main.go

/*
Copyright 2019 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"
	"os"
	"time"

	ipamv1 "github.com/metal3-io/ip-address-manager/api/v1alpha1"
	"github.com/metal3-io/ip-address-manager/controllers"
	"github.com/metal3-io/ip-address-manager/ipam"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/client-go/kubernetes/scheme"
	_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
	"k8s.io/klog"
	"k8s.io/klog/klogr"
	clusterv1 "sigs.k8s.io/cluster-api/api/v1alpha3"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/healthz"
	// +kubebuilder:scaffold:imports
)

var (
	myscheme             = runtime.NewScheme()
	setupLog             = ctrl.Log.WithName("setup")
	metricsAddr          string
	enableLeaderElection bool
	syncPeriod           time.Duration
	webhookPort          int
	healthAddr           string
	watchNamespace       string
)

func init() {
	_ = scheme.AddToScheme(myscheme)
	_ = ipamv1.AddToScheme(myscheme)
	_ = clusterv1.AddToScheme(myscheme)
	// +kubebuilder:scaffold:scheme
}

func main() {
	klog.InitFlags(nil)
	flag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.")
	flag.BoolVar(&enableLeaderElection, "enable-leader-election", false,
		"Enable leader election for controller manager. Enabling this will ensure there is only one active controller manager.")
	flag.StringVar(&watchNamespace, "namespace", "",
		"Namespace that the controller watches to reconcile CAPM3 objects. If unspecified, the controller watches for CAPM3 objects across all namespaces.")
	flag.DurationVar(&syncPeriod, "sync-period", 10*time.Minute,
		"The minimum interval at which watched resources are reconciled (e.g. 15m)")
	flag.IntVar(&webhookPort, "webhook-port", 0,
		"Webhook Server port (set to 0 to disable)")
	flag.StringVar(&healthAddr, "health-addr", ":9440",
		"The address the health endpoint binds to.")
	flag.Parse()

	ctrl.SetLogger(klogr.New())

	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
		Scheme:                 myscheme,
		MetricsBindAddress:     metricsAddr,
		LeaderElection:         enableLeaderElection,
		LeaderElectionID:       "controller-leader-election-ipam-capm3",
		SyncPeriod:             &syncPeriod,
		Port:                   webhookPort,
		HealthProbeBindAddress: healthAddr,
		Namespace:              watchNamespace,
	})
	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}

	setupChecks(mgr)
	setupReconcilers(mgr)
	setupWebhooks(mgr)

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

func setupChecks(mgr ctrl.Manager) {
	if err := mgr.AddReadyzCheck("ping", healthz.Ping); err != nil {
		setupLog.Error(err, "unable to create ready check")
		os.Exit(1)
	}

	if err := mgr.AddHealthzCheck("ping", healthz.Ping); err != nil {
		setupLog.Error(err, "unable to create health check")
		os.Exit(1)
	}
}

func setupReconcilers(mgr ctrl.Manager) {
	if webhookPort != 0 {
		return
	}

	if err := (&controllers.IPPoolReconciler{
		Client:         mgr.GetClient(),
		ManagerFactory: ipam.NewManagerFactory(mgr.GetClient()),
		Log:            ctrl.Log.WithName("controllers").WithName("IPPool"),
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "IPPoolReconciler")
		os.Exit(1)
	}
}

func setupWebhooks(mgr ctrl.Manager) {
	if webhookPort == 0 {
		return
	}

	if err := (&ipamv1.IPPool{}).SetupWebhookWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create webhook", "webhook", "IPPool")
		os.Exit(1)
	}

	if err := (&ipamv1.IPAddress{}).SetupWebhookWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create webhook", "webhook", "IPAddress")
		os.Exit(1)
	}

	if err := (&ipamv1.IPClaim{}).SetupWebhookWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create webhook", "webhook", "IPClaim")
		os.Exit(1)
	}
}