116 lines
2.4 KiB
Go
116 lines
2.4 KiB
Go
|
// Copyright 2014 Manu Martinez-Almeida. All rights reserved.
|
||
|
|
// Use of this source code is governed by a MIT style
|
||
|
|
// license that can be found in the LICENSE file.
|
||
|
|
|
||
|
|
package gin
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bufio"
|
||
|
|
"io"
|
||
|
|
"net"
|
||
|
|
"net/http"
|
||
|
|
)
|
||
|
|
|
||
|
|
const (
|
||
|
|
noWritten = -1
|
||
|
|
defaultStatus = http.StatusOK
|
||
|
|
)
|
||
|
|
|
||
|
|
type responseWriterBase interface {
|
||
|
|
http.ResponseWriter
|
||
|
|
http.Hijacker
|
||
|
|
http.Flusher
|
||
|
|
http.CloseNotifier
|
||
|
|
|
||
|
|
// Returns the HTTP response status code of the current request.
|
||
|
|
Status() int
|
||
|
|
|
||
|
|
// Returns the number of bytes already written into the response http body.
|
||
|
|
// See Written()
|
||
|
|
Size() int
|
||
|
|
|
||
|
|
// Writes the string into the response body.
|
||
|
|
WriteString(string) (int, error)
|
||
|
|
|
||
|
|
// Returns true if the response body was already written.
|
||
|
|
Written() bool
|
||
|
|
|
||
|
|
// Forces to write the http header (status code + headers).
|
||
|
|
WriteHeaderNow()
|
||
|
|
}
|
||
|
|
|
||
|
|
type responseWriter struct {
|
||
|
|
http.ResponseWriter
|
||
|
|
size int
|
||
|
|
status int
|
||
|
|
}
|
||
|
|
|
||
|
|
var _ ResponseWriter = &responseWriter{}
|
||
|
|
|
||
|
|
func (w *responseWriter) reset(writer http.ResponseWriter) {
|
||
|
|
w.ResponseWriter = writer
|
||
|
|
w.size = noWritten
|
||
|
|
w.status = defaultStatus
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *responseWriter) WriteHeader(code int) {
|
||
|
|
if code > 0 && w.status != code {
|
||
|
|
if w.Written() {
|
||
|
|
debugPrint("[WARNING] Headers were already written. Wanted to override status code %d with %d", w.status, code)
|
||
|
|
}
|
||
|
|
w.status = code
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *responseWriter) WriteHeaderNow() {
|
||
|
|
if !w.Written() {
|
||
|
|
w.size = 0
|
||
|
|
w.ResponseWriter.WriteHeader(w.status)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *responseWriter) Write(data []byte) (n int, err error) {
|
||
|
|
w.WriteHeaderNow()
|
||
|
|
n, err = w.ResponseWriter.Write(data)
|
||
|
|
w.size += n
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *responseWriter) WriteString(s string) (n int, err error) {
|
||
|
|
w.WriteHeaderNow()
|
||
|
|
n, err = io.WriteString(w.ResponseWriter, s)
|
||
|
|
w.size += n
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *responseWriter) Status() int {
|
||
|
|
return w.status
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *responseWriter) Size() int {
|
||
|
|
return w.size
|
||
|
|
}
|
||
|
|
|
||
|
|
func (w *responseWriter) Written() bool {
|
||
|
|
return w.size != noWritten
|
||
|
|
}
|
||
|
|
|
||
|
|
// Hijack implements the http.Hijacker interface.
|
||
|
|
func (w *responseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
|
||
|
|
if w.size < 0 {
|
||
|
|
w.size = 0
|
||
|
|
}
|
||
|
|
return w.ResponseWriter.(http.Hijacker).Hijack()
|
||
|
|
}
|
||
|
|
|
||
|
|
// CloseNotify implements the http.CloseNotify interface.
|
||
|
|
func (w *responseWriter) CloseNotify() <-chan bool {
|
||
|
|
return w.ResponseWriter.(http.CloseNotifier).CloseNotify()
|
||
|
|
}
|
||
|
|
|
||
|
|
// Flush implements the http.Flush interface.
|
||
|
|
func (w *responseWriter) Flush() {
|
||
|
|
w.WriteHeaderNow()
|
||
|
|
w.ResponseWriter.(http.Flusher).Flush()
|
||
|
|
}
|