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resourceconfig.go
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/
resourceconfig.go
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// Copyright (c) 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 component
import (
"context"
"sigs.k8s.io/controller-runtime/pkg/client"
"github.com/gardener/gardener/pkg/controllerutils"
kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/gardener/gardener/pkg/utils/managedresources"
)
// Class is a type alias for describing the class of a resource.
type Class uint8
const (
// Runtime means that the resource belongs to the runtime cluster (seed).
Runtime Class = iota
// Application means that the resource belongs to the target cluster (shoot).
Application
)
// ResourceConfig contains the configuration for a resource. More concretely, it specifies the class and a mutation
// function MutateFn which should mutate the specification of the provided object Obj.
type ResourceConfig struct {
Obj client.Object
Class Class
MutateFn func()
}
// ResourceConfigs is a list of multiple ResourceConfig objects.
type ResourceConfigs []ResourceConfig
// AllRuntimeObjects returns all objects of class Runtime from the provided ResourceConfigs lists.
func AllRuntimeObjects(configsLists ...ResourceConfigs) []client.Object {
return allObjectsOfClass(Runtime, configsLists...)
}
// AllApplicationObjects returns all objects of class Application from the provided ResourceConfigs lists.
func AllApplicationObjects(configsLists ...ResourceConfigs) []client.Object {
return allObjectsOfClass(Application, configsLists...)
}
func allObjectsOfClass(class Class, configsLists ...ResourceConfigs) []client.Object {
var out []client.Object
for _, list := range configsLists {
for _, o := range list {
if o.Class == class {
out = append(out, o.Obj)
}
}
}
return out
}
// MergeResourceConfigs merges the provided ResourceConfigs lists into a new ResourceConfigs object.
func MergeResourceConfigs(configsLists ...ResourceConfigs) ResourceConfigs {
var length int
for _, list := range configsLists {
length += len(list)
}
out := make(ResourceConfigs, 0, length)
for _, list := range configsLists {
out = append(out, list...)
}
return out
}
// ClusterType is a type alias for a cluster type.
type ClusterType string
const (
// ClusterTypeSeed is a constant for the 'seed' cluster type.
ClusterTypeSeed ClusterType = "seed"
// ClusterTypeShoot is a constant for the 'shoot' cluster type.
ClusterTypeShoot ClusterType = "shoot"
)
// DeployResourceConfigs deploys the provided ResourceConfigs <allResources> based on the ClusterType.
// For seeds, all resources are deployed via a single ManagedResource (independent of their Class).
// For shoots, all Runtime resources are applied directly with the client while all Application resources are deployed
// via a ManagedResource.
func DeployResourceConfigs(
ctx context.Context,
c client.Client,
namespace string,
clusterType ClusterType,
managedResourceName string,
registry *managedresources.Registry,
allResources ResourceConfigs,
) error {
if clusterType == ClusterTypeSeed {
for _, r := range allResources {
if r.MutateFn != nil {
r.MutateFn()
}
if err := registry.Add(r.Obj); err != nil {
return err
}
}
return managedresources.CreateForSeed(ctx, c, namespace, managedResourceName, false, registry.SerializedObjects())
}
for _, r := range allResources {
switch r.Class {
case Application:
if r.MutateFn != nil {
r.MutateFn()
}
if err := registry.Add(r.Obj); err != nil {
return err
}
case Runtime:
if _, err := controllerutils.GetAndCreateOrMergePatch(ctx, c, r.Obj, func() error {
if r.MutateFn != nil {
r.MutateFn()
}
return nil
}); err != nil {
return err
}
}
}
return managedresources.CreateForShoot(ctx, c, namespace, managedResourceName, managedresources.LabelValueGardener, false, registry.SerializedObjects())
}
// DestroyResourceConfigs destroys the provided ResourceConfigs <allResources> based on the ClusterType.
// For seeds, all resources are deleted indirectly by deleting the ManagedResource.
// For shoots, all Runtime resources are deleted directly with the client while all Application resources are deleted
// indirectly by deleting the ManagedResource.
func DestroyResourceConfigs(
ctx context.Context,
c client.Client,
namespace string,
clusterType ClusterType,
managedResourceName string,
resourceConfigs ...ResourceConfigs,
) error {
if clusterType == ClusterTypeSeed {
return managedresources.DeleteForSeed(ctx, c, namespace, managedResourceName)
}
if err := managedresources.DeleteForShoot(ctx, c, namespace, managedResourceName); err != nil {
return err
}
return kubernetesutils.DeleteObjects(ctx, c, AllRuntimeObjects(resourceConfigs...)...)
}