main.go

// Copyright 2020 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0

package main

import (
	"flag"
	"os"
	"time"

	"k8s.io/apimachinery/pkg/runtime"
	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
	_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
	appv1beta1 "sigs.k8s.io/application/api/v1beta1"
	"sigs.k8s.io/application/controllers"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/log/zap"
	// +kubebuilder:scaffold:imports
)

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

func init() {
	_ = clientgoscheme.AddToScheme(scheme)

	_ = appv1beta1.AddToScheme(scheme)
	// +kubebuilder:scaffold:scheme
}

func main() {
	var namespace string
	var metricsAddr string
	var syncPeriod int64
	var enableLeaderElection bool
	flag.StringVar(&namespace, "namespace", "", "Namespace within which CRD controller is running.")
	flag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.")
	flag.Int64Var(&syncPeriod, "sync-period", 120, "Sync every sync-period seconds.")
	flag.BoolVar(&enableLeaderElection, "enable-leader-election", false,
		"Enable leader election for controller kube-app-manager. Enabling this will ensure there is only one active controller kube-app-manager.")
	flag.Parse()

	ctrl.SetLogger(zap.New(func(o *zap.Options) {
		o.Development = true
	}))

	syncPeriodD := time.Duration(int64(time.Second) * syncPeriod)
	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
		Scheme:             scheme,
		MetricsBindAddress: metricsAddr,
		LeaderElection:     enableLeaderElection,
		Port:               9443,
		SyncPeriod:         &syncPeriodD,
		Namespace:          namespace,
	})
	if err != nil {
		setupLog.Error(err, "unable to start kube-app-manager")
		os.Exit(1)
	}

	if err = (&controllers.ApplicationReconciler{
		Client: mgr.GetClient(),
		Mapper: mgr.GetRESTMapper(),
		Log:    ctrl.Log.WithName("controllers").WithName("Application"),
		Scheme: mgr.GetScheme(),
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "Application")
		os.Exit(1)
	}
	// +kubebuilder:scaffold:builder

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