| /* |
| Copyright 2015 The Kubernetes Authors. |
| |
| 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 registry |
| |
| import ( |
| "sync" |
| |
| "k8s.io/klog" |
| |
| "k8s.io/apimachinery/pkg/runtime" |
| "k8s.io/apiserver/pkg/registry/generic" |
| "k8s.io/apiserver/pkg/storage" |
| cacherstorage "k8s.io/apiserver/pkg/storage/cacher" |
| etcdstorage "k8s.io/apiserver/pkg/storage/etcd" |
| "k8s.io/apiserver/pkg/storage/storagebackend" |
| "k8s.io/apiserver/pkg/storage/storagebackend/factory" |
| ) |
| |
| // Creates a cacher based given storageConfig. |
| func StorageWithCacher(capacity int) generic.StorageDecorator { |
| return func( |
| storageConfig *storagebackend.Config, |
| resourcePrefix string, |
| keyFunc func(obj runtime.Object) (string, error), |
| newFunc func() runtime.Object, |
| newListFunc func() runtime.Object, |
| getAttrsFunc storage.AttrFunc, |
| triggerFunc storage.TriggerPublisherFunc) (storage.Interface, factory.DestroyFunc) { |
| |
| s, d := generic.NewRawStorage(storageConfig) |
| if capacity <= 0 { |
| klog.V(5).Infof("Storage caching is disabled for %T", newFunc()) |
| return s, d |
| } |
| if klog.V(5) { |
| klog.Infof("Storage caching is enabled for %T with capacity %v", newFunc(), capacity) |
| } |
| |
| // TODO: we would change this later to make storage always have cacher and hide low level KV layer inside. |
| // Currently it has two layers of same storage interface -- cacher and low level kv. |
| cacherConfig := cacherstorage.Config{ |
| CacheCapacity: capacity, |
| Storage: s, |
| Versioner: etcdstorage.APIObjectVersioner{}, |
| ResourcePrefix: resourcePrefix, |
| KeyFunc: keyFunc, |
| NewFunc: newFunc, |
| NewListFunc: newListFunc, |
| GetAttrsFunc: getAttrsFunc, |
| TriggerPublisherFunc: triggerFunc, |
| Codec: storageConfig.Codec, |
| } |
| cacher := cacherstorage.NewCacherFromConfig(cacherConfig) |
| destroyFunc := func() { |
| cacher.Stop() |
| d() |
| } |
| |
| // TODO : Remove RegisterStorageCleanup below when PR |
| // https://github.com/kubernetes/kubernetes/pull/50690 |
| // merges as that shuts down storage properly |
| RegisterStorageCleanup(destroyFunc) |
| |
| return cacher, destroyFunc |
| } |
| } |
| |
| // TODO : Remove all the code below when PR |
| // https://github.com/kubernetes/kubernetes/pull/50690 |
| // merges as that shuts down storage properly |
| // HACK ALERT : Track the destroy methods to call them |
| // from the test harness. TrackStorageCleanup will be called |
| // only from the test harness, so Register/Cleanup will be |
| // no-op at runtime. |
| |
| var cleanupLock sync.Mutex |
| var cleanup []func() = nil |
| |
| func TrackStorageCleanup() { |
| cleanupLock.Lock() |
| defer cleanupLock.Unlock() |
| |
| if cleanup != nil { |
| panic("Conflicting storage tracking") |
| } |
| cleanup = make([]func(), 0) |
| } |
| |
| func RegisterStorageCleanup(fn func()) { |
| cleanupLock.Lock() |
| defer cleanupLock.Unlock() |
| |
| if cleanup == nil { |
| return |
| } |
| cleanup = append(cleanup, fn) |
| } |
| |
| func CleanupStorage() { |
| cleanupLock.Lock() |
| old := cleanup |
| cleanup = nil |
| cleanupLock.Unlock() |
| |
| for _, d := range old { |
| d() |
| } |
| } |