90 lines
2.8 KiB
Go
90 lines
2.8 KiB
Go
/*
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Copyright 2016 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 storage
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import (
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"k8s.io/apimachinery/pkg/fields"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/runtime"
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)
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// AttrFunc returns label and field sets for List or Watch to match.
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// In any failure to parse given object, it returns error.
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type AttrFunc func(obj runtime.Object) (labels.Set, fields.Set, error)
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// SelectionPredicate is used to represent the way to select objects from api storage.
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type SelectionPredicate struct {
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Label labels.Selector
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Field fields.Selector
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GetAttrs AttrFunc
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IndexFields []string
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}
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// Matches returns true if the given object's labels and fields (as
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// returned by s.GetAttrs) match s.Label and s.Field. An error is
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// returned if s.GetAttrs fails.
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func (s *SelectionPredicate) Matches(obj runtime.Object) (bool, error) {
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if s.Label.Empty() && s.Field.Empty() {
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return true, nil
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}
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labels, fields, err := s.GetAttrs(obj)
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if err != nil {
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return false, err
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}
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matched := s.Label.Matches(labels)
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if matched && s.Field != nil {
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matched = (matched && s.Field.Matches(fields))
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}
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return matched, nil
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}
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// MatchesLabelsAndFields returns true if the given labels and fields
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// match s.Label and s.Field.
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func (s *SelectionPredicate) MatchesLabelsAndFields(l labels.Set, f fields.Set) bool {
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if s.Label.Empty() && s.Field.Empty() {
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return true
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}
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matched := s.Label.Matches(l)
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if matched && s.Field != nil {
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matched = (matched && s.Field.Matches(f))
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}
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return matched
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}
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// MatchesSingle will return (name, true) if and only if s.Field matches on the object's
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// name.
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func (s *SelectionPredicate) MatchesSingle() (string, bool) {
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// TODO: should be namespace.name
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if name, ok := s.Field.RequiresExactMatch("metadata.name"); ok {
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return name, true
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}
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return "", false
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}
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// For any index defined by IndexFields, if a matcher can match only (a subset)
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// of objects that return <value> for a given index, a pair (<index name>, <value>)
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// wil be returned.
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// TODO: Consider supporting also labels.
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func (s *SelectionPredicate) MatcherIndex() []MatchValue {
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var result []MatchValue
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for _, field := range s.IndexFields {
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if value, ok := s.Field.RequiresExactMatch(field); ok {
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result = append(result, MatchValue{IndexName: field, Value: value})
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}
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}
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return result
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}
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