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controller.go
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controller.go
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// Copyright 2022 Antrea Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package externalnode
import (
"context"
"fmt"
"reflect"
"time"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
"k8s.io/klog/v2"
"antrea.io/antrea/pkg/apis/crd/v1alpha1"
"antrea.io/antrea/pkg/apis/crd/v1alpha2"
clientset "antrea.io/antrea/pkg/client/clientset/versioned"
externalnodeinformers "antrea.io/antrea/pkg/client/informers/externalversions/crd/v1alpha1"
externalentityinformers "antrea.io/antrea/pkg/client/informers/externalversions/crd/v1alpha2"
externalnodelisters "antrea.io/antrea/pkg/client/listers/crd/v1alpha1"
externalentitylisters "antrea.io/antrea/pkg/client/listers/crd/v1alpha2"
"antrea.io/antrea/pkg/util/externalnode"
"antrea.io/antrea/pkg/util/k8s"
)
const (
controllerName = "ExternalNodeController"
// How long to wait before retrying the processing of an ExternalNode change.
minRetryDelay = 5 * time.Second
maxRetryDelay = 300 * time.Second
// Default number of workers processing ExternalNode changes.
defaultWorkers = 4
// Set resyncPeriod to 0 to disable resyncing.
resyncPeriod time.Duration = 0
)
var (
keyFunc = cache.DeletionHandlingMetaNamespaceKeyFunc
splitKeyFunc = cache.SplitMetaNamespaceKey
)
type ExternalNodeController struct {
crdClient clientset.Interface
externalNodeInformer externalnodeinformers.ExternalNodeInformer
externalNodeLister externalnodelisters.ExternalNodeLister
externalNodeListerSynced cache.InformerSynced
externalEntityInformer externalentityinformers.ExternalEntityInformer
externalEntityLister externalentitylisters.ExternalEntityLister
externalEntityListerSynced cache.InformerSynced
syncedExternalNode cache.Store
// queue maintains the ExternalNode objects that need to be synced.
queue workqueue.RateLimitingInterface
}
func NewExternalNodeController(crdClient clientset.Interface, externalNodeInformer externalnodeinformers.ExternalNodeInformer,
externalEntityInformer externalentityinformers.ExternalEntityInformer) *ExternalNodeController {
c := &ExternalNodeController{
crdClient: crdClient,
externalNodeInformer: externalNodeInformer,
externalNodeLister: externalNodeInformer.Lister(),
externalNodeListerSynced: externalNodeInformer.Informer().HasSynced,
externalEntityInformer: externalEntityInformer,
externalEntityLister: externalEntityInformer.Lister(),
externalEntityListerSynced: externalEntityInformer.Informer().HasSynced,
syncedExternalNode: cache.NewStore(keyFunc),
queue: workqueue.NewNamedRateLimitingQueue(workqueue.NewItemExponentialFailureRateLimiter(minRetryDelay, maxRetryDelay), "externalnode"),
}
c.externalNodeInformer.Informer().AddEventHandlerWithResyncPeriod(
cache.ResourceEventHandlerFuncs{
AddFunc: c.enqueueExternalNodeAdd,
UpdateFunc: c.enqueueExternalNodeUpdate,
DeleteFunc: c.enqueueExternalNodeDelete,
},
resyncPeriod)
return c
}
func (c *ExternalNodeController) enqueueExternalNodeAdd(obj interface{}) {
en := obj.(*v1alpha1.ExternalNode)
key, _ := keyFunc(en)
c.queue.Add(key)
klog.InfoS("Enqueued ExternalNode ADD event", "ExternalNode", klog.KObj(en))
}
func (c *ExternalNodeController) enqueueExternalNodeUpdate(oldObj interface{}, newObj interface{}) {
en := newObj.(*v1alpha1.ExternalNode)
key, _ := keyFunc(en)
c.queue.Add(key)
klog.InfoS("Enqueued ExternalNode UPDATE event", "ExternalNode", klog.KObj(en))
}
func (c *ExternalNodeController) enqueueExternalNodeDelete(obj interface{}) {
en := obj.(*v1alpha1.ExternalNode)
key, _ := keyFunc(en)
c.queue.Add(key)
klog.InfoS("Enqueued ExternalNode DELETE event", "ExternalNode", klog.KObj(en))
}
// Run will create defaultWorkers workers (goroutines) which will process the ExternalEntity events from the work queue.
func (c *ExternalNodeController) Run(stopCh <-chan struct{}) {
defer c.queue.ShutDown()
klog.InfoS("Starting", "controllerName", controllerName)
defer klog.InfoS("Shutting down", "controllerName", controllerName)
if !cache.WaitForNamedCacheSync(controllerName, stopCh, c.externalNodeListerSynced, c.externalEntityListerSynced) {
return
}
if err := c.reconcileExternalNodes(); err != nil {
klog.ErrorS(err, "Failed to reconcile ExternalNodes")
return
}
for i := 0; i < defaultWorkers; i++ {
go wait.Until(c.worker, time.Second, stopCh)
}
<-stopCh
}
// reconcileExternalNodes reconciles all the existing ExternalNodes and cleans up the stale ExternalEntities.
func (c *ExternalNodeController) reconcileExternalNodes() error {
externalNodes, err := c.externalNodeLister.List(labels.Everything())
if err != nil {
return err
}
enUIDEENameMap := make(map[types.UID]string)
for _, en := range externalNodes {
if err = c.addExternalNode(en); err != nil {
return err
}
eeName, err := externalnode.GenExternalEntityName(en)
if err != nil {
return err
}
enUIDEENameMap[en.UID] = eeName
}
externalEntities, err := c.externalEntityLister.List(labels.Everything())
if err != nil {
return err
}
for _, ee := range externalEntities {
if (len(ee.OwnerReferences) > 0) && (ee.OwnerReferences[0].Kind == "ExternalNode") {
// Clean up stale ExternalEntities when ExternalNode no longer exists or
// when interface[0] name is changed.
if eeName, ok := enUIDEENameMap[ee.OwnerReferences[0].UID]; !ok || (ok && (eeName != ee.Name)) {
err = c.crdClient.CrdV1alpha2().ExternalEntities(ee.Namespace).Delete(context.TODO(), ee.Name, metav1.DeleteOptions{})
if err != nil {
return err
}
}
}
}
return nil
}
// worker is a long-running function that will continually call the processNextWorkItem function in
// order to read and process a message on the work queue.
func (c *ExternalNodeController) worker() {
for c.processNextWorkItem() {
}
}
func (c *ExternalNodeController) processNextWorkItem() bool {
obj, quit := c.queue.Get()
if quit {
return false
}
defer c.queue.Done(obj)
if key, ok := obj.(string); !ok {
c.queue.Forget(obj)
klog.Errorf("Expected string in ExternalNode work queue but got %#v", obj)
return true
} else if err := c.syncExternalNode(key); err == nil {
// If no error occurs we Forget this item so it does not get queued again until
// another change happens.
c.queue.Forget(key)
} else {
// Put the item back on the workqueue to handle any transient errors.
c.queue.AddRateLimited(key)
klog.ErrorS(err, "Error syncing ExternalNode", "ExternalNode", key)
}
return true
}
func (c *ExternalNodeController) syncExternalNode(key string) error {
namespace, name, err := splitKeyFunc(key)
if err != nil {
// This err should not occur.
return err
}
en, err := c.externalNodeLister.ExternalNodes(namespace).Get(name)
if errors.IsNotFound(err) {
return c.deleteExternalNode(namespace, name)
}
preEn, exists, _ := c.syncedExternalNode.GetByKey(key)
if !exists {
return c.addExternalNode(en)
} else {
return c.updateExternalNode(preEn.(*v1alpha1.ExternalNode), en)
}
}
// addExternalNode creates ExternalEntity for each NetworkInterface in the ExternalNode.
// Only one interface is supported for now and there should be one ExternalEntity generated for one ExternalNode.
func (c *ExternalNodeController) addExternalNode(en *v1alpha1.ExternalNode) error {
eeName, err := externalnode.GenExternalEntityName(en)
if err != nil {
return err
}
ee, err := genExternalEntity(eeName, en)
if err != nil {
return err
}
err = c.createExternalEntity(ee)
if err != nil {
return err
}
c.syncedExternalNode.Add(en)
return nil
}
func (c *ExternalNodeController) createExternalEntity(ee *v1alpha2.ExternalEntity) error {
_, err := c.crdClient.CrdV1alpha2().ExternalEntities(ee.Namespace).Create(context.TODO(), ee, metav1.CreateOptions{})
if errors.IsAlreadyExists(err) {
klog.InfoS("Update ExternalEntity instead of creating it as it already exists", "ExternalEntity", klog.KObj(ee))
return c.updateExternalEntity(ee)
}
return err
}
func (c *ExternalNodeController) updateExternalNode(preEn *v1alpha1.ExternalNode, curEn *v1alpha1.ExternalNode) error {
if reflect.DeepEqual(preEn.Spec.Interfaces, curEn.Spec.Interfaces) && reflect.DeepEqual(preEn.Labels, curEn.Labels) {
return nil
}
// Delete the previous ExternalEntity and create a new one if the name of the generated ExternalEntity is changed.
// Otherwise, update the ExternalEntity.
preEEName, err := externalnode.GenExternalEntityName(preEn)
if err != nil {
return err
}
curEEName, err := externalnode.GenExternalEntityName(curEn)
if err != nil {
return err
}
if preEEName != curEEName {
if err = c.deleteExternalEntity(preEn.Namespace, preEEName); err != nil {
return err
}
curEE, err := genExternalEntity(curEEName, curEn)
if err != nil {
return err
}
if err = c.createExternalEntity(curEE); err != nil {
return err
}
} else {
preIPs := sets.New[string](preEn.Spec.Interfaces[0].IPs...)
curIPs := sets.New[string](curEn.Spec.Interfaces[0].IPs...)
if (!reflect.DeepEqual(preEn.Labels, curEn.Labels)) || (!preIPs.Equal(curIPs)) {
updatedEE, err := genExternalEntity(curEEName, curEn)
if err != nil {
return err
}
if err = c.updateExternalEntity(updatedEE); err != nil {
return err
}
}
}
c.syncedExternalNode.Update(curEn)
return nil
}
func (c *ExternalNodeController) updateExternalEntity(ee *v1alpha2.ExternalEntity) error {
// resourceVersion must be specified for update operation,
// so it gets the existing ExternalEntity and modifies the changed fields.
existingEE, err := c.crdClient.CrdV1alpha2().ExternalEntities(ee.Namespace).Get(context.TODO(), ee.Name, metav1.GetOptions{})
if err != nil {
if errors.IsNotFound(err) {
_, err = c.crdClient.CrdV1alpha2().ExternalEntities(ee.Namespace).Create(context.TODO(), ee, metav1.CreateOptions{})
if err != nil {
klog.ErrorS(err, "Failed to create ExternalEntity", "entityName", ee.Name, "entityNamespace", ee.Namespace)
return err
}
return nil
}
klog.ErrorS(err, "Failed to get ExternalEntity", "entityName", ee.Name, "entityNamespace", ee.Namespace)
return err
}
isChanged := false
if !reflect.DeepEqual(existingEE.Spec, ee.Spec) {
existingEE.Spec = ee.Spec
isChanged = true
}
if !reflect.DeepEqual(existingEE.Labels, ee.Labels) {
existingEE.Labels = ee.Labels
isChanged = true
}
if isChanged {
_, err := c.crdClient.CrdV1alpha2().ExternalEntities(ee.Namespace).Update(context.TODO(), existingEE, metav1.UpdateOptions{})
if err != nil {
return err
}
}
return nil
}
func (c *ExternalNodeController) deleteExternalNode(namespace string, name string) error {
obj, exists, _ := c.syncedExternalNode.GetByKey(k8s.NamespacedName(namespace, name))
if !exists {
klog.InfoS("Skipping deleting ExternalNode as it does not exist", "enName", namespace, "enNamespace", namespace)
return nil
}
en := obj.(*v1alpha1.ExternalNode)
eeName, err := externalnode.GenExternalEntityName(en)
if err != nil {
return err
}
err = c.deleteExternalEntity(namespace, eeName)
if err != nil {
return err
}
c.syncedExternalNode.Delete(en)
return nil
}
func (c *ExternalNodeController) deleteExternalEntity(namespace string, name string) error {
err := c.crdClient.CrdV1alpha2().ExternalEntities(namespace).Delete(context.TODO(), name, metav1.DeleteOptions{})
if errors.IsNotFound(err) {
klog.InfoS("Skipping deleting ExternalEntity as it is not found", "eeName", name, "eeNamespace", namespace)
return nil
}
return err
}
func genExternalEntity(eeName string, en *v1alpha1.ExternalNode) (*v1alpha2.ExternalEntity, error) {
ownerRef := &metav1.OwnerReference{
APIVersion: "crd.antrea.io/v1alpha1",
Kind: externalnode.EntityOwnerKind,
Name: en.GetName(),
UID: en.GetUID(),
}
endpoints := make([]v1alpha2.Endpoint, 0)
if len(en.Spec.Interfaces[0].IPs) == 0 {
// This should not happen since openAPIV3Schema checks it.
return nil, fmt.Errorf("failed to get IPs form Interfaces[0] from ExternalNode %s", en.Name)
}
// Generate one/multiple endpoint(s) if one/multiple IP(s) are specified for interface[0]
for _, ip := range en.Spec.Interfaces[0].IPs {
endpoints = append(endpoints, v1alpha2.Endpoint{
IP: ip,
Name: en.Spec.Interfaces[0].Name,
})
}
ee := &v1alpha2.ExternalEntity{
ObjectMeta: metav1.ObjectMeta{
Name: eeName,
Namespace: en.Namespace,
OwnerReferences: []metav1.OwnerReference{*ownerRef},
Labels: en.Labels,
},
Spec: v1alpha2.ExternalEntitySpec{
Endpoints: endpoints,
ExternalNode: en.Name,
},
}
return ee, nil
}