/
crd.go
289 lines (244 loc) · 6.55 KB
/
crd.go
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package controller
import (
"context"
"errors"
"fmt"
"sync"
internal "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions"
v1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
v1beta1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1"
"k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/cache"
"k8s.io/klog/v2"
"github.com/clusterpedia-io/clusterpedia/pkg/scheme"
"github.com/clusterpedia-io/clusterpedia/pkg/synchromanager/clustersynchro/informer"
)
type CRDController struct {
cluster string
client clientset.Interface
lock sync.Mutex
version string
rebuildCh chan struct{}
lastdone chan struct{}
store cache.Store
informer cache.Controller
handler cache.ResourceEventHandler
builder func() cache.Controller
}
func NewCRDController(cluster string, config *rest.Config, version string, handler CRDEventHandlerFuncs) (*CRDController, error) {
client, err := clientset.NewForConfig(config)
if err != nil {
return nil, err
}
controller := &CRDController{
cluster: cluster,
client: client,
handler: handler,
store: cache.NewStore(cache.DeletionHandlingMetaNamespaceKeyFunc),
rebuildCh: make(chan struct{}, 1),
lastdone: make(chan struct{}),
}
close(controller.lastdone)
if err := controller.SetVersion(version); err != nil {
return nil, err
}
return controller, nil
}
func (c *CRDController) Start(stopCh <-chan struct{}) <-chan struct{} {
done := make(chan struct{})
go func() {
defer close(done)
retry:
for {
c.lock.Lock()
lastdone := c.lastdone
select {
case <-lastdone:
select {
case <-stopCh:
c.lock.Unlock()
return
default:
break retry
}
case <-stopCh:
c.lock.Unlock()
return
default:
c.lock.Unlock()
}
select {
case <-lastdone:
case <-stopCh:
return
}
}
c.lastdone = done
c.informer = nil
c.lock.Unlock()
for {
stop := make(chan struct{})
c.lock.Lock()
select {
case <-c.rebuildCh:
default:
}
go func() {
defer close(stop)
select {
case <-stopCh:
case <-c.rebuildCh:
}
c.lock.Lock()
c.informer = nil
c.lock.Unlock()
}()
informer := c.builder()
c.informer = informer
c.lock.Unlock()
informer.Run(stop)
select {
case <-stopCh:
return
default:
}
}
}()
return done
}
func (c *CRDController) SetVersion(version string) error {
c.lock.Lock()
defer c.lock.Unlock()
if c.version == version {
return nil
}
var builder func() cache.Controller
switch version {
case v1.SchemeGroupVersion.Version:
builder = func() cache.Controller {
return informer.NewInformer(
&cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
return c.client.ApiextensionsV1().CustomResourceDefinitions().List(context.TODO(), options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
return c.client.ApiextensionsV1().CustomResourceDefinitions().Watch(context.TODO(), options)
},
},
&v1.CustomResourceDefinition{},
c.store,
0,
c.handler,
nil)
}
case v1beta1.SchemeGroupVersion.Version:
builder = func() cache.Controller {
return informer.NewInformer(
&cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
return c.client.ApiextensionsV1beta1().CustomResourceDefinitions().List(context.TODO(), options)
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
return c.client.ApiextensionsV1beta1().CustomResourceDefinitions().Watch(context.TODO(), options)
},
},
&v1beta1.CustomResourceDefinition{},
c.store,
0,
c.handler,
convertV1beta1ToV1)
}
default:
return fmt.Errorf("CRD Version %s is not supported", version)
}
c.version = version
c.builder = builder
c.informer = nil
select {
case c.rebuildCh <- struct{}{}:
default:
}
return nil
}
func (c *CRDController) HasSynced() bool {
c.lock.Lock()
defer c.lock.Unlock()
select {
case <-c.lastdone:
return false
default:
}
if c.informer == nil {
return false
}
return c.informer.HasSynced()
}
func convertV1beta1ToV1(obj interface{}) (interface{}, error) {
if _, ok := obj.(cache.DeletedFinalStateUnknown); ok {
return obj, nil
}
internal, err := scheme.LegacyResourceScheme.ConvertToVersion(obj.(runtime.Object), internal.SchemeGroupVersion)
if err != nil {
return nil, err
}
return scheme.LegacyResourceScheme.ConvertToVersion(internal, v1.SchemeGroupVersion)
}
type CRDEventHandlerFuncs struct {
Name string
AddFunc func(obj *v1.CustomResourceDefinition)
UpdateFunc func(older *v1.CustomResourceDefinition, newer *v1.CustomResourceDefinition)
UpdateFuncOnlyNewer func(newer *v1.CustomResourceDefinition)
// cache.DeletedFinalStateUnknown will be ignored
DeleteFunc func(obj *v1.CustomResourceDefinition)
}
func (handler CRDEventHandlerFuncs) OnAdd(obj interface{}, isInInitialList bool) {
if handler.AddFunc == nil {
return
}
crd, ok := obj.(*v1.CustomResourceDefinition)
if !ok {
klog.ErrorS(errors.New("CRDEventHandler OnAdd: newer obj is not *v1.CustomResourceDefinition"), "cluster", handler.Name)
return
}
handler.AddFunc(crd)
}
func (handler CRDEventHandlerFuncs) OnUpdate(older, newer interface{}) {
if handler.UpdateFunc == nil && handler.UpdateFuncOnlyNewer == nil {
return
}
newerCRD, ok := newer.(*v1.CustomResourceDefinition)
if !ok {
klog.ErrorS(errors.New("CRDEventHandler OnUpdate: newer obj is not *v1.CustomResourceDefinition"), "cluster", handler.Name)
return
}
if handler.UpdateFunc != nil {
olderCRD, ok := older.(*v1.CustomResourceDefinition)
if !ok {
klog.ErrorS(errors.New("CRDEventHandler OnUpdate: older obj is not *v1.CustomResourceDefinition"), "cluster", handler.Name)
return
}
handler.UpdateFunc(olderCRD, newerCRD)
}
if handler.UpdateFuncOnlyNewer != nil {
handler.UpdateFuncOnlyNewer(newerCRD)
}
}
func (handler CRDEventHandlerFuncs) OnDelete(obj interface{}) {
if tombstone, ok := obj.(cache.DeletedFinalStateUnknown); ok {
if tombstone.Obj == nil {
// klog.ErrorS(errors.New("Couldn't get object from tombstone"), "cluster", c.cluster, "object", obj)
return
}
obj = tombstone.Obj
}
crd, ok := obj.(*v1.CustomResourceDefinition)
if !ok {
klog.ErrorS(errors.New("CRDEventHandler OnDelete: obj is not *v1.CustomResourceDefinition"), "cluster", handler.Name)
return
}
handler.DeleteFunc(crd)
}