/
reconciler.go
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/
reconciler.go
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/*
Copyright 2020 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 seedsync
import (
"context"
"fmt"
"time"
"go.uber.org/zap"
kubermaticv1 "github.com/kubermatic/kubermatic/api/pkg/crd/kubermatic/v1"
"github.com/kubermatic/kubermatic/api/pkg/kubernetes"
"github.com/kubermatic/kubermatic/api/pkg/provider"
"github.com/kubermatic/kubermatic/api/pkg/resources/reconciling"
corev1 "k8s.io/api/core/v1"
kerrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/client-go/tools/record"
ctrlruntimeclient "sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
)
// Reconciler copies seed CRs into their respective clusters,
// assuming that Kubermatic and the seed CRD have already been
// installed.
type Reconciler struct {
ctrlruntimeclient.Client
seedClientGetter provider.SeedClientGetter
log *zap.SugaredLogger
ctx context.Context
recorder record.EventRecorder
}
func (r *Reconciler) Reconcile(request reconcile.Request) (reconcile.Result, error) {
logger := r.log.With("seed", request.Name)
logger.Info("Reconciling seed")
seed := &kubermaticv1.Seed{}
if err := r.Get(r.ctx, request.NamespacedName, seed); err != nil {
if kerrors.IsNotFound(err) {
return reconcile.Result{}, nil
}
return reconcile.Result{}, fmt.Errorf("failed to get seed: %v", err)
}
client, err := r.seedClientGetter(seed)
if err != nil {
return reconcile.Result{}, fmt.Errorf("failed to create client for seed: %v", err)
}
// cleanup once a Seed was deleted in the master cluster
if seed.DeletionTimestamp != nil {
result, err := r.cleanupDeletedSeed(seed, client, logger)
if err != nil {
return reconcile.Result{}, fmt.Errorf("failed to cleanup deleted Seed: %v", err)
}
if result != nil {
return *result, nil
}
return reconcile.Result{}, nil
}
if err := r.reconcile(seed, client, logger); err != nil {
r.recorder.Eventf(seed, corev1.EventTypeWarning, "ReconcilingFailed", "%v", err)
return reconcile.Result{}, fmt.Errorf("failed to reconcile: %v", err)
}
logger.Info("Successfully reconciled")
return reconcile.Result{}, nil
}
func (r *Reconciler) reconcile(seed *kubermaticv1.Seed, client ctrlruntimeclient.Client, logger *zap.SugaredLogger) error {
// ensure we always have a cleanup finalizer on the original
// Seed CR inside the master cluster
oldSeed := seed.DeepCopy()
kubernetes.AddFinalizer(seed, CleanupFinalizer)
if err := r.Patch(r.ctx, seed, ctrlruntimeclient.MergeFrom(oldSeed)); err != nil {
return fmt.Errorf("failed to add finalizer to Seed: %v", err)
}
seedCreators := []reconciling.NamedSeedCreatorGetter{
seedCreator(seed),
}
supportedStrategies := map[corev1.ServiceType]struct{}{
corev1.ServiceTypeNodePort: {},
corev1.ServiceTypeLoadBalancer: {},
}
if seed.Spec.ExposeStrategy != "" {
if _, ok := supportedStrategies[seed.Spec.ExposeStrategy]; !ok {
return fmt.Errorf("failed to validate seed: invalid Seed Expose Strategy %s", seed.Spec.ExposeStrategy)
}
}
if err := reconciling.ReconcileSeeds(r.ctx, seedCreators, seed.Namespace, client); err != nil {
return fmt.Errorf("failed to reconcile seed: %v", err)
}
return nil
}
// cleanupDeletedSeed is triggered when a Seed CR inside the master cluster has been deleted
// and is responsible for removing the Seed CR copy inside the seed cluster. This can end up
// in a Retry if other components like the Kubermatic Operator still have finalizers on the
// Seed CR copy.
func (r *Reconciler) cleanupDeletedSeed(seedInMaster *kubermaticv1.Seed, seedClient ctrlruntimeclient.Client, logger *zap.SugaredLogger) (*reconcile.Result, error) {
if !kubernetes.HasAnyFinalizer(seedInMaster, CleanupFinalizer) {
return nil, nil
}
logger.Debug("Seed was deleted, removing copy in seed cluster")
key, err := ctrlruntimeclient.ObjectKeyFromObject(seedInMaster)
if err != nil {
return nil, fmt.Errorf("failed to create object key for Seed CR: %v", err)
}
// when master==seed cluster, this is the same as seedInMaster
seedInSeed := &kubermaticv1.Seed{}
err = seedClient.Get(r.ctx, key, seedInSeed)
if err != nil && !kerrors.IsNotFound(err) {
return nil, fmt.Errorf("failed to probe for %s: %v", key, err)
}
// if the copy still exists, attempt to delete it unless it has only our own finalizer
// (we have a master==seed situation) and deleting it again would be futile.
if err == nil && !kubernetes.HasOnlyFinalizer(seedInSeed, CleanupFinalizer) {
logger.Debug("Issuing DELETE call for Seed copy now")
if err := seedClient.Delete(r.ctx, seedInSeed); err != nil {
return nil, fmt.Errorf("failed to delete %s: %v", key, err)
}
return &reconcile.Result{
// cleanup in remote seed clusters can be slow over long distances
RequeueAfter: 3 * time.Second,
}, nil
}
// at this point either the Seed CR copy is gone or it has only our own finalizer left
oldSeed := seedInMaster.DeepCopy()
kubernetes.RemoveFinalizer(seedInMaster, CleanupFinalizer)
if err := r.Patch(r.ctx, seedInMaster, ctrlruntimeclient.MergeFrom(oldSeed)); err != nil {
return nil, fmt.Errorf("failed to remove finalizer from Seed in master cluster: %v", err)
}
return nil, nil
}