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client.go
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/
client.go
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// Copyright (c) 2019 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 client
import (
"context"
"errors"
"fmt"
"time"
"github.com/gardener/gardener/pkg/utils/flow"
utiltime "github.com/gardener/gardener/pkg/utils/time"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/runtime"
typedcorev1 "k8s.io/client-go/kubernetes/typed/core/v1"
"sigs.k8s.io/controller-runtime/pkg/client"
)
type objectsRemaining []runtime.Object
var unknownKey = client.ObjectKey{Namespace: "<unknown>", Name: "<unknown>"}
// Error implements error.
func (n *objectsRemaining) Error() string {
out := make([]string, 0, len(*n))
for _, obj := range *n {
key, err := client.ObjectKeyFromObject(obj)
if err != nil {
key = unknownKey
}
var typeID string
gvk := obj.GetObjectKind().GroupVersionKind()
if gvk.Empty() {
typeID = fmt.Sprintf("%T", (*n)[0])
} else {
typeID = gvk.String()
}
out = append(out, fmt.Sprintf("%s %s", typeID, key.String()))
}
return fmt.Sprintf("remaining objects are still present: %v", out)
}
// AreObjectsRemaining checks whether the given error is an 'objects remaining error'.
func AreObjectsRemaining(err error) bool {
_, ok := err.(*objectsRemaining)
return ok
}
// NewObjectsRemaining returns a new error with the remaining objects.
func NewObjectsRemaining(remaining runtime.Object) error {
if meta.IsListType(remaining) {
items, _ := meta.ExtractList(remaining)
err := objectsRemaining(items)
return &err
}
err := objectsRemaining{remaining}
return &err
}
// RemainingObjects retrieves the remaining objects of an `AreObjectsRemaining` error.
//
// If the error does not match `AreObjectsRemaining`, this returns nil.
func RemainingObjects(err error) []runtime.Object {
if nEmpty, ok := err.(*objectsRemaining); ok {
return *nEmpty
}
return nil
}
func delete(ctx context.Context, c client.Client, obj runtime.Object, opts ...client.DeleteOption) error {
return c.Delete(ctx, obj, opts...)
}
type finalizer struct{}
// NewFinalizer instantiates a default finalizer.
func NewFinalizer() Finalizer {
return &finalizer{}
}
var defaultFinalizer = NewFinalizer()
// Finalize removes the finalizers (.meta.finalizers) of given resource.
func (f *finalizer) Finalize(ctx context.Context, c client.Client, obj runtime.Object) error {
acc, err := meta.Accessor(obj)
if err != nil {
return err
}
withFinalizers := obj.DeepCopyObject()
acc.SetFinalizers(nil)
return c.Patch(ctx, obj, client.MergeFrom(withFinalizers))
}
// HasFinalizers checks whether the given resource has finalizers (.meta.finalizers).
func (f *finalizer) HasFinalizers(obj runtime.Object) (bool, error) {
acc, err := meta.Accessor(obj)
if err != nil {
return false, err
}
return len(acc.GetFinalizers()) > 0, nil
}
type crdFinalizer struct {
finalizer
}
// NewCRDFinalizer instantiates a CustomResourceDefinition finalizer.
func NewCRDFinalizer() Finalizer {
return &crdFinalizer{finalizer: finalizer{}}
}
// Finalize removes given CustomResourceDefinition from the Kubernetes store.
// For Kubernetes < v1.15 it is required to file a DELETE request after
// patching .meta.finalizers of the CustomResourceDefinition.
// Ref: https://github.com/kubernetes/kubernetes/issues/84354
func (f *crdFinalizer) Finalize(ctx context.Context, c client.Client, obj runtime.Object) error {
if err := f.finalizer.Finalize(ctx, c, obj); err != nil {
return err
}
return client.IgnoreNotFound(c.Delete(ctx, obj))
}
type namespaceFinalizer struct {
namespaceInterface typedcorev1.NamespaceInterface
}
// NewNamespaceFinalizer instantiates a namespace finalizer.
func NewNamespaceFinalizer(namespaceInterface typedcorev1.NamespaceInterface) Finalizer {
return &namespaceFinalizer{namespaceInterface}
}
// Finalize removes the finalizers of given namespace resource.
// Because of legacy reasons namespaces have both .meta.finalizers and .spec.finalizers.
// Both of them are removed. An error is returned when the given resource is not a namespace.
func (f *namespaceFinalizer) Finalize(ctx context.Context, c client.Client, obj runtime.Object) error {
namespace, ok := obj.(*corev1.Namespace)
if !ok {
return errors.New("corev1.Namespace is expected")
}
namespace.SetFinalizers(nil)
namespace.Spec.Finalizers = nil
// TODO (ialidzhikov): Use controller-runtime client once subresources are
// suported - https://github.com/kubernetes-sigs/controller-runtime/issues/172.
_, err := f.namespaceInterface.Finalize(namespace)
return err
}
// HasFinalizers checks whether the given namespace has finalizers
// (.meta.finalizers and .spec.finalizers).
func (f *namespaceFinalizer) HasFinalizers(obj runtime.Object) (bool, error) {
namespace, ok := obj.(*corev1.Namespace)
if !ok {
return false, errors.New("corev1.Namespace expected")
}
return len(namespace.Finalizers)+len(namespace.Spec.Finalizers) > 0, nil
}
type cleaner struct {
time utiltime.Ops
finalizer Finalizer
}
// NewCleaner instantiates a new Cleaner with the given utiltime.Ops and finalizer.
func NewCleaner(time utiltime.Ops, finalizer Finalizer) Cleaner {
return &cleaner{time, finalizer}
}
var defaultCleaner = NewCleaner(utiltime.DefaultOps(), defaultFinalizer)
// DefaultCleaner is the default Cleaner.
func DefaultCleaner() Cleaner {
return defaultCleaner
}
// NewCRDCleaner instantiates a new Cleaner with ability to clean CustomResourceDefinitions.
func NewCRDCleaner() Cleaner {
return NewCleaner(utiltime.DefaultOps(), NewCRDFinalizer())
}
// NewNamespaceCleaner instantiates a new Cleaner with ability to clean namespaces.
func NewNamespaceCleaner(namespaceInterface typedcorev1.NamespaceInterface) Cleaner {
return NewCleaner(utiltime.DefaultOps(), NewNamespaceFinalizer(namespaceInterface))
}
// Clean deletes and optionally finalizes resources that expired their termination date.
func (o *cleaner) Clean(ctx context.Context, c client.Client, obj runtime.Object, opts ...CleanOption) error {
cleanOptions := &CleanOptions{}
cleanOptions.ApplyOptions(opts)
if meta.IsListType(obj) {
return o.cleanCollection(ctx, c, obj, cleanOptions)
}
return o.clean(ctx, c, obj, cleanOptions)
}
func (o *cleaner) doClean(ctx context.Context, c client.Client, obj runtime.Object, cleanOptions *CleanOptions) error {
acc, err := meta.Accessor(obj)
if err != nil {
return err
}
gracePeriod := time.Second
if cleanOptions != nil && cleanOptions.FinalizeGracePeriodSeconds != nil {
gracePeriod *= time.Duration(*cleanOptions.FinalizeGracePeriodSeconds)
}
if !acc.GetDeletionTimestamp().IsZero() && acc.GetDeletionTimestamp().Time.Add(gracePeriod).Before(o.time.Now()) {
hasFinalizers, err := o.finalizer.HasFinalizers(obj)
if err != nil {
return err
}
if hasFinalizers {
return o.finalizer.Finalize(ctx, c, obj)
}
}
// Ref: https://github.com/kubernetes/kubernetes/issues/83771
if acc.GetDeletionTimestamp().IsZero() {
if err := delete(ctx, c, obj, cleanOptions.DeleteOptions...); err != nil {
for _, tolerate := range cleanOptions.ErrorToleration {
if tolerate(err) {
return nil
}
}
return err
}
}
return nil
}
var defaultGoneEnsurer = GoneEnsurerFunc(EnsureGone)
// EnsureGone implements GoneEnsurer.
func (f GoneEnsurerFunc) EnsureGone(ctx context.Context, c client.Client, obj runtime.Object, opts ...client.ListOption) error {
return f(ctx, c, obj, opts...)
}
// DefaultGoneEnsurer is the default GoneEnsurer.
func DefaultGoneEnsurer() GoneEnsurer {
return defaultGoneEnsurer
}
// GoneBeforeEnsurer returns an implementation of `GoneEnsurer` which is time aware.
func GoneBeforeEnsurer(before time.Time) GoneEnsurer {
return &beforeGoneEnsurer{
time: before,
}
}
type beforeGoneEnsurer struct {
time time.Time
}
// EnsureGoneBefore ensures that no given object or objects in the list exist before the given time.
func (b *beforeGoneEnsurer) EnsureGone(ctx context.Context, c client.Client, obj runtime.Object, opts ...client.ListOption) error {
if err := EnsureGone(ctx, c, obj, opts...); err != nil {
if _, ok := err.(*objectsRemaining); !ok {
return err
}
var (
relevants []runtime.Object
remainings = err.(*objectsRemaining)
)
for _, remaining := range *remainings {
accessor, err := meta.Accessor(remaining)
if err != nil {
return err
}
if accessor.GetCreationTimestamp().Time.Before(b.time) {
relevants = append(relevants, remaining)
}
}
if len(relevants) > 0 {
err := objectsRemaining(relevants)
return &err
}
}
return nil
}
// EnsureGone ensures that the given object or list is gone.
func EnsureGone(ctx context.Context, c client.Client, obj runtime.Object, opts ...client.ListOption) error {
if meta.IsListType(obj) {
return ensureCollectionGone(ctx, c, obj, opts...)
}
return ensureGone(ctx, c, obj)
}
func ensureGone(ctx context.Context, c client.Client, obj runtime.Object) error {
key, err := client.ObjectKeyFromObject(obj)
if err != nil {
return err
}
if err := c.Get(ctx, key, obj); err != nil {
if apierrors.IsNotFound(err) {
return nil
}
return err
}
return NewObjectsRemaining(obj)
}
func ensureCollectionGone(ctx context.Context, c client.Client, list runtime.Object, opts ...client.ListOption) error {
if err := c.List(ctx, list, opts...); err != nil {
return err
}
if meta.LenList(list) > 0 {
return NewObjectsRemaining(list)
}
return nil
}
func (o *cleaner) clean(ctx context.Context, c client.Client, obj runtime.Object, cleanOptions *CleanOptions) error {
key, err := client.ObjectKeyFromObject(obj)
if err != nil {
return err
}
if err := c.Get(ctx, key, obj); err != nil {
return err
}
return o.doClean(ctx, c, obj, cleanOptions)
}
func (o *cleaner) cleanCollection(
ctx context.Context,
c client.Client,
list runtime.Object,
cleanOptions *CleanOptions,
) error {
if err := c.List(ctx, list, cleanOptions.ListOptions...); err != nil {
return err
}
tasks := make([]flow.TaskFn, 0, meta.LenList(list))
if err := meta.EachListItem(list, func(obj runtime.Object) error {
tasks = append(tasks, func(ctx context.Context) error {
return client.IgnoreNotFound(o.doClean(ctx, c, obj, cleanOptions))
})
return nil
}); err != nil {
return err
}
return flow.Parallel(tasks...)(ctx)
}
type cleanerOps struct {
Cleaner
GoneEnsurer
}
// CleanAndEnsureGone cleans the target resources. Afterwards, it checks, whether the target resource is still
// present. If yes, it errors with a NewObjectsRemaining error.
func (o *cleanerOps) CleanAndEnsureGone(ctx context.Context, c client.Client, obj runtime.Object, opts ...CleanOption) error {
cleanOptions := &CleanOptions{}
cleanOptions.ApplyOptions(opts)
if err := o.Clean(ctx, c, obj, opts...); err != nil {
return err
}
return o.EnsureGone(ctx, c, obj, cleanOptions.ListOptions...)
}
// NewCleanOps instantiates new CleanOps with the given Cleaner and GoneEnsurer.
func NewCleanOps(cleaner Cleaner, ensurer GoneEnsurer) CleanOps {
return &cleanerOps{cleaner, ensurer}
}
var defaultCleanerOps = NewCleanOps(DefaultCleaner(), DefaultGoneEnsurer())
// DefaultCleanOps are the default CleanOps.
func DefaultCleanOps() CleanOps {
return defaultCleanerOps
}