main.go

// Copyright © 2019 Banzai Cloud
//
// 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.

/*

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"
	"strings"

	"sigs.k8s.io/controller-runtime/pkg/cache"

	istioclientv1alpha3 "github.com/banzaicloud/istio-client-go/pkg/networking/v1alpha3"
	banzaiistiov1beta1 "github.com/banzaicloud/istio-operator/pkg/apis/istio/v1beta1"
	certv1 "github.com/jetstack/cert-manager/pkg/apis/certmanager/v1alpha2"
	"k8s.io/apimachinery/pkg/runtime"
	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
	_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/log/zap"

	banzaicloudv1alpha1 "github.com/banzaicloud/kafka-operator/api/v1alpha1"
	banzaicloudv1beta1 "github.com/banzaicloud/kafka-operator/api/v1beta1"
	"github.com/banzaicloud/kafka-operator/controllers"
	"github.com/banzaicloud/kafka-operator/pkg/webhook"
	// +kubebuilder:scaffold:imports
)

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

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

	_ = banzaicloudv1alpha1.AddToScheme(scheme)

	_ = banzaicloudv1beta1.AddToScheme(scheme)

	_ = banzaiistiov1beta1.AddToScheme(scheme)

	_ = istioclientv1alpha3.AddToScheme(scheme)
	// +kubebuilder:scaffold:scheme
}

func main() {
	var (
		namespaces           string
		metricsAddr          string
		enableLeaderElection bool
		webhookCertDir       string
		webhookDisabled      bool
		verboseLogging       bool
		certManagerEnabled   bool
	)

	flag.StringVar(&namespaces, "namespaces", "", "Comma separated list of namespaces where operator listens for resources")
	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.BoolVar(&webhookDisabled, "disable-webhooks", false, "Disable webhooks used to validate custom resources")
	flag.StringVar(&webhookCertDir, "tls-cert-dir", "/etc/webhook/certs", "The directory with a tls.key and tls.crt for serving HTTPS requests")
	flag.BoolVar(&verboseLogging, "verbose", false, "Enable verbose logging")
	flag.BoolVar(&certManagerEnabled, "cert-manager-enabled", false, "Enable cert-manager integration")
	flag.Parse()

	ctrl.SetLogger(zap.Logger(verboseLogging))

	//When operator is started to watch resources in a specific set of namespaces, we use the MultiNamespacedCacheBuilder cache.
	//In this scenario, it is also suggested to restrict the provided authorization to this namespace by replacing the default
	//ClusterRole and ClusterRoleBinding to Role and RoleBinding respectively
	//For further information see the kubernetes documentation about
	//Using [RBAC Authorization](https://kubernetes.io/docs/reference/access-authn-authz/rbac/).
	managerWatchCache := (cache.NewCacheFunc)(nil)
	var namespaceList []string
	if namespaces != "" {
		namespaceList = strings.Split(namespaces, ",")
		for i := range namespaceList {
			namespaceList[i] = strings.TrimSpace(namespaceList[i])
		}
		managerWatchCache = cache.MultiNamespacedCacheBuilder(namespaceList)
	}

	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
		Scheme:             scheme,
		MetricsBindAddress: metricsAddr,
		LeaderElection:     enableLeaderElection,
		LeaderElectionID:   "controller-leader-election-helper",
		NewCache:           managerWatchCache,
	})

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

	if err := certv1.AddToScheme(mgr.GetScheme()); err != nil {
		setupLog.Error(err, "")
		os.Exit(1)
	}

	if err = controllers.SetAlertManagerWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "AlertManagerForKafka")
		os.Exit(1)
	}

	kafkaClusterReconciler := &controllers.KafkaClusterReconciler{
		Client:       mgr.GetClient(),
		DirectClient: mgr.GetAPIReader(),
		Scheme:       mgr.GetScheme(),
		Namespaces:   namespaceList,
		Log:          ctrl.Log.WithName("controllers").WithName("KafkaCluster"),
	}

	if err = controllers.SetupKafkaClusterWithManager(mgr, kafkaClusterReconciler.Log).Complete(kafkaClusterReconciler); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "KafkaCluster")
		os.Exit(1)
	}

	if err = controllers.SetupKafkaTopicWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "KafkaTopic")
		os.Exit(1)
	}

	if err = controllers.SetupKafkaUserWithManager(mgr, certManagerEnabled); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "KafkaUser")
		os.Exit(1)
	}

	kafkaClusterCCReconciler := &controllers.CruiseControlTaskReconciler{
		Client: mgr.GetClient(),
		Scheme: mgr.GetScheme(),
		Log:    ctrl.Log.WithName("controller").WithName("CruiseControlTask"),
	}

	if err = controllers.SetupCruiseControlWithManager(mgr).Complete(kafkaClusterCCReconciler); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "CruiseControl")
		os.Exit(1)
	}

	if !webhookDisabled {
		webhook.SetupServerHandlers(mgr, webhookCertDir)
	}

	// +kubebuilder:scaffold:builder

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