loki/operator/main.go

package main

import (
	"flag"
	"net/http"
	"net/http/pprof"
	"os"

	"github.com/ViaQ/logerr/v2/kverrors"
	"github.com/ViaQ/logerr/v2/log"

	// Import all Kubernetes client auth plugins (e.g. Azure, GCP, OIDC, etc.)
	// to ensure that exec-entrypoint and run can make use of them.
	_ "k8s.io/client-go/plugin/pkg/client/auth"

	configv1 "github.com/openshift/api/config/v1"
	routev1 "github.com/openshift/api/route/v1"
	monitoringv1 "github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring/v1"

	ctrlconfigv1 "github.com/grafana/loki/operator/apis/config/v1"
	lokiv1beta1 "github.com/grafana/loki/operator/apis/loki/v1beta1"
	lokictrl "github.com/grafana/loki/operator/controllers/loki"
	"github.com/grafana/loki/operator/internal/manifests"
	"github.com/grafana/loki/operator/internal/metrics"

	"k8s.io/apimachinery/pkg/runtime"
	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/healthz"
	// +kubebuilder:scaffold:imports
)

var scheme = runtime.NewScheme()

func init() {
	utilruntime.Must(clientgoscheme.AddToScheme(scheme))

	utilruntime.Must(lokiv1beta1.AddToScheme(scheme))

	utilruntime.Must(ctrlconfigv1.AddToScheme(scheme))
	// +kubebuilder:scaffold:scheme
}

func main() {
	var configFile string
	flag.StringVar(&configFile, "config", "",
		"The controller will load its initial configuration from this file. "+
			"Omit this flag to use the default configuration values. "+
			"Command-line flags override configuration from this file.",
	)
	flag.Parse()

	logger := log.NewLogger("loki-operator")
	ctrl.SetLogger(logger)

	var err error

	ctrlCfg := ctrlconfigv1.ProjectConfig{}
	options := ctrl.Options{Scheme: scheme}
	if configFile != "" {
		options, err = options.AndFrom(ctrl.ConfigFile().AtPath(configFile).OfKind(&ctrlCfg))
		if err != nil {
			logger.Error(err, "failed to parse controller manager config file")
			os.Exit(1)
		}
	}

	if ctrlCfg.Flags.EnablePrometheusAlerts && !ctrlCfg.Flags.EnableServiceMonitors {
		logger.Error(kverrors.New("enablePrometheusAlerts flag requires enableServiceMonitors"), "")
		os.Exit(1)
	}

	if ctrlCfg.Flags.EnableServiceMonitors || ctrlCfg.Flags.EnableTLSServiceMonitorConfig {
		utilruntime.Must(monitoringv1.AddToScheme(scheme))
	}

	if ctrlCfg.Flags.EnableGateway {
		utilruntime.Must(configv1.AddToScheme(scheme))

		if ctrlCfg.Flags.EnableGatewayRoute {
			utilruntime.Must(routev1.AddToScheme(scheme))
		}
	}

	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), options)
	if err != nil {
		logger.Error(err, "unable to start manager")
		os.Exit(1)
	}

	featureFlags := manifests.FeatureFlags{
		EnableCertificateSigningService: ctrlCfg.Flags.EnableCertificateSigningService,
		EnableServiceMonitors:           ctrlCfg.Flags.EnableServiceMonitors,
		EnableTLSServiceMonitorConfig:   ctrlCfg.Flags.EnableTLSServiceMonitorConfig,
		EnableTLSGRPCServices:           ctrlCfg.Flags.EnableTLSGRPCServices,
		EnablePrometheusAlerts:          ctrlCfg.Flags.EnablePrometheusAlerts,
		EnableGateway:                   ctrlCfg.Flags.EnableGateway,
		EnableGatewayRoute:              ctrlCfg.Flags.EnableGatewayRoute,
		EnableGrafanaLabsStats:          ctrlCfg.Flags.EnableGrafanaLabsStats,
	}

	if err = (&lokictrl.LokiStackReconciler{
		Client: mgr.GetClient(),
		Log:    logger.WithName("controllers").WithName("LokiStack"),
		Scheme: mgr.GetScheme(),
		Flags:  featureFlags,
	}).SetupWithManager(mgr); err != nil {
		logger.Error(err, "unable to create controller", "controller", "LokiStack")
		os.Exit(1)
	}
	if ctrlCfg.Flags.EnableLokiStackWebhook {
		if err = (&lokiv1beta1.LokiStack{}).SetupWebhookWithManager(mgr); err != nil {
			logger.Error(err, "unable to create webhook", "webhook", "LokiStack")
			os.Exit(1)
		}
	}
	if err = (&lokictrl.AlertingRuleReconciler{
		Client: mgr.GetClient(),
		Log:    logger.WithName("controllers").WithName("AlertingRule"),
		Scheme: mgr.GetScheme(),
	}).SetupWithManager(mgr); err != nil {
		logger.Error(err, "unable to create controller", "controller", "AlertingRule")
		os.Exit(1)
	}
	if ctrlCfg.Flags.EnableAlertingRuleWebhook {
		if err = (&lokiv1beta1.AlertingRule{}).SetupWebhookWithManager(mgr); err != nil {
			logger.Error(err, "unable to create webhook", "webhook", "AlertingRule")
			os.Exit(1)
		}
	}
	if err = (&lokictrl.RecordingRuleReconciler{
		Client: mgr.GetClient(),
		Log:    logger.WithName("controllers").WithName("RecordingRule"),
		Scheme: mgr.GetScheme(),
	}).SetupWithManager(mgr); err != nil {
		logger.Error(err, "unable to create controller", "controller", "RecordingRule")
		os.Exit(1)
	}
	if ctrlCfg.Flags.EnableRecordingRuleWebhook {
		if err = (&lokiv1beta1.RecordingRule{}).SetupWebhookWithManager(mgr); err != nil {
			logger.Error(err, "unable to create webhook", "webhook", "RecordingRule")
			os.Exit(1)
		}
	}
	if err = (&lokictrl.RulerConfigReconciler{
		Client: mgr.GetClient(),
		Scheme: mgr.GetScheme(),
	}).SetupWithManager(mgr); err != nil {
		logger.Error(err, "unable to create controller", "controller", "RulerConfig")
		os.Exit(1)
	}
	// +kubebuilder:scaffold:builder

	if err = mgr.AddHealthzCheck("health", healthz.Ping); err != nil {
		logger.Error(err, "unable to set up health check")
		os.Exit(1)
	}
	if err = mgr.AddReadyzCheck("check", healthz.Ping); err != nil {
		logger.Error(err, "unable to set up ready check")
		os.Exit(1)
	}

	logger.Info("registering metrics")
	metrics.RegisterMetricCollectors()

	logger.Info("Registering profiling endpoints.")
	err = registerProfiler(mgr)
	if err != nil {
		logger.Error(err, "failed to register extra pprof handler")
		os.Exit(1)
	}

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

func registerProfiler(m ctrl.Manager) error {
	endpoints := map[string]http.HandlerFunc{
		"/debug/pprof/":        pprof.Index,
		"/debug/pprof/cmdline": pprof.Cmdline,
		"/debug/pprof/profile": pprof.Profile,
		"/debug/pprof/symbol":  pprof.Symbol,
		"/debug/pprof/trace":   pprof.Trace,
	}

	for path, handler := range endpoints {
		err := m.AddMetricsExtraHandler(path, handler)
		if err != nil {
			return err
		}
	}

	return nil
}