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strategy.go
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strategy.go
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// Copyright 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 seed
import (
"context"
apiequality "k8s.io/apimachinery/pkg/api/equality"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/validation/field"
"k8s.io/apiserver/pkg/registry/rest"
"k8s.io/apiserver/pkg/storage/names"
"github.com/gardener/gardener/pkg/api"
"github.com/gardener/gardener/pkg/apis/core"
"github.com/gardener/gardener/pkg/apis/core/validation"
)
// Strategy defines the strategy for storing seeds.
type Strategy struct {
runtime.ObjectTyper
names.NameGenerator
CloudProfiles rest.StandardStorage
}
// NewStrategy defines the storage strategy for Seeds.
func NewStrategy(cloudProfiles rest.StandardStorage) Strategy {
return Strategy{api.Scheme, names.SimpleNameGenerator, cloudProfiles}
}
// NamespaceScoped returns true if the object must be within a namespace.
func (Strategy) NamespaceScoped() bool {
return false
}
// PrepareForCreate mutates some fields in the object before it's created.
func (s Strategy) PrepareForCreate(ctx context.Context, obj runtime.Object) {
seed := obj.(*core.Seed)
seed.Generation = 1
syncDependencyWatchdogSettings(seed)
seed.Status = core.SeedStatus{}
}
// PrepareForUpdate is invoked on update before validation to normalize
// the object. For example: remove fields that are not to be persisted,
// sort order-insensitive list fields, etc. This should not remove fields
// whose presence would be considered a validation error.
func (s Strategy) PrepareForUpdate(ctx context.Context, obj, old runtime.Object) {
newSeed := obj.(*core.Seed)
oldSeed := old.(*core.Seed)
syncDependencyWatchdogSettings(newSeed)
newSeed.Status = oldSeed.Status
if !apiequality.Semantic.DeepEqual(oldSeed.Spec, newSeed.Spec) {
newSeed.Generation = oldSeed.Generation + 1
}
}
func syncDependencyWatchdogSettings(seed *core.Seed) {
if seed.Spec.Settings == nil || seed.Spec.Settings.DependencyWatchdog == nil {
return
}
// keeping the field `weeder` and `endpoint` in sync
// TODO(himanshu-kun): Once the deprecated `Endpoint` / `Probe` fields are removed from the API, move the defaulting code back to `pkg/apis/core/*/defaults.go`.
// Case 1: If weeder is specified, endpoint isn't -> set endpoint=weeder
// Case 2: If weeder isn't specified, endpoint is -> make weeder=endpoint
// Case 3: If both are specified, give preference to weeder field -> set endpoint=weeder
// Case 4: If both not specified, default weeder.enabled to true
if seed.Spec.Settings.DependencyWatchdog.Weeder == nil {
seed.Spec.Settings.DependencyWatchdog.Weeder = &core.SeedSettingDependencyWatchdogWeeder{Enabled: true}
if seed.Spec.Settings.DependencyWatchdog.Endpoint != nil {
seed.Spec.Settings.DependencyWatchdog.Weeder = &core.SeedSettingDependencyWatchdogWeeder{Enabled: seed.Spec.Settings.DependencyWatchdog.Endpoint.Enabled}
}
}
seed.Spec.Settings.DependencyWatchdog.Endpoint = &core.SeedSettingDependencyWatchdogEndpoint{Enabled: seed.Spec.Settings.DependencyWatchdog.Weeder.Enabled}
//keeping the field `prober` and `probe` in sync
// Case 1: If prober is specified, probe isn't -> set probe=prober
// Case 2: If prober isn't specified, probe is -> make prober=probe
// Case 3: If both are specified, give preference to prober field -> set probe=prober
// Case 4: If both not specified, default prober.enabled to true
if seed.Spec.Settings.DependencyWatchdog.Prober == nil {
seed.Spec.Settings.DependencyWatchdog.Prober = &core.SeedSettingDependencyWatchdogProber{Enabled: true}
if seed.Spec.Settings.DependencyWatchdog.Probe != nil {
seed.Spec.Settings.DependencyWatchdog.Prober = &core.SeedSettingDependencyWatchdogProber{Enabled: seed.Spec.Settings.DependencyWatchdog.Probe.Enabled}
}
}
seed.Spec.Settings.DependencyWatchdog.Probe = &core.SeedSettingDependencyWatchdogProbe{Enabled: seed.Spec.Settings.DependencyWatchdog.Prober.Enabled}
}
// Validate validates the given object.
func (Strategy) Validate(ctx context.Context, obj runtime.Object) field.ErrorList {
seed := obj.(*core.Seed)
return validation.ValidateSeed(seed)
}
// Canonicalize allows an object to be mutated into a canonical form. This
// ensures that code that operates on these objects can rely on the common
// form for things like comparison. Canonicalize is invoked after
// validation has succeeded but before the object has been persisted.
// This method may mutate the object.
func (Strategy) Canonicalize(obj runtime.Object) {
}
// AllowCreateOnUpdate returns true if the object can be created by a PUT.
func (Strategy) AllowCreateOnUpdate() bool {
return false
}
// AllowUnconditionalUpdate returns true if the object can be updated
// unconditionally (irrespective of the latest resource version), when
// there is no resource version specified in the object.
func (Strategy) AllowUnconditionalUpdate() bool {
return true
}
// ValidateUpdate validates the update on the given old and new object.
func (Strategy) ValidateUpdate(ctx context.Context, newObj, oldObj runtime.Object) field.ErrorList {
oldSeed, newSeed := oldObj.(*core.Seed), newObj.(*core.Seed)
return validation.ValidateSeedUpdate(newSeed, oldSeed)
}
// WarningsOnCreate returns warnings to the client performing a create.
func (Strategy) WarningsOnCreate(ctx context.Context, obj runtime.Object) []string {
return nil
}
// WarningsOnUpdate returns warnings to the client performing the update.
func (Strategy) WarningsOnUpdate(ctx context.Context, obj, old runtime.Object) []string {
return nil
}
// StatusStrategy defines the strategy for storing seeds statuses.
type StatusStrategy struct {
Strategy
}
// NewStatusStrategy defines the storage strategy for the status subresource of Seeds.
func NewStatusStrategy(cloudProfiles rest.StandardStorage) StatusStrategy {
return StatusStrategy{NewStrategy(cloudProfiles)}
}
// PrepareForUpdate is invoked on update before validation to normalize
// the object. For example: remove fields that are not to be persisted,
// sort order-insensitive list fields, etc. This should not remove fields
// whose presence would be considered a validation error.
func (s StatusStrategy) PrepareForUpdate(ctx context.Context, obj, old runtime.Object) {
newSeed := obj.(*core.Seed)
oldSeed := old.(*core.Seed)
newSeed.Spec = oldSeed.Spec
syncDependencyWatchdogSettings(newSeed)
}
// ValidateUpdate validates the update on the given old and new object.
func (StatusStrategy) ValidateUpdate(ctx context.Context, obj, old runtime.Object) field.ErrorList {
return validation.ValidateSeedStatusUpdate(obj.(*core.Seed), old.(*core.Seed))
}