Matthias Andreas Benkard | 832a54e | 2019-01-29 09:27:38 +0100 | [diff] [blame] | 1 | /* |
| 2 | Copyright 2014 The Kubernetes Authors. |
| 3 | |
| 4 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | you may not use this file except in compliance with the License. |
| 6 | You may obtain a copy of the License at |
| 7 | |
| 8 | http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | |
| 10 | Unless required by applicable law or agreed to in writing, software |
| 11 | distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | See the License for the specific language governing permissions and |
| 14 | limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package cache |
| 18 | |
| 19 | import ( |
| 20 | "github.com/golang/glog" |
| 21 | |
| 22 | "k8s.io/apimachinery/pkg/api/errors" |
| 23 | "k8s.io/apimachinery/pkg/api/meta" |
| 24 | metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" |
| 25 | "k8s.io/apimachinery/pkg/labels" |
| 26 | "k8s.io/apimachinery/pkg/runtime" |
| 27 | "k8s.io/apimachinery/pkg/runtime/schema" |
| 28 | ) |
| 29 | |
| 30 | // AppendFunc is used to add a matching item to whatever list the caller is using |
| 31 | type AppendFunc func(interface{}) |
| 32 | |
| 33 | func ListAll(store Store, selector labels.Selector, appendFn AppendFunc) error { |
| 34 | for _, m := range store.List() { |
| 35 | metadata, err := meta.Accessor(m) |
| 36 | if err != nil { |
| 37 | return err |
| 38 | } |
| 39 | if selector.Matches(labels.Set(metadata.GetLabels())) { |
| 40 | appendFn(m) |
| 41 | } |
| 42 | } |
| 43 | return nil |
| 44 | } |
| 45 | |
| 46 | func ListAllByNamespace(indexer Indexer, namespace string, selector labels.Selector, appendFn AppendFunc) error { |
| 47 | if namespace == metav1.NamespaceAll { |
| 48 | for _, m := range indexer.List() { |
| 49 | metadata, err := meta.Accessor(m) |
| 50 | if err != nil { |
| 51 | return err |
| 52 | } |
| 53 | if selector.Matches(labels.Set(metadata.GetLabels())) { |
| 54 | appendFn(m) |
| 55 | } |
| 56 | } |
| 57 | return nil |
| 58 | } |
| 59 | |
| 60 | items, err := indexer.Index(NamespaceIndex, &metav1.ObjectMeta{Namespace: namespace}) |
| 61 | if err != nil { |
| 62 | // Ignore error; do slow search without index. |
| 63 | glog.Warningf("can not retrieve list of objects using index : %v", err) |
| 64 | for _, m := range indexer.List() { |
| 65 | metadata, err := meta.Accessor(m) |
| 66 | if err != nil { |
| 67 | return err |
| 68 | } |
| 69 | if metadata.GetNamespace() == namespace && selector.Matches(labels.Set(metadata.GetLabels())) { |
| 70 | appendFn(m) |
| 71 | } |
| 72 | |
| 73 | } |
| 74 | return nil |
| 75 | } |
| 76 | for _, m := range items { |
| 77 | metadata, err := meta.Accessor(m) |
| 78 | if err != nil { |
| 79 | return err |
| 80 | } |
| 81 | if selector.Matches(labels.Set(metadata.GetLabels())) { |
| 82 | appendFn(m) |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | return nil |
| 87 | } |
| 88 | |
| 89 | // GenericLister is a lister skin on a generic Indexer |
| 90 | type GenericLister interface { |
| 91 | // List will return all objects across namespaces |
| 92 | List(selector labels.Selector) (ret []runtime.Object, err error) |
| 93 | // Get will attempt to retrieve assuming that name==key |
| 94 | Get(name string) (runtime.Object, error) |
| 95 | // ByNamespace will give you a GenericNamespaceLister for one namespace |
| 96 | ByNamespace(namespace string) GenericNamespaceLister |
| 97 | } |
| 98 | |
| 99 | // GenericNamespaceLister is a lister skin on a generic Indexer |
| 100 | type GenericNamespaceLister interface { |
| 101 | // List will return all objects in this namespace |
| 102 | List(selector labels.Selector) (ret []runtime.Object, err error) |
| 103 | // Get will attempt to retrieve by namespace and name |
| 104 | Get(name string) (runtime.Object, error) |
| 105 | } |
| 106 | |
| 107 | func NewGenericLister(indexer Indexer, resource schema.GroupResource) GenericLister { |
| 108 | return &genericLister{indexer: indexer, resource: resource} |
| 109 | } |
| 110 | |
| 111 | type genericLister struct { |
| 112 | indexer Indexer |
| 113 | resource schema.GroupResource |
| 114 | } |
| 115 | |
| 116 | func (s *genericLister) List(selector labels.Selector) (ret []runtime.Object, err error) { |
| 117 | err = ListAll(s.indexer, selector, func(m interface{}) { |
| 118 | ret = append(ret, m.(runtime.Object)) |
| 119 | }) |
| 120 | return ret, err |
| 121 | } |
| 122 | |
| 123 | func (s *genericLister) ByNamespace(namespace string) GenericNamespaceLister { |
| 124 | return &genericNamespaceLister{indexer: s.indexer, namespace: namespace, resource: s.resource} |
| 125 | } |
| 126 | |
| 127 | func (s *genericLister) Get(name string) (runtime.Object, error) { |
| 128 | obj, exists, err := s.indexer.GetByKey(name) |
| 129 | if err != nil { |
| 130 | return nil, err |
| 131 | } |
| 132 | if !exists { |
| 133 | return nil, errors.NewNotFound(s.resource, name) |
| 134 | } |
| 135 | return obj.(runtime.Object), nil |
| 136 | } |
| 137 | |
| 138 | type genericNamespaceLister struct { |
| 139 | indexer Indexer |
| 140 | namespace string |
| 141 | resource schema.GroupResource |
| 142 | } |
| 143 | |
| 144 | func (s *genericNamespaceLister) List(selector labels.Selector) (ret []runtime.Object, err error) { |
| 145 | err = ListAllByNamespace(s.indexer, s.namespace, selector, func(m interface{}) { |
| 146 | ret = append(ret, m.(runtime.Object)) |
| 147 | }) |
| 148 | return ret, err |
| 149 | } |
| 150 | |
| 151 | func (s *genericNamespaceLister) Get(name string) (runtime.Object, error) { |
| 152 | obj, exists, err := s.indexer.GetByKey(s.namespace + "/" + name) |
| 153 | if err != nil { |
| 154 | return nil, err |
| 155 | } |
| 156 | if !exists { |
| 157 | return nil, errors.NewNotFound(s.resource, name) |
| 158 | } |
| 159 | return obj.(runtime.Object), nil |
| 160 | } |