traefik/pkg/middlewares/metrics/recorder.go

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package metrics
import (
"bufio"
"net"
"net/http"
)
type recorder interface {
http.ResponseWriter
http.Flusher
getCode() int
}
func newResponseRecorder(rw http.ResponseWriter) recorder {
rec := &responseRecorder{
ResponseWriter: rw,
statusCode: http.StatusOK,
}
if _, ok := rw.(http.CloseNotifier); !ok {
return rec
}
return responseRecorderWithCloseNotify{rec}
}
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// responseRecorder captures information from the response and preserves it for
// later analysis.
type responseRecorder struct {
http.ResponseWriter
statusCode int
}
type responseRecorderWithCloseNotify struct {
*responseRecorder
}
// CloseNotify returns a channel that receives at most a
// single value (true) when the client connection has gone away.
func (r *responseRecorderWithCloseNotify) CloseNotify() <-chan bool {
return r.ResponseWriter.(http.CloseNotifier).CloseNotify()
}
func (r *responseRecorder) getCode() int {
return r.statusCode
}
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// WriteHeader captures the status code for later retrieval.
func (r *responseRecorder) WriteHeader(status int) {
r.ResponseWriter.WriteHeader(status)
r.statusCode = status
}
// Hijack hijacks the connection
func (r *responseRecorder) Hijack() (net.Conn, *bufio.ReadWriter, error) {
return r.ResponseWriter.(http.Hijacker).Hijack()
}
// CloseNotify returns a channel that receives at most a
// single value (true) when the client connection has gone
// away.
func (r *responseRecorder) CloseNotify() <-chan bool {
return r.ResponseWriter.(http.CloseNotifier).CloseNotify()
}
// Flush sends any buffered data to the client.
func (r *responseRecorder) Flush() {
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if f, ok := r.ResponseWriter.(http.Flusher); ok {
f.Flush()
}
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}