// watchHandler watches w and keeps *resourceVersion up to date.
func (r *Reflector) watchHandler(w watch.Interface, resourceVersion *string, resyncCh <-chan time.Time, 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 <-resyncCh:
return errorResyncRequested
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 {
util.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 {
util.HandleError(fmt.Errorf("%s: unable to understand watch event %#v", r.name, event))
continue
}
newResourceVersion := meta.ResourceVersion()
switch event.Type {
case watch.Added:
r.store.Add(event.Object)
case watch.Modified:
r.store.Update(event.Object)
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.
r.store.Delete(event.Object)
default:
util.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
}
func waitForPersistentVolumePhase(w watch.Interface, phase api.PersistentVolumePhase) {
for {
event := <-w.ResultChan()
volume := event.Object.(*api.PersistentVolume)
if volume.Status.Phase == phase {
break
}
}
}
// WatchLoop loops, passing events in w to fn.
// If user sends interrupt signal, shut down cleanly. Otherwise, never return.
func WatchLoop(w watch.Interface, fn func(watch.Event) error) {
signals := make(chan os.Signal, 1)
signal.Notify(signals, os.Interrupt)
defer signal.Stop(signals)
for {
select {
case event, ok := <-w.ResultChan():
if !ok {
return
}
if err := fn(event); err != nil {
w.Stop()
}
case <-signals:
w.Stop()
}
}
}
// 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.(*api.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)
}
}