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context-resp.go
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context-resp.go
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package goa
import (
"bufio"
"encoding/json"
"errors"
"net"
"net/http"
"reflect"
)
const respBodyKey = "responseBody"
func (c *ContextBeforeLookup) Status() int64 {
status := reflect.ValueOf(c.ResponseWriter).Elem().FieldByName(`status`)
if status.IsValid() {
return status.Int()
} else {
return 0
}
}
func (c *ContextBeforeLookup) ResponseBodySize() int64 {
s := reflect.ValueOf(c.ResponseWriter).Elem().FieldByName(`written`)
if s.IsValid() {
return s.Int()
} else {
return 0
}
}
func (c *ContextBeforeLookup) Write(content []byte) (int, error) {
if c.data == nil {
c.data = make(map[string]interface{})
}
value := c.data[respBodyKey]
if value == nil {
body := append([]byte{}, content...)
c.data[respBodyKey] = body
} else if body, ok := value.([]byte); ok {
body = append(body, content...)
c.data[respBodyKey] = body
}
return c.ResponseWriter.Write(content)
}
func (c *ContextBeforeLookup) ResponseBody() []byte {
if data, ok := c.data[respBodyKey]; ok {
if body, ok := data.([]byte); ok {
return body
}
}
return nil
}
func (c *ContextBeforeLookup) Data(data interface{}, err error) {
statusCode := http.StatusOK
body := struct {
Code string `json:"code"`
Message string `json:"message"`
Data interface{} `json:"data,omitempty"`
}{}
if err == nil {
body.Code = `ok`
body.Message = `success`
} else {
if err2, ok := err.(interface {
Code() string
Message() string
}); ok && err2.Code() != "" {
body.Code, body.Message = err2.Code(), err2.Message()
if err3, ok := err.(interface {
GetError() error
}); ok && err3.GetError() != nil {
c.SetError(err3.GetError())
}
} else {
statusCode = http.StatusInternalServerError
body.Code, body.Message = `server-err`, `Server Error.`
c.SetError(err)
}
}
body.Data = getData(data, err, statusCode)
c.StatusJson(statusCode, body)
}
func getData(data interface{}, err error, code int) interface{} {
if err != nil && code != http.StatusInternalServerError {
if err2, ok := err.(interface {
Data() interface{}
}); ok && err2.Data() != nil {
return err2.Data()
}
}
if data != nil && !isNilValue(data) { // 避免返回"data": null
return data
}
return nil
}
func isNilValue(itfc interface{}) bool {
v := reflect.ValueOf(itfc)
switch v.Kind() {
case reflect.Ptr, reflect.Map, reflect.Slice, reflect.Interface:
return v.IsNil()
}
return false
}
func (c *ContextBeforeLookup) Ok(message string) {
body := struct {
Code string `json:"code"`
Message string `json:"message"`
}{
Code: "ok",
Message: message,
}
c.StatusJson(http.StatusOK, body)
}
func (c *ContextBeforeLookup) Json(data interface{}) {
c.StatusJson(http.StatusOK, data)
}
func (c *ContextBeforeLookup) Json2(data interface{}, err error) {
if err != nil {
c.SetError(err)
}
c.StatusJson(http.StatusOK, data)
}
func (c *ContextBeforeLookup) StatusJson(status int, data interface{}) {
// header should be set before WriteHeader or Write
c.ResponseWriter.Header().Set(`Content-Type`, `application/json; charset=utf-8`)
if v := reflect.ValueOf(c.ResponseWriter).Elem().FieldByName(`wroteHeader`); !v.IsValid() || !v.Bool() {
c.WriteHeader(status)
}
encoder := json.NewEncoder(c)
encoder.SetEscapeHTML(false)
if err := encoder.Encode(data); err != nil {
c.SetError(err)
c.Write([]byte(`{"code":"json-marshal-error","message":"json marshal error"}`))
}
}
func (c *ContextBeforeLookup) Redirect(url string) {
c.ResponseWriter.Header().Set("Location", url)
c.ResponseWriter.WriteHeader(302)
}
func (c *ContextBeforeLookup) Hijack() (net.Conn, *bufio.ReadWriter, error) {
if hijacker, ok := c.ResponseWriter.(http.Hijacker); ok {
return hijacker.Hijack()
}
return nil, nil, errors.New("the ResponseWriter doesn't support hijacking.")
}
func (c *ContextBeforeLookup) Flush() {
if flusher, ok := c.ResponseWriter.(http.Flusher); ok {
flusher.Flush()
}
}