Пример #1
0
func (t *Tester) testUpdateFailsOnVersionTooOld(obj runtime.Object, setFn SetFunc, getFn GetFunc) {
	ctx := t.TestContext()

	foo := copyOrDie(obj)
	t.setObjectMeta(foo, "foo3")

	if err := setFn(ctx, foo); err != nil {
		t.Errorf("unexpected error: %v", err)
	}

	storedFoo, err := getFn(ctx, foo)
	if err != nil {
		t.Errorf("unexpected error: %v", err)
	}

	older := copyOrDie(storedFoo)
	olderMeta := t.getObjectMetaOrFail(older)
	olderMeta.ResourceVersion = "1"

	_, _, err = t.storage.(rest.Updater).Update(t.TestContext(), older)
	if err == nil {
		t.Errorf("Expected an error, but we didn't get one")
	} else if !errors.IsConflict(err) {
		t.Errorf("Expected Conflict error, got '%v'", err)
	}
}
Пример #2
0
// RetryConflict executes the provided function repeatedly, retrying if the server returns a conflicting
// write. Callers should preserve previous executions if they wish to retry changes. It performs an
// exponential backoff.
//
//     var pod *api.Pod
//     err := RetryOnConflict(DefaultBackoff, func() (err error) {
//       pod, err = c.Pods("mynamespace").UpdateStatus(podStatus)
//       return
//     })
//     if err != nil {
//       // may be conflict if max retries were hit
//       return err
//     }
//     ...
//
// TODO: Make Backoff an interface?
func RetryOnConflict(backoff wait.Backoff, fn func() error) error {
	var lastConflictErr error
	err := wait.ExponentialBackoff(backoff, func() (bool, error) {
		err := fn()
		switch {
		case err == nil:
			return true, nil
		case errors.IsConflict(err):
			lastConflictErr = err
			return false, nil
		default:
			return false, err
		}
	})
	if err == wait.ErrWaitTimeout {
		err = lastConflictErr
	}
	return err
}