traefik/middlewares/accesslog/capture_response_writer.go

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package accesslog
import (
"bufio"
"fmt"
"net"
"net/http"
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"github.com/containous/traefik/old/middlewares"
)
var (
_ middlewares.Stateful = &captureResponseWriter{}
)
// captureResponseWriter is a wrapper of type http.ResponseWriter
// that tracks request status and size
type captureResponseWriter struct {
rw http.ResponseWriter
status int
size int64
}
func (crw *captureResponseWriter) Header() http.Header {
return crw.rw.Header()
}
func (crw *captureResponseWriter) Write(b []byte) (int, error) {
if crw.status == 0 {
crw.status = http.StatusOK
}
size, err := crw.rw.Write(b)
crw.size += int64(size)
return size, err
}
func (crw *captureResponseWriter) WriteHeader(s int) {
crw.rw.WriteHeader(s)
crw.status = s
}
func (crw *captureResponseWriter) Flush() {
if f, ok := crw.rw.(http.Flusher); ok {
f.Flush()
}
}
func (crw *captureResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
if h, ok := crw.rw.(http.Hijacker); ok {
return h.Hijack()
}
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return nil, nil, fmt.Errorf("not a hijacker: %T", crw.rw)
}
func (crw *captureResponseWriter) CloseNotify() <-chan bool {
if c, ok := crw.rw.(http.CloseNotifier); ok {
return c.CloseNotify()
}
return nil
}
func (crw *captureResponseWriter) Status() int {
return crw.status
}
func (crw *captureResponseWriter) Size() int64 {
return crw.size
}