/
strategy.go
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/
strategy.go
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// SPDX-License-Identifier: AGPL-3.0-only
// Provenance-includes-location: https://github.com/kubernetes/apiextensions-apiserver/blob/master/pkg/registry/customresource/strategy.go
// Provenance-includes-license: Apache-2.0
// Provenance-includes-copyright: The Kubernetes Authors.
package grafanaresource
import (
"context"
apiequality "k8s.io/apimachinery/pkg/api/equality"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/util/validation/field"
apiserverstorage "k8s.io/apiserver/pkg/storage"
"k8s.io/apiserver/pkg/storage/names"
"sigs.k8s.io/structured-merge-diff/v4/fieldpath"
)
// grafanaResourceStrategy implements behavior for GrafanaResources.
type grafanaResourceStrategy struct {
runtime.ObjectTyper
names.NameGenerator
namespaceScoped bool
status bool
scale bool
ref bool
history bool
kind schema.GroupVersionKind
}
func NewStrategy(typer runtime.ObjectTyper, namespaceScoped bool, kind schema.GroupVersionKind, status, scale, ref, history bool) grafanaResourceStrategy {
return grafanaResourceStrategy{
ObjectTyper: typer,
NameGenerator: names.SimpleNameGenerator,
namespaceScoped: namespaceScoped,
status: status,
scale: scale,
ref: ref,
history: history,
kind: kind,
}
}
func (a grafanaResourceStrategy) NamespaceScoped() bool {
return a.namespaceScoped
}
// GetResetFields returns the set of fields that get reset by the strategy
// and should not be modified by the user.
func (a grafanaResourceStrategy) GetResetFields() map[fieldpath.APIVersion]*fieldpath.Set {
fields := map[fieldpath.APIVersion]*fieldpath.Set{}
if a.status {
fields[fieldpath.APIVersion(a.kind.GroupVersion().String())] = fieldpath.NewSet(
fieldpath.MakePathOrDie("status"),
)
}
return fields
}
// PrepareForCreate clears the status of a GrafanaResource before creation.
func (a grafanaResourceStrategy) PrepareForCreate(ctx context.Context, obj runtime.Object) {
if a.status {
grafanaResourceObject := obj.(*unstructured.Unstructured)
grafanaResource := grafanaResourceObject.UnstructuredContent()
// create cannot set status
delete(grafanaResource, "status")
}
accessor, _ := meta.Accessor(obj)
accessor.SetGeneration(1)
}
// PrepareForUpdate clears fields that are not allowed to be set by end users on update.
func (a grafanaResourceStrategy) PrepareForUpdate(ctx context.Context, obj, old runtime.Object) {
newGrafanaResourceObject := obj.(*unstructured.Unstructured)
oldGrafanaResourceObject := old.(*unstructured.Unstructured)
newGrafanaResource := newGrafanaResourceObject.UnstructuredContent()
oldGrafanaResource := oldGrafanaResourceObject.UnstructuredContent()
// If the /status subresource endpoint is installed, update is not allowed to set status.
if a.status {
_, ok1 := newGrafanaResource["status"]
_, ok2 := oldGrafanaResource["status"]
switch {
case ok2:
newGrafanaResource["status"] = oldGrafanaResource["status"]
case ok1:
delete(newGrafanaResource, "status")
}
}
// except for the changes to `metadata`, any other changes
// cause the generation to increment.
newCopyContent := copyNonMetadata(newGrafanaResource)
oldCopyContent := copyNonMetadata(oldGrafanaResource)
if !apiequality.Semantic.DeepEqual(newCopyContent, oldCopyContent) {
oldAccessor, _ := meta.Accessor(oldGrafanaResourceObject)
newAccessor, _ := meta.Accessor(newGrafanaResourceObject)
newAccessor.SetGeneration(oldAccessor.GetGeneration() + 1)
}
}
func copyNonMetadata(original map[string]interface{}) map[string]interface{} {
ret := make(map[string]interface{})
for key, val := range original {
if key == "metadata" {
continue
}
ret[key] = val
}
return ret
}
// Validate validates a new GrafanaResource.
func (a grafanaResourceStrategy) Validate(ctx context.Context, obj runtime.Object) field.ErrorList {
return make(field.ErrorList, 0)
}
// WarningsOnCreate returns warnings for the creation of the given object.
func (grafanaResourceStrategy) WarningsOnCreate(ctx context.Context, obj runtime.Object) []string {
return nil
}
// Canonicalize normalizes the object after validation.
func (grafanaResourceStrategy) Canonicalize(obj runtime.Object) {
}
// AllowCreateOnUpdate is false for GrafanaResources; this means a POST is
// needed to create one.
func (grafanaResourceStrategy) AllowCreateOnUpdate() bool {
return false
}
// AllowUnconditionalUpdate is the default update policy for GrafanaResource objects.
func (grafanaResourceStrategy) AllowUnconditionalUpdate() bool {
return false
}
// ValidateUpdate is the default update validation for an end user updating status.
func (a grafanaResourceStrategy) ValidateUpdate(ctx context.Context, obj, old runtime.Object) field.ErrorList {
return make(field.ErrorList, 0)
}
// WarningsOnUpdate returns warnings for the given update.
func (grafanaResourceStrategy) WarningsOnUpdate(ctx context.Context, obj, old runtime.Object) []string {
return nil
}
// GetAttrs returns labels and fields of a given object for filtering purposes.
func (a grafanaResourceStrategy) GetAttrs(obj runtime.Object) (labels.Set, fields.Set, error) {
accessor, err := meta.Accessor(obj)
if err != nil {
return nil, nil, err
}
return labels.Set(accessor.GetLabels()), objectMetaFieldsSet(accessor, a.namespaceScoped), nil
}
// objectMetaFieldsSet returns a fields that represent the ObjectMeta.
func objectMetaFieldsSet(objectMeta metav1.Object, namespaceScoped bool) fields.Set {
if namespaceScoped {
return fields.Set{
"metadata.name": objectMeta.GetName(),
"metadata.namespace": objectMeta.GetNamespace(),
}
}
return fields.Set{
"metadata.name": objectMeta.GetName(),
}
}
// MatchGrafanaResourceDefinitionStorage is the filter used by the generic storage backend to route
// watch events from etcd to clients of the apiserver only interested in specific
// labels/fields.
func (a grafanaResourceStrategy) MatchGrafanaResourceDefinitionStorage(label labels.Selector, field fields.Selector) apiserverstorage.SelectionPredicate {
return apiserverstorage.SelectionPredicate{
Label: label,
Field: field,
GetAttrs: a.GetAttrs,
}
}