ErrorWrongRequestType)
}
case reflect.Ptr:
if rf.Elem().Kind() != reflect.Struct {
return nil, errors.WithStack(ErrorWrongRequestType)
}
fallthrough
case reflect.Struct, reflect.Map:
msg, err = json.Marshal(v)
if err != nil {
return nil, errors.Wrap(err, "convert request to json failed")
}
default:
return nil, errors.WithStack(ErrorWrongRequestType)
}
return
}
func (c *DefaultCodec) Decode(reply []byte, r interface{}) (err error) {
rv := reflect.ValueOf(r)
if rv.Kind() != reflect.Ptr || rv.IsNil() {
return ErrorMustBePointer
}
rval := rv.Elem()
kind := rval.Kind()
switch kind {
case reflect.String:
rval.SetString(string(reply))
case reflect.Slice:
if rval.Type().String() == "[]uint8" {
rval.SetBytes(reply)
} else {
return errors.WithStack(ErrorWrongResponseType)
}
case reflect.Struct:
err = json.Unmarshal(reply, r)
if err != nil {
return errors.Wrap(err, "convert response to json failed")
}
default:
return errors.WithStack(ErrorWrongResponseType)
}
return
}
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