mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-30 00:40:21 +00:00
ff3e84ad67
updating kubernetes to 1.28.0 in the main repo. Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
296 lines
9.3 KiB
Go
296 lines
9.3 KiB
Go
/*
|
|
Copyright 2014 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 cache
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
|
|
"k8s.io/apimachinery/pkg/api/meta"
|
|
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
|
|
)
|
|
|
|
// Store is a generic object storage and processing interface. A
|
|
// Store holds a map from string keys to accumulators, and has
|
|
// operations to add, update, and delete a given object to/from the
|
|
// accumulator currently associated with a given key. A Store also
|
|
// knows how to extract the key from a given object, so many operations
|
|
// are given only the object.
|
|
//
|
|
// In the simplest Store implementations each accumulator is simply
|
|
// the last given object, or empty after Delete, and thus the Store's
|
|
// behavior is simple storage.
|
|
//
|
|
// Reflector knows how to watch a server and update a Store. This
|
|
// package provides a variety of implementations of Store.
|
|
type Store interface {
|
|
|
|
// Add adds the given object to the accumulator associated with the given object's key
|
|
Add(obj interface{}) error
|
|
|
|
// Update updates the given object in the accumulator associated with the given object's key
|
|
Update(obj interface{}) error
|
|
|
|
// Delete deletes the given object from the accumulator associated with the given object's key
|
|
Delete(obj interface{}) error
|
|
|
|
// List returns a list of all the currently non-empty accumulators
|
|
List() []interface{}
|
|
|
|
// ListKeys returns a list of all the keys currently associated with non-empty accumulators
|
|
ListKeys() []string
|
|
|
|
// Get returns the accumulator associated with the given object's key
|
|
Get(obj interface{}) (item interface{}, exists bool, err error)
|
|
|
|
// GetByKey returns the accumulator associated with the given key
|
|
GetByKey(key string) (item interface{}, exists bool, err error)
|
|
|
|
// Replace will delete the contents of the store, using instead the
|
|
// given list. Store takes ownership of the list, you should not reference
|
|
// it after calling this function.
|
|
Replace([]interface{}, string) error
|
|
|
|
// Resync is meaningless in the terms appearing here but has
|
|
// meaning in some implementations that have non-trivial
|
|
// additional behavior (e.g., DeltaFIFO).
|
|
Resync() error
|
|
}
|
|
|
|
// KeyFunc knows how to make a key from an object. Implementations should be deterministic.
|
|
type KeyFunc func(obj interface{}) (string, error)
|
|
|
|
// KeyError will be returned any time a KeyFunc gives an error; it includes the object
|
|
// at fault.
|
|
type KeyError struct {
|
|
Obj interface{}
|
|
Err error
|
|
}
|
|
|
|
// Error gives a human-readable description of the error.
|
|
func (k KeyError) Error() string {
|
|
return fmt.Sprintf("couldn't create key for object %+v: %v", k.Obj, k.Err)
|
|
}
|
|
|
|
// Unwrap implements errors.Unwrap
|
|
func (k KeyError) Unwrap() error {
|
|
return k.Err
|
|
}
|
|
|
|
// ExplicitKey can be passed to MetaNamespaceKeyFunc if you have the key for
|
|
// the object but not the object itself.
|
|
type ExplicitKey string
|
|
|
|
// MetaNamespaceKeyFunc is a convenient default KeyFunc which knows how to make
|
|
// keys for API objects which implement meta.Interface.
|
|
// The key uses the format <namespace>/<name> unless <namespace> is empty, then
|
|
// it's just <name>.
|
|
//
|
|
// Clients that want a structured alternative can use ObjectToName or MetaObjectToName.
|
|
// Note: this would not be a client that wants a key for a Store because those are
|
|
// necessarily strings.
|
|
//
|
|
// TODO maybe some day?: change Store to be keyed differently
|
|
func MetaNamespaceKeyFunc(obj interface{}) (string, error) {
|
|
if key, ok := obj.(ExplicitKey); ok {
|
|
return string(key), nil
|
|
}
|
|
objName, err := ObjectToName(obj)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
return objName.String(), nil
|
|
}
|
|
|
|
// ObjectToName returns the structured name for the given object,
|
|
// if indeed it can be viewed as a metav1.Object.
|
|
func ObjectToName(obj interface{}) (ObjectName, error) {
|
|
meta, err := meta.Accessor(obj)
|
|
if err != nil {
|
|
return ObjectName{}, fmt.Errorf("object has no meta: %v", err)
|
|
}
|
|
return MetaObjectToName(meta), nil
|
|
}
|
|
|
|
// MetaObjectToName returns the structured name for the given object
|
|
func MetaObjectToName(obj metav1.Object) ObjectName {
|
|
if len(obj.GetNamespace()) > 0 {
|
|
return ObjectName{Namespace: obj.GetNamespace(), Name: obj.GetName()}
|
|
}
|
|
return ObjectName{Namespace: "", Name: obj.GetName()}
|
|
}
|
|
|
|
// SplitMetaNamespaceKey returns the namespace and name that
|
|
// MetaNamespaceKeyFunc encoded into key.
|
|
//
|
|
// TODO: replace key-as-string with a key-as-struct so that this
|
|
// packing/unpacking won't be necessary.
|
|
func SplitMetaNamespaceKey(key string) (namespace, name string, err error) {
|
|
parts := strings.Split(key, "/")
|
|
switch len(parts) {
|
|
case 1:
|
|
// name only, no namespace
|
|
return "", parts[0], nil
|
|
case 2:
|
|
// namespace and name
|
|
return parts[0], parts[1], nil
|
|
}
|
|
|
|
return "", "", fmt.Errorf("unexpected key format: %q", key)
|
|
}
|
|
|
|
// `*cache` implements Indexer in terms of a ThreadSafeStore and an
|
|
// associated KeyFunc.
|
|
type cache struct {
|
|
// cacheStorage bears the burden of thread safety for the cache
|
|
cacheStorage ThreadSafeStore
|
|
// keyFunc is used to make the key for objects stored in and retrieved from items, and
|
|
// should be deterministic.
|
|
keyFunc KeyFunc
|
|
}
|
|
|
|
var _ Store = &cache{}
|
|
|
|
// Add inserts an item into the cache.
|
|
func (c *cache) Add(obj interface{}) error {
|
|
key, err := c.keyFunc(obj)
|
|
if err != nil {
|
|
return KeyError{obj, err}
|
|
}
|
|
c.cacheStorage.Add(key, obj)
|
|
return nil
|
|
}
|
|
|
|
// Update sets an item in the cache to its updated state.
|
|
func (c *cache) Update(obj interface{}) error {
|
|
key, err := c.keyFunc(obj)
|
|
if err != nil {
|
|
return KeyError{obj, err}
|
|
}
|
|
c.cacheStorage.Update(key, obj)
|
|
return nil
|
|
}
|
|
|
|
// Delete removes an item from the cache.
|
|
func (c *cache) Delete(obj interface{}) error {
|
|
key, err := c.keyFunc(obj)
|
|
if err != nil {
|
|
return KeyError{obj, err}
|
|
}
|
|
c.cacheStorage.Delete(key)
|
|
return nil
|
|
}
|
|
|
|
// List returns a list of all the items.
|
|
// List is completely threadsafe as long as you treat all items as immutable.
|
|
func (c *cache) List() []interface{} {
|
|
return c.cacheStorage.List()
|
|
}
|
|
|
|
// ListKeys returns a list of all the keys of the objects currently
|
|
// in the cache.
|
|
func (c *cache) ListKeys() []string {
|
|
return c.cacheStorage.ListKeys()
|
|
}
|
|
|
|
// GetIndexers returns the indexers of cache
|
|
func (c *cache) GetIndexers() Indexers {
|
|
return c.cacheStorage.GetIndexers()
|
|
}
|
|
|
|
// Index returns a list of items that match on the index function
|
|
// Index is thread-safe so long as you treat all items as immutable
|
|
func (c *cache) Index(indexName string, obj interface{}) ([]interface{}, error) {
|
|
return c.cacheStorage.Index(indexName, obj)
|
|
}
|
|
|
|
// IndexKeys returns the storage keys of the stored objects whose set of
|
|
// indexed values for the named index includes the given indexed value.
|
|
// The returned keys are suitable to pass to GetByKey().
|
|
func (c *cache) IndexKeys(indexName, indexedValue string) ([]string, error) {
|
|
return c.cacheStorage.IndexKeys(indexName, indexedValue)
|
|
}
|
|
|
|
// ListIndexFuncValues returns the list of generated values of an Index func
|
|
func (c *cache) ListIndexFuncValues(indexName string) []string {
|
|
return c.cacheStorage.ListIndexFuncValues(indexName)
|
|
}
|
|
|
|
// ByIndex returns the stored objects whose set of indexed values
|
|
// for the named index includes the given indexed value.
|
|
func (c *cache) ByIndex(indexName, indexedValue string) ([]interface{}, error) {
|
|
return c.cacheStorage.ByIndex(indexName, indexedValue)
|
|
}
|
|
|
|
func (c *cache) AddIndexers(newIndexers Indexers) error {
|
|
return c.cacheStorage.AddIndexers(newIndexers)
|
|
}
|
|
|
|
// Get returns the requested item, or sets exists=false.
|
|
// Get is completely threadsafe as long as you treat all items as immutable.
|
|
func (c *cache) Get(obj interface{}) (item interface{}, exists bool, err error) {
|
|
key, err := c.keyFunc(obj)
|
|
if err != nil {
|
|
return nil, false, KeyError{obj, err}
|
|
}
|
|
return c.GetByKey(key)
|
|
}
|
|
|
|
// GetByKey returns the request item, or exists=false.
|
|
// GetByKey is completely threadsafe as long as you treat all items as immutable.
|
|
func (c *cache) GetByKey(key string) (item interface{}, exists bool, err error) {
|
|
item, exists = c.cacheStorage.Get(key)
|
|
return item, exists, nil
|
|
}
|
|
|
|
// Replace will delete the contents of 'c', using instead the given list.
|
|
// 'c' takes ownership of the list, you should not reference the list again
|
|
// after calling this function.
|
|
func (c *cache) Replace(list []interface{}, resourceVersion string) error {
|
|
items := make(map[string]interface{}, len(list))
|
|
for _, item := range list {
|
|
key, err := c.keyFunc(item)
|
|
if err != nil {
|
|
return KeyError{item, err}
|
|
}
|
|
items[key] = item
|
|
}
|
|
c.cacheStorage.Replace(items, resourceVersion)
|
|
return nil
|
|
}
|
|
|
|
// Resync is meaningless for one of these
|
|
func (c *cache) Resync() error {
|
|
return nil
|
|
}
|
|
|
|
// NewStore returns a Store implemented simply with a map and a lock.
|
|
func NewStore(keyFunc KeyFunc) Store {
|
|
return &cache{
|
|
cacheStorage: NewThreadSafeStore(Indexers{}, Indices{}),
|
|
keyFunc: keyFunc,
|
|
}
|
|
}
|
|
|
|
// NewIndexer returns an Indexer implemented simply with a map and a lock.
|
|
func NewIndexer(keyFunc KeyFunc, indexers Indexers) Indexer {
|
|
return &cache{
|
|
cacheStorage: NewThreadSafeStore(indexers, Indices{}),
|
|
keyFunc: keyFunc,
|
|
}
|
|
}
|