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memory_resource_storage.go
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memory_resource_storage.go
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package memorystorage
import (
"bytes"
"context"
"fmt"
"reflect"
"sync"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/conversion"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/watch"
internal "github.com/clusterpedia-io/api/clusterpedia"
"github.com/clusterpedia-io/clusterpedia/pkg/storage"
cache "github.com/clusterpedia-io/clusterpedia/pkg/storage/memorystorage/watchcache"
utilwatch "github.com/clusterpedia-io/clusterpedia/pkg/utils/watch"
)
var (
storages *resourceStorages
)
type resourceStorages struct {
sync.RWMutex
resourceStorages map[schema.GroupVersionResource]*ResourceStorage
}
func init() {
storages = &resourceStorages{
resourceStorages: make(map[schema.GroupVersionResource]*ResourceStorage),
}
}
type ClusterWatchEvent struct {
Event watch.Event
ClusterName string
}
type ResourceStorage struct {
sync.RWMutex
Codec runtime.Codec
watchCache *cache.WatchCache
CrvSynchro *cache.ClusterResourceVersionSynchro
incoming chan ClusterWatchEvent
storageConfig *storage.ResourceStorageConfig
}
func (s *ResourceStorage) GetStorageConfig() *storage.ResourceStorageConfig {
return s.storageConfig
}
func (s *ResourceStorage) Create(ctx context.Context, cluster string, obj runtime.Object) error {
resourceVersion, err := s.CrvSynchro.UpdateClusterResourceVersion(obj, cluster)
if err != nil {
return err
}
err = s.watchCache.Add(obj, cluster, resourceVersion, s.storageConfig.Codec, s.storageConfig.MemoryVersion)
if err != nil {
utilruntime.HandleError(fmt.Errorf("unable to add watch event object (%#v) to store: %v", obj, err))
}
return nil
}
func (s *ResourceStorage) Update(ctx context.Context, cluster string, obj runtime.Object) error {
resourceVersion, err := s.CrvSynchro.UpdateClusterResourceVersion(obj, cluster)
if err != nil {
return err
}
err = s.watchCache.Update(obj, cluster, resourceVersion, s.storageConfig.Codec, s.storageConfig.MemoryVersion)
if err != nil {
utilruntime.HandleError(fmt.Errorf("unable to add watch event object (%#v) to store: %v", obj, err))
}
return nil
}
func (s *ResourceStorage) Delete(ctx context.Context, cluster string, obj runtime.Object) error {
resourceVersion, err := s.CrvSynchro.UpdateClusterResourceVersion(obj, cluster)
if err != nil {
return err
}
err = s.watchCache.Delete(obj, cluster, resourceVersion, s.storageConfig.Codec, s.storageConfig.MemoryVersion)
if err != nil {
utilruntime.HandleError(fmt.Errorf("unable to add watch event object (%#v) to store: %v", obj, err))
}
return nil
}
func (s *ResourceStorage) Get(ctx context.Context, cluster, namespace, name string, into runtime.Object) error {
var buffer bytes.Buffer
se, err := s.watchCache.WaitUntilFreshAndGet(cluster, namespace, name)
if err != nil {
return err
}
object := se.Object
err = s.Codec.Encode(object, &buffer)
if err != nil {
return err
}
obj, _, err := s.Codec.Decode(buffer.Bytes(), nil, into)
if err != nil {
return err
}
if obj != into {
return fmt.Errorf("Failed to decode resource, into is %T", into)
}
return nil
}
// nolint
func (s *ResourceStorage) newClusterWatchEvent(eventType watch.EventType, obj runtime.Object, cluster string) *ClusterWatchEvent {
return &ClusterWatchEvent{
ClusterName: cluster,
Event: watch.Event{
Type: eventType,
Object: obj,
},
}
}
func (s *ResourceStorage) List(ctx context.Context, listObject runtime.Object, opts *internal.ListOptions) error {
var buffer bytes.Buffer
objects, readResourceVersion, err := s.watchCache.WaitUntilFreshAndList(opts)
if err != nil {
return err
}
list, err := meta.ListAccessor(listObject)
if err != nil {
return err
}
if len(objects) == 0 {
return nil
}
listPtr, err := meta.GetItemsPtr(listObject)
if err != nil {
return err
}
v, err := conversion.EnforcePtr(listPtr)
if err != nil || v.Kind() != reflect.Slice {
return fmt.Errorf("need ptr to slice: %v", err)
}
expected := reflect.New(v.Type().Elem()).Interface().(runtime.Object)
seen := map[string]struct{}{}
accessor := meta.NewAccessor()
deduplicated := make([]runtime.Object, 0, len(objects))
for _, object := range objects {
buffer.Reset()
obj := object.Object
err = s.Codec.Encode(obj, &buffer)
if err != nil {
return err
}
obj, _, err := s.Codec.Decode(buffer.Bytes(), nil, expected.DeepCopyObject())
if err != nil {
return err
}
name, err := accessor.Name(obj)
if err != nil {
return err
}
if _, ok := seen[name]; !ok {
seen[name] = struct{}{}
deduplicated = append(deduplicated, obj)
}
}
slice := reflect.MakeSlice(v.Type(), len(deduplicated), len(deduplicated))
for i, obj := range deduplicated {
slice.Index(i).Set(reflect.ValueOf(obj).Elem())
}
list.SetResourceVersion(readResourceVersion.GetClusterResourceVersion())
v.Set(slice)
return nil
}
func (s *ResourceStorage) Watch(ctx context.Context, options *internal.ListOptions) (watch.Interface, error) {
resourceversion := options.ResourceVersion
watchRV, err := cache.NewClusterResourceVersionFromString(resourceversion)
if err != nil {
// To match the uncached watch implementation, once we have passed authn/authz/admission,
// and successfully parsed a resource version, other errors must fail with a watch event of type ERROR,
// rather than a directly returned error.
return newErrWatcher(err), nil
}
watcher := cache.NewCacheWatcher(100)
watchCache := s.watchCache
watchCache.Lock()
defer watchCache.Unlock()
initEvents, err := watchCache.GetAllEventsSinceThreadUnsafe(watchRV)
if err != nil {
// To match the uncached watch implementation, once we have passed authn/authz/admission,
// and successfully parsed a resource version, other errors must fail with a watch event of type ERROR,
// rather than a directly returned error.
return newErrWatcher(err), nil
}
func() {
watchCache.WatchersLock.Lock()
defer watchCache.WatchersLock.Unlock()
watchCache.WatchersBuffer = append(watchCache.WatchersBuffer, watcher)
}()
go watcher.Process(ctx, initEvents)
return watcher, nil
}
type errWatcher struct {
result chan watch.Event
}
func newErrWatcher(err error) *errWatcher {
errEvent := utilwatch.NewErrorEvent(err)
// Create a watcher with room for a single event, populate it, and close the channel
watcher := &errWatcher{result: make(chan watch.Event, 1)}
watcher.result <- errEvent
close(watcher.result)
return watcher
}
func (c *errWatcher) ResultChan() <-chan watch.Event {
return c.result
}
func (c *errWatcher) Stop() {
// no-op
}