Exemplo n.º 1
0
func (w *watchCache) GetAllEventsSinceThreadUnsafe(resourceVersion uint64) ([]watchCacheEvent, error) {
	size := w.endIndex - w.startIndex
	oldest := w.resourceVersion
	if size > 0 {
		oldest = w.cache[w.startIndex%w.capacity].resourceVersion
	}
	if resourceVersion == 0 {
		// resourceVersion = 0 means that we don't require any specific starting point
		// and we would like to start watching from ~now.
		// However, to keep backward compatibility, we additionally need to return the
		// current state and only then start watching from that point.
		//
		// TODO: In v2 api, we should stop returning the current state - #13969.
		allItems := w.store.List()
		result := make([]watchCacheEvent, len(allItems))
		for i, item := range allItems {
			result[i] = watchCacheEvent{Type: watch.Added, Object: item.(runtime.Object)}
		}
		return result, nil
	}
	if resourceVersion < oldest-1 {
		return nil, errors.NewGone(fmt.Sprintf("too old resource version: %d (%d)", resourceVersion, oldest-1))
	}

	// Binary search the smallest index at which resourceVersion is greater than the given one.
	f := func(i int) bool {
		return w.cache[(w.startIndex+i)%w.capacity].resourceVersion > resourceVersion
	}
	first := sort.Search(size, f)
	result := make([]watchCacheEvent, size-first)
	for i := 0; i < size-first; i++ {
		result[i] = w.cache[(w.startIndex+first+i)%w.capacity].watchCacheEvent
	}
	return result, nil
}
Exemplo n.º 2
0
func TestWatch(t *testing.T) {
	server, etcdStorage := newEtcdTestStorage(t, testapi.Default.Codec(), etcdtest.PathPrefix())
	// Inject one list error to make sure we test the relist case.
	etcdStorage = &injectListError{errors: 1, Interface: etcdStorage}
	defer server.Terminate(t)
	cacher := newTestCacher(etcdStorage)
	defer cacher.Stop()

	podFoo := makeTestPod("foo")
	podBar := makeTestPod("bar")

	podFooPrime := makeTestPod("foo")
	podFooPrime.Spec.NodeName = "fakeNode"

	podFooBis := makeTestPod("foo")
	podFooBis.Spec.NodeName = "anotherFakeNode"

	// initialVersion is used to initate the watcher at the beginning of the world,
	// which is not defined precisely in etcd.
	initialVersion, err := cacher.LastSyncResourceVersion()
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}
	startVersion := strconv.Itoa(int(initialVersion))

	// Set up Watch for object "podFoo".
	watcher, err := cacher.Watch(context.TODO(), "pods/ns/foo", startVersion, storage.Everything)
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}
	defer watcher.Stop()

	fooCreated := updatePod(t, etcdStorage, podFoo, nil)
	_ = updatePod(t, etcdStorage, podBar, nil)
	fooUpdated := updatePod(t, etcdStorage, podFooPrime, fooCreated)

	verifyWatchEvent(t, watcher, watch.Added, podFoo)
	verifyWatchEvent(t, watcher, watch.Modified, podFooPrime)

	// Check whether we get too-old error via the watch channel
	tooOldWatcher, err := cacher.Watch(context.TODO(), "pods/ns/foo", "1", storage.Everything)
	if err != nil {
		t.Fatalf("Expected no direct error, got %v", err)
	}
	defer tooOldWatcher.Stop()
	// Ensure we get a "Gone" error
	expectedGoneError := errors.NewGone("").ErrStatus
	verifyWatchEvent(t, tooOldWatcher, watch.Error, &expectedGoneError)

	initialWatcher, err := cacher.Watch(context.TODO(), "pods/ns/foo", fooCreated.ResourceVersion, storage.Everything)
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}
	defer initialWatcher.Stop()

	verifyWatchEvent(t, initialWatcher, watch.Modified, podFooPrime)

	// Now test watch from "now".
	nowWatcher, err := cacher.Watch(context.TODO(), "pods/ns/foo", "0", storage.Everything)
	if err != nil {
		t.Fatalf("Unexpected error: %v", err)
	}
	defer nowWatcher.Stop()

	verifyWatchEvent(t, nowWatcher, watch.Added, podFooPrime)

	_ = updatePod(t, etcdStorage, podFooBis, fooUpdated)

	verifyWatchEvent(t, nowWatcher, watch.Modified, podFooBis)
}