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service_base.go
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service_base.go
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package resource
import (
"context"
"fmt"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/tools/cache"
)
var NotFound = fmt.Errorf("resource not found")
type Appendable interface {
Append() interface{}
}
type Unsubscribe func()
type ServiceBase interface {
ListByIndex(index, key string, result Appendable) error
GetByKey(key string, result interface{}) error
AddIndexers(indexers cache.Indexers) error
Create(obj interface{}, result interface{}) error
Apply(obj interface{}, result interface{}) error
GVR() schema.GroupVersionResource
DeleteInNamespace(name, namespace string) error
Delete(name string) error
Subscribe(handler EventHandlerProvider) (Unsubscribe, error)
}
type enabledServiceBase struct {
Client dynamic.NamespaceableResourceInterface
Informer cache.SharedIndexInformer
notifier *Notifier
gvr schema.GroupVersionResource
}
func (s *enabledServiceBase) ListByIndex(index, key string, result Appendable) error {
items, err := s.Informer.GetIndexer().ByIndex(index, key)
if err != nil {
return err
}
for _, item := range items {
converted := result.Append()
err := FromUnstructured(item.(*unstructured.Unstructured), converted)
if err != nil {
return err
}
}
return nil
}
func (s *enabledServiceBase) GetByKey(key string, result interface{}) error {
item, exists, err := s.Informer.GetStore().GetByKey(key)
if err != nil {
return err
}
if !exists {
return NotFound
}
err = FromUnstructured(item.(*unstructured.Unstructured), result)
if err != nil {
return err
}
return nil
}
func (s *enabledServiceBase) AddIndexers(indexers cache.Indexers) error {
err := s.Informer.AddIndexers(indexers)
if err != nil && err.Error() == "informer has already started" {
return nil
}
return err
}
func (s *enabledServiceBase) Create(obj interface{}, result interface{}) error {
u, err := ToUnstructured(obj)
if err != nil {
return err
}
var created *unstructured.Unstructured
if u.GetNamespace() == "" {
created, err = s.Client.Create(context.Background(), u, v1.CreateOptions{})
} else {
created, err = s.Client.Namespace(u.GetNamespace()).Create(context.Background(), u, v1.CreateOptions{})
}
if err != nil {
return err
}
return FromUnstructured(created, result)
}
func (s *enabledServiceBase) Apply(obj interface{}, result interface{}) error {
u, err := ToUnstructured(obj)
if err != nil {
return err
}
var updated *unstructured.Unstructured
if u.GetNamespace() == "" {
updated, err = s.Client.Update(context.Background(), u, v1.UpdateOptions{})
} else {
updated, err = s.Client.Namespace(u.GetNamespace()).Update(context.Background(), u, v1.UpdateOptions{})
}
if err != nil {
return err
}
return FromUnstructured(updated, result)
}
func (s *enabledServiceBase) Subscribe(handler EventHandlerProvider) (Unsubscribe, error) {
listener := NewListener(handler)
s.notifier.AddListener(listener)
return func() {
s.deleteListener(listener)
}, nil
}
func (s *enabledServiceBase) deleteListener(listener *Listener) {
s.notifier.DeleteListener(listener)
}
func (s *enabledServiceBase) DeleteInNamespace(name, namespace string) error {
return s.Client.Namespace(namespace).Delete(context.Background(), name, v1.DeleteOptions{})
}
func (s *enabledServiceBase) Delete(name string) error {
return s.Client.Delete(context.Background(), name, v1.DeleteOptions{})
}
func (s *enabledServiceBase) GVR() schema.GroupVersionResource {
return s.gvr
}
type disabledServiceBase struct {
gvr schema.GroupVersionResource
err error
}
func (s disabledServiceBase) ListByIndex(_, _ string, _ Appendable) error {
return s.err
}
func (s disabledServiceBase) GetByKey(_ string, _ interface{}) error {
return s.err
}
func (s disabledServiceBase) AddIndexers(_ cache.Indexers) error {
return s.err
}
func (s disabledServiceBase) Create(_ interface{}, _ interface{}) error {
return s.err
}
func (s disabledServiceBase) Apply(_ interface{}, _ interface{}) error {
return s.err
}
func (s disabledServiceBase) GVR() schema.GroupVersionResource {
return s.gvr
}
func (s disabledServiceBase) DeleteInNamespace(_, _ string) error {
return s.err
}
func (s disabledServiceBase) Delete(_ string) error {
return s.err
}
func (s disabledServiceBase) Subscribe(_ EventHandlerProvider) (Unsubscribe, error) {
return func() {}, s.err
}