main.go

/*
Copyright 2019 Bloomberg Finance LP.

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

	solrv1beta1 "github.com/bloomberg/solr-operator/api/v1beta1"
	"github.com/bloomberg/solr-operator/controllers"
	zkv1beta1 "github.com/pravega/zookeeper-operator/pkg/apis"
	k8sRuntime "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"
	// +kubebuilder:scaffold:imports
)

const (
	EnvOperatorPodName      = "POD_NAME"
	EnvOperatorPodNamespace = "POD_NAMESPACE"
)

var (
	scheme   = k8sRuntime.NewScheme()
	setupLog = ctrl.Log.WithName("setup")

	namespace string
	name      string

	// Version information for the Solr Operator
	Version   string
	BuildTime string
	GitSHA    string

	// Operator scope
	watchNamespaces string

	// External Operator dependencies
	useZookeeperCRD bool

	// Addressability Options
	ingressBaseDomain string
)

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

	_ = solrv1beta1.AddToScheme(scheme)
	_ = zkv1beta1.AddToScheme(scheme)

	// +kubebuilder:scaffold:scheme
	flag.BoolVar(&useZookeeperCRD, "zk-operator", true, "The operator will not use the zk operator & crd when this flag is set to false.")
	flag.StringVar(&ingressBaseDomain, "ingress-base-domain", "", "The operator will use this base domain for host matching in an ingress for the cloud.")
	flag.StringVar(&watchNamespaces, "watch-namespaces", "", "The comma-separated list of namespaces to watch. If an empty string (default) is provided, the operator will watch the entire Kubernetes cluster.")
	flag.Parse()
}

func main() {
	namespace = os.Getenv(EnvOperatorPodNamespace)
	if len(namespace) == 0 {
		//log.Fatalf("must set env (%s)", constants.EnvOperatorPodNamespace)
	}
	name = os.Getenv(EnvOperatorPodName)
	if len(name) == 0 {
		//log.Fatalf("must set env (%s)", constants.EnvOperatorPodName)
	}

	var metricsAddr string
	var enableLeaderElection bool
	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.Parse()

	ctrl.SetLogger(zap.Logger(true))

	setupLog.Info(fmt.Sprintf("solr-operator Version: %v", Version))
	setupLog.Info(fmt.Sprintf("solr-operator Git SHA: %s", GitSHA))
	setupLog.Info(fmt.Sprintf("solr-operator Build Time: %s", BuildTime))
	setupLog.Info(fmt.Sprintf("Go Version: %v", runtime.Version()))
	setupLog.Info(fmt.Sprintf("Go OS/Arch: %s / %s", runtime.GOOS, runtime.GOARCH))

	// When the 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/).
	var managerWatchCache cache.NewCacheFunc
	if watchNamespaces != "" {
		setupLog.Info(fmt.Sprintf("Managing for Namespaces: %s", watchNamespaces))
		ns := strings.Split(watchNamespaces, ",")
		for i := range ns {
			ns[i] = strings.TrimSpace(ns[i])
		}
		managerWatchCache = cache.MultiNamespacedCacheBuilder(ns)
	} else {
		setupLog.Info("Managing for the entire cluster.")
		managerWatchCache = (cache.NewCacheFunc)(nil)
	}

	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
		Scheme:             scheme,
		MetricsBindAddress: metricsAddr,
		LeaderElection:     enableLeaderElection,
		Port:               9443,
		NewCache:           managerWatchCache,
	})
	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}

	controllers.SetIngressBaseUrl(ingressBaseDomain)
	controllers.UseZkCRD(useZookeeperCRD)

	if err = (&controllers.SolrCloudReconciler{
		Client: mgr.GetClient(),
		Log:    ctrl.Log.WithName("controllers").WithName("SolrCloud"),
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "SolrCloud")
		os.Exit(1)
	}
	if err = (&controllers.SolrBackupReconciler{
		Client: mgr.GetClient(),
		Log:    ctrl.Log.WithName("controllers").WithName("SolrBackup"),
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "SolrBackup")
		os.Exit(1)
	}
	if err = (&controllers.SolrCollectionReconciler{
		Client: mgr.GetClient(),
		Log:    ctrl.Log.WithName("controllers").WithName("SolrCollection"),
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "SolrCollection")
		os.Exit(1)
	}
	if err = (&controllers.SolrPrometheusExporterReconciler{
		Client: mgr.GetClient(),
		Log:    ctrl.Log.WithName("controllers").WithName("SolrPrometheusExporter"),
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "SolrPrometheusExporter")
		os.Exit(1)
	}
	if err = (&controllers.SolrCollectionAliasReconciler{
		Client: mgr.GetClient(),
		Log:    ctrl.Log.WithName("controllers").WithName("SolrCollectionAlias"),
		Scheme: mgr.GetScheme(),
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "SolrCollectionAlias")
		os.Exit(1)
	}
	// +kubebuilder:scaffold:builder

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