main.go

/*
Copyright 2022.

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 (
	"context"
	"flag"
	"fmt"
	"os"
	"runtime"
	"strings"

	// 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"

	apiruntime "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/cache"
	"sigs.k8s.io/controller-runtime/pkg/healthz"
	logf "sigs.k8s.io/controller-runtime/pkg/log"
	"sigs.k8s.io/controller-runtime/pkg/log/zap"

	"github.com/openshift/must-gather-operator/config"
	"github.com/openshift/must-gather-operator/version"
	osdmetrics "github.com/openshift/operator-custom-metrics/pkg/metrics"
	"github.com/operator-framework/operator-lib/leader"
	"github.com/redhat-cop/operator-utils/pkg/util"

	v1 "github.com/openshift/api/config/v1"
	managedv1alpha1 "github.com/openshift/must-gather-operator/api/v1alpha1"
	"github.com/openshift/must-gather-operator/controllers/mustgather"
	"github.com/openshift/must-gather-operator/pkg/localmetrics"
	//+kubebuilder:scaffold:imports
)

const (
	// Environment variable to determine operator run mode
	ForceRunModeEnv = "OSDK_FORCE_RUN_MODE"
	// Flags that the operator is running locally
	LocalRunMode = "local"
	// Namespace for operator to watch
	namespace = "openshift-must-gather-operator"
)

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

// Change below variables to serve metrics on different host or port.
var (
	metricsPort = "8080"
	metricsPath = "/metrics"
)

var log = logf.Log.WithName("cmd")

func printVersion() {
	log.Info(fmt.Sprintf("Operator Version: %s", version.Version))
	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", version.SDKVersion))
}

func init() {
	utilruntime.Must(clientgoscheme.AddToScheme(scheme))
	utilruntime.Must(v1.AddToScheme(scheme))
	utilruntime.Must(managedv1alpha1.AddToScheme(scheme))
	//+kubebuilder:scaffold:scheme
}

func main() {
	// var metricsAddr string
	var enableLeaderElection bool
	var probeAddr string
	// flag.StringVar(&metricsAddr, "metrics-bind-address", ":8080", "The address the metric endpoint binds to.")
	flag.StringVar(&probeAddr, "health-probe-bind-address", ":8081", "The address the probe endpoint binds to.")
	flag.BoolVar(&enableLeaderElection, "leader-elect", false,
		"Enable leader election for controller manager. "+
			"Enabling this will ensure there is only one active controller manager.")
	opts := zap.Options{
		Development: true,
	}
	opts.BindFlags(flag.CommandLine)
	flag.Parse()

	ctrl.SetLogger(zap.New(zap.UseFlagOptions(&opts)))

	printVersion()

	options := ctrl.Options{
		Scheme:                 scheme,
		MetricsBindAddress:     "0", // metricsAddr,
		Port:                   9443,
		HealthProbeBindAddress: probeAddr,
		LeaderElection:         enableLeaderElection,
		LeaderElectionID:       "b15e5fc1.openshift.io",
		Cache: cache.Options{
			Namespaces: []string{namespace},
		},
	}

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

	ctx := context.TODO()

	// Become the leader before proceeding
	// This doesn't work locally, so only perform it when running on-cluster
	if strings.ToLower(os.Getenv(ForceRunModeEnv)) != LocalRunMode {
		err = leader.Become(ctx, "must-gather-operator-lock")
		if err != nil {
			log.Error(err, "")
			os.Exit(1)
		}
	} else {
		setupLog.Info("bypassing leader election due to local execution")
	}

	if err = (&mustgather.MustGatherReconciler{
		ReconcilerBase: util.NewReconcilerBase(mgr.GetClient(), mgr.GetScheme(), mgr.GetConfig(), mgr.GetEventRecorderFor("must-gather-controller"), mgr.GetAPIReader()),
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "MustGather")
		os.Exit(1)
	}

	// addMetrics
	metricsServer := osdmetrics.NewBuilder(config.OperatorNamespace, config.OperatorName).
		WithPort(metricsPort).
		WithPath(metricsPath).
		WithCollectors(localmetrics.MetricsList).
		WithServiceMonitor().
		GetConfig()

	if err := osdmetrics.ConfigureMetrics(ctx, *metricsServer); err != nil {
		log.Error(err, "Failed to configure OSD metrics")
	}

	//+kubebuilder:scaffold:builder

	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)
	}
}