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main.go
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main.go
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// Copyright 2018 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"context"
"flag"
"net/http"
_ "net/http/pprof"
"os"
"os/signal"
"reflect"
"syscall"
"github.com/pingcap/advanced-statefulset/client/apis/apps/v1/helper"
asclientset "github.com/pingcap/advanced-statefulset/client/client/clientset/versioned"
"github.com/pingcap/tidb-operator/pkg/client/clientset/versioned"
"github.com/pingcap/tidb-operator/pkg/controller"
"github.com/pingcap/tidb-operator/pkg/controller/autoscaler"
"github.com/pingcap/tidb-operator/pkg/controller/backup"
"github.com/pingcap/tidb-operator/pkg/controller/backupschedule"
"github.com/pingcap/tidb-operator/pkg/controller/dmcluster"
"github.com/pingcap/tidb-operator/pkg/controller/periodicity"
"github.com/pingcap/tidb-operator/pkg/controller/restore"
"github.com/pingcap/tidb-operator/pkg/controller/tidbcluster"
"github.com/pingcap/tidb-operator/pkg/controller/tidbinitializer"
"github.com/pingcap/tidb-operator/pkg/controller/tidbmonitor"
"github.com/pingcap/tidb-operator/pkg/controller/tidbngmonitoring"
"github.com/pingcap/tidb-operator/pkg/features"
"github.com/pingcap/tidb-operator/pkg/metrics"
"github.com/pingcap/tidb-operator/pkg/scheme"
"github.com/pingcap/tidb-operator/pkg/upgrader"
"github.com/pingcap/tidb-operator/pkg/version"
"github.com/prometheus/client_golang/prometheus/promhttp"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/tools/leaderelection"
"k8s.io/client-go/tools/leaderelection/resourcelock"
"k8s.io/client-go/tools/record"
"k8s.io/component-base/logs"
"k8s.io/klog"
"sigs.k8s.io/controller-runtime/pkg/client"
)
func main() {
var cfg *rest.Config
cliCfg := controller.DefaultCLIConfig()
cliCfg.AddFlag(flag.CommandLine)
features.DefaultFeatureGate.AddFlag(flag.CommandLine)
flag.Parse()
if cliCfg.PrintVersion {
version.PrintVersionInfo()
os.Exit(0)
}
logs.InitLogs()
defer logs.FlushLogs()
version.LogVersionInfo()
flag.VisitAll(func(flag *flag.Flag) {
klog.V(1).Infof("FLAG: --%s=%q", flag.Name, flag.Value)
})
metrics.RegisterMetrics()
hostName, err := os.Hostname()
if err != nil {
klog.Fatalf("failed to get hostname: %v", err)
}
ns := os.Getenv("NAMESPACE")
if ns == "" {
klog.Fatal("NAMESPACE environment variable not set")
}
helmRelease := os.Getenv("HELM_RELEASE")
if helmRelease == "" {
klog.Info("HELM_RELEASE environment variable not set")
}
kubconfig := os.Getenv("KUBECONFIG")
if kubconfig != "" {
cfg, err = clientcmd.BuildConfigFromFlags("", kubconfig)
} else {
cfg, err = rest.InClusterConfig()
}
if err != nil {
klog.Fatalf("failed to get config: %v", err)
}
cli, err := versioned.NewForConfig(cfg)
if err != nil {
klog.Fatalf("failed to create Clientset: %v", err)
}
var kubeCli kubernetes.Interface
kubeCli, err = kubernetes.NewForConfig(cfg)
if err != nil {
klog.Fatalf("failed to get kubernetes Clientset: %v", err)
}
asCli, err := asclientset.NewForConfig(cfg)
if err != nil {
klog.Fatalf("failed to get advanced-statefulset Clientset: %v", err)
}
// TODO: optimize the read of genericCli with the shared cache
genericCli, err := client.New(cfg, client.Options{Scheme: scheme.Scheme})
if err != nil {
klog.Fatalf("failed to get the generic kube-apiserver client: %v", err)
}
// note that kubeCli here must not be the hijacked one
var operatorUpgrader upgrader.Interface
if cliCfg.ClusterScoped {
operatorUpgrader = upgrader.NewUpgrader(kubeCli, cli, asCli, metav1.NamespaceAll)
} else {
operatorUpgrader = upgrader.NewUpgrader(kubeCli, cli, asCli, ns)
}
if features.DefaultFeatureGate.Enabled(features.AdvancedStatefulSet) {
// If AdvancedStatefulSet is enabled, we hijack the Kubernetes client to use
// AdvancedStatefulSet.
kubeCli = helper.NewHijackClient(kubeCli, asCli)
}
deps, err := controller.NewDependencies(ns, cliCfg, cli, kubeCli, genericCli)
if err != nil {
klog.Fatalf("failed to create Dependencies: %s", err)
}
onStarted := func(ctx context.Context) {
// Upgrade before running any controller logic. If it fails, we wait
// for process supervisor to restart it again.
if err := operatorUpgrader.Upgrade(); err != nil {
klog.Fatalf("failed to upgrade: %v", err)
}
// Define some nested types to simplify the codebase
type Controller interface {
Run(int, <-chan struct{})
}
type InformerFactory interface {
Start(stopCh <-chan struct{})
WaitForCacheSync(stopCh <-chan struct{}) map[reflect.Type]bool
}
// Initialize all controllers
controllers := []Controller{
tidbcluster.NewController(deps),
dmcluster.NewController(deps),
backup.NewController(deps),
restore.NewController(deps),
backupschedule.NewController(deps),
tidbinitializer.NewController(deps),
tidbmonitor.NewController(deps),
tidbngmonitoring.NewController(deps),
}
if cliCfg.PodWebhookEnabled {
controllers = append(controllers, periodicity.NewController(deps))
}
if features.DefaultFeatureGate.Enabled(features.AutoScaling) {
controllers = append(controllers, autoscaler.NewController(deps))
}
// Start informer factories after all controllers are initialized.
informerFactories := []InformerFactory{
deps.InformerFactory,
deps.KubeInformerFactory,
deps.LabelFilterKubeInformerFactory,
}
for _, f := range informerFactories {
f.Start(ctx.Done())
for v, synced := range f.WaitForCacheSync(wait.NeverStop) {
if !synced {
klog.Fatalf("error syncing informer for %v", v)
}
}
}
klog.Info("cache of informer factories sync successfully")
// Start syncLoop for all controllers
for _, controller := range controllers {
c := controller
go wait.Forever(func() { c.Run(cliCfg.Workers, ctx.Done()) }, cliCfg.WaitDuration)
}
}
onStopped := func() {
klog.Fatal("leader election lost")
}
endPointsName := "tidb-controller-manager"
if helmRelease != "" {
endPointsName += "-" + helmRelease
}
// leader election for multiple tidb-controller-manager instances
go wait.Forever(func() {
leaderelection.RunOrDie(context.TODO(), leaderelection.LeaderElectionConfig{
Lock: &resourcelock.EndpointsLock{
EndpointsMeta: metav1.ObjectMeta{
Namespace: ns,
Name: endPointsName,
},
Client: kubeCli.CoreV1(),
LockConfig: resourcelock.ResourceLockConfig{
Identity: hostName,
EventRecorder: &record.FakeRecorder{},
},
},
LeaseDuration: cliCfg.LeaseDuration,
RenewDeadline: cliCfg.RenewDeadline,
RetryPeriod: cliCfg.RetryPeriod,
Callbacks: leaderelection.LeaderCallbacks{
OnStartedLeading: onStarted,
OnStoppedLeading: onStopped,
},
})
}, cliCfg.WaitDuration)
srv := createHTTPServer()
sc := make(chan os.Signal, 1)
signal.Notify(sc,
syscall.SIGHUP,
syscall.SIGINT,
syscall.SIGTERM,
syscall.SIGQUIT,
)
go func() {
sig := <-sc
klog.Infof("got signal %s to exit", sig)
if err2 := srv.Shutdown(context.Background()); err2 != nil {
klog.Fatal("fail to shutdown the HTTP server", err2)
}
}()
if err = srv.ListenAndServe(); err != http.ErrServerClosed {
klog.Fatal(err)
}
klog.Infof("tidb-controller-manager exited")
}
func createHTTPServer() *http.Server {
serverMux := http.NewServeMux()
// HTTP path for prometheus.
serverMux.Handle("/metrics", promhttp.Handler())
return &http.Server{
Addr: ":6060",
Handler: serverMux,
}
}