add object type to cacheWatcher

staging/src/k8s.io/apiserver/pkg/storage/cacher/cacher.go

@@ -443,7 +443,7 @@ func (c *Cacher) Watch(ctx context.Context, key string, resourceVersion string,
 	// given that memory allocation may trigger GC and block the thread.
 	// Also note that emptyFunc is a placeholder, until we will be able
 	// to compute watcher.forget function (which has to happen under lock).
-	watcher := newCacheWatcher(chanSize, filterWithAttrsFunction(key, pred), emptyFunc, c.versioner, deadline, pred.AllowWatchBookmarks)
+	watcher := newCacheWatcher(chanSize, filterWithAttrsFunction(key, pred), emptyFunc, c.versioner, deadline, pred.AllowWatchBookmarks, c.objectType)
 
 	// We explicitly use thread unsafe version and do locking ourself to ensure that
 	// no new events will be processed in the meantime. The watchCache will be unlocked
@@ -1033,9 +1033,11 @@ type cacheWatcher struct {
 	// save it here to send bookmark events before that.
 	deadline            time.Time
 	allowWatchBookmarks bool
+	// Object type of the cache watcher interests
+	objectType reflect.Type
 }
 
-func newCacheWatcher(chanSize int, filter filterWithAttrsFunc, forget func(), versioner storage.Versioner, deadline time.Time, allowWatchBookmarks bool) *cacheWatcher {
+func newCacheWatcher(chanSize int, filter filterWithAttrsFunc, forget func(), versioner storage.Versioner, deadline time.Time, allowWatchBookmarks bool, objectType reflect.Type) *cacheWatcher {
 	return &cacheWatcher{
 		input:               make(chan *watchCacheEvent, chanSize),
 		result:              make(chan watch.Event, chanSize),
@@ -1046,6 +1048,7 @@ func newCacheWatcher(chanSize int, filter filterWithAttrsFunc, forget func(), ve
 		versioner:           versioner,
 		deadline:            deadline,
 		allowWatchBookmarks: allowWatchBookmarks,
+		objectType:          objectType,
 	}
 }
 
@@ -1208,16 +1211,12 @@ func (c *cacheWatcher) process(ctx context.Context, initEvents []*watchCacheEven
 	for _, event := range initEvents {
 		c.sendWatchCacheEvent(event)
 	}
+	objType := c.objectType.String()
 	if len(initEvents) > 0 {
-		objType := reflect.TypeOf(initEvents[0].Object).String()
 		initCounter.WithLabelValues(objType).Add(float64(len(initEvents)))
 	}
 	processingTime := time.Since(startTime)
 	if processingTime > initProcessThreshold {
-		objType := "<null>"
-		if len(initEvents) > 0 {
-			objType = reflect.TypeOf(initEvents[0].Object).String()
-		}
 		klog.V(2).Infof("processing %d initEvents of %s took %v", len(initEvents), objType, processingTime)
 	}
 

staging/src/k8s.io/apiserver/pkg/storage/cacher/cacher_whitebox_test.go

@@ -45,6 +45,10 @@ import (
 	utilfeaturetesting "k8s.io/apiserver/pkg/util/feature/testing"
 )
 
+var (
+	objectType = reflect.TypeOf(&v1.Pod{})
+)
+
 // verifies the cacheWatcher.process goroutine is properly cleaned up even if
 // the writes to cacheWatcher.result channel is blocked.
 func TestCacheWatcherCleanupNotBlockedByResult(t *testing.T) {
@@ -67,7 +71,7 @@ func TestCacheWatcherCleanupNotBlockedByResult(t *testing.T) {
 	}
 	// set the size of the buffer of w.result to 0, so that the writes to
 	// w.result is blocked.
-	w = newCacheWatcher(0, filter, forget, testVersioner{}, time.Now(), false)
+	w = newCacheWatcher(0, filter, forget, testVersioner{}, time.Now(), false, objectType)
 	go w.process(context.Background(), initEvents, 0)
 	w.Stop()
 	if err := wait.PollImmediate(1*time.Second, 5*time.Second, func() (bool, error) {
@@ -187,7 +191,7 @@ TestCase:
 			testCase.events[j].ResourceVersion = uint64(j) + 1
 		}
 
-		w := newCacheWatcher(0, filter, forget, testVersioner{}, time.Now(), false)
+		w := newCacheWatcher(0, filter, forget, testVersioner{}, time.Now(), false, objectType)
 		go w.process(context.Background(), testCase.events, 0)
 
 		ch := w.ResultChan()
@@ -466,7 +470,7 @@ func TestCacheWatcherStoppedInAnotherGoroutine(t *testing.T) {
 	// timeout to zero and run the Stop goroutine concurrently.
 	// May sure that the watch will not be blocked on Stop.
 	for i := 0; i < maxRetriesToProduceTheRaceCondition; i++ {
-		w = newCacheWatcher(0, filter, forget, testVersioner{}, time.Now(), false)
+		w = newCacheWatcher(0, filter, forget, testVersioner{}, time.Now(), false, objectType)
 		go w.Stop()
 		select {
 		case <-done:
@@ -478,7 +482,7 @@ func TestCacheWatcherStoppedInAnotherGoroutine(t *testing.T) {
 	deadline := time.Now().Add(time.Hour)
 	// After that, verifies the cacheWatcher.process goroutine works correctly.
 	for i := 0; i < maxRetriesToProduceTheRaceCondition; i++ {
-		w = newCacheWatcher(2, filter, emptyFunc, testVersioner{}, deadline, false)
+		w = newCacheWatcher(2, filter, emptyFunc, testVersioner{}, deadline, false, objectType)
 		w.input <- &watchCacheEvent{Object: &v1.Pod{}, ResourceVersion: uint64(i + 1)}
 		ctx, _ := context.WithDeadline(context.Background(), deadline)
 		go w.process(ctx, nil, 0)
@@ -498,7 +502,7 @@ func TestTimeBucketWatchersBasic(t *testing.T) {
 	forget := func() {}
 
 	newWatcher := func(deadline time.Time) *cacheWatcher {
-		return newCacheWatcher(0, filter, forget, testVersioner{}, deadline, true)
+		return newCacheWatcher(0, filter, forget, testVersioner{}, deadline, true, objectType)
 	}
 
 	clock := clock.NewFakeClock(time.Now())