main.go

/*
Copyright 2025.

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"
	"os"
	"runtime"
	"time"

	"github.com/operator-framework/helm-operator-plugins/pkg/annotation"
	"github.com/operator-framework/helm-operator-plugins/pkg/reconciler"
	"github.com/operator-framework/helm-operator-plugins/pkg/watches"
	ctrlruntime "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"
	ctrl "sigs.k8s.io/controller-runtime"
	"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"
	//+kubebuilder:scaffold:imports
)

var (
	scheme                         = ctrlruntime.NewScheme()
	setupLog                       = ctrl.Log.WithName("setup")
	defaultMaxConcurrentReconciles = runtime.NumCPU()
	defaultReconcilePeriod         = time.Minute
	watchNamespace                 = os.Getenv("WATCH_NAMESPACE")
)

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

func main() {
	var (
		metricsAddr          string
		leaderElectionID     string
		watchesPath          string
		probeAddr            string
		enableLeaderElection bool
		development          bool
	)

	flag.StringVar(&metricsAddr, "metrics-bind-address", "0", "The address the metrics endpoint binds to. "+
		"Use :8443 for HTTPS or :8080 for HTTP, or leave as 0 to disable the metrics service.")
	flag.StringVar(&probeAddr, "health-probe-bind-address", ":8081", "The address the probe endpoint binds to.")
	flag.StringVar(&watchesPath, "watches-file", "watches.yaml", "path to watches file")
	flag.StringVar(&leaderElectionID, "leader-election-id", "195237d9.rhtpa-operator", "provide leader election")
	flag.BoolVar(&enableLeaderElection, "leader-elect", false,
		"Enable leader election for controller manager. Enabling this will ensure there is only one active controller manager.")
	flag.BoolVar(&development, "development", false, "Enable development log")
	opts := zap.Options{
		Development: development,
	}
	opts.BindFlags(flag.CommandLine)
	flag.Parse()

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

	var cacheOpts cache.Options
	if watchNamespace != "" {
		setupLog.Info("Watching specific namespace", "namespace", watchNamespace)
		cacheOpts = cache.Options{
			DefaultNamespaces: map[string]cache.Config{
				watchNamespace: {},
			},
		}
	} else {
		setupLog.Info("Watching all namespaces")
	}
	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
		Scheme: scheme,
		Metrics: server.Options{
			BindAddress: metricsAddr,
		},
		HealthProbeBindAddress: probeAddr,
		LeaderElection:         enableLeaderElection,
		LeaderElectionID:       leaderElectionID,
		Cache:                  cacheOpts,
	})

	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}
	//+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)
	}

	ws, err := watches.Load(watchesPath)
	if err != nil {
		setupLog.Error(err, "Failed to create new manager factories")
		os.Exit(1)
	}

	for _, w := range ws {
		reconcilePeriod := defaultReconcilePeriod
		if w.ReconcilePeriod != nil {
			reconcilePeriod = w.ReconcilePeriod.Duration
		}

		maxConcurrentReconciles := defaultMaxConcurrentReconciles
		if w.MaxConcurrentReconciles != nil {
			maxConcurrentReconciles = *w.MaxConcurrentReconciles
		}

		r, err := reconciler.New(
			reconciler.SkipDependentWatches(w.WatchDependentResources != nil && !*w.WatchDependentResources),
			reconciler.WithChart(*w.Chart),
			reconciler.WithGroupVersionKind(w.GroupVersionKind),
			reconciler.WithInstallAnnotations(annotation.DefaultInstallAnnotations...),
			reconciler.WithMaxConcurrentReconciles(maxConcurrentReconciles),
			reconciler.WithOverrideValues(w.OverrideValues),
			reconciler.WithReconcilePeriod(reconcilePeriod),
			reconciler.WithSelector(*w.Selector),
			reconciler.WithUpgradeAnnotations(annotation.DefaultUpgradeAnnotations...),
			reconciler.WithUninstallAnnotations(annotation.DefaultUninstallAnnotations...),
		)
		if err != nil {
			setupLog.Error(err, "unable to create helm reconciler", "controller", "Helm")
			os.Exit(1)
		}
		if err := r.SetupWithManager(mgr); err != nil {
			setupLog.Error(err, "unable to create controller", "controller", "Helm")
			os.Exit(1)
		}
		setupLog.Info("configured watch", "gvk", w.GroupVersionKind, "chartPath", w.ChartPath, "maxConcurrentReconciles", maxConcurrentReconciles, "reconcilePeriod", reconcilePeriod, "development", development)
	}

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