772ab8e1b4
Handle failure cases on startup gracefully to avoid causing cascading errors and poor initialization in other components. Initial errors from config load cause the initializer to pause and hold requests. Return typed errors to better communicate failures to clients. Add code to handle two specific cases - admin wants to bypass initialization defaulting, and mirror pods (which want to bypass initialization because the kubelet owns their lifecycle).
89 lines
2.7 KiB
Go
89 lines
2.7 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/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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"k8s.io/kubernetes/pkg/apis/admissionregistration/v1alpha1"
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)
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type InitializerConfigurationLister interface {
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List(opts metav1.ListOptions) (*v1alpha1.InitializerConfigurationList, error)
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}
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type InitializerConfigurationManager struct {
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*poller
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}
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func NewInitializerConfigurationManager(c InitializerConfigurationLister) *InitializerConfigurationManager {
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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("Initializers 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 mergeInitializerConfigurations(list), nil
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}
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return &InitializerConfigurationManager{
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newPoller(getFn),
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}
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}
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// Initializers returns the merged InitializerConfiguration.
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func (im *InitializerConfigurationManager) Initializers() (*v1alpha1.InitializerConfiguration, 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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initializerConfiguration, ok := configuration.(*v1alpha1.InitializerConfiguration)
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if !ok {
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return nil, fmt.Errorf("expected type %v, got type %v", reflect.TypeOf(initializerConfiguration), reflect.TypeOf(configuration))
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}
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return initializerConfiguration, nil
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}
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func (im *InitializerConfigurationManager) Run(stopCh <-chan struct{}) {
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im.poller.Run(stopCh)
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}
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func mergeInitializerConfigurations(initializerConfigurationList *v1alpha1.InitializerConfigurationList) *v1alpha1.InitializerConfiguration {
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configurations := initializerConfigurationList.Items
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sort.SliceStable(configurations, InitializerConfigurationSorter(configurations).ByName)
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var ret v1alpha1.InitializerConfiguration
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for _, c := range configurations {
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ret.Initializers = append(ret.Initializers, c.Initializers...)
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}
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return &ret
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}
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type InitializerConfigurationSorter []v1alpha1.InitializerConfiguration
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func (a InitializerConfigurationSorter) ByName(i, j int) bool {
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return a[i].Name < a[j].Name
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}
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