Merge pull request #61976 from atlassian/ticker-with-stop

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Stop() for Ticker to enable leak-free code

**What this PR does / why we need it**:
I wanted to use the clock package but the `Ticker` without a `Stop()` method is a deal breaker for me.

**Release note**:
```release-note
NONE
```
/kind enhancement
/sig api-machinery

Kubernetes-commit: d42df4561a6c754120e9b46b37c032a57ca92a9a

Godeps/Godeps.json

@@ -252,319 +252,319 @@
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 		{
 			"ImportPath": "k8s.io/apimachinery/pkg/version",
-			"Rev": "dd7876c087d16d10b82489a4dac9e3f4427176ca"
+			"Rev": "13b73596e4b63e03203e86f6d9c7bcc1b937c62f"
 		},
 		{
 			"ImportPath": "k8s.io/apimachinery/pkg/watch",
-			"Rev": "dd7876c087d16d10b82489a4dac9e3f4427176ca"
+			"Rev": "13b73596e4b63e03203e86f6d9c7bcc1b937c62f"
 		},
 		{
 			"ImportPath": "k8s.io/apimachinery/third_party/forked/golang/json",
-			"Rev": "dd7876c087d16d10b82489a4dac9e3f4427176ca"
+			"Rev": "13b73596e4b63e03203e86f6d9c7bcc1b937c62f"
 		},
 		{
 			"ImportPath": "k8s.io/apimachinery/third_party/forked/golang/netutil",
-			"Rev": "dd7876c087d16d10b82489a4dac9e3f4427176ca"
+			"Rev": "13b73596e4b63e03203e86f6d9c7bcc1b937c62f"
 		},
 		{
 			"ImportPath": "k8s.io/apimachinery/third_party/forked/golang/reflect",
-			"Rev": "dd7876c087d16d10b82489a4dac9e3f4427176ca"
+			"Rev": "13b73596e4b63e03203e86f6d9c7bcc1b937c62f"
 		},
 		{
 			"ImportPath": "k8s.io/kube-openapi/pkg/util/proto",

util/workqueue/delaying_queue.go

@@ -45,7 +45,7 @@ func newDelayingQueue(clock clock.Clock, name string) DelayingInterface {
 	ret := &delayingType{
 		Interface:       NewNamed(name),
 		clock:           clock,
-		heartbeat:       clock.Tick(maxWait),
+		heartbeat:       clock.NewTicker(maxWait),
 		stopCh:          make(chan struct{}),
 		waitingForAddCh: make(chan *waitFor, 1000),
 		metrics:         newRetryMetrics(name),
@@ -67,10 +67,7 @@ type delayingType struct {
 	stopCh chan struct{}
 
 	// heartbeat ensures we wait no more than maxWait before firing
-	//
+	heartbeat clock.Ticker
-	// TODO: replace with Ticker (and add to clock) so this can be cleaned up.
-	// clock.Tick will leak.
-	heartbeat <-chan time.Time
 
 	// waitingForAddCh is a buffered channel that feeds waitingForAdd
 	waitingForAddCh chan *waitFor
@@ -138,6 +135,7 @@ func (pq waitForPriorityQueue) Peek() interface{} {
 func (q *delayingType) ShutDown() {
 	q.Interface.ShutDown()
 	close(q.stopCh)
+	q.heartbeat.Stop()
 }
 
 // AddAfter adds the given item to the work queue after the given delay
@@ -209,7 +207,7 @@ func (q *delayingType) waitingLoop() {
 		case <-q.stopCh:
 			return
 
-		case <-q.heartbeat:
+		case <-q.heartbeat.C():
 			// continue the loop, which will add ready items
 
 		case <-nextReadyAt:

util/workqueue/rate_limitting_queue_test.go

@@ -30,7 +30,7 @@ func TestRateLimitingQueue(t *testing.T) {
 	delayingQueue := &delayingType{
 		Interface:       New(),
 		clock:           fakeClock,
-		heartbeat:       fakeClock.Tick(maxWait),
+		heartbeat:       fakeClock.NewTicker(maxWait),
 		stopCh:          make(chan struct{}),
 		waitingForAddCh: make(chan *waitFor, 1000),
 		metrics:         newRetryMetrics(""),