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utils.go
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utils.go
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package controller
import (
"context"
datautils "github.com/kyverno/kyverno/pkg/utils/data"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apimachinery/pkg/watch"
)
type CreateClient[T metav1.Object] interface {
Create(context.Context, T, metav1.CreateOptions) (T, error)
}
type GetClient[T metav1.Object] interface {
Get(context.Context, string, metav1.GetOptions) (T, error)
}
type UpdateClient[T metav1.Object] interface {
Update(context.Context, T, metav1.UpdateOptions) (T, error)
}
type DeleteClient interface {
Delete(context.Context, string, metav1.DeleteOptions) error
}
type PatchClient[T metav1.Object] interface {
Patch(context.Context, string, types.PatchType, []byte, metav1.PatchOptions, ...string) (T, error)
}
type ObjectClient[T metav1.Object] interface {
CreateClient[T]
GetClient[T]
UpdateClient[T]
DeleteClient
PatchClient[T]
}
type DeleteCollectionClient interface {
DeleteCollection(context.Context, metav1.DeleteOptions, metav1.ListOptions) error
}
type WatchClient interface {
Watch(context.Context, metav1.ListOptions) (watch.Interface, error)
}
type ListClient[T any] interface {
List(context.Context, metav1.ListOptions) (T, error)
}
type StatusClient[T metav1.Object] interface {
UpdateStatus(context.Context, T, metav1.UpdateOptions) (T, error)
}
type ObjectListClient[T metav1.Object, L any] interface {
ObjectClient[T]
ListClient[L]
}
type ObjectStatusClient[T metav1.Object] interface {
ObjectClient[T]
StatusClient[T]
}
type ObjectListStatusClient[T metav1.Object, L any] interface {
ObjectClient[T]
ListClient[L]
StatusClient[T]
}
type Object[T any] interface {
*T
metav1.Object
DeepCopy() *T
}
type Getter[T any] interface {
Get(string) (T, error)
}
type Setter[T any] interface {
Create(context.Context, T, metav1.CreateOptions) (T, error)
Update(context.Context, T, metav1.UpdateOptions) (T, error)
}
type Deleter interface {
Delete(context.Context, string, metav1.DeleteOptions) error
}
func GetOrNew[T any, R Object[T], G Getter[R]](name string, getter G) (R, error) {
obj, err := getter.Get(name)
if err != nil {
if apierrors.IsNotFound(err) {
obj = new(T)
obj.SetName(name)
} else {
return nil, err
}
}
return obj, nil
}
func CreateOrUpdate[T any, R Object[T], G Getter[R], S Setter[R]](ctx context.Context, name string, getter G, setter S, build func(R) error) (R, error) {
if obj, err := GetOrNew[T, R](name, getter); err != nil {
return nil, err
} else {
mutated := obj.DeepCopy()
if err := build(mutated); err != nil {
return nil, err
} else {
if obj.GetResourceVersion() == "" {
return setter.Create(ctx, mutated, metav1.CreateOptions{})
} else {
if datautils.DeepEqual(obj, mutated) {
return mutated, nil
} else {
return setter.Update(ctx, mutated, metav1.UpdateOptions{})
}
}
}
}
}
type DeepCopy[T any] interface {
DeepCopy() T
}
func Update[T interface {
metav1.Object
DeepCopy[T]
}, S UpdateClient[T]](ctx context.Context, obj T, setter S, build func(T) error,
) (T, error) {
mutated := obj.DeepCopy()
if err := build(mutated); err != nil {
var d T
return d, err
} else {
if datautils.DeepEqual(obj, mutated) {
return mutated, nil
} else {
return setter.Update(ctx, mutated, metav1.UpdateOptions{})
}
}
}
func UpdateStatus[T interface {
metav1.Object
DeepCopy[T]
}, S ObjectStatusClient[T]](ctx context.Context, obj T, setter S, build func(T) error,
) (T, error) {
var objNew T
objNew, err := setter.Get(ctx, obj.GetName(), metav1.GetOptions{})
if err != nil {
return objNew, err
}
mutated := objNew.DeepCopy()
if err := build(mutated); err != nil {
var d T
return d, err
} else {
if datautils.DeepEqual(obj, mutated) {
return mutated, nil
} else {
return setter.UpdateStatus(ctx, mutated, metav1.UpdateOptions{})
}
}
}
func Cleanup[T any, R Object[T]](ctx context.Context, actual []R, expected []R, deleter Deleter) error {
keep := sets.New[string]()
for _, obj := range expected {
keep.Insert(obj.GetName())
}
for _, obj := range actual {
if !keep.Has(obj.GetName()) {
if err := deleter.Delete(ctx, obj.GetName(), metav1.DeleteOptions{}); err != nil && !apierrors.IsNotFound(err) {
return err
}
}
}
return nil
}