// 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 {
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:
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:
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
}
// GetReference returns an ObjectReference which refers to the given
// object, or an error if the object doesn't follow the conventions
// that would allow this.
// TODO: should take a meta.Interface see http://issue.k8s.io/7127
func GetReference(obj runtime.Object) (*ObjectReference, error) {
if obj == nil {
return nil, ErrNilObject
}
if ref, ok := obj.(*ObjectReference); ok {
// Don't make a reference to a reference.
return ref, nil
}
meta, err := meta.Accessor(obj)
if err != nil {
return nil, err
}
gvk := obj.GetObjectKind().GroupVersionKind()
// if the object referenced is actually persisted, we can just get kind from meta
// if we are building an object reference to something not yet persisted, we should fallback to scheme
var kind string
if gvk != nil {
kind = gvk.Kind
}
if len(kind) == 0 {
// TODO: this is wrong
gvk, err := Scheme.ObjectKind(obj)
if err != nil {
return nil, err
}
kind = gvk.Kind
}
// if the object referenced is actually persisted, we can also get version from meta
var version string
if gvk != nil {
version = gvk.GroupVersion().String()
}
if len(version) == 0 {
selfLink := meta.GetSelfLink()
if len(selfLink) == 0 {
return nil, ErrNoSelfLink
}
selfLinkUrl, err := url.Parse(selfLink)
if err != nil {
return nil, err
}
// example paths: /<prefix>/<version>/*
parts := strings.Split(selfLinkUrl.Path, "/")
if len(parts) < 3 {
return nil, fmt.Errorf("unexpected self link format: '%v'; got version '%v'", selfLink, version)
}
version = parts[2]
}
return &ObjectReference{
Kind: kind,
APIVersion: version,
Name: meta.GetName(),
Namespace: meta.GetNamespace(),
UID: meta.GetUID(),
ResourceVersion: meta.GetResourceVersion(),
}, nil
}
