| /* |
| Copyright 2016 The Kubernetes Authors. |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| */ |
| |
| package registry |
| |
| import ( |
| "context" |
| "net/http" |
| |
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" |
| "k8s.io/apimachinery/pkg/watch" |
| ) |
| |
| type decoratedWatcher struct { |
| w watch.Interface |
| decorator ObjectFunc |
| cancel context.CancelFunc |
| resultCh chan watch.Event |
| } |
| |
| func newDecoratedWatcher(w watch.Interface, decorator ObjectFunc) *decoratedWatcher { |
| ctx, cancel := context.WithCancel(context.Background()) |
| d := &decoratedWatcher{ |
| w: w, |
| decorator: decorator, |
| cancel: cancel, |
| resultCh: make(chan watch.Event), |
| } |
| go d.run(ctx) |
| return d |
| } |
| |
| func (d *decoratedWatcher) run(ctx context.Context) { |
| var recv, send watch.Event |
| var ok bool |
| for { |
| select { |
| case recv, ok = <-d.w.ResultChan(): |
| // The underlying channel may be closed after timeout. |
| if !ok { |
| d.cancel() |
| return |
| } |
| switch recv.Type { |
| case watch.Added, watch.Modified, watch.Deleted, watch.Bookmark: |
| err := d.decorator(recv.Object) |
| if err != nil { |
| send = makeStatusErrorEvent(err) |
| break |
| } |
| send = recv |
| case watch.Error: |
| send = recv |
| } |
| select { |
| case d.resultCh <- send: |
| if send.Type == watch.Error { |
| d.cancel() |
| } |
| case <-ctx.Done(): |
| } |
| case <-ctx.Done(): |
| d.w.Stop() |
| close(d.resultCh) |
| return |
| } |
| } |
| } |
| |
| func (d *decoratedWatcher) Stop() { |
| d.cancel() |
| } |
| |
| func (d *decoratedWatcher) ResultChan() <-chan watch.Event { |
| return d.resultCh |
| } |
| |
| func makeStatusErrorEvent(err error) watch.Event { |
| status := &metav1.Status{ |
| Status: metav1.StatusFailure, |
| Message: err.Error(), |
| Code: http.StatusInternalServerError, |
| Reason: metav1.StatusReasonInternalError, |
| } |
| return watch.Event{ |
| Type: watch.Error, |
| Object: status, |
| } |
| } |