/
cache_reader.go
171 lines (132 loc) · 3.92 KB
/
cache_reader.go
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package informers
import (
"errors"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/tools/cache"
)
// ErrCacheReadOnly is returned for any attempted write.
var ErrCacheReadOnly = errors.New("cache is read-only")
// multiIndexer represents an object that can return a map of namespaces to
// indexers, e.g. a multiNamespaceIndexer instance.
type multiIndexer interface {
GetIndexers() map[string]cache.Indexer
}
type cacheReader struct {
indexer multiIndexer
}
var _ cache.Indexer = &cacheReader{}
// NewCacheReader returns a new cache reader which satisfies the cache.Indexer
// interface and provides read-only access across the underlying caches for the
// given cross-namespace indexer. The argument is any type with a GetIndexers
// method that returns a map of namespaces to indexers.
func NewCacheReader(indexer multiIndexer) cache.Indexer {
return &cacheReader{indexer: indexer}
}
func (c *cacheReader) Add(obj interface{}) error {
return ErrCacheReadOnly
}
func (c *cacheReader) Update(obj interface{}) error {
return ErrCacheReadOnly
}
func (c *cacheReader) Delete(obj interface{}) error {
return ErrCacheReadOnly
}
func (c *cacheReader) List() (res []interface{}) {
for _, idx := range c.indexer.GetIndexers() {
res = append(res, idx.List()...)
}
return res
}
func (c *cacheReader) ListKeys() (res []string) {
for _, idx := range c.indexer.GetIndexers() {
res = append(res, idx.ListKeys()...)
}
return res
}
func (c *cacheReader) GetIndexers() cache.Indexers {
res := cache.Indexers{}
for _, idx := range c.indexer.GetIndexers() {
for k, v := range idx.GetIndexers() {
res[k] = v
}
}
return res
}
func (c *cacheReader) Index(indexName string, obj interface{}) (res []interface{}, err error) {
for _, idx := range c.indexer.GetIndexers() {
objs, err := idx.Index(indexName, obj)
if err != nil {
return nil, err
}
res = append(res, objs...)
}
return res, nil
}
func (c *cacheReader) IndexKeys(indexName, indexKey string) (res []string, err error) {
for _, idx := range c.indexer.GetIndexers() {
keys, err := idx.IndexKeys(indexName, indexKey)
if err != nil {
return nil, err
}
res = append(res, keys...)
}
return res, nil
}
func (c *cacheReader) ListIndexFuncValues(indexName string) (res []string) {
for _, idx := range c.indexer.GetIndexers() {
res = append(res, idx.ListIndexFuncValues(indexName)...)
}
return res
}
func (c *cacheReader) ByIndex(indexName, indexKey string) (res []interface{}, err error) {
for _, idx := range c.indexer.GetIndexers() {
keys, err := idx.ByIndex(indexName, indexKey)
if err != nil {
return nil, err // TODO: Multi-error?
}
res = append(res, keys...)
}
return res, nil
}
func (c *cacheReader) AddIndexers(newIndexers cache.Indexers) error {
return ErrCacheReadOnly
}
func (c *cacheReader) Get(obj interface{}) (item interface{}, exists bool, err error) {
accessor, err := meta.Accessor(obj)
if err != nil {
return nil, false, err
}
namespace := accessor.GetNamespace()
idx, ok := c.indexerForNamespace(namespace)
if !ok {
return nil, false, nil // TODO: Should this return an error?
}
return idx.Get(obj)
}
func (c *cacheReader) GetByKey(key string) (item interface{}, exists bool, err error) {
namespace, _, err := cache.SplitMetaNamespaceKey(key)
if err != nil {
return nil, false, err
}
idx, ok := c.indexerForNamespace(namespace)
if !ok {
return nil, false, nil // TODO: Should this return an error?
}
return idx.GetByKey(key)
}
func (c *cacheReader) Replace(list []interface{}, resourceVersion string) error {
return ErrCacheReadOnly
}
func (c *cacheReader) Resync() error {
return nil
}
func (c *cacheReader) indexerForNamespace(namespace string) (cache.Indexer, bool) {
indexers := c.indexer.GetIndexers()
if idx, ok := indexers[metav1.NamespaceAll]; ok {
return idx, true
} else if idx, ok := indexers[namespace]; ok {
return idx, true
}
return nil, false
}