gin/render/reader.go
田欧 d510595aa5 chore: add some annotations (#1544)
ref: #1075 
because I am not a native English, maybe have a bit problem.
2018-09-15 10:23:32 +08:00

44 lines
1.1 KiB
Go

// Copyright 2018 Gin Core Team. All rights reserved.
// Use of this source code is governed by a MIT style
// license that can be found in the LICENSE file.
package render
import (
"io"
"net/http"
"strconv"
)
// Reader contains the IO reader and its length, and custom ContentType and other headers.
type Reader struct {
ContentType string
ContentLength int64
Reader io.Reader
Headers map[string]string
}
// Render (Reader) writes data with custom ContentType and headers.
func (r Reader) Render(w http.ResponseWriter) (err error) {
r.WriteContentType(w)
r.Headers["Content-Length"] = strconv.FormatInt(r.ContentLength, 10)
r.writeHeaders(w, r.Headers)
_, err = io.Copy(w, r.Reader)
return
}
// WriteContentType (Reader) writes custom ContentType.
func (r Reader) WriteContentType(w http.ResponseWriter) {
writeContentType(w, []string{r.ContentType})
}
// writeHeaders writes custom Header.
func (r Reader) writeHeaders(w http.ResponseWriter, headers map[string]string) {
header := w.Header()
for k, v := range headers {
if val := header[k]; len(val) == 0 {
header[k] = []string{v}
}
}
}