kubernetes decorated_watcher 源码
kubernetes decorated_watcher 代码
文件路径：/staging/src/k8s.io/apiserver/pkg/registry/generic/registry/decorated_watcher.go
/*
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"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/watch"
)
type decoratedWatcher struct {
w watch.Interface
decorator func(runtime.Object)
cancel context.CancelFunc
resultCh chan watch.Event
}
func newDecoratedWatcher(ctx context.Context, w watch.Interface, decorator func(runtime.Object)) *decoratedWatcher {
ctx, cancel := context.WithCancel(ctx)
d := &decoratedWatcher{
w: w,
decorator: decorator,
cancel: cancel,
resultCh: make(chan watch.Event),
}
go d.run(ctx)
return d
}
// run decorates watch events from the underlying watcher until its result channel
// is closed or the passed in context is done.
// When run() returns, decoratedWatcher#resultCh is closed.
func (d *decoratedWatcher) run(ctx context.Context) {
var recv, send watch.Event
var ok bool
defer close(d.resultCh)
for {
select {
case recv, ok = <-d.w.ResultChan():
if !ok {
// The underlying channel was closed, cancel our context
d.cancel()
return
}
switch recv.Type {
case watch.Added, watch.Modified, watch.Deleted, watch.Bookmark:
d.decorator(recv.Object)
send = recv
case watch.Error:
send = recv
}
select {
case d.resultCh <- send:
// propagated event successfully
case <-ctx.Done():
// context timed out or was cancelled, stop the underlying watcher
d.w.Stop()
return
}
case <-ctx.Done():
// context timed out or was cancelled, stop the underlying watcher
d.w.Stop()
return
}
}
}
func (d *decoratedWatcher) Stop() {
// stop the underlying watcher
d.w.Stop()
// cancel our context
d.cancel()
}
func (d *decoratedWatcher) ResultChan() <-chan watch.Event {
return d.resultCh
}
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