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
}
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)
}