main.go

package main

import (
	"context"
	"flag"
	"fmt"
	"os"
	"runtime"

	// Import all Kubernetes client auth plugins (e.g. Azure, GCP, OIDC, etc.)
	_ "k8s.io/client-go/plugin/pkg/client/auth"
	"k8s.io/client-go/rest"

	"github.com/openshift/managed-velero-operator/pkg/apis"
	"github.com/openshift/managed-velero-operator/pkg/controller"
	"github.com/openshift/managed-velero-operator/pkg/util/platform"
	"github.com/openshift/managed-velero-operator/pkg/velero"
	"github.com/openshift/managed-velero-operator/version"

	"github.com/operator-framework/operator-sdk/pkg/k8sutil"
	kubemetrics "github.com/operator-framework/operator-sdk/pkg/kube-metrics"
	"github.com/operator-framework/operator-sdk/pkg/leader"
	"github.com/operator-framework/operator-sdk/pkg/log/zap"
	"github.com/operator-framework/operator-sdk/pkg/metrics"
	"github.com/operator-framework/operator-sdk/pkg/restmapper"
	sdkVersion "github.com/operator-framework/operator-sdk/version"
	"github.com/spf13/pflag"
	v1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/util/intstr"
	crclient "sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/client/config"
	"sigs.k8s.io/controller-runtime/pkg/manager"
	logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
	"sigs.k8s.io/controller-runtime/pkg/runtime/signals"

	velerov1 "github.com/heptio/velero/pkg/apis/velero/v1"
	configv1 "github.com/openshift/api/config/v1"
	minterv1 "github.com/openshift/cloud-credential-operator/pkg/apis/cloudcredential/v1"
	apiextv1beta1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1"
)

// Change below variables to serve metrics on different host or port.
var (
	metricsHost               = "0.0.0.0"
	metricsPort         int32 = 8383
	operatorMetricsPort int32 = 8686
)

var log = logf.Log.WithName(version.OperatorName)

const ManagedVeleroOperatorNamespace = "openshift-velero"

// supportedPlatforms is the list of platform supported by the operator
var supportedPlatforms = []configv1.PlatformType{configv1.AWSPlatformType}

func printVersion() {
	log.Info(fmt.Sprintf("Go Version: %s", runtime.Version()))
	log.Info(fmt.Sprintf("Go OS/Arch: %s/%s", runtime.GOOS, runtime.GOARCH))
	log.Info(fmt.Sprintf("Version of operator-sdk: %v", sdkVersion.Version))
}

func main() {
	// Add the zap logger flag set to the CLI. The flag set must
	// be added before calling pflag.Parse().
	pflag.CommandLine.AddFlagSet(zap.FlagSet())

	// Add flags registered by imported packages (e.g. glog and
	// controller-runtime)
	pflag.CommandLine.AddGoFlagSet(flag.CommandLine)

	pflag.Parse()

	// Use a zap logr.Logger implementation. If none of the zap
	// flags are configured (or if the zap flag set is not being
	// used), this defaults to a production zap logger.
	//
	// The logger instantiated here can be changed to any logger
	// implementing the logr.Logger interface. This logger will
	// be propagated through the whole operator, generating
	// uniform and structured logs.
	logf.SetLogger(zap.Logger())

	printVersion()

	namespace, err := k8sutil.GetOperatorNamespace()
	if err != nil {
		log.Error(err, "Failed to get operator namespace")
		os.Exit(1)
	}

	// The operator makes assumptions about the namespace to configure Velero in.
	// If the operator is deployed in a different namespace than expected, error.
	if namespace != ManagedVeleroOperatorNamespace {
		log.Error(fmt.Errorf("unexpected operator namespace: expected %s, got %s", ManagedVeleroOperatorNamespace, namespace), "")
		os.Exit(1)
	}

	// Get a config to talk to the apiserver
	cfg, err := config.GetConfig()
	if err != nil {
		log.Error(err, "")
		os.Exit(1)
	}

	ctx := context.TODO()
	// Become the leader before proceeding
	err = leader.Become(ctx, "managed-velero-operator-lock")
	if err != nil {
		log.Error(err, "")
		os.Exit(1)
	}

	// Create a new Cmd to provide shared dependencies and start components
	mgr, err := manager.New(cfg, manager.Options{
		Namespace:          namespace,
		MapperProvider:     restmapper.NewDynamicRESTMapper,
		MetricsBindAddress: fmt.Sprintf("%s:%d", metricsHost, metricsPort),
	})
	if err != nil {
		log.Error(err, "")
		os.Exit(1)
	}

	log.Info("Registering Components.")

	// Setup Scheme for all resources
	if err := apis.AddToScheme(mgr.GetScheme()); err != nil {
		log.Error(err, "")
		os.Exit(1)
	}

	// Add Custom Resource apis to scheme
	if err := apiextv1beta1.AddToScheme(mgr.GetScheme()); err != nil {
		log.Error(err, "")
		os.Exit(1)
	}

	// Add OpenShift config apis to scheme
	if err := configv1.Install(mgr.GetScheme()); err != nil {
		log.Error(err, "")
		os.Exit(1)
	}

	// Add Cloud Credential apis to scheme
	if err := minterv1.AddToScheme(mgr.GetScheme()); err != nil {
		log.Error(err, "")
		os.Exit(1)
	}

	// Add Velero apis to scheme
	if err := velerov1.SchemeBuilder.AddToScheme(mgr.GetScheme()); err != nil {
		log.Error(err, "")
		os.Exit(1)
	}

	// Create k8s client to perform startup tasks
	startupClient, err := crclient.New(cfg, crclient.Options{Scheme: mgr.GetScheme()})
	if err != nil {
		log.Error(err, "Unable to create operator startup client")
		os.Exit(1)
	}

	// Grab platform status to determine where OpenShift is installed
	platformStatus, err := platform.GetPlatformStatus(startupClient)
	if err != nil {
		log.Error(err, "Failed to retrieve platform status")
		os.Exit(1)
	}

	// Verify platform is in support platforms list
	// TODO: expand support to other platforms
	if !platform.IsPlatformSupported(platformStatus.Type, supportedPlatforms) {
		log.Error(fmt.Errorf("expected %v got %v", supportedPlatforms, platformStatus.Type), "Unsupported platform")
		os.Exit(1)
	}

	// Verify all velero CRDs are installed
	if err = velero.InstallVeleroCRDs(log, startupClient); err != nil {
		log.Error(err, "Failed to install Velero CRDs")
		os.Exit(1)
	}

	// Setup all Controllers
	if err := controller.AddToManager(mgr); err != nil {
		log.Error(err, "")
		os.Exit(1)
	}

	if err = serveCRMetrics(cfg); err != nil {
		log.Info("Could not generate and serve custom resource metrics", "error", err.Error())
	}

	// Add to the below struct any other metrics ports you want to expose.
	servicePorts := []v1.ServicePort{
		{Port: metricsPort, Name: metrics.OperatorPortName, Protocol: v1.ProtocolTCP, TargetPort: intstr.IntOrString{Type: intstr.Int, IntVal: metricsPort}},
		{Port: operatorMetricsPort, Name: metrics.CRPortName, Protocol: v1.ProtocolTCP, TargetPort: intstr.IntOrString{Type: intstr.Int, IntVal: operatorMetricsPort}},
	}
	// Create Service object to expose the metrics port(s).
	service, err := metrics.CreateMetricsService(ctx, cfg, servicePorts)
	if err != nil {
		log.Info("Could not create metrics Service", "error", err.Error())
	}

	// CreateServiceMonitors will automatically create the prometheus-operator ServiceMonitor resources
	// necessary to configure Prometheus to scrape metrics from this operator.
	services := []*v1.Service{service}
	_, err = metrics.CreateServiceMonitors(cfg, namespace, services)
	if err != nil {
		log.Info("Could not create ServiceMonitor object", "error", err.Error())
		// If this operator is deployed to a cluster without the prometheus-operator running, it will return
		// ErrServiceMonitorNotPresent, which can be used to safely skip ServiceMonitor creation.
		if err == metrics.ErrServiceMonitorNotPresent {
			log.Info("Install prometheus-operator in your cluster to create ServiceMonitor objects", "error", err.Error())
		}
	}

	log.Info("Starting the Cmd.")

	// Start the Cmd
	if err := mgr.Start(signals.SetupSignalHandler()); err != nil {
		log.Error(err, "Manager exited non-zero")
		os.Exit(1)
	}
}

// serveCRMetrics gets the Operator/CustomResource GVKs and generates metrics based on those types.
// It serves those metrics on "http://metricsHost:operatorMetricsPort".
func serveCRMetrics(cfg *rest.Config) error {
	// Below function returns filtered operator/CustomResource specific GVKs.
	// For more control override the below GVK list with your own custom logic.
	filteredGVK, err := k8sutil.GetGVKsFromAddToScheme(apis.AddToScheme)
	if err != nil {
		return err
	}
	// Get the namespace the operator is currently deployed in.
	operatorNs, err := k8sutil.GetOperatorNamespace()
	if err != nil {
		return err
	}
	// To generate metrics in other namespaces, add the values below.
	ns := []string{operatorNs}
	// Generate and serve custom resource specific metrics.
	err = kubemetrics.GenerateAndServeCRMetrics(cfg, ns, filteredGVK, metricsHost, operatorMetricsPort)
	if err != nil {
		return err
	}
	return nil
}