mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-25 06:20:24 +00:00
118 lines
2.9 KiB
Go
118 lines
2.9 KiB
Go
/*
|
|
Copyright 2017 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 watch
|
|
|
|
import (
|
|
"sync"
|
|
"sync/atomic"
|
|
|
|
"k8s.io/apimachinery/pkg/runtime"
|
|
"k8s.io/apimachinery/pkg/watch"
|
|
"k8s.io/client-go/tools/cache"
|
|
)
|
|
|
|
func newTicketer() *ticketer {
|
|
return &ticketer{
|
|
cond: sync.NewCond(&sync.Mutex{}),
|
|
}
|
|
}
|
|
|
|
type ticketer struct {
|
|
counter uint64
|
|
|
|
cond *sync.Cond
|
|
current uint64
|
|
}
|
|
|
|
func (t *ticketer) GetTicket() uint64 {
|
|
// -1 to start from 0
|
|
return atomic.AddUint64(&t.counter, 1) - 1
|
|
}
|
|
|
|
func (t *ticketer) WaitForTicket(ticket uint64, f func()) {
|
|
t.cond.L.Lock()
|
|
defer t.cond.L.Unlock()
|
|
for ticket != t.current {
|
|
t.cond.Wait()
|
|
}
|
|
|
|
f()
|
|
|
|
t.current++
|
|
t.cond.Broadcast()
|
|
}
|
|
|
|
// NewIndexerInformerWatcher will create an IndexerInformer and wrap it into watch.Interface
|
|
// so you can use it anywhere where you'd have used a regular Watcher returned from Watch method.
|
|
// it also returns a channel you can use to wait for the informers to fully shutdown.
|
|
func NewIndexerInformerWatcher(lw cache.ListerWatcher, objType runtime.Object) (cache.Indexer, cache.Controller, watch.Interface, <-chan struct{}) {
|
|
ch := make(chan watch.Event)
|
|
doneCh := make(chan struct{})
|
|
w := watch.NewProxyWatcher(ch)
|
|
t := newTicketer()
|
|
|
|
indexer, informer := cache.NewIndexerInformer(lw, objType, 0, cache.ResourceEventHandlerFuncs{
|
|
AddFunc: func(obj interface{}) {
|
|
go t.WaitForTicket(t.GetTicket(), func() {
|
|
select {
|
|
case ch <- watch.Event{
|
|
Type: watch.Added,
|
|
Object: obj.(runtime.Object),
|
|
}:
|
|
case <-w.StopChan():
|
|
}
|
|
})
|
|
},
|
|
UpdateFunc: func(old, new interface{}) {
|
|
go t.WaitForTicket(t.GetTicket(), func() {
|
|
select {
|
|
case ch <- watch.Event{
|
|
Type: watch.Modified,
|
|
Object: new.(runtime.Object),
|
|
}:
|
|
case <-w.StopChan():
|
|
}
|
|
})
|
|
},
|
|
DeleteFunc: func(obj interface{}) {
|
|
go t.WaitForTicket(t.GetTicket(), func() {
|
|
staleObj, stale := obj.(cache.DeletedFinalStateUnknown)
|
|
if stale {
|
|
// We have no means of passing the additional information down using watch API based on watch.Event
|
|
// but the caller can filter such objects by checking if metadata.deletionTimestamp is set
|
|
obj = staleObj
|
|
}
|
|
|
|
select {
|
|
case ch <- watch.Event{
|
|
Type: watch.Deleted,
|
|
Object: obj.(runtime.Object),
|
|
}:
|
|
case <-w.StopChan():
|
|
}
|
|
})
|
|
},
|
|
}, cache.Indexers{})
|
|
|
|
go func() {
|
|
defer close(doneCh)
|
|
informer.Run(w.StopChan())
|
|
}()
|
|
|
|
return indexer, informer, w, doneCh
|
|
}
|