Semconv OTLP stable HTTP metrics

pkg/middlewares/observability/status_code.go

@@ -0,0 +1,40 @@
+package observability
+
+import (
+	"bufio"
+	"net"
+	"net/http"
+)
+
+// newStatusCodeRecorder returns an initialized statusCodeRecoder.
+func newStatusCodeRecorder(rw http.ResponseWriter, status int) *statusCodeRecorder {
+	return &statusCodeRecorder{rw, status}
+}
+
+type statusCodeRecorder struct {
+	http.ResponseWriter
+	status int
+}
+
+// WriteHeader captures the status code for later retrieval.
+func (s *statusCodeRecorder) WriteHeader(status int) {
+	s.status = status
+	s.ResponseWriter.WriteHeader(status)
+}
+
+// Status get response status.
+func (s *statusCodeRecorder) Status() int {
+	return s.status
+}
+
+// Hijack hijacks the connection.
+func (s *statusCodeRecorder) Hijack() (net.Conn, *bufio.ReadWriter, error) {
+	return s.ResponseWriter.(http.Hijacker).Hijack()
+}
+
+// Flush sends any buffered data to the client.
+func (s *statusCodeRecorder) Flush() {
+	if flusher, ok := s.ResponseWriter.(http.Flusher); ok {
+		flusher.Flush()
+	}
+}