main.go

/*


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"
	gr "runtime"

	eventloggerv1 "github.com/bakito/k8s-event-logger-operator/api/v1"
	"github.com/bakito/k8s-event-logger-operator/controllers/config"
	"github.com/bakito/k8s-event-logger-operator/controllers/logging"
	"github.com/bakito/k8s-event-logger-operator/controllers/setup"
	cnst "github.com/bakito/k8s-event-logger-operator/pkg/constants"
	"github.com/bakito/k8s-event-logger-operator/version"
	"github.com/bakito/operator-utils/pkg/pprof"
	"github.com/go-logr/zapr"
	zap2 "go.uber.org/zap"
	"go.uber.org/zap/zapcore"
	corev1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/runtime"
	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
	_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
	"k8s.io/klog/v2"
	ctrl "sigs.k8s.io/controller-runtime"
	crtlcache "sigs.k8s.io/controller-runtime/pkg/cache"
	"sigs.k8s.io/controller-runtime/pkg/healthz"
	"sigs.k8s.io/controller-runtime/pkg/log/zap"
	"sigs.k8s.io/controller-runtime/pkg/metrics/server"
	"sigs.k8s.io/controller-runtime/pkg/webhook"
)

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

func init() {
	utilruntime.Must(clientgoscheme.AddToScheme(scheme))
	utilruntime.Must(eventloggerv1.AddToScheme(scheme))
	utilruntime.Must(corev1.AddToScheme(scheme))
	// +kubebuilder:scaffold:scheme
}

func main() {
	var metricsAddr string
	var healthAddr string
	var profilingAddr string
	var configName string
	var enableLeaderElection bool
	var enableLoggerMode bool
	var enableProfiling bool
	flag.StringVar(&metricsAddr, cnst.ArgMetricsAddr, cnst.DefaultMetricsAddr, "The address the metric endpoint binds to.")
	flag.StringVar(&healthAddr, cnst.ArgHealthAddr, cnst.DefaultHealthAddr, "The address the health endpoint binds to.")
	flag.StringVar(&profilingAddr, cnst.ArgProfilingAddr, cnst.DefaultProfilingAddr, "The address the profiling endpoint binds to.")
	flag.BoolVar(&enableLeaderElection, cnst.ArgEnableLeaderElection, false,
		"Enable leader election for controller manager. Enabling this will ensure there is only one active controller manager.")
	flag.BoolVar(&enableLoggerMode, cnst.ArgEnableLoggerMode, false,
		"Enable logger mode. Enabling this will only log events of the current namespace.")
	flag.BoolVar(&enableProfiling, cnst.ArgEnableProfiling, false, "Enable profiling endpoint.")

	flag.StringVar(&configName, cnst.ArgConfigName, "",
		"The name of the eventlogger config to work with.")
	flag.Parse()

	o := func(o *zap.Options) {
		o.DestWriter = os.Stderr
		o.Development = false
		encCfg := zap2.NewProductionEncoderConfig()
		encCfg.EncodeTime = zapcore.ISO8601TimeEncoder
		o.Encoder = zapcore.NewJSONEncoder(encCfg)
	}
	ctrl.SetLogger(zapr.NewLogger(zap.NewRaw(o)))
	klog.SetLogger(ctrl.Log)

	printVersion()

	watchNamespace := os.Getenv(cnst.EnvWatchNamespace)
	podNamespace := os.Getenv(cnst.EnvPodNamespace)

	defaultNamespaces := map[string]crtlcache.Config{
		watchNamespace: {},
	}
	if watchNamespace == "" {
		defaultNamespaces = nil
	}

	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
		Scheme: scheme,
		Metrics: server.Options{
			BindAddress: metricsAddr,
		},
		WebhookServer: webhook.NewServer(webhook.Options{
			Port:    9443,
			CertDir: "certs",
		}),
		LeaderElection:             enableLeaderElection && !enableLoggerMode,
		LeaderElectionID:           "leader.eventlogger.bakito.ch",
		LeaderElectionResourceLock: os.Getenv(cnst.EnvLeaderElectionResourceLock),
		HealthProbeBindAddress:     healthAddr,
		Cache: crtlcache.Options{
			DefaultNamespaces: defaultNamespaces,
		},
	})
	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}

	if enableLoggerMode {
		setupLog.WithValues("configName", configName).Info("Current configuration")
		if err = (&logging.Reconciler{
			Client:     mgr.GetClient(),
			Log:        ctrl.Log.WithName("controllers").WithName("Event"),
			Scheme:     mgr.GetScheme(),
			Config:     logging.ConfigFor(configName, podNamespace, watchNamespace),
			LoggerMode: true,
		}).SetupWithManager(mgr, watchNamespace); err != nil {
			setupLog.Error(err, "unable to create controller", "controller", "Event")
			os.Exit(1)
		}
	} else {
		// Setup all Controllers
		if watchNamespace == "" {
			cr := &config.Reconciler{
				Reader: mgr.GetAPIReader(),
				Log:    ctrl.Log.WithName("controllers").WithName("Config"),
				Scheme: mgr.GetScheme(),
			}
			if err = (cr).SetupWithManager(mgr); err != nil {
				setupLog.Error(err, "unable to create controller", "controller", "Config")
				os.Exit(1)
			}
			if err = (&setup.Reconciler{
				Client: mgr.GetClient(),
				Log:    ctrl.Log.WithName("controllers").WithName("EventLogger"),
				Scheme: mgr.GetScheme(),
				Config: cr.Ctx(),
			}).SetupWithManager(mgr); err != nil {
				setupLog.Error(err, "unable to create controller", "controller", "EventLogger")
				os.Exit(1)
			}
			setupLog.Info("Running in global mode.")

			if os.Getenv(cnst.EnvEnableWebhook) != "false" {
				if err = (&eventloggerv1.EventLogger{}).SetupWebhookWithManager(mgr); err != nil {
					setupLog.Error(err, "unable to create webhook", "webhook", "EventLogger")
					os.Exit(1)
				}
			}
		} else {
			if err = (&logging.Reconciler{
				Client:     mgr.GetClient(),
				Log:        ctrl.Log.WithName("controllers").WithName("Event"),
				Scheme:     mgr.GetScheme(),
				Config:     logging.ConfigFor(configName, podNamespace, watchNamespace),
				LoggerMode: false,
			}).SetupWithManager(mgr, watchNamespace); err != nil {
				setupLog.Error(err, "unable to create controller", "controller", "Event")
				os.Exit(1)
			}
			setupLog.WithValues("namespace", watchNamespace).Info("Running in single namespace mode.")
		}
	}
	// +kubebuilder:scaffold:builder

	if enableProfiling {
		if err = mgr.Add(pprof.New(profilingAddr)); err != nil {
			setupLog.Error(err, "unable to create pprof service")
			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)
	}

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

func printVersion() {
	setupLog.Info(fmt.Sprintf("Operator Version: %s", version.Version))
	setupLog.Info(fmt.Sprintf("Go Version: %s", gr.Version()))
	setupLog.Info(fmt.Sprintf("Go OS/Arch: %s/%s", gr.GOOS, gr.GOARCH))
}