mirror of https://github.com/k3s-io/k3s
107 lines
3.4 KiB
Go
107 lines
3.4 KiB
Go
/*
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Copyright 2014 Google Inc. 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 generic
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import (
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"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/labels"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/watch"
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)
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// AttrFunc returns label and field sets for List or Watch to compare against, or an error.
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type AttrFunc func(obj runtime.Object) (label, field labels.Set, err error)
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// SelectionPredicate implements a generic predicate that can be passed to
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// GenericRegistry's List or Watch methods. Implements the Matcher interface.
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type SelectionPredicate struct {
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Label labels.Selector
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Field labels.Selector
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GetAttrs AttrFunc
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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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return s.Label.Matches(labels) && s.Field.Matches(fields), nil
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}
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// Matcher can return true if an object matches the Matcher's selection
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// criteria.
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type Matcher interface {
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Matches(obj runtime.Object) (bool, error)
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}
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// MatcherFunc makes a matcher from the provided function. For easy definition
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// of matchers for testing.
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func MatcherFunc(f func(obj runtime.Object) (bool, error)) Matcher {
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return matcherFunc(f)
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}
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type matcherFunc func(obj runtime.Object) (bool, error)
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// Matches calls the embedded function.
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func (m matcherFunc) Matches(obj runtime.Object) (bool, error) {
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return m(obj)
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}
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// Registry knows how to store & list any runtime.Object. Can be used for
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// any object types which don't require special features from the storage
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// layer.
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type Registry interface {
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List(api.Context, Matcher) (runtime.Object, error)
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Create(ctx api.Context, id string, obj runtime.Object) error
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Update(ctx api.Context, id string, obj runtime.Object) error
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Get(ctx api.Context, id string) (runtime.Object, error)
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Delete(ctx api.Context, id string) error
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Watch(ctx api.Context, m Matcher, resourceVersion uint64) (watch.Interface, error)
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}
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// FilterList filters any list object that conforms to the api conventions,
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// provided that 'm' works with the concrete type of list.
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func FilterList(list runtime.Object, m Matcher) (filtered runtime.Object, err error) {
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// TODO: push a matcher down into tools.EtcdHelper to avoid all this
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// nonsense. This is a lot of unnecessary copies.
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items, err := runtime.ExtractList(list)
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if err != nil {
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return nil, err
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}
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var filteredItems []runtime.Object
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for _, obj := range items {
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match, err := m.Matches(obj)
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if err != nil {
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return nil, err
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}
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if match {
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filteredItems = append(filteredItems, obj)
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}
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}
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err = runtime.SetList(list, filteredItems)
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if err != nil {
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return nil, err
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}
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return list, nil
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}
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