Federated namespace controller
This commit is contained in:
Marcin Wielgus
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/*
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Copyright 2016 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 cluster
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import (
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"reflect"
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"time"
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federation_api "k8s.io/kubernetes/federation/apis/federation/v1beta1"
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federation_release_1_4 "k8s.io/kubernetes/federation/client/clientset_generated/federation_release_1_4"
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"k8s.io/kubernetes/federation/pkg/federation-controller/util"
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"k8s.io/kubernetes/pkg/api"
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api_v1 "k8s.io/kubernetes/pkg/api/v1"
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"k8s.io/kubernetes/pkg/client/cache"
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"k8s.io/kubernetes/pkg/controller"
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"k8s.io/kubernetes/pkg/controller/framework"
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pkg_runtime "k8s.io/kubernetes/pkg/runtime"
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"k8s.io/kubernetes/pkg/watch"
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"github.com/golang/glog"
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)
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const (
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NamespaceReviewDelay = time.Second * 10
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ClusterAvailableDelay = time.Second * 20
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SmallDelay = time.Second * 3
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UpdateTimeout = time.Second * 30
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allClustersKey = "ALL_CLUSTERS"
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)
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type NamespaceController struct {
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// For triggering single namespace reconcilation. This is used when there is an
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// add/update/delete operation on a namespace in either federated API server or
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// in some member of the federation.
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namespaceDeliverer *util.DelayingDeliverer
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// For triggering all namespaces reconcilation. This is used when
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// a new cluster becomes available.
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clusterDeliverer *util.DelayingDeliverer
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// Contains namespaces present in members of federation.
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namespaceFederatedInformer util.FederatedInformer
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// For updating members of federation.
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federatedUpdater util.FederatedUpdater
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// Definitions of namespaces that should be federated.
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namespaceInformerStore cache.Store
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// Informer controller for namespaces that should be federated.
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namespaceInformerController framework.ControllerInterface
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// Client to federated api server.
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federatedApiClient federation_release_1_4.Interface
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stopChan chan struct{}
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}
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// A structure passed by delying deliver. It contains a namespace that should be reconciled and
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// the number of trials that were made previously and ended up in some kind of namespace-related
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// error (like failure to create).
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type namespaceItem struct {
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namespace string
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trial int64
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}
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// NewNamespaceController returns a new namespace controller
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func NewNamespaceController(client federation_release_1_4.Interface) *NamespaceController {
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nc := &NamespaceController{
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federatedApiClient: client,
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stopChan: make(chan struct{}),
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}
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// Build delivereres for triggering reconcilations.
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nc.namespaceDeliverer = util.NewDelayingDeliverer()
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nc.clusterDeliverer = util.NewDelayingDeliverer()
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// Start informer in federated API servers on namespaces that should be federated.
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nc.namespaceInformerStore, nc.namespaceInformerController = framework.NewInformer(
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&cache.ListWatch{
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ListFunc: func(options api.ListOptions) (pkg_runtime.Object, error) {
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return client.Core().Namespaces().List(options)
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},
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WatchFunc: func(options api.ListOptions) (watch.Interface, error) {
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return client.Core().Namespaces().Watch(options)
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},
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},
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&api.Namespace{},
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controller.NoResyncPeriodFunc(),
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util.NewTriggerOnAllChanges(func(obj pkg_runtime.Object) { nc.deliverNamespaceObj(obj, 0, 0) }))
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// Federated informer on namespaces in members of federation.
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nc.namespaceFederatedInformer = util.NewFederatedInformer(
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client,
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func(cluster *federation_api.Cluster, targetClient federation_release_1_4.Interface) (cache.Store, framework.ControllerInterface) {
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return framework.NewInformer(
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&cache.ListWatch{
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ListFunc: func(options api.ListOptions) (pkg_runtime.Object, error) {
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return targetClient.Core().Namespaces().List(options)
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},
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WatchFunc: func(options api.ListOptions) (watch.Interface, error) {
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return targetClient.Core().Namespaces().Watch(options)
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},
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},
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&api.Namespace{},
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controller.NoResyncPeriodFunc(),
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// Trigger reconcilation whenever something in federated cluster is changed. In most cases it
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// would be just confirmation that some namespace opration suceeded.
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util.NewTriggerOnMetaAndSpecChangesPreproc(
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func(obj pkg_runtime.Object) { nc.deliverNamespaceObj(obj, NamespaceReviewDelay, 0) },
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func(obj pkg_runtime.Object) { util.SetClusterName(obj, cluster.Name) },
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))
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},
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&util.ClusterLifecycleHandlerFuncs{
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ClusterAvailable: func(cluster *federation_api.Cluster) {
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// When new cluster becomes available process all the namespaces again.
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nc.clusterDeliverer.DeliverAt(allClustersKey, nil, time.Now().Add(ClusterAvailableDelay))
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},
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},
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)
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// Federated updeater along with Create/Update/Delete operations.
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nc.federatedUpdater = util.NewFederatedUpdater(nc.namespaceFederatedInformer,
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func(client federation_release_1_4.Interface, obj pkg_runtime.Object) error {
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namespace := obj.(*api_v1.Namespace)
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_, err := client.Core().Namespaces().Create(namespace)
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return err
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},
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func(client federation_release_1_4.Interface, obj pkg_runtime.Object) error {
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namespace := obj.(*api_v1.Namespace)
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_, err := client.Core().Namespaces().Update(namespace)
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return err
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},
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func(client federation_release_1_4.Interface, obj pkg_runtime.Object) error {
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namespace := obj.(*api_v1.Namespace)
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err := client.Core().Namespaces().Delete(namespace.Name, &api.DeleteOptions{})
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return err
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})
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return nc
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}
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func (nc *NamespaceController) Start() {
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nc.namespaceInformerController.Run(nc.stopChan)
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nc.namespaceFederatedInformer.Start()
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nc.namespaceDeliverer.StartWithHandler(func(item *util.DelayingDelivererItem) {
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ni := item.Value.(*namespaceItem)
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nc.reconcileNamespace(ni.namespace, ni.trial)
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})
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nc.clusterDeliverer.StartWithHandler(func(_ *util.DelayingDelivererItem) {
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nc.reconcileNamespacesOnClusterChange()
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})
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}
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func (nc *NamespaceController) Stop() {
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nc.namespaceFederatedInformer.Stop()
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close(nc.stopChan)
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}
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func (nc *NamespaceController) deliverNamespaceObj(obj interface{}, delay time.Duration, trial int64) {
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namespace := obj.(*api.Namespace)
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nc.deliverNamespace(namespace.Name, delay, trial)
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}
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func (nc *NamespaceController) deliverNamespace(namespace string, delay time.Duration, trial int64) {
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nc.namespaceDeliverer.DeliverAfter(namespace, &namespaceItem{namespace: namespace, trial: trial}, delay)
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}
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// Check whether all data stores are in sync. False is returned if any of the informer/stores is not yet
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// synced with the coresponding api server.
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func (nc *NamespaceController) isSynced() bool {
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if !nc.namespaceFederatedInformer.ClustersSynced() {
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glog.V(2).Infof("Cluster list not synced")
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return false
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}
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clusters, err := nc.namespaceFederatedInformer.GetReadyClusters()
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if err != nil {
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glog.Errorf("Failed to get ready clusters: %v", err)
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return false
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}
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if !nc.namespaceFederatedInformer.GetTargetStore().ClustersSynced(clusters) {
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return false
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}
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return true
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}
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// The function triggers reconcilation of all federated namespaces.
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func (nc *NamespaceController) reconcileNamespacesOnClusterChange() {
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if !nc.isSynced() {
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nc.clusterDeliverer.DeliverAt(allClustersKey, nil, time.Now().Add(ClusterAvailableDelay))
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}
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for _, obj := range nc.namespaceInformerStore.List() {
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namespace := obj.(*api_v1.Namespace)
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nc.deliverNamespace(namespace.Name, SmallDelay, 0)
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}
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}
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func backoff(trial int64) time.Duration {
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if trial > 12 {
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return 12 * 5 * time.Second
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}
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return time.Duration(trial) * 5 * time.Second
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}
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func (nc *NamespaceController) reconcileNamespace(namespace string, trial int64) {
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if !nc.isSynced() {
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nc.deliverNamespace(namespace, ClusterAvailableDelay, trial)
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}
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baseNamespaceObj, exist, err := nc.namespaceInformerStore.GetByKey(namespace)
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if err != nil {
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glog.Errorf("Failed to query main namespace store for %v: %v", namespace, err)
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nc.deliverNamespace(namespace, backoff(trial+1), trial+1)
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return
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}
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if !exist {
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// Not federated namespace, ignoring.
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return
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}
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baseNamespace := baseNamespaceObj.(*api_v1.Namespace)
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if baseNamespace.Status.Phase == api_v1.NamespaceTerminating {
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// TODO: What about namespaces in subclusters ???
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err = nc.federatedApiClient.Core().Namespaces().Delete(baseNamespace.Name, &api.DeleteOptions{})
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if err != nil {
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glog.Errorf("Failed to delete namespace %s: %v", baseNamespace.Name, err)
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nc.deliverNamespace(namespace, backoff(trial+1), trial+1)
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}
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return
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}
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clusters, err := nc.namespaceFederatedInformer.GetReadyClusters()
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if err != nil {
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glog.Errorf("Failed to get cluster list: %v", err)
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nc.deliverNamespace(namespace, ClusterAvailableDelay, trial)
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return
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}
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operations := make([]util.FederatedOperation, 0)
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for _, cluster := range clusters {
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clusterNamespaceObj, found, err := nc.namespaceFederatedInformer.GetTargetStore().GetByKey(cluster.Name, namespace)
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if err != nil {
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glog.Errorf("Failed to get %s from %s: %v", namespace, cluster.Name, err)
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nc.deliverNamespace(namespace, backoff(trial+1), trial+1)
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return
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}
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desiredNamespace := &api_v1.Namespace{
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ObjectMeta: baseNamespace.ObjectMeta,
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Spec: baseNamespace.Spec,
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}
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util.SetClusterName(desiredNamespace, cluster.Name)
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if !found {
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operations = append(operations, util.FederatedOperation{
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Type: util.OperationTypeAdd,
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Obj: desiredNamespace,
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})
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} else {
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clusterNamespace := clusterNamespaceObj.(*api_v1.Namespace)
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// Update existing namespace, if needed.
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if !reflect.DeepEqual(desiredNamespace.ObjectMeta, clusterNamespace.ObjectMeta) ||
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!reflect.DeepEqual(desiredNamespace.Spec, clusterNamespace.Spec) {
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operations = append(operations, util.FederatedOperation{
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Type: util.OperationTypeUpdate,
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Obj: desiredNamespace,
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})
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}
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}
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}
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if len(operations) == 0 {
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// Everything is in order
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return
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}
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err = nc.federatedUpdater.Update(operations, UpdateTimeout)
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if err != nil {
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glog.Errorf("Failed to execute updates for %s: %v", namespace, err)
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nc.deliverNamespace(namespace, backoff(trial+1), trial+1)
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return
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}
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// Evertyhing is in order but lets be double sure
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nc.deliverNamespace(namespace, NamespaceReviewDelay, 0)
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}
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