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controller.go
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controller.go
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package main
import (
"fmt"
"github.com/golang/glog"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/labels"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
informers1 "k8s.io/client-go/informers/core/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
typedcorev1 "k8s.io/client-go/kubernetes/typed/core/v1"
listers1 "k8s.io/client-go/listers/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
nvapis "nfs-controller/pkg/apis/samplecrd/v1"
clientset "nfs-controller/pkg/client/clientset/versioned"
nvScheme "nfs-controller/pkg/client/clientset/versioned/scheme"
informers "nfs-controller/pkg/client/informers/externalversions/samplecrd/v1"
listers "nfs-controller/pkg/client/listers/samplecrd/v1"
)
const controllerAgentName = "nfs-volume-controller"
type Controller struct {
kubeClientset kubernetes.Interface // 访问k8s原生资源
nfsVolClientset clientset.Interface // 访问自定义nfsVolume资源
nfsVolumeLister listers.NFSVolumeLister
nfsVolumeSynced cache.InformerSynced
pvLister listers1.PersistentVolumeLister
pvSynced cache.InformerSynced
pvcLister listers1.PersistentVolumeClaimLister
pvcSynced cache.InformerSynced
workqueue workqueue.RateLimitingInterface
recorder record.EventRecorder
}
func NewController(kubeClientSet kubernetes.Interface,
nfsVolumeClientset clientset.Interface,
nfsVolumeInformer informers.NFSVolumeInformer,
pvInformer informers1.PersistentVolumeInformer,
pvcInformer informers1.PersistentVolumeClaimInformer,
) *Controller {
utilruntime.Must(nvScheme.AddToScheme(scheme.Scheme))
glog.V(4).Info("Creating event broadcaster")
eventBroadcaster := record.NewBroadcaster()
eventBroadcaster.StartLogging(glog.Infof)
eventBroadcaster.StartRecordingToSink(&typedcorev1.EventSinkImpl{Interface: kubeClientSet.CoreV1().Events("")})
recorder := eventBroadcaster.NewRecorder(scheme.Scheme, corev1.EventSource{Component: controllerAgentName})
ctrl := &Controller{
kubeClientset: kubeClientSet,
nfsVolClientset: nfsVolumeClientset,
nfsVolumeLister: nfsVolumeInformer.Lister(),
nfsVolumeSynced: nfsVolumeInformer.Informer().HasSynced,
pvLister: pvInformer.Lister(),
pvSynced: pvInformer.Informer().HasSynced,
pvcLister: pvcInformer.Lister(),
pvcSynced: pvcInformer.Informer().HasSynced,
workqueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "NFSVolume"),
recorder: recorder,
}
// add handler
nfsVolumeInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
ctrl.enqueueNFSVolume(obj)
},
UpdateFunc: func(oldObj, newObj interface{}) {
old := oldObj.(*nvapis.NFSVolume)
new := newObj.(*nvapis.NFSVolume)
if old.ResourceVersion == new.ResourceVersion {
// Periodic resync will send update events for all known Networks.
// Two different versions of the same Network will always have different RVs.
return
}
ctrl.enqueueNFSVolume(new)
},
DeleteFunc: func(obj interface{}) {
ctrl.enqueueNFSVolumeForDelete(obj)
},
})
return ctrl
}
func (ctrl *Controller) Run(nworker int, stopCh <-chan struct{}) error {
defer utilruntime.HandleCrash()
defer ctrl.workqueue.ShutDown()
glog.Info("Starting the nfs volume control loop")
glog.Info("Waiting for caches to sync")
if ok := cache.WaitForCacheSync(stopCh, ctrl.nfsVolumeSynced); !ok {
return fmt.Errorf("failed to wait for nfs volume caches to sync")
}
if ok := cache.WaitForCacheSync(stopCh, ctrl.pvSynced); !ok {
return fmt.Errorf("failed to wait for pv caches to sync")
}
if ok := cache.WaitForCacheSync(stopCh, ctrl.pvcSynced); !ok {
return fmt.Errorf("failed to wait for pvc caches to sync")
}
glog.Info("Staring workers")
for i := 0; i < nworker; i++ {
go ctrl.runWorker()
}
glog.Info("Started workers")
return nil
}
func (ctrl *Controller) runWorker() {
for ctrl.processNext() {
}
}
func (ctrl *Controller) processNext() bool {
it, shutdown := ctrl.workqueue.Get()
if shutdown {
return false
}
err := func(obj interface{}) error {
defer ctrl.workqueue.Done(obj)
key, ok := obj.(string)
if !ok {
ctrl.workqueue.Forget(obj)
utilruntime.HandleError(fmt.Errorf("expected string in workqueue but got %#v", obj))
return nil
}
err := ctrl.handler(key)
if err != nil {
return fmt.Errorf("failed to sync '%s': %s", key, err.Error())
}
ctrl.workqueue.Forget(obj)
glog.Info("Successfully synced '%s'", key)
return nil
}(it)
if err != nil {
utilruntime.HandleError(err)
}
return true
}
func (ctrl *Controller) handler(key string) error {
ns, name, err := cache.SplitMetaNamespaceKey(key)
if err != nil {
utilruntime.HandleError(fmt.Errorf("invalid resource key: %s", key))
return err
}
nv, err := ctrl.nfsVolumeLister.NFSVolumes(ns).Get(name)
if err != nil && errors.IsNotFound(err) {
ctrl.delNFSVolume(ns, name)
} else if err != nil {
return err
}
ctrl.upsert(nv)
return nil
}
func (ctrl *Controller) upsert(nv *nvapis.NFSVolume) error {
// TODO: diff and update/create pv&pvc
return nil
}
func (ctrl *Controller) delNFSVolume(ns, name string) error {
pvAppLabel := name + "_pv"
pvcAppLabel := name + "_pvc"
// TODO: add backoff retry and handle error
pvcs, err := ctrl.pvcLister.PersistentVolumeClaims(ns).List(labels.SelectorFromSet(labels.Set{"app": pvcAppLabel}))
if err != nil {
return err
}
if len(pvcs) > 0 {
err := ctrl.kubeClientset.CoreV1().PersistentVolumeClaims(ns).Delete(pvcs[0].Name, nil)
if err != nil {
return err
}
}
pvs, err := ctrl.pvLister.List(labels.SelectorFromSet(labels.Set{"app": pvAppLabel}))
if err != nil {
return err
}
if len(pvs) > 0 {
err := ctrl.kubeClientset.CoreV1().PersistentVolumes().Delete(pvs[0].Name, nil)
if err != nil {
return err
}
}
return nil
}
func (ctrl *Controller) enqueueNFSVolume(obj interface{}) {
key, err := cache.MetaNamespaceKeyFunc(obj)
if err != nil {
utilruntime.HandleError(err)
return
}
ctrl.workqueue.AddRateLimited(key)
}
func (ctrl *Controller) enqueueNFSVolumeForDelete(obj interface{}) {
key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj)
if err != nil {
utilruntime.HandleError(err)
return
}
ctrl.workqueue.AddRateLimited(key)
}