Golang watch.Interface类代码示例

func testCheckEventType(t *testing.T, expectEventType watch.EventType, w watch.Interface) {
	select {
	case res := <-w.ResultChan():
		if res.Type != expectEventType {
			t.Errorf("event type want=%v, get=%v", expectEventType, res.Type)
		}
	case <-time.After(wait.ForeverTestTimeout):
		t.Errorf("time out after waiting %v on ResultChan", wait.ForeverTestTimeout)
	}
}

func observeCreation(w watch.Interface) {
	select {
	case event, _ := <-w.ResultChan():
		if event.Type != watch.Added {
			framework.Failf("Failed to observe the creation: %v", event)
		}
	case <-time.After(30 * time.Second):
		framework.Failf("Timeout while waiting for observing the creation")
	}
}

func waitForAnyPersistentVolumeClaimPhase(w watch.Interface, phase v1.PersistentVolumeClaimPhase) {
	for {
		event := <-w.ResultChan()
		claim, ok := event.Object.(*v1.PersistentVolumeClaim)
		if !ok {
			continue
		}
		if claim.Status.Phase == phase {
			glog.V(2).Infof("claim %q is %s", claim.Name, phase)
			break
		}
	}
}

func waitForAnyPersistentVolumePhase(w watch.Interface, phase v1.PersistentVolumePhase) {
	for {
		event := <-w.ResultChan()
		volume, ok := event.Object.(*v1.PersistentVolume)
		if !ok {
			continue
		}
		if volume.Status.Phase == phase {
			glog.V(2).Infof("volume %q is %s", volume.Name, phase)
			break
		}
	}
}

func testCheckResult(t *testing.T, i int, expectEventType watch.EventType, w watch.Interface, expectObj *api.Pod) {
	select {
	case res := <-w.ResultChan():
		if res.Type != expectEventType {
			t.Errorf("#%d: event type want=%v, get=%v", i, expectEventType, res.Type)
			return
		}
		if !reflect.DeepEqual(expectObj, res.Object) {
			t.Errorf("#%d: obj want=\n%#v\nget=\n%#v", i, expectObj, res.Object)
		}
	case <-time.After(wait.ForeverTestTimeout):
		t.Errorf("#%d: time out after waiting %v on ResultChan", i, wait.ForeverTestTimeout)
	}
}

func testCheckStop(t *testing.T, i int, w watch.Interface) {
	select {
	case e, ok := <-w.ResultChan():
		if ok {
			var obj string
			switch e.Object.(type) {
			case *api.Pod:
				obj = e.Object.(*api.Pod).Name
			case *metav1.Status:
				obj = e.Object.(*metav1.Status).Message
			}
			t.Errorf("#%d: ResultChan should have been closed. Event: %s. Object: %s", i, e.Type, obj)
		}
	case <-time.After(wait.ForeverTestTimeout):
		t.Errorf("#%d: time out after waiting 1s on ResultChan", i)
	}
}

func verifyWatchEvent(t *testing.T, w watch.Interface, eventType watch.EventType, eventObject runtime.Object) {
	_, _, line, _ := goruntime.Caller(1)
	select {
	case event := <-w.ResultChan():
		if e, a := eventType, event.Type; e != a {
			t.Logf("(called from line %d)", line)
			t.Errorf("Expected: %s, got: %s", eventType, event.Type)
		}
		if e, a := eventObject, event.Object; !api.Semantic.DeepDerivative(e, a) {
			t.Logf("(called from line %d)", line)
			t.Errorf("Expected (%s): %#v, got: %#v", eventType, e, a)
		}
	case <-time.After(wait.ForeverTestTimeout):
		t.Logf("(called from line %d)", line)
		t.Errorf("Timed out waiting for an event")
	}
}

func observeObjectDeletion(w watch.Interface) (obj runtime.Object) {
	deleted := false
	timeout := false
	timer := time.After(60 * time.Second)
	for !deleted && !timeout {
		select {
		case event, _ := <-w.ResultChan():
			if event.Type == watch.Deleted {
				obj = event.Object
				deleted = true
			}
		case <-timer:
			timeout = true
		}
	}
	if !deleted {
		framework.Failf("Failed to observe pod deletion")
	}
	return
}

func waitForPersistentVolumeClaimPhase(client *clientset.Clientset, claimName, namespace string, w watch.Interface, phase v1.PersistentVolumeClaimPhase) {
	// Check if the claim is already in requested phase
	claim, err := client.Core().PersistentVolumeClaims(namespace).Get(claimName, metav1.GetOptions{})
	if err == nil && claim.Status.Phase == phase {
		return
	}

	// Wait for the phase
	for {
		event := <-w.ResultChan()
		claim, ok := event.Object.(*v1.PersistentVolumeClaim)
		if !ok {
			continue
		}
		if claim.Status.Phase == phase && claim.Name == claimName {
			glog.V(2).Infof("claim %q is %s", claim.Name, phase)
			break
		}
	}
}

func waitForPersistentVolumePhase(client *clientset.Clientset, pvName string, w watch.Interface, phase v1.PersistentVolumePhase) {
	// Check if the volume is already in requested phase
	volume, err := client.Core().PersistentVolumes().Get(pvName, metav1.GetOptions{})
	if err == nil && volume.Status.Phase == phase {
		return
	}

	// Wait for the phase
	for {
		event := <-w.ResultChan()
		volume, ok := event.Object.(*v1.PersistentVolume)
		if !ok {
			continue
		}
		if volume.Status.Phase == phase && volume.Name == pvName {
			glog.V(2).Infof("volume %q is %s", volume.Name, phase)
			break
		}
	}
}

// ensure the watch delivers the requested and only the requested items.
func consume(t *testing.T, w watch.Interface, rvs []string, done *sync.WaitGroup) {
	defer done.Done()
	for _, rv := range rvs {
		got, ok := <-w.ResultChan()
		if !ok {
			t.Errorf("%#v: unexpected channel close, wanted %v", rvs, rv)
			return
		}
		gotRV := got.Object.(*v1.Pod).ObjectMeta.ResourceVersion
		if e, a := rv, gotRV; e != a {
			t.Errorf("wanted %v, got %v", e, a)
		} else {
			t.Logf("Got %v as expected", gotRV)
		}
	}
	// We should not get anything else.
	got, open := <-w.ResultChan()
	if open {
		t.Errorf("%#v: unwanted object %#v", rvs, got)
	}
}

// watchRollbackEvent watches for rollback events and returns rollback result
func watchRollbackEvent(w watch.Interface) string {
	signals := make(chan os.Signal, 1)
	signal.Notify(signals, os.Interrupt, os.Kill, syscall.SIGTERM)
	for {
		select {
		case event, ok := <-w.ResultChan():
			if !ok {
				return ""
			}
			obj, ok := event.Object.(*api.Event)
			if !ok {
				w.Stop()
				return ""
			}
			isRollback, result := isRollbackEvent(obj)
			if isRollback {
				w.Stop()
				return result
			}
		case <-signals:
			w.Stop()
		}
	}
}

// watchHandler watches w and keeps *resourceVersion up to date.
func (r *Reflector) watchHandler(w watch.Interface, resourceVersion *string, errc chan error, stopCh <-chan struct{}) error {
	start := time.Now()
	eventCount := 0

	// Stopping the watcher should be idempotent and if we return from this function there's no way
	// we're coming back in with the same watch interface.
	defer w.Stop()

loop:
	for {
		select {
		case <-stopCh:
			return errorStopRequested
		case err := <-errc:
			return err
		case event, ok := <-w.ResultChan():
			if !ok {
				break loop
			}
			if event.Type == watch.Error {
				return apierrs.FromObject(event.Object)
			}
			if e, a := r.expectedType, reflect.TypeOf(event.Object); e != nil && e != a {
				utilruntime.HandleError(fmt.Errorf("%s: expected type %v, but watch event object had type %v", r.name, e, a))
				continue
			}
			meta, err := meta.Accessor(event.Object)
			if err != nil {
				utilruntime.HandleError(fmt.Errorf("%s: unable to understand watch event %#v", r.name, event))
				continue
			}
			newResourceVersion := meta.GetResourceVersion()
			switch event.Type {
			case watch.Added:
				err := r.store.Add(event.Object)
				if err != nil {
					utilruntime.HandleError(fmt.Errorf("%s: unable to add watch event object (%#v) to store: %v", r.name, event.Object, err))
				}
			case watch.Modified:
				err := r.store.Update(event.Object)
				if err != nil {
					utilruntime.HandleError(fmt.Errorf("%s: unable to update watch event object (%#v) to store: %v", r.name, event.Object, err))
				}
			case watch.Deleted:
				// TODO: Will any consumers need access to the "last known
				// state", which is passed in event.Object? If so, may need
				// to change this.
				err := r.store.Delete(event.Object)
				if err != nil {
					utilruntime.HandleError(fmt.Errorf("%s: unable to delete watch event object (%#v) from store: %v", r.name, event.Object, err))
				}
			default:
				utilruntime.HandleError(fmt.Errorf("%s: unable to understand watch event %#v", r.name, event))
			}
			*resourceVersion = newResourceVersion
			r.setLastSyncResourceVersion(newResourceVersion)
			eventCount++
		}
	}

	watchDuration := time.Now().Sub(start)
	if watchDuration < 1*time.Second && eventCount == 0 {
		glog.V(4).Infof("%s: Unexpected watch close - watch lasted less than a second and no items received", r.name)
		return errors.New("very short watch")
	}
	glog.V(4).Infof("%s: Watch close - %v total %v items received", r.name, r.expectedType, eventCount)
	return nil
}