forked from openshift/cloud-credential-operator
/
awspodidentitywebhook_controller.go
349 lines (314 loc) · 10.9 KB
/
awspodidentitywebhook_controller.go
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package awspodidentity
import (
"context"
"fmt"
"os"
"time"
log "github.com/sirupsen/logrus"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
"k8s.io/utils/pointer"
"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/event"
"sigs.k8s.io/controller-runtime/pkg/handler"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/predicate"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"sigs.k8s.io/controller-runtime/pkg/source"
configv1 "github.com/openshift/api/config/v1"
"github.com/openshift/library-go/pkg/operator/events"
"github.com/openshift/library-go/pkg/operator/resource/resourceapply"
"github.com/openshift/library-go/pkg/operator/resource/resourceread"
"github.com/openshift/cloud-credential-operator/pkg/assets/v410_00_assets"
"github.com/openshift/cloud-credential-operator/pkg/operator/platform"
"github.com/openshift/cloud-credential-operator/pkg/operator/status"
"github.com/openshift/cloud-credential-operator/pkg/operator/utils"
)
const (
controllerName = "awspodidentity"
deploymentName = "cloud-credential-operator"
operatorNamespace = "openshift-cloud-credential-operator"
retryInterval = 10 * time.Second
reasonStaticResourceReconcileFailed = "StaticResourceReconcileFailed"
)
var (
defaultCodecs = serializer.NewCodecFactory(scheme.Scheme)
defaultCodec = defaultCodecs.UniversalDeserializer()
staticFiles = []string{
"v4.1.0/aws-pod-identity-webhook/sa.yaml",
"v4.1.0/aws-pod-identity-webhook/clusterrole.yaml",
"v4.1.0/aws-pod-identity-webhook/role.yaml",
"v4.1.0/aws-pod-identity-webhook/clusterrolebinding.yaml",
"v4.1.0/aws-pod-identity-webhook/rolebinding.yaml",
"v4.1.0/aws-pod-identity-webhook/svc.yaml",
}
templateFiles = []string{
"v4.1.0/aws-pod-identity-webhook/deployment.yaml",
"v4.1.0/aws-pod-identity-webhook/mutatingwebhook.yaml",
"v4.1.0/aws-pod-identity-webhook/poddisruptionbudget.yaml",
}
relatedObjects = []configv1.ObjectReference{
{
Resource: "serviceaccounts",
Namespace: operatorNamespace,
Name: "pod-identity-webhook",
},
{
Group: "rbac.authorization.k8s.io",
Resource: "clusterroles",
Name: "pod-identity-webhook",
},
{
Group: "rbac.authorization.k8s.io",
Resource: "clusterrolebindings",
Name: "pod-identity-webhook",
},
{
Group: "rbac.authorization.k8s.io",
Resource: "roles",
Namespace: operatorNamespace,
Name: "pod-identity-webhook",
},
{
Group: "rbac.authorization.k8s.io",
Resource: "rolebindings",
Namespace: operatorNamespace,
Name: "pod-identity-webhook",
},
{
Resource: "services",
Namespace: operatorNamespace,
Name: "pod-identity-webhook",
},
{
Group: "apps",
Resource: "deployments",
Namespace: operatorNamespace,
Name: "pod-identity-webhook",
},
{
Group: "admissionregistration.k8s.io",
Resource: "mutatingwebhookconfigurations",
Name: "pod-identity-webhook",
},
}
)
type awsPodIdentityController struct {
reconciler *staticResourceReconciler
cache cache.Cache
logger log.FieldLogger
}
func (c *awsPodIdentityController) Start(ctx context.Context) error {
retryTimer := time.NewTimer(retryInterval)
for {
err := c.reconciler.ReconcileResources(ctx)
if err != nil {
retryTimer.Reset(retryInterval)
<-retryTimer.C
} else {
break
}
}
go c.cache.Start(ctx)
return nil
}
func Add(mgr manager.Manager, kubeconfig string) error {
infraStatus, err := platform.GetInfraStatusUsingKubeconfig(mgr, kubeconfig)
if err != nil {
return err
}
platformType := platform.GetType(infraStatus)
if platformType != configv1.AWSPlatformType {
return nil
}
log.Info("setting up AWS pod identity controller")
config := mgr.GetConfig()
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
return err
}
controllerRef := &corev1.ObjectReference{
Kind: "deployment",
Namespace: operatorNamespace,
Name: deploymentName,
}
eventRecorder := events.NewKubeRecorder(clientset.CoreV1().Events(operatorNamespace), deploymentName, controllerRef)
logger := log.WithFields(log.Fields{"controller": controllerName})
imagePullSpec := os.Getenv("AWS_POD_IDENTITY_WEBHOOK_IMAGE")
if len(imagePullSpec) == 0 {
logger.Warn("AWS_POD_IDENTITY_WEBHOOK_IMAGE is not set, AWS pod identity webhook will not be deployed")
return nil
}
r := &staticResourceReconciler{
client: mgr.GetClient(),
clientset: clientset,
logger: logger,
eventRecorder: eventRecorder,
imagePullSpec: imagePullSpec,
conditions: []configv1.ClusterOperatorStatusCondition{},
cache: resourceapply.NewResourceCache(),
}
c, err := controller.New(controllerName, mgr, controller.Options{Reconciler: r})
if err != nil {
return err
}
p := predicate.Funcs{
UpdateFunc: func(e event.UpdateEvent) bool {
return isManaged(e.ObjectNew)
},
CreateFunc: func(e event.CreateEvent) bool {
return isManaged(e.Object)
},
DeleteFunc: func(e event.DeleteEvent) bool {
return isManaged(e.Object)
},
}
// Create a namespace local cache separate from the Manager cache
// A namespace scoped cache can still handle cluster scoped resources
cache, err := cache.New(config, cache.Options{Namespace: operatorNamespace})
if err != nil {
return err
}
allFiles := append(staticFiles, templateFiles...)
for _, file := range allFiles {
objBytes := v410_00_assets.MustAsset(file)
obj, _, err := defaultCodec.Decode(objBytes, nil, nil)
if err != nil {
return err
}
co, ok := obj.(client.Object)
if !ok {
return fmt.Errorf("failed to convert runtime.Object to client.Object")
}
informer, err := cache.GetInformer(context.TODO(), co)
if err != nil {
return err
}
err = c.Watch(&source.Informer{Informer: informer}, &handler.EnqueueRequestForObject{}, p)
if err != nil {
return err
}
}
status.AddHandler(controllerName, r)
if err := mgr.Add(&awsPodIdentityController{reconciler: r, cache: cache, logger: logger}); err != nil {
return err
}
return nil
}
func isManaged(meta metav1.Object) bool {
// all managed resources are named pod-identity-webhook
if meta.GetName() == "pod-identity-webhook" {
return true
}
return false
}
type staticResourceReconciler struct {
client client.Client
clientset kubernetes.Interface
logger log.FieldLogger
eventRecorder events.Recorder
deploymentGeneration int64
imagePullSpec string
conditions []configv1.ClusterOperatorStatusCondition
cache resourceapply.ResourceCache
}
var _ reconcile.Reconciler = &staticResourceReconciler{}
func (r *staticResourceReconciler) Reconcile(ctx context.Context, request reconcile.Request) (reconcile.Result, error) {
r.logger.Debugf("reconciling after watch event %#v", request)
err := r.ReconcileResources(ctx)
if err != nil {
r.logger.Errorf("reconciliation failed, retrying in %s", retryInterval.String())
r.conditions = []configv1.ClusterOperatorStatusCondition{
{
Type: configv1.OperatorDegraded,
Status: configv1.ConditionTrue,
Reason: reasonStaticResourceReconcileFailed,
Message: fmt.Sprintf("static resource reconciliation failed: %v", err),
},
}
return reconcile.Result{RequeueAfter: retryInterval}, err
}
r.conditions = []configv1.ClusterOperatorStatusCondition{}
return reconcile.Result{}, nil
}
func (r *staticResourceReconciler) ReconcileResources(ctx context.Context) error {
topology, err := utils.LoadInfrastructureTopology(r.client, r.logger)
if err != nil {
return err
}
applyResults := resourceapply.ApplyDirectly(
ctx,
(&resourceapply.ClientHolder{}).WithKubernetes(r.clientset),
r.eventRecorder,
r.cache,
v410_00_assets.Asset,
staticFiles...,
)
for _, result := range applyResults {
if result.Error != nil {
r.logger.WithError(result.Error).Errorf("error reconciling %s", result.Type)
return result.Error
}
if !result.Changed {
continue
}
r.logger.Infof("%s reconciled successfully", result.Type)
}
// "v4.1.0/aws-pod-identity-webhook/deployment.yaml"
requestedDeployment := resourceread.ReadDeploymentV1OrDie(v410_00_assets.MustAsset("v4.1.0/aws-pod-identity-webhook/deployment.yaml"))
if topology == configv1.SingleReplicaTopologyMode {
// Set replicas=1 for deployment on single replica topology clusters
requestedDeployment.Spec.Replicas = pointer.Int32(1)
}
requestedDeployment.Spec.Template.Spec.Containers[0].Image = r.imagePullSpec
resultDeployment, modified, err := resourceapply.ApplyDeployment(ctx, r.clientset.AppsV1(), r.eventRecorder, requestedDeployment, r.deploymentGeneration)
if err != nil {
r.logger.WithError(err).Error("error applying Deployment")
return err
}
r.deploymentGeneration = resultDeployment.Generation
if modified {
r.logger.Infof("Deployment reconciled successfully")
}
// "v4.1.0/aws-pod-identity-webhook/mutatingwebhook.yaml"
requestedMutatingWebhookConfiguration := resourceread.ReadMutatingWebhookConfigurationV1OrDie(v410_00_assets.MustAsset("v4.1.0/aws-pod-identity-webhook/mutatingwebhook.yaml"))
_, modified, err = resourceapply.ApplyMutatingWebhookConfigurationImproved(context.TODO(), r.clientset.AdmissionregistrationV1(), r.eventRecorder, requestedMutatingWebhookConfiguration, r.cache)
if err != nil {
r.logger.WithError(err).Error("error applying MutatingWebhookConfiguration")
return err
}
if modified {
r.logger.Infof("MutatingWebhookConfiguration reconciled successfully")
}
if topology == configv1.SingleReplicaTopologyMode {
// Don't deploy the PDB to single replica topology clusters
r.logger.Debugf("not deploying PodDisruptionBudget to single replica topology")
} else {
// "v4.1.0/aws-pod-identity-webhook/poddisruptionbudget.yaml"
requestedPDB := resourceread.ReadPodDisruptionBudgetV1OrDie(v410_00_assets.MustAsset("v4.1.0/aws-pod-identity-webhook/poddisruptionbudget.yaml"))
_, modified, err = resourceapply.ApplyPodDisruptionBudget(context.TODO(), r.clientset.PolicyV1(), r.eventRecorder, requestedPDB)
if err != nil {
r.logger.WithError(err).Error("error applying PodDisruptionBudget")
return err
}
if modified {
r.logger.Infof("PodDisruptionBudget reconciled successfully")
}
}
return nil
}
var _ status.Handler = &staticResourceReconciler{}
func (r *staticResourceReconciler) GetConditions(logger log.FieldLogger) ([]configv1.ClusterOperatorStatusCondition, error) {
return r.conditions, nil
}
func (r *staticResourceReconciler) GetRelatedObjects(logger log.FieldLogger) ([]configv1.ObjectReference, error) {
return relatedObjects, nil
}
func (r *staticResourceReconciler) Name() string {
return controllerName
}