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DelayingQueue.ShutDown() should be reentrant

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All queue ShutDown() calls should be able to be invoked multiple times.

```
Observed a panic: "close of closed channel" (close of closed channel)
/go/src/github.com/openshift/cluster-version-operator/vendor/k8s.io/apimachinery/pkg/util/runtime/runtime.go:76
/go/src/github.com/openshift/cluster-version-operator/vendor/k8s.io/apimachinery/pkg/util/runtime/runtime.go:65
/go/src/github.com/openshift/cluster-version-operator/vendor/k8s.io/apimachinery/pkg/util/runtime/runtime.go:51
/usr/local/go/src/runtime/asm_amd64.s:573
/usr/local/go/src/runtime/panic.go:502
/usr/local/go/src/runtime/chan.go:333
/go/src/github.com/openshift/cluster-version-operator/vendor/k8s.io/client-go/util/workqueue/delaying_queue.go:137
```

Use sync.Once to guarantee a single close.
This commit is contained in:
Clayton Coleman 2019-04-27 16:16:55 -04:00
parent c88b7cdd58
commit d2f7eb5235
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1 changed files with 10 additions and 4 deletions
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14
staging/src/k8s.io/client-go/util/workqueue/delaying_queue.go
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@ -18,6 +18,7 @@ package workqueue
import (
"container/heap"
"sync"
"time"
"k8s.io/apimachinery/pkg/util/clock"
@ -66,6 +67,8 @@ type delayingType struct {
// stopCh lets us signal a shutdown to the waiting loop
stopCh chan struct{}
// stopOnce guarantees we only signal shutdown a single time
stopOnce sync.Once
// heartbeat ensures we wait no more than maxWait before firing
heartbeat clock.Ticker
@ -133,11 +136,14 @@ func (pq waitForPriorityQueue) Peek() interface{} {
return pq[0]
}
// ShutDown gives a way to shut off this queue
// ShutDown stops the queue. After the queue drains, the returned shutdown bool
// on Get() will be true. This method may be invoked more than once.
func (q *delayingType) ShutDown() {
q.Interface.ShutDown()
close(q.stopCh)
q.heartbeat.Stop()
q.stopOnce.Do(func() {
q.Interface.ShutDown()
close(q.stopCh)
q.heartbeat.Stop()
})
}
// AddAfter adds the given item to the work queue after the given delay