main.go

/*
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 main

import (
	"flag"
	"fmt"
	"os"
	"time"

	"github.com/spf13/pflag"
	"k8s.io/apimachinery/pkg/runtime"
	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
	_ "k8s.io/client-go/plugin/pkg/client/auth"
	"k8s.io/component-base/logs"
	logsv1 "k8s.io/component-base/logs/api/v1"
	_ "k8s.io/component-base/logs/json/register"
	"k8s.io/klog/v2"
	addonsv1alpha1 "sigs.k8s.io/cluster-api-addon-provider-helm/api/v1alpha1"
	chartcontroller "sigs.k8s.io/cluster-api-addon-provider-helm/controllers/helmchartproxy"
	releasecontroller "sigs.k8s.io/cluster-api-addon-provider-helm/controllers/helmreleaseproxy"
	"sigs.k8s.io/cluster-api-addon-provider-helm/internal"
	"sigs.k8s.io/cluster-api-addon-provider-helm/version"
	clusterv1 "sigs.k8s.io/cluster-api/api/v1beta1"
	kcpv1 "sigs.k8s.io/cluster-api/controlplane/kubeadm/api/v1beta1"
	"sigs.k8s.io/cluster-api/feature"
	"sigs.k8s.io/cluster-api/util/flags"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/cache"
	"sigs.k8s.io/controller-runtime/pkg/controller"
	"sigs.k8s.io/controller-runtime/pkg/healthz"
	"sigs.k8s.io/controller-runtime/pkg/webhook"
)

var (
	scheme   = runtime.NewScheme()
	setupLog = ctrl.Log.WithName("setup")

	enableLeaderElection        bool
	leaderElectionLeaseDuration time.Duration
	leaderElectionRenewDeadline time.Duration
	leaderElectionRetryPeriod   time.Duration
	watchNamespace              string
	watchFilterValue            string
	profilerAddress             string
	helmChartProxyConcurrency   int
	helmReleaseProxyConcurrency int
	syncPeriod                  time.Duration
	healthAddr                  string
	webhookPort                 int
	webhookCertDir              string
	diagnosticsOptions          = flags.DiagnosticsOptions{}
	logOptions                  = logs.NewOptions()
)

func init() {
	utilruntime.Must(clientgoscheme.AddToScheme(scheme))

	utilruntime.Must(addonsv1alpha1.AddToScheme(scheme))
	//+kubebuilder:scaffold:scheme
}

// InitFlags initializes the flags.
func InitFlags(fs *pflag.FlagSet) {
	logsv1.AddFlags(logOptions, fs)

	fs.BoolVar(&enableLeaderElection, "leader-elect", false,
		"Enable leader election for controller manager. Enabling this will ensure there is only one active controller manager.")

	fs.DurationVar(&leaderElectionLeaseDuration, "leader-elect-lease-duration", 15*time.Second,
		"Interval at which non-leader candidates will wait to force acquire leadership (duration string)")

	fs.DurationVar(&leaderElectionRenewDeadline, "leader-elect-renew-deadline", 10*time.Second,
		"Duration that the leading controller manager will retry refreshing leadership before giving up (duration string)")

	fs.DurationVar(&leaderElectionRetryPeriod, "leader-elect-retry-period", 2*time.Second,
		"Duration the LeaderElector clients should wait between tries of actions (duration string)")

	fs.StringVar(&watchNamespace, "namespace", "",
		"Namespace that the controller watches to reconcile cluster-api objects. If unspecified, the controller watches for cluster-api objects across all namespaces.")

	fs.StringVar(&watchFilterValue, "watch-filter", "",
		fmt.Sprintf("Label value that the controller watches to reconcile cluster-api objects. The label key is always %s. If unspecified, the controller watches for all cluster-api objects.", clusterv1.WatchLabel))

	fs.StringVar(&profilerAddress, "profiler-address", "",
		"Bind address to expose the pprof profiler (e.g. localhost:6060)")

	fs.IntVar(&helmChartProxyConcurrency, "helm-chart-proxy-concurrency", 10,
		"Number of HelmChartProxies to process concurrently.")

	fs.IntVar(&helmReleaseProxyConcurrency, "helm-release-proxy-concurrency", 10,
		"Number of HelmReleaseProxies to process concurrently.")

	fs.DurationVar(&syncPeriod, "sync-period", 10*time.Minute,
		"Minimum interval at which watched resources are reconciled (e.g. 15m)")

	fs.IntVar(&webhookPort, "webhook-port", 9443,
		"Webhook Server port")

	fs.StringVar(&webhookCertDir, "webhook-cert-dir", "/tmp/k8s-webhook-server/serving-certs/",
		"Webhook cert dir, only used when webhook-port is specified.")

	fs.StringVar(&healthAddr, "health-addr", ":9440",
		"Address the health endpoint binds to.")

	flags.AddDiagnosticsOptions(fs, &diagnosticsOptions)

	feature.MutableGates.AddFlag(fs)
}

// Add RBAC for the authorized diagnostics endpoint.
// +kubebuilder:rbac:groups=authentication.k8s.io,resources=tokenreviews,verbs=create
// +kubebuilder:rbac:groups=authorization.k8s.io,resources=subjectaccessreviews,verbs=create

func main() {
	InitFlags(pflag.CommandLine)
	klog.InitFlags(flag.CommandLine)
	pflag.CommandLine.AddGoFlagSet(flag.CommandLine)
	// Set log level 2 as default.
	if err := pflag.CommandLine.Set("v", "2"); err != nil {
		setupLog.Error(err, "failed to set log level: %v")
		os.Exit(1)
	}
	pflag.Parse()

	diagnosticsOpts := flags.GetDiagnosticsOptions(diagnosticsOptions)

	var watchNamespaces map[string]cache.Config
	if watchNamespace != "" {
		watchNamespaces = map[string]cache.Config{
			watchNamespace: {},
		}
	}

	if err := logsv1.ValidateAndApply(logOptions, nil); err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}

	// klog.Background will automatically use the right logger.
	ctrl.SetLogger(klog.Background())

	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
		Scheme:                 scheme,
		LeaderElection:         enableLeaderElection,
		LeaderElectionID:       "controller-leader-election-caaph",
		LeaseDuration:          &leaderElectionLeaseDuration,
		RenewDeadline:          &leaderElectionRenewDeadline,
		HealthProbeBindAddress: healthAddr,
		PprofBindAddress:       profilerAddress,
		Metrics:                diagnosticsOpts,
		RetryPeriod:            &leaderElectionRetryPeriod,
		Cache: cache.Options{
			DefaultNamespaces: watchNamespaces,
			SyncPeriod:        &syncPeriod,
		},
		WebhookServer: webhook.NewServer(
			webhook.Options{
				Port:    webhookPort,
				CertDir: webhookCertDir,
			},
		),
	})
	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}

	// Any type we want the client to know about has to be added in the scheme.
	scheme := mgr.GetScheme()
	_ = clusterv1.AddToScheme(scheme)
	_ = kcpv1.AddToScheme(scheme)

	ctx := ctrl.SetupSignalHandler()

	if err = (&chartcontroller.HelmChartProxyReconciler{
		Client:           mgr.GetClient(),
		Scheme:           scheme,
		WatchFilterValue: watchFilterValue,
	}).SetupWithManager(ctx, mgr, controller.Options{MaxConcurrentReconciles: helmChartProxyConcurrency}); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "HelmChartProxy")
		os.Exit(1)
	}
	if err = (&addonsv1alpha1.HelmChartProxy{}).SetupWebhookWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create webhook", "webhook", "HelmChartProxy")
		os.Exit(1)
	}
	//+kubebuilder:scaffold:builder

	if err = (&releasecontroller.HelmReleaseProxyReconciler{
		Client:           mgr.GetClient(),
		Scheme:           scheme,
		HelmClient:       &internal.HelmClient{},
		WatchFilterValue: watchFilterValue,
	}).SetupWithManager(ctx, mgr, controller.Options{MaxConcurrentReconciles: helmReleaseProxyConcurrency}); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "HelmReleaseProxy")
		os.Exit(1)
	}
	if err = (&addonsv1alpha1.HelmReleaseProxy{}).SetupWebhookWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create webhook", "webhook", "HelmReleaseProxy")
		os.Exit(1)
	}
	//+kubebuilder:scaffold:builder

	if err := mgr.AddHealthzCheck("healthz", healthz.Ping); err != nil {
		setupLog.Error(err, "unable to set up health check")
		os.Exit(1)
	}
	if err := mgr.AddReadyzCheck("readyz", healthz.Ping); err != nil {
		setupLog.Error(err, "unable to set up ready check")
		os.Exit(1)
	}

	setupLog.Info("starting manager", "version", version.Get().String())
	if err := mgr.Start(ctx); err != nil {
		setupLog.Error(err, "problem running manager")
		os.Exit(1)
	}
}