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reconciler.go
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reconciler.go
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// Copyright 2022 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// 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 heartbeat
import (
"context"
"time"
coordinationv1 "k8s.io/api/coordination/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/utils/clock"
"sigs.k8s.io/controller-runtime/pkg/client"
logf "sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"github.com/gardener/gardener/pkg/extensions"
)
type reconciler struct {
client client.Client
extensionName string
renewIntervalSeconds int32
namespace string
clock clock.Clock
}
// NewReconciler creates a new reconciler that will renew the heartbeat lease resource.
func NewReconciler(mgr manager.Manager, extensionName string, namespace string, renewIntervalSeconds int32, clock clock.Clock) reconcile.Reconciler {
return &reconciler{
client: mgr.GetClient(),
extensionName: extensionName,
renewIntervalSeconds: renewIntervalSeconds,
namespace: namespace,
clock: clock,
}
}
// Reconcile renews the heartbeat lease resource.
func (r *reconciler) Reconcile(ctx context.Context, _ reconcile.Request) (reconcile.Result, error) {
log := logf.FromContext(ctx)
lease := &coordinationv1.Lease{
ObjectMeta: metav1.ObjectMeta{
Name: extensions.HeartBeatResourceName,
Namespace: r.namespace,
},
}
if err := r.client.Get(ctx, client.ObjectKeyFromObject(lease), lease); err != nil {
if apierrors.IsNotFound(err) {
lease.Spec = coordinationv1.LeaseSpec{
HolderIdentity: &r.extensionName,
LeaseDurationSeconds: &r.renewIntervalSeconds,
RenewTime: &metav1.MicroTime{Time: r.clock.Now().UTC()},
}
log.V(1).Info("Creating heartbeat Lease", "lease", client.ObjectKeyFromObject(lease))
return reconcile.Result{RequeueAfter: time.Duration(r.renewIntervalSeconds) * time.Second}, r.client.Create(ctx, lease)
}
return reconcile.Result{}, err
}
lease.Spec = coordinationv1.LeaseSpec{
HolderIdentity: &r.extensionName,
LeaseDurationSeconds: &r.renewIntervalSeconds,
RenewTime: &metav1.MicroTime{Time: r.clock.Now().UTC()},
}
log.V(1).Info("Renewing heartbeat Lease", "lease", client.ObjectKeyFromObject(lease))
return reconcile.Result{RequeueAfter: time.Duration(r.renewIntervalSeconds) * time.Second}, r.client.Update(ctx, lease)
}