102 lines
3.3 KiB
Go
102 lines
3.3 KiB
Go
/*
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Copyright 2017 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 configuration
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import (
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"fmt"
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"reflect"
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"sort"
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"github.com/golang/glog"
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"k8s.io/api/admissionregistration/v1alpha1"
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"k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime"
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)
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type MutatingWebhookConfigurationLister interface {
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List(opts metav1.ListOptions) (*v1alpha1.MutatingWebhookConfigurationList, error)
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}
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// MutatingWebhookConfigurationManager collects the mutating webhook objects so that they can be called.
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type MutatingWebhookConfigurationManager struct {
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*poller
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}
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func NewMutatingWebhookConfigurationManager(c MutatingWebhookConfigurationLister) *MutatingWebhookConfigurationManager {
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getFn := func() (runtime.Object, error) {
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list, err := c.List(metav1.ListOptions{})
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if err != nil {
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if errors.IsNotFound(err) || errors.IsForbidden(err) {
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glog.V(5).Infof("MutatingWebhookConfiguration are disabled due to an error: %v", err)
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return nil, ErrDisabled
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}
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return nil, err
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}
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return mergeMutatingWebhookConfigurations(list), nil
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}
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return &MutatingWebhookConfigurationManager{
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newPoller(getFn),
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}
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}
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// Webhooks returns the merged MutatingWebhookConfiguration.
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func (im *MutatingWebhookConfigurationManager) Webhooks() (*v1alpha1.MutatingWebhookConfiguration, error) {
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configuration, err := im.poller.configuration()
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if err != nil {
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return nil, err
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}
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mutatingWebhookConfiguration, ok := configuration.(*v1alpha1.MutatingWebhookConfiguration)
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if !ok {
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return nil, fmt.Errorf("expected type %v, got type %v", reflect.TypeOf(mutatingWebhookConfiguration), reflect.TypeOf(configuration))
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}
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return mutatingWebhookConfiguration, nil
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}
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func (im *MutatingWebhookConfigurationManager) Run(stopCh <-chan struct{}) {
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im.poller.Run(stopCh)
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}
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func mergeMutatingWebhookConfigurations(
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list *v1alpha1.MutatingWebhookConfigurationList,
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) *v1alpha1.MutatingWebhookConfiguration {
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configurations := append([]v1alpha1.MutatingWebhookConfiguration{}, list.Items...)
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var ret v1alpha1.MutatingWebhookConfiguration
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// The internal order of webhooks for each configuration is provided by the user
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// but configurations themselves can be in any order. As we are going to run these
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// webhooks in serial, they are sorted here to have a deterministic order.
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sort.Sort(byName(configurations))
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for _, c := range configurations {
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ret.Webhooks = append(ret.Webhooks, c.Webhooks...)
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}
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return &ret
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}
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// byName sorts MutatingWebhookConfiguration by name. These objects are all in
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// cluster namespace (aka no namespace) thus they all have unique names.
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type byName []v1alpha1.MutatingWebhookConfiguration
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func (x byName) Len() int { return len(x) }
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func (x byName) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
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func (x byName) Less(i, j int) bool {
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return x[i].ObjectMeta.Name < x[j].ObjectMeta.Name
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}
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