// WatchPredicate starts a watch for the items that m matches. func (e *Etcd) WatchPredicate(ctx api.Context, m generic.Matcher, resourceVersion string) (watch.Interface, error) { version, err := tools.ParseWatchResourceVersion(resourceVersion, e.EndpointName) if err != nil { return nil, err } filterFunc := func(obj runtime.Object) bool { matches, err := m.Matches(obj) if err != nil { glog.Errorf("unable to match watch: %v", err) return false } if matches && e.Decorator != nil { if err := e.Decorator(obj); err != nil { glog.Errorf("unable to decorate watch: %v", err) return false } } return matches } if name, ok := m.MatchesSingle(); ok { key, err := e.KeyFunc(ctx, name) if err != nil { return nil, err } return e.Helper.Watch(key, version, filterFunc) } return e.Helper.WatchList(e.KeyRootFunc(ctx), version, filterFunc) }