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templateinstance_finalizer.go
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templateinstance_finalizer.go
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package controller
import (
"fmt"
"time"
"k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
kerrs "k8s.io/apimachinery/pkg/util/errors"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/discovery"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
"k8s.io/kubernetes/pkg/api/legacyscheme"
"k8s.io/utils/clock"
"github.com/golang/glog"
templateapi "github.com/openshift/origin/pkg/template/apis/template"
"github.com/openshift/origin/pkg/template/generated/informers/internalversion/template/internalversion"
templateclient "github.com/openshift/origin/pkg/template/generated/internalclientset"
templatelister "github.com/openshift/origin/pkg/template/generated/listers/template/internalversion"
)
// TemplateInstanceFinalizerController watches for new TemplateInstance objects and
// instantiates the template contained within, using parameters read from a
// linked Secret object. The TemplateInstanceFinalizerController instantiates objects
// using its own service account, first verifying that the requester also has
// permissions to instantiate.
type TemplateInstanceFinalizerController struct {
dynamicRestMapper meta.RESTMapper
client dynamic.DynamicInterface
config *rest.Config
templateClient templateclient.Interface
lister templatelister.TemplateInstanceLister
informerSynced func() bool
queue workqueue.RateLimitingInterface
readinessLimiter workqueue.RateLimiter
clock clock.Clock
recorder record.EventRecorder
}
// NewTemplateInstanceFinalizerController returns a new TemplateInstanceFinalizerController.
func NewTemplateInstanceFinalizerController(dynamicRestMapper *discovery.DeferredDiscoveryRESTMapper, config *rest.Config, templateClient templateclient.Interface, informer internalversion.TemplateInstanceInformer) *TemplateInstanceFinalizerController {
c := &TemplateInstanceFinalizerController{
dynamicRestMapper: dynamicRestMapper,
templateClient: templateClient,
config: config,
lister: informer.Lister(),
informerSynced: informer.Informer().HasSynced,
queue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "openshift_template_instance_finalizer_controller"),
readinessLimiter: workqueue.NewItemFastSlowRateLimiter(5*time.Second, 20*time.Second, 200),
clock: clock.RealClock{},
recorder: record.NewBroadcaster().NewRecorder(legacyscheme.Scheme, v1.EventSource{Component: "template-instance-finalizer-controller"}),
}
informer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
t := obj.(*templateapi.TemplateInstance)
if t.DeletionTimestamp != nil {
c.enqueue(t)
}
},
UpdateFunc: func(_, obj interface{}) {
t := obj.(*templateapi.TemplateInstance)
if t.DeletionTimestamp != nil {
c.enqueue(t)
}
},
})
var err error
c.client, err = dynamic.NewForConfig(c.config)
if err != nil {
glog.Errorf("failure creating dynamic client: %v", err)
return nil
}
return c
}
// getTemplateInstance returns the TemplateInstance from the shared informer,
// given its key (dequeued from c.queue).
func (c *TemplateInstanceFinalizerController) getTemplateInstance(key string) (*templateapi.TemplateInstance, error) {
namespace, name, err := cache.SplitMetaNamespaceKey(key)
if err != nil {
return nil, err
}
return c.lister.TemplateInstances(namespace).Get(name)
}
// sync is the actual controller worker function.
func (c *TemplateInstanceFinalizerController) sync(key string) error {
templateInstance, err := c.getTemplateInstance(key)
if apierrors.IsNotFound(err) {
return nil
}
if err != nil {
return err
}
if templateInstance.DeletionTimestamp == nil {
return nil
}
needsFinalizing := false
for _, v := range templateInstance.Finalizers {
if v == templateapi.TemplateInstanceFinalizer {
needsFinalizing = true
break
}
}
if !needsFinalizing {
return nil
}
glog.V(4).Infof("TemplateInstanceFinalizer controller: syncing %s", key)
errs := []error{}
foreground := metav1.DeletePropagationForeground
deleteOpts := &metav1.DeleteOptions{PropagationPolicy: &foreground}
for _, o := range templateInstance.Status.Objects {
glog.V(5).Infof("attempting to delete object: %#v", o)
gv, err := schema.ParseGroupVersion(o.Ref.APIVersion)
if err != nil {
errs = append(errs, fmt.Errorf("error parsing group version %s for object %#v: %v", o.Ref.APIVersion, o, err))
continue
}
gk := schema.GroupKind{
Group: gv.Group,
Kind: o.Ref.Kind,
}
// if a resource type is removed, the template instance finalizer will
// never be able to clean up the template instance since it won't be
// able to map+delete all child resources that were previously created.
mapping, err := c.dynamicRestMapper.RESTMapping(gk, gv.Version)
if err != nil || mapping == nil {
errs = append(errs, fmt.Errorf("error mapping object %#v: %v", o, err))
continue
}
namespaced := mapping.Scope.Name() == meta.RESTScopeNameNamespace
namespace := ""
if namespaced {
namespace = o.Ref.Namespace
}
gvr := schema.GroupVersionResource{
Group: gv.Group,
Version: gv.Version,
Resource: mapping.Resource,
}
var resourceClient dynamic.DynamicResourceInterface
if namespaced {
resourceClient = c.client.NamespacedResource(gvr, namespace)
} else {
resourceClient = c.client.ClusterResource(gvr)
}
err = resourceClient.Delete(o.Ref.Name, deleteOpts)
if err != nil && !errors.IsNotFound(err) {
errs = append(errs, fmt.Errorf("error deleting object %#v with mapping %#v: %v", o, mapping, err))
continue
}
}
if len(errs) > 0 {
err = kerrs.NewAggregate(errs)
c.recorder.Eventf(templateInstance, "FinalizerError", "DeletionFailure", err.Error())
return err
}
templateInstanceCopy := templateInstance.DeepCopy()
newFinalizers := []string{}
for _, v := range templateInstanceCopy.Finalizers {
if v == templateapi.TemplateInstanceFinalizer {
continue
}
newFinalizers = append(newFinalizers, v)
}
templateInstanceCopy.Finalizers = newFinalizers
_, err = c.templateClient.Template().TemplateInstances(templateInstanceCopy.Namespace).UpdateStatus(templateInstanceCopy)
if err != nil {
utilruntime.HandleError(fmt.Errorf("TemplateInstanceFinalizer update failed: %v", err))
return err
}
return nil
}
// Run runs the controller until stopCh is closed, with as many workers as
// specified.
func (c *TemplateInstanceFinalizerController) Run(workers int, stopCh <-chan struct{}) {
defer utilruntime.HandleCrash()
defer c.queue.ShutDown()
glog.V(2).Infof("TemplateInstanceFinalizer controller waiting for cache sync")
if !cache.WaitForCacheSync(stopCh, c.informerSynced) {
return
}
glog.Infof("Starting TemplateInstanceFinalizer controller")
for i := 0; i < workers; i++ {
go wait.Until(c.runWorker, time.Second, stopCh)
}
<-stopCh
glog.V(2).Infof("Stopping TemplateInstanceFinalizer controller")
}
// runWorker repeatedly calls processNextWorkItem until the latter wants to
// exit.
func (c *TemplateInstanceFinalizerController) runWorker() {
for c.processNextWorkItem() {
}
}
// processNextWorkItem reads from the queue and calls the sync worker function.
// It returns false only when the queue is closed.
func (c *TemplateInstanceFinalizerController) processNextWorkItem() bool {
key, quit := c.queue.Get()
if quit {
return false
}
defer c.queue.Done(key)
err := c.sync(key.(string))
if err == nil { // for example, success, or the TemplateInstance has gone away
c.queue.Forget(key)
return true
}
utilruntime.HandleError(fmt.Errorf("TemplateInstanceFinalizer %v failed with: %v", key, err))
c.queue.AddRateLimited(key) // avoid hot looping
return true
}
// enqueue adds a TemplateInstance to c.queue. This function is called on the
// shared informer goroutine.
func (c *TemplateInstanceFinalizerController) enqueue(templateInstance *templateapi.TemplateInstance) {
key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(templateInstance)
if err != nil {
utilruntime.HandleError(fmt.Errorf("Couldn't get key for object %#v: %v", templateInstance, err))
return
}
c.queue.Add(key)
}