// 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 := 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.Storage.Watch(key, version, filterFunc)
}
return e.Storage.WatchList(e.KeyRootFunc(ctx), version, filterFunc)
}
// WatchServices begins watching for new, changed, or deleted service configurations.
func (r *Registry) WatchServices(ctx api.Context, label labels.Selector, field fields.Selector, resourceVersion string) (watch.Interface, error) {
version, err := storage.ParseWatchResourceVersion(resourceVersion, "service")
if err != nil {
return nil, err
}
if !label.Empty() {
return nil, fmt.Errorf("label selectors are not supported on services")
}
if value, found := field.RequiresExactMatch("name"); found {
key, err := makeServiceKey(ctx, value)
if err != nil {
return nil, err
}
// TODO: use generic.SelectionPredicate
return r.Watch(key, version, storage.Everything)
}
if field.Empty() {
return r.WatchList(makeServiceListKey(ctx), version, storage.Everything)
}
return nil, fmt.Errorf("only the 'name' and default (everything) field selectors are supported")
}
// WatchRoutes begins watching for new, changed, or deleted route configurations.
func (registry *Etcd) WatchRoutes(ctx kapi.Context, label labels.Selector, field fields.Selector, resourceVersion string) (watch.Interface, error) {
if !label.Empty() {
return nil, fmt.Errorf("label selectors are not supported on routes yet")
}
version, err := storage.ParseWatchResourceVersion(resourceVersion, "pod")
if err != nil {
return nil, err
}
if value, found := field.RequiresExactMatch("ID"); found {
key, err := makeRouteKey(ctx, value)
if err != nil {
return nil, err
}
return registry.Watch(key, version, storage.Everything)
}
if field.Empty() {
key := kubeetcd.MakeEtcdListKey(ctx, RoutePath)
return registry.WatchList(key, version, storage.Everything)
}
return nil, fmt.Errorf("only the 'ID' and default (everything) field selectors are supported")
}
