main.go

package main

import (
	"flag"
	"os"

	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/client-go/discovery"
	cacheddiscovery "k8s.io/client-go/discovery/cached"
	"k8s.io/client-go/dynamic"
	"k8s.io/client-go/kubernetes"
	_ "k8s.io/client-go/plugin/pkg/client/auth" // Needed for misc auth.
	_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
	"k8s.io/client-go/tools/clientcmd"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/log/zap"

	workv1alpha1 "github.com/vllry/cluster-reconciler/pkg/api/v1alpha1"
	"github.com/vllry/cluster-reconciler/pkg/controllers"
	"github.com/vllry/cluster-reconciler/pkg/restmapper"
)

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

func init() {
	_ = workv1alpha1.AddToScheme(scheme)
}

func main() {
	ctrl.SetLogger(zap.New(zap.UseDevMode(true)))
	var metricsAddr string
	flag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.")

	var spokeKubeconfig string
	flag.StringVar(&spokeKubeconfig, "spoke-kubeconfig", "", "The kubeconfig to connect to spoke cluster to apply resources")
	flag.Parse()

	config, err := clientcmd.BuildConfigFromFlags("", spokeKubeconfig)
	if err != nil {
		setupLog.Error(err, "Unable to get spoke kube config.")
		os.Exit(1)
	}
	client, err := kubernetes.NewForConfig(config)
	if err != nil {
		setupLog.Error(err, "Unable to create spoke kube client.")
		os.Exit(1)
	}
	dynamicClient, err := dynamic.NewForConfig(config)
	if err != nil {
		setupLog.Error(err, "Unable to create spoke dynamic client.")
		os.Exit(1)
	}
	discoveryClient, err := discovery.NewDiscoveryClientForConfig(config)
	if err != nil {
		setupLog.Error(err, "Unable to create spoke dynamic client.")
		os.Exit(1)
	}

	startManager(metricsAddr, client, dynamicClient, discoveryClient)
}

func startManager(metricsAddr string, kubeClient kubernetes.Interface, dynamicClient dynamic.Interface, discoveryClient discovery.DiscoveryInterface) {

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

	stopCh := ctrl.SetupSignalHandler()

	cachedSpokeDiscoveryClient := cacheddiscovery.NewMemCacheClient(discoveryClient)
	restMapper := restmapper.NewMapper(cachedSpokeDiscoveryClient)
	go restMapper.Run(stopCh)

	// Add controller into manager
	workReconciler := &controllers.WorkReconciler{
		Client:             mgr.GetClient(),
		Log:                ctrl.Log.WithName("controllers").WithName("Work"),
		Scheme:             mgr.GetScheme(),
		SpokeKubeClient:    kubeClient,
		SpokeDynamicClient: dynamicClient,
		RestMapper:         restMapper,
	}

	if err = workReconciler.SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "Work")
		os.Exit(1)
	}

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