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/
main.go
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/
main.go
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/*
Copyright 2023.
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"
"sync"
"syscall"
"time"
sourcev1 "github.com/fluxcd/source-controller/api/v1"
"github.com/go-logr/logr"
"github.com/spf13/pflag"
corev1 "k8s.io/api/core/v1"
apiextensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/types"
_ "k8s.io/client-go/plugin/pkg/client/auth"
cliflag "k8s.io/component-base/cli/flag"
"k8s.io/klog/v2"
clusterv1 "sigs.k8s.io/cluster-api/api/v1beta1"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/cache"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller"
"sigs.k8s.io/controller-runtime/pkg/healthz"
metricsserver "sigs.k8s.io/controller-runtime/pkg/metrics/server"
"sigs.k8s.io/controller-runtime/pkg/webhook"
//+kubebuilder:scaffold:imports
"github.com/projectsveltos/addon-compliance-controller/controllers"
libsveltosv1alpha1 "github.com/projectsveltos/libsveltos/api/v1alpha1"
"github.com/projectsveltos/libsveltos/lib/crd"
"github.com/projectsveltos/libsveltos/lib/logsettings"
libsveltosset "github.com/projectsveltos/libsveltos/lib/set"
)
var (
setupLog = ctrl.Log.WithName("setup")
metricsAddr string
probeAddr string
workers int
concurrentReconciles int
restConfigQPS float32
restConfigBurst int
webhookPort int
syncPeriod time.Duration
)
const (
defaultReconcilers = 10
defaultWorkers = 20
)
func main() {
scheme, err := controllers.InitScheme()
if err != nil {
os.Exit(1)
}
klog.InitFlags(nil)
initFlags(pflag.CommandLine)
pflag.CommandLine.SetNormalizeFunc(cliflag.WordSepNormalizeFunc)
pflag.CommandLine.AddGoFlagSet(flag.CommandLine)
pflag.Parse()
ctrl.SetLogger(klog.Background())
ctrlOptions := ctrl.Options{
Scheme: scheme,
HealthProbeBindAddress: probeAddr,
Metrics: metricsserver.Options{
BindAddress: metricsAddr,
},
WebhookServer: webhook.NewServer(
webhook.Options{
Port: webhookPort,
}),
Cache: cache.Options{
SyncPeriod: &syncPeriod,
},
}
restConfig := ctrl.GetConfigOrDie()
restConfig.QPS = restConfigQPS
restConfig.Burst = restConfigBurst
mgr, err := ctrl.NewManager(restConfig, ctrlOptions)
if err != nil {
setupLog.Error(err, "unable to start manager")
os.Exit(1)
}
// Setup the context that's going to be used in controllers and for the manager.
ctx := ctrl.SetupSignalHandler()
logsettings.RegisterForLogSettings(ctx,
libsveltosv1alpha1.ComponentAddonComplianceManager, ctrl.Log.WithName("log-setter"),
ctrl.GetConfigOrDie())
var addonConstraintController controller.Controller
addonConstraintReconciler := (&controllers.AddonComplianceReconciler{
Client: mgr.GetClient(),
Scheme: mgr.GetScheme(),
AddonCompliances: make(map[types.NamespacedName]libsveltosv1alpha1.Selector),
ClusterLabels: make(map[corev1.ObjectReference]map[string]string),
ClusterMap: make(map[corev1.ObjectReference]*libsveltosset.Set),
AddonComplianceToClusterMap: make(map[types.NamespacedName]*libsveltosset.Set),
ReferenceMap: make(map[corev1.ObjectReference]*libsveltosset.Set),
AddonComplianceToReferenceMap: make(map[types.NamespacedName]*libsveltosset.Set),
PolicyMux: sync.Mutex{},
ConcurrentReconciles: concurrentReconciles,
})
addonConstraintController, err = addonConstraintReconciler.SetupWithManager(mgr)
if err != nil {
setupLog.Error(err, "unable to create controller", "controller", "AddonCompliance")
os.Exit(1)
}
if err = (&controllers.SveltosClusterReconciler{
Client: mgr.GetClient(),
Scheme: mgr.GetScheme(),
}).SetupWithManager(mgr); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "SveltosCluster")
os.Exit(1)
}
//+kubebuilder:scaffold:builder
setupChecks(mgr)
go capiWatchers(ctx, mgr,
addonConstraintReconciler, addonConstraintController,
setupLog)
go fluxWatchers(ctx, mgr,
addonConstraintReconciler, addonConstraintController,
setupLog)
setupLog.Info("starting manager")
if err := mgr.Start(ctx); err != nil {
setupLog.Error(err, "problem running manager")
os.Exit(1)
}
}
func initFlags(fs *pflag.FlagSet) {
fs.StringVar(&metricsAddr,
"metrics-bind-address",
":8080",
"The address the metric endpoint binds to.")
fs.StringVar(&probeAddr,
"health-probe-bind-address",
":8081",
"The address the probe endpoint binds to.")
fs.IntVar(
&workers,
"worker-number",
defaultWorkers,
"Number of worker. Workers are used to deploy features in CAPI clusters")
fs.IntVar(
&concurrentReconciles,
"concurrent-reconciles",
defaultReconcilers,
"concurrent reconciles is the maximum number of concurrent Reconciles which can be run. Defaults to 10")
const defautlRestConfigQPS = 20
fs.Float32Var(&restConfigQPS, "kube-api-qps", defautlRestConfigQPS,
fmt.Sprintf("Maximum queries per second from the controller client to the Kubernetes API server. Defaults to %d",
defautlRestConfigQPS))
const defaultRestConfigBurst = 30
fs.IntVar(&restConfigBurst, "kube-api-burst", defaultRestConfigBurst,
fmt.Sprintf("Maximum number of queries that should be allowed in one burst from the controller client to the Kubernetes API server. Default %d",
defaultRestConfigBurst))
const defaultWebhookPort = 9443
fs.IntVar(&webhookPort, "webhook-port", defaultWebhookPort,
"Webhook Server port")
const defaultSyncPeriod = 10
fs.DurationVar(&syncPeriod, "sync-period", defaultSyncPeriod*time.Minute,
fmt.Sprintf("The minimum interval at which watched resources are reconciled (e.g. 15m). Default: %d minutes",
defaultSyncPeriod))
}
func setupChecks(mgr ctrl.Manager) {
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)
}
}
// fluxCRDHandler restarts process if a Flux CRD is updated
func fluxCRDHandler(gvk *schema.GroupVersionKind) {
if gvk.Group == sourcev1.GroupVersion.Group {
if killErr := syscall.Kill(syscall.Getpid(), syscall.SIGTERM); killErr != nil {
panic("kill -TERM failed")
}
}
}
// isFluxInstalled returns true if Flux is installed, false otherwise
func isFluxInstalled(ctx context.Context, c client.Client) (bool, error) {
gitRepositoryCRD := &apiextensionsv1.CustomResourceDefinition{}
err := c.Get(ctx, types.NamespacedName{Name: "gitrepositories.source.toolkit.fluxcd.io"},
gitRepositoryCRD)
if err != nil {
if apierrors.IsNotFound(err) {
return false, nil
}
return false, err
}
return true, nil
}
func fluxWatchers(ctx context.Context, mgr ctrl.Manager,
addonConstraintReconciler *controllers.AddonComplianceReconciler, addonConstraintController controller.Controller,
logger logr.Logger) {
const maxRetries = 20
retries := 0
for {
fluxPresent, err := isFluxInstalled(ctx, mgr.GetClient())
if err != nil {
if retries < maxRetries {
logger.Info(fmt.Sprintf("failed to verify if Flux is present: %v", err))
time.Sleep(time.Second)
}
retries++
} else {
if !fluxPresent {
setupLog.V(logsettings.LogInfo).Info("Flux currently not present. Starting CRD watcher")
go crd.WatchCustomResourceDefinition(ctx, mgr.GetConfig(), fluxCRDHandler, setupLog)
} else {
setupLog.V(logsettings.LogInfo).Info("Flux present.")
err = addonConstraintReconciler.WatchForFlux(mgr, addonConstraintController)
if err != nil {
continue
}
}
return
}
}
}
// capiCRDHandler restarts process if a CAPI CRD is updated
func capiCRDHandler(gvk *schema.GroupVersionKind) {
if gvk.Group == clusterv1.GroupVersion.Group {
if killErr := syscall.Kill(syscall.Getpid(), syscall.SIGTERM); killErr != nil {
panic("kill -TERM failed")
}
}
}
// isCAPIInstalled returns true if CAPI is installed, false otherwise
func isCAPIInstalled(ctx context.Context, c client.Client) (bool, error) {
clusterCRD := &apiextensionsv1.CustomResourceDefinition{}
err := c.Get(ctx, types.NamespacedName{Name: "clusters.cluster.x-k8s.io"}, clusterCRD)
if err != nil {
if apierrors.IsNotFound(err) {
return false, nil
}
return false, err
}
return true, nil
}
func capiWatchers(ctx context.Context, mgr ctrl.Manager,
addonConstraintReconciler *controllers.AddonComplianceReconciler, addonConstraintController controller.Controller,
logger logr.Logger) {
const maxRetries = 20
retries := 0
for {
capiPresent, err := isCAPIInstalled(ctx, mgr.GetClient())
if err != nil {
if retries < maxRetries {
logger.Info(fmt.Sprintf("failed to verify if CAPI is present: %v", err))
time.Sleep(time.Second)
}
retries++
} else {
if !capiPresent {
setupLog.V(logsettings.LogInfo).Info("CAPI currently not present. Starting CRD watcher")
go crd.WatchCustomResourceDefinition(ctx, mgr.GetConfig(), capiCRDHandler, setupLog)
} else {
setupLog.V(logsettings.LogInfo).Info("CAPI present.")
err = addonConstraintReconciler.WatchForCAPI(mgr, addonConstraintController)
if err != nil {
continue
}
if err = (&controllers.ClusterReconciler{
Client: mgr.GetClient(),
Scheme: mgr.GetScheme(),
}).SetupWithManager(mgr); err != nil {
setupLog.Error(err, "unable to create controller", "controller", "Cluster")
os.Exit(1)
}
}
return
}
}
}