// 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())
filterFunc := e.filterAndDecorateFunction(m)
defer trace.LogIfLong(600 * time.Millisecond)
if name, ok := m.MatchesSingle(); ok {
if key, err := e.KeyFunc(ctx, name); err == nil {
trace.Step("About to read single object")
err := e.Storage.GetToList(key, filterFunc, list)
trace.Step("Object extracted")
if err != nil {
return nil, err
}
return list, nil
}
// if we cannot extract a key based on the current context, the optimization is skipped
}
trace.Step("About to list directory")
err := e.Storage.List(e.KeyRootFunc(ctx), filterFunc, list)
trace.Step("List extracted")
if err != nil {
return nil, err
}
return list, nil
}
func (e *Etcd) filterAndDecorateFunction(m generic.Matcher) func(runtime.Object) bool {
return 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
}
}
// 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 := storage.ParseWatchResourceVersion(resourceVersion, e.EndpointName)
if err != nil {
return nil, err
}
filterFunc := e.filterAndDecorateFunction(m)
if name, ok := m.MatchesSingle(); ok {
if key, err := e.KeyFunc(ctx, name); err == nil {
if err != nil {
return nil, err
}
return e.Storage.Watch(key, version, filterFunc)
}
// if we cannot extract a key based on the current context, the optimization is skipped
}
return e.Storage.WatchList(e.KeyRootFunc(ctx), version, filterFunc)
}