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strategy.go
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strategy.go
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// Copyright 2021 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 bastion
import (
"context"
"fmt"
"time"
apiequality "k8s.io/apimachinery/pkg/api/equality"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/validation/field"
"k8s.io/apiserver/pkg/registry/generic"
"k8s.io/apiserver/pkg/storage"
"k8s.io/apiserver/pkg/storage/names"
"github.com/gardener/gardener/pkg/api"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/apis/operations"
operationsvalidation "github.com/gardener/gardener/pkg/apis/operations/validation"
kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes"
)
const (
// TimeToLive is the duration the ExpirationTimestamp of a bastion will be extended
// by on every heartbeat.
TimeToLive = 1 * time.Hour
)
type bastionStrategy struct {
runtime.ObjectTyper
names.NameGenerator
timeToLive time.Duration
}
// Strategy defines the storage strategy for Bastions.
var Strategy = bastionStrategy{api.Scheme, names.SimpleNameGenerator, TimeToLive}
func (bastionStrategy) NamespaceScoped() bool {
return true
}
func (s bastionStrategy) PrepareForCreate(ctx context.Context, obj runtime.Object) {
bastion := obj.(*operations.Bastion)
bastion.Generation = 1
s.heartbeat(bastion)
}
func (s bastionStrategy) heartbeat(bastion *operations.Bastion) {
now := metav1.NewTime(time.Now())
expires := metav1.NewTime(now.Add(s.timeToLive))
bastion.Status.LastHeartbeatTimestamp = &now
bastion.Status.ExpirationTimestamp = &expires
if bastion.Annotations[v1beta1constants.GardenerOperation] == v1beta1constants.GardenerOperationKeepalive {
delete(bastion.Annotations, v1beta1constants.GardenerOperation)
}
}
func (s bastionStrategy) PrepareForUpdate(ctx context.Context, obj, old runtime.Object) {
newBastion := obj.(*operations.Bastion)
oldBastion := old.(*operations.Bastion)
newBastion.Status = oldBastion.Status
if mustIncreaseGeneration(oldBastion, newBastion) {
newBastion.Generation = oldBastion.Generation + 1
}
if newBastion.Annotations[v1beta1constants.GardenerOperation] == v1beta1constants.GardenerOperationKeepalive {
s.heartbeat(newBastion)
}
}
func mustIncreaseGeneration(oldBastion, newBastion *operations.Bastion) bool {
// The Bastion specification changes.
if !apiequality.Semantic.DeepEqual(oldBastion.Spec, newBastion.Spec) {
return true
}
// The deletion timestamp was set.
if oldBastion.DeletionTimestamp == nil && newBastion.DeletionTimestamp != nil {
return true
}
if kubernetesutils.HasMetaDataAnnotation(&newBastion.ObjectMeta, v1beta1constants.GardenerOperation, v1beta1constants.GardenerOperationReconcile) {
return true
}
return false
}
func (bastionStrategy) Validate(ctx context.Context, obj runtime.Object) field.ErrorList {
bastion := obj.(*operations.Bastion)
return operationsvalidation.ValidateBastion(bastion)
}
func (bastionStrategy) Canonicalize(obj runtime.Object) {
}
func (bastionStrategy) AllowCreateOnUpdate() bool {
return false
}
func (bastionStrategy) ValidateUpdate(ctx context.Context, newObj, oldObj runtime.Object) field.ErrorList {
oldBastion, newBastion := oldObj.(*operations.Bastion), newObj.(*operations.Bastion)
return operationsvalidation.ValidateBastionUpdate(newBastion, oldBastion)
}
func (bastionStrategy) AllowUnconditionalUpdate() bool {
return false
}
// WarningsOnCreate returns warnings to the client performing a create.
func (bastionStrategy) WarningsOnCreate(ctx context.Context, obj runtime.Object) []string {
return nil
}
// WarningsOnUpdate returns warnings to the client performing the update.
func (bastionStrategy) WarningsOnUpdate(ctx context.Context, obj, old runtime.Object) []string {
return nil
}
type bastionStatusStrategy struct {
bastionStrategy
}
// StatusStrategy defines the storage strategy for the status subresource of Bastions.
var StatusStrategy = bastionStatusStrategy{Strategy}
func (s bastionStatusStrategy) PrepareForUpdate(ctx context.Context, obj, old runtime.Object) {
newBastion := obj.(*operations.Bastion)
oldBastion := old.(*operations.Bastion)
newBastion.Spec = oldBastion.Spec
// recalculate to prevent manipulation
expires := metav1.NewTime(newBastion.Status.LastHeartbeatTimestamp.Add(s.timeToLive))
newBastion.Status.ExpirationTimestamp = &expires
}
func (bastionStatusStrategy) ValidateUpdate(ctx context.Context, obj, old runtime.Object) field.ErrorList {
return operationsvalidation.ValidateBastionStatusUpdate(obj.(*operations.Bastion), old.(*operations.Bastion))
}
// ToSelectableFields returns a field set that represents the object
// TODO: fields are not labels, and the validation rules for them do not apply.
func ToSelectableFields(bastion *operations.Bastion) fields.Set {
// The purpose of allocation with a given number of elements is to reduce
// amount of allocations needed to create the fields.Set. If you add any
// field here or the number of object-meta related fields changes, this should
// be adjusted.
bastionSpecificFieldsSet := make(fields.Set, 4)
bastionSpecificFieldsSet[operations.BastionSeedName] = getSeedName(bastion)
bastionSpecificFieldsSet[operations.BastionShootName] = bastion.Spec.ShootRef.Name
return generic.AddObjectMetaFieldsSet(bastionSpecificFieldsSet, &bastion.ObjectMeta, true)
}
// GetAttrs returns labels and fields of a given object for filtering purposes.
func GetAttrs(obj runtime.Object) (labels.Set, fields.Set, error) {
bastion, ok := obj.(*operations.Bastion)
if !ok {
return nil, nil, fmt.Errorf("not a bastion")
}
return labels.Set(bastion.ObjectMeta.Labels), ToSelectableFields(bastion), nil
}
// MatchBastion returns a generic matcher for a given label and field selector.
func MatchBastion(label labels.Selector, field fields.Selector) storage.SelectionPredicate {
return storage.SelectionPredicate{
Label: label,
Field: field,
GetAttrs: GetAttrs,
IndexFields: []string{operations.BastionSeedName},
}
}
// SeedNameTriggerFunc returns spec.seedName of given Bastion.
func SeedNameTriggerFunc(obj runtime.Object) string {
bastion, ok := obj.(*operations.Bastion)
if !ok {
return ""
}
return getSeedName(bastion)
}
func getSeedName(bastion *operations.Bastion) string {
if bastion.Spec.SeedName == nil {
return ""
}
return *bastion.Spec.SeedName
}