controller-manager: switch to config/option struct pattern

cmd/controller-manager/app/serve.go

@@ -0,0 +1,51 @@
+/*
+Copyright 2018 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 app
+
+import (
+	"net/http"
+	"net/http/pprof"
+	goruntime "runtime"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+
+	"k8s.io/apiserver/pkg/server/healthz"
+	"k8s.io/kubernetes/pkg/util/configz"
+)
+
+type serveFunc func(handler http.Handler, shutdownTimeout time.Duration, stopCh <-chan struct{}) error
+
+// Serve creates a base handler chain for a controller manager. It runs the
+// the chain with the given serveFunc.
+func Serve(c *CompletedConfig, serveFunc serveFunc, stopCh <-chan struct{}) error {
+	mux := http.NewServeMux()
+	healthz.InstallHandler(mux)
+	if c.ComponentConfig.EnableProfiling {
+		mux.HandleFunc("/debug/pprof/", pprof.Index)
+		mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
+		mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
+		mux.HandleFunc("/debug/pprof/trace", pprof.Trace)
+		if c.ComponentConfig.EnableContentionProfiling {
+			goruntime.SetBlockProfileRate(1)
+		}
+	}
+	configz.InstallHandler(mux)
+	mux.Handle("/metrics", prometheus.Handler())
+
+	return serveFunc(mux, 0, stopCh)
+}