Matthias Andreas Benkard | 832a54e | 2019-01-29 09:27:38 +0100 | [diff] [blame] | 1 | /* |
| 2 | Copyright 2017 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 configuration |
| 18 | |
| 19 | import ( |
| 20 | "fmt" |
| 21 | "reflect" |
| 22 | "sort" |
| 23 | |
| 24 | "github.com/golang/glog" |
| 25 | |
| 26 | "k8s.io/api/admissionregistration/v1alpha1" |
| 27 | "k8s.io/apimachinery/pkg/api/errors" |
| 28 | metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" |
| 29 | "k8s.io/apimachinery/pkg/runtime" |
| 30 | ) |
| 31 | |
| 32 | type InitializerConfigurationLister interface { |
| 33 | List(opts metav1.ListOptions) (*v1alpha1.InitializerConfigurationList, error) |
| 34 | } |
| 35 | |
| 36 | type InitializerConfigurationManager struct { |
| 37 | *poller |
| 38 | } |
| 39 | |
| 40 | func NewInitializerConfigurationManager(c InitializerConfigurationLister) *InitializerConfigurationManager { |
| 41 | getFn := func() (runtime.Object, error) { |
| 42 | list, err := c.List(metav1.ListOptions{}) |
| 43 | if err != nil { |
| 44 | if errors.IsNotFound(err) || errors.IsForbidden(err) { |
| 45 | glog.V(5).Infof("Initializers are disabled due to an error: %v", err) |
| 46 | return nil, ErrDisabled |
| 47 | } |
| 48 | return nil, err |
| 49 | } |
| 50 | return mergeInitializerConfigurations(list), nil |
| 51 | } |
| 52 | return &InitializerConfigurationManager{ |
| 53 | newPoller(getFn), |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | // Initializers returns the merged InitializerConfiguration. |
| 58 | func (im *InitializerConfigurationManager) Initializers() (*v1alpha1.InitializerConfiguration, error) { |
| 59 | configuration, err := im.poller.configuration() |
| 60 | if err != nil { |
| 61 | return nil, err |
| 62 | } |
| 63 | initializerConfiguration, ok := configuration.(*v1alpha1.InitializerConfiguration) |
| 64 | if !ok { |
| 65 | return nil, fmt.Errorf("expected type %v, got type %v", reflect.TypeOf(initializerConfiguration), reflect.TypeOf(configuration)) |
| 66 | } |
| 67 | return initializerConfiguration, nil |
| 68 | } |
| 69 | |
| 70 | func (im *InitializerConfigurationManager) Run(stopCh <-chan struct{}) { |
| 71 | im.poller.Run(stopCh) |
| 72 | } |
| 73 | |
| 74 | func mergeInitializerConfigurations(initializerConfigurationList *v1alpha1.InitializerConfigurationList) *v1alpha1.InitializerConfiguration { |
| 75 | configurations := initializerConfigurationList.Items |
| 76 | sort.SliceStable(configurations, InitializerConfigurationSorter(configurations).ByName) |
| 77 | var ret v1alpha1.InitializerConfiguration |
| 78 | for _, c := range configurations { |
| 79 | ret.Initializers = append(ret.Initializers, c.Initializers...) |
| 80 | } |
| 81 | return &ret |
| 82 | } |
| 83 | |
| 84 | type InitializerConfigurationSorter []v1alpha1.InitializerConfiguration |
| 85 | |
| 86 | func (a InitializerConfigurationSorter) ByName(i, j int) bool { |
| 87 | return a[i].Name < a[j].Name |
| 88 | } |