Example #1
0
// 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)
}
Example #2
0
// ListPredicate returns a list of all the items matching m.
func (e *Etcd) ListPredicate(ctx api.Context, m generic.Matcher) (runtime.Object, error) {
	list := e.NewListFunc()
	trace := util.NewTrace("List " + reflect.TypeOf(list).String())
	defer trace.LogIfLong(600 * time.Millisecond)
	if name, ok := m.MatchesSingle(); ok {
		trace.Step("About to read single object")
		key, err := e.KeyFunc(ctx, name)
		if err != nil {
			return nil, err
		}
		err = e.Helper.ExtractObjToList(key, list)
		trace.Step("Object extracted")
		if err != nil {
			return nil, err
		}
	} else {
		trace.Step("About to list directory")
		err := e.Helper.ExtractToList(e.KeyRootFunc(ctx), list)
		trace.Step("List extracted")
		if err != nil {
			return nil, err
		}
	}
	defer trace.Step("List filtered")
	return generic.FilterList(list, m, generic.DecoratorFunc(e.Decorator))
}