rebase: update all k8s packages to 0.27.2

Signed-off-by: Niels de Vos <ndevos@ibm.com>

vendor/k8s.io/apiserver/pkg/server/routes/debugsocket.go

@@ -0,0 +1,82 @@
+/*
+Copyright 2022 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package routes
+
+import (
+	"fmt"
+	"net"
+	"net/http"
+	"net/http/pprof"
+	"os"
+	"path"
+)
+
+// DebugSocket installs profiling and debugflag as a Unix-Domain socket.
+type DebugSocket struct {
+	path string
+	mux  *http.ServeMux
+}
+
+// NewDebugSocket creates a new DebugSocket for the given path.
+func NewDebugSocket(path string) *DebugSocket {
+	return &DebugSocket{
+		path: path,
+		mux:  http.NewServeMux(),
+	}
+}
+
+// InstallProfiling installs profiling endpoints in the socket.
+func (s *DebugSocket) InstallProfiling() {
+	s.mux.HandleFunc("/debug/pprof", redirectTo("/debug/pprof/"))
+	s.mux.HandleFunc("/debug/pprof/", pprof.Index)
+	s.mux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
+	s.mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
+	s.mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
+	s.mux.HandleFunc("/debug/pprof/trace", pprof.Trace)
+}
+
+// InstallDebugFlag installs debug flag endpoints in the socket.
+func (s *DebugSocket) InstallDebugFlag(flag string, handler func(http.ResponseWriter, *http.Request)) {
+	f := DebugFlags{}
+	s.mux.HandleFunc("/debug/flags", f.Index)
+	s.mux.HandleFunc("/debug/flags/", f.Index)
+
+	url := path.Join("/debug/flags", flag)
+	s.mux.HandleFunc(url, handler)
+
+	f.addFlag(flag)
+}
+
+// Run starts the server and waits for stopCh to be closed to close the server.
+func (s *DebugSocket) Run(stopCh <-chan struct{}) error {
+	if err := os.Remove(s.path); err != nil && !os.IsNotExist(err) {
+		return fmt.Errorf("failed to remove (%v): %v", s.path, err)
+	}
+
+	l, err := net.Listen("unix", s.path)
+	if err != nil {
+		return fmt.Errorf("listen error (%v): %v", s.path, err)
+	}
+	defer l.Close()
+
+	srv := http.Server{Handler: s.mux}
+	go func() {
+		<-stopCh
+		srv.Close()
+	}()
+	return srv.Serve(l)
+}