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controller.go
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controller.go
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/*
Copyright 2022 The Kubermatic Kubernetes Platform contributors.
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 applicationsecretsynchronizer
import (
"context"
"fmt"
"go.uber.org/zap"
"k8c.io/kubermatic/v2/pkg/controller/util/predicate"
kuberneteshelper "k8c.io/kubermatic/v2/pkg/kubernetes"
"k8c.io/reconciler/pkg/reconciling"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/tools/record"
ctrlruntimeclient "sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller"
"sigs.k8s.io/controller-runtime/pkg/handler"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"sigs.k8s.io/controller-runtime/pkg/source"
)
const (
ControllerName = "kkp-application-secret-synchronizer"
SecretTypeAnnotation = "apps.kubermatic.k8c.io/secret-type"
)
type reconciler struct {
log *zap.SugaredLogger
recorder record.EventRecorder
masterClient ctrlruntimeclient.Client
namespace string
seedClients kuberneteshelper.SeedClientMap
}
func Add(
masterManager manager.Manager,
seedManagers map[string]manager.Manager,
namespace string,
log *zap.SugaredLogger,
numWorkers int,
) error {
r := &reconciler{
log: log.Named(ControllerName),
recorder: masterManager.GetEventRecorderFor(ControllerName),
masterClient: masterManager.GetClient(),
seedClients: kuberneteshelper.SeedClientMap{},
namespace: namespace,
}
for seedName, seedManager := range seedManagers {
r.seedClients[seedName] = seedManager.GetClient()
}
c, err := controller.New(ControllerName, masterManager, controller.Options{Reconciler: r, MaxConcurrentReconciles: numWorkers})
if err != nil {
return fmt.Errorf("failed to construct controller: %w", err)
}
if err := c.Watch(source.Kind(masterManager.GetCache(), &corev1.Secret{}), &handler.EnqueueRequestForObject{}, predicate.ByAnnotation(SecretTypeAnnotation, "", false), predicate.ByNamespace(r.namespace)); err != nil {
return fmt.Errorf("failed to create watch for secrets: %w", err)
}
return nil
}
func (r *reconciler) Reconcile(ctx context.Context, request reconcile.Request) (reconcile.Result, error) {
log := r.log.With("secret", request)
log.Debug("Processing")
secret := &corev1.Secret{}
if err := r.masterClient.Get(ctx, request.NamespacedName, secret); err != nil {
if !apierrors.IsNotFound(err) {
return reconcile.Result{}, err
}
// handling deletion
delSecret := &corev1.Secret{ObjectMeta: metav1.ObjectMeta{Name: request.Name, Namespace: r.namespace}}
if err := r.handleDeletion(ctx, log, delSecret); err != nil {
err = fmt.Errorf("failed to delete secret: %w", err)
log.Errorw("ReconcilingError", zap.Error(err))
r.recorder.Event(delSecret, corev1.EventTypeWarning, "ReconcilingError", err.Error())
return reconcile.Result{}, err
}
return reconcile.Result{}, nil
}
err := r.reconcile(ctx, log, secret)
if err != nil {
r.recorder.Event(secret, corev1.EventTypeWarning, "ReconcilingError", err.Error())
}
return reconcile.Result{}, err
}
func (r *reconciler) reconcile(ctx context.Context, log *zap.SugaredLogger, secret *corev1.Secret) error {
seedsecret := secret.DeepCopy()
seedsecret.SetResourceVersion("")
namedSecretReconcilerFactory := []reconciling.NamedSecretReconcilerFactory{
secretReconcilerFactory(seedsecret),
}
err := r.seedClients.Each(ctx, log, func(_ string, seedClient ctrlruntimeclient.Client, log *zap.SugaredLogger) error {
seedSecret := &corev1.Secret{}
if err := seedClient.Get(ctx, ctrlruntimeclient.ObjectKeyFromObject(seedsecret), seedSecret); err != nil && !apierrors.IsNotFound(err) {
return fmt.Errorf("failed to fetch Secret on seed cluster: %w", err)
}
// see project-synchronizer's syncAllSeeds comment
if seedSecret.UID != "" && seedSecret.UID == seedsecret.UID {
return nil
}
return reconciling.ReconcileSecrets(ctx, namedSecretReconcilerFactory, r.namespace, seedClient)
})
if err != nil {
return fmt.Errorf("reconciling secret %s failed: %w", seedsecret.Name, err)
}
return nil
}
func secretReconcilerFactory(s *corev1.Secret) reconciling.NamedSecretReconcilerFactory {
return func() (name string, create reconciling.SecretReconciler) {
return s.Name, func(existing *corev1.Secret) (*corev1.Secret, error) {
existing.Labels = s.Labels
existing.Annotations = s.Annotations
existing.Data = s.Data
return existing, nil
}
}
}
func (r *reconciler) handleDeletion(ctx context.Context, log *zap.SugaredLogger, secret *corev1.Secret) error {
return r.seedClients.Each(ctx, log, func(_ string, seedClient ctrlruntimeclient.Client, log *zap.SugaredLogger) error {
seedSecret := &corev1.Secret{}
err := seedClient.Get(ctx, ctrlruntimeclient.ObjectKeyFromObject(secret), seedSecret)
if err != nil {
if apierrors.IsNotFound(err) {
log.Debug("Secret already deleted")
return nil
}
return err
}
return seedClient.Delete(ctx, seedSecret)
})
}