mirror of https://github.com/prometheus/prometheus
86 lines
2.8 KiB
Go
86 lines
2.8 KiB
Go
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/*
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Copyright 2014 The Kubernetes Authors.
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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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"k8s.io/apimachinery/pkg/api/meta"
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"k8s.io/apimachinery/pkg/util/sets"
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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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// ListIndexFuncValues returns the list of generated values of an Index func
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ListIndexFuncValues(indexName string) []string
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// ByIndex lists object that match on the named indexing function with the exact key
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ByIndex(indexName, indexKey string) ([]interface{}, error)
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// GetIndexer return the indexers
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GetIndexers() Indexers
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// AddIndexers adds more indexers to this store. If you call this after you already have data
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// in the store, the results are undefined.
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AddIndexers(newIndexers Indexers) 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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// IndexFuncToKeyFuncAdapter adapts an indexFunc to a keyFunc. This is only useful if your index function returns
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// unique values for every object. This is conversion can create errors when more than one key is found. You
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// should prefer to make proper key and index functions.
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func IndexFuncToKeyFuncAdapter(indexFunc IndexFunc) KeyFunc {
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return func(obj interface{}) (string, error) {
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indexKeys, err := indexFunc(obj)
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if err != nil {
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return "", err
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}
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if len(indexKeys) > 1 {
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return "", fmt.Errorf("too many keys: %v", indexKeys)
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}
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if len(indexKeys) == 0 {
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return "", fmt.Errorf("unexpected empty indexKeys")
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}
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return indexKeys[0], nil
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}
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}
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const (
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NamespaceIndex string = "namespace"
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)
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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 []string{""}, fmt.Errorf("object has no meta: %v", err)
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}
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return []string{meta.GetNamespace()}, 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]sets.String
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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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