Use map to check whether stack trace is needed

Signed-off-by: Ted Yu <yute@vmware.com>

pkg/kubelet/server/server.go

@@ -835,19 +835,19 @@ func isLongRunningRequest(path string) bool {
 	return false
 }
 
+var statusesNoTracePred = httplog.StatusIsNot(
+	http.StatusOK,
+	http.StatusFound,
+	http.StatusMovedPermanently,
+	http.StatusTemporaryRedirect,
+	http.StatusBadRequest,
+	http.StatusNotFound,
+	http.StatusSwitchingProtocols,
+)
+
 // ServeHTTP responds to HTTP requests on the Kubelet.
 func (s *Server) ServeHTTP(w http.ResponseWriter, req *http.Request) {
-	defer httplog.NewLogged(req, &w).StacktraceWhen(
-		httplog.StatusIsNot(
-			http.StatusOK,
-			http.StatusFound,
-			http.StatusMovedPermanently,
-			http.StatusTemporaryRedirect,
-			http.StatusBadRequest,
-			http.StatusNotFound,
-			http.StatusSwitchingProtocols,
-		),
-	).Log()
+	defer httplog.NewLogged(req, &w).StacktraceWhen(statusesNoTracePred).Log()
 
 	// monitor http requests
 	var serverType string

staging/src/k8s.io/apiserver/pkg/server/httplog/httplog.go

@@ -125,13 +125,13 @@ func (rl *respLogger) StacktraceWhen(pred StacktracePred) *respLogger {
 // StatusIsNot returns a StacktracePred which will cause stacktraces to be logged
 // for any status *not* in the given list.
 func StatusIsNot(statuses ...int) StacktracePred {
+	statusesNoTrace := map[int]bool{}
+	for _, s := range statuses {
+		statusesNoTrace[s] = true
+	}
 	return func(status int) bool {
-		for _, s := range statuses {
-			if status == s {
-				return false
-			}
-		}
-		return true
+		_, ok := statusesNoTrace[status]
+		return !ok
 	}
 }