mirror of https://github.com/k3s-io/k3s
53 lines
1.7 KiB
Go
53 lines
1.7 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cache
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import (
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"fmt"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api/meta"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
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)
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// Indexer is a storage interface that lets you list objects using multiple indexing functions
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type Indexer interface {
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Store
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// Retrieve list of objects that match on the named indexing function
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Index(indexName string, obj interface{}) ([]interface{}, error)
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}
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// IndexFunc knows how to provide an indexed value for an object.
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type IndexFunc func(obj interface{}) (string, error)
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// MetaNamespaceIndexFunc is a default index function that indexes based on an object's namespace
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func MetaNamespaceIndexFunc(obj interface{}) (string, error) {
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meta, err := meta.Accessor(obj)
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if err != nil {
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return "", fmt.Errorf("object has no meta: %v", err)
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}
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return meta.Namespace(), nil
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}
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// Index maps the indexed value to a set of keys in the store that match on that value
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type Index map[string]util.StringSet
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// Indexers maps a name to a IndexFunc
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type Indexers map[string]IndexFunc
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// Indices maps a name to an Index
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type Indices map[string]Index
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