/
controllerregistration.go
92 lines (81 loc) · 4.55 KB
/
controllerregistration.go
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// Copyright (c) 2018 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 kubernetes
import (
"context"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
gardencore "github.com/gardener/gardener/pkg/client/core/clientset/versioned"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/logger"
"k8s.io/apimachinery/pkg/api/equality"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/util/retry"
)
func tryUpdateControllerRegistration(
ctx context.Context,
g gardencore.Interface,
backoff wait.Backoff,
meta metav1.ObjectMeta,
transform func(*gardencorev1beta1.ControllerRegistration) (*gardencorev1beta1.ControllerRegistration, error),
updateFunc func(g gardencore.Interface, controllerRegistration *gardencorev1beta1.ControllerRegistration) (*gardencorev1beta1.ControllerRegistration, error),
equalFunc func(cur, updated *gardencorev1beta1.ControllerRegistration) bool,
) (*gardencorev1beta1.ControllerRegistration, error) {
var (
result *gardencorev1beta1.ControllerRegistration
attempt int
)
err := retry.RetryOnConflict(backoff, func() (err error) {
attempt++
cur, err := g.CoreV1beta1().ControllerRegistrations().Get(ctx, meta.Name, kubernetes.DefaultGetOptions())
if err != nil {
return err
}
updated, err := transform(cur.DeepCopy())
if err != nil {
return err
}
if equalFunc(cur, updated) {
result = cur
return nil
}
result, err = updateFunc(g, updated)
if err != nil {
logger.Logger.Errorf("Attempt %d failed to update ControllerRegistration %s due to %v", attempt, cur.Name, err)
}
return
})
if err != nil {
logger.Logger.Errorf("Failed to update ControllerRegistration %s after %d attempts due to %v", meta.Name, attempt, err)
}
return result, err
}
// TryUpdateControllerRegistrationWithEqualFunc tries to update the status of the controllerRegistration matching the given <meta>.
// It retries with the given <backoff> characteristics as long as it gets Conflict errors.
// The transformation function is applied to the current state of the ControllerRegistration object. If the equal
// func concludes a semantically equal ControllerRegistration, no update is done and the operation returns normally.
func TryUpdateControllerRegistrationWithEqualFunc(ctx context.Context, g gardencore.Interface, backoff wait.Backoff, meta metav1.ObjectMeta, transform func(*gardencorev1beta1.ControllerRegistration) (*gardencorev1beta1.ControllerRegistration, error), equal func(cur, updated *gardencorev1beta1.ControllerRegistration) bool) (*gardencorev1beta1.ControllerRegistration, error) {
return tryUpdateControllerRegistration(ctx, g, backoff, meta, transform, func(g gardencore.Interface, controllerRegistration *gardencorev1beta1.ControllerRegistration) (*gardencorev1beta1.ControllerRegistration, error) {
return g.CoreV1beta1().ControllerRegistrations().Update(ctx, controllerRegistration, kubernetes.DefaultUpdateOptions())
}, equal)
}
// TryUpdateControllerRegistration tries to update the status of the controllerRegistration matching the given <meta>.
// It retries with the given <backoff> characteristics as long as it gets Conflict errors.
// The transformation function is applied to the current state of the ControllerRegistration object. If the transformation
// yields a semantically equal ControllerRegistration, no update is done and the operation returns normally.
func TryUpdateControllerRegistration(ctx context.Context, g gardencore.Interface, backoff wait.Backoff, meta metav1.ObjectMeta, transform func(*gardencorev1beta1.ControllerRegistration) (*gardencorev1beta1.ControllerRegistration, error)) (*gardencorev1beta1.ControllerRegistration, error) {
return TryUpdateControllerRegistrationWithEqualFunc(ctx, g, backoff, meta, transform, func(cur, updated *gardencorev1beta1.ControllerRegistration) bool {
return equality.Semantic.DeepEqual(cur, updated)
})
}