main.go

/*
   Copyright 2021 VMware, Inc.
   SPDX-License-Identifier: Apache-2.0
*/

package main

import (
	"context"
	_ "embed"
	"flag"
	"os"
	"time"

	"go.uber.org/zap/zapcore"
	"k8s.io/apimachinery/pkg/runtime"
	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
	"k8s.io/client-go/kubernetes/scheme"
	"k8s.io/klog"
	clusterv1beta1 "sigs.k8s.io/cluster-api/api/v1beta1"
	bootstrapv1beta1 "sigs.k8s.io/cluster-api/bootstrap/kubeadm/api/v1beta1"
	addonsv1 "sigs.k8s.io/cluster-api/exp/addons/api/v1beta1"
	"sigs.k8s.io/controller-runtime/pkg/controller"

	infrav1alpha4 "github.com/vmware/cluster-api-provider-cloud-director/api/v1alpha4"
	infrav1beta1 "github.com/vmware/cluster-api-provider-cloud-director/api/v1beta1"
	infrav1beta2 "github.com/vmware/cluster-api-provider-cloud-director/api/v1beta2"
	"github.com/vmware/cluster-api-provider-cloud-director/controllers"

	// Import all Kubernetes client auth plugins (e.g. Azure, GCP, OIDC, etc.)
	// to ensure that exec-entrypoint and run can make use of them.
	_ "k8s.io/client-go/plugin/pkg/client/auth"
	kcpv1beta1 "sigs.k8s.io/cluster-api/controlplane/kubeadm/api/v1beta1"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/healthz"
	"sigs.k8s.io/controller-runtime/pkg/log/zap"
)

//go:embed release/version
var capVCDVersion string

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

func init() {
	klog.InitFlags(nil)
	utilruntime.Must(scheme.AddToScheme(myscheme))
	// We need both schemes in order to be able to handle v1alpha4 and v1beta1 Infra objects. We can remove the v1alpha4
	// when that version gets deprecated. However we will handle v1alpha4 objects by converting them to the v1beta1 hub.
	utilruntime.Must(infrav1alpha4.AddToScheme(myscheme))
	utilruntime.Must(infrav1beta1.AddToScheme(myscheme))
	utilruntime.Must(infrav1beta2.AddToScheme(myscheme))
	// We only need the v1beta1 for core CAPI since their webhooks will convert v1alpha4 to v1beta1. We will handle all
	// core CAPI objects using v1beta1 using the available webhook conversion. Hence v1beta1 support in core CAPI is
	// mandatory.
	utilruntime.Must(clusterv1beta1.AddToScheme(myscheme))
	utilruntime.Must(kcpv1beta1.AddToScheme(myscheme))
	utilruntime.Must(bootstrapv1beta1.AddToScheme(myscheme))
	// We need the addonsv1 scheme in order to list the ClusterResourceSetBindings addon.
	utilruntime.Must(addonsv1.AddToScheme(myscheme))
}

func main() {
	var metricsAddr string
	var enableLeaderElection bool
	var probeAddr string
	var syncPeriod time.Duration
	var concurrency int

	flag.StringVar(&metricsAddr, "metrics-bind-address", ":8080", "The address the metric endpoint binds to.")
	flag.StringVar(&probeAddr, "health-probe-bind-address", ":8081", "The address the probe endpoint binds to.")
	flag.BoolVar(&enableLeaderElection, "leader-elect", false,
		"Enable leader election for controller manager. "+
			"Enabling this will ensure there is only one active controller manager.")
	flag.DurationVar(&syncPeriod, "sync-period", 10*time.Minute,
		"The minimum interval at which watched resources are reconciled (e.g. 15m)")
	flag.IntVar(&concurrency, "concurrency", 10,
		"The number of VCD machines to process simultaneously")

	opts := zap.Options{
		Development: true,
		TimeEncoder: zapcore.ISO8601TimeEncoder, // ISO8601 Format: 2022-10-25T05:58:15.639Z
	}
	opts.BindFlags(flag.CommandLine)
	flag.Parse()

	ctrl.SetLogger(zap.New(zap.UseFlagOptions(&opts)))

	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
		Scheme:                 myscheme,
		MetricsBindAddress:     metricsAddr,
		Port:                   9443,
		SyncPeriod:             &syncPeriod,
		HealthProbeBindAddress: probeAddr,
		LeaderElection:         enableLeaderElection,
		LeaderElectionID:       "cluster.x-k8s.io",
	})
	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}

	ctx := context.Background()

	if err = (&controllers.VCDMachineReconciler{
		Client: mgr.GetClient(),
	}).SetupWithManager(ctx, mgr, controller.Options{
		MaxConcurrentReconciles: concurrency,
	}); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "VCDMachine")
		os.Exit(1)
	}

	if err = (&controllers.VCDClusterReconciler{
		Client: mgr.GetClient(),
		Scheme: mgr.GetScheme(),
	}).SetupWithManager(mgr, controller.Options{
		MaxConcurrentReconciles: concurrency,
	}); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "VCDCluster")
		os.Exit(1)
	}
	if os.Getenv("ENABLE_WEBHOOKS") != "false" {
		if err = (&infrav1beta2.VCDCluster{}).SetupWebhookWithManager(mgr); err != nil {
			setupLog.Error(err, "unable to create webhook", "webhook", "VCDCluster")
			os.Exit(1)
		}
		if err = (&infrav1beta2.VCDMachine{}).SetupWebhookWithManager(mgr); err != nil {
			setupLog.Error(err, "unable to create webhook", "webhook", "VCDMachine")
			os.Exit(1)
		}
		if err = (&infrav1beta2.VCDMachineTemplate{}).SetupWebhookWithManager(mgr); err != nil {
			setupLog.Error(err, "unable to create webhook", "webhook", "VCDMachineTemplate")
			os.Exit(1)
		}
	}

	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)
	}

	// TODO: check if entity type [capvcdCluster:1.1.0] is already registered

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