func (r *FakeRuntimeService) ListPodSandbox(filter *runtimeApi.PodSandboxFilter) ([]*runtimeApi.PodSandbox, error) {
	r.Lock()
	defer r.Unlock()

	r.Called = append(r.Called, "ListPodSandbox")

	result := make([]*runtimeApi.PodSandbox, 0)
	for id, s := range r.Sandboxes {
		if filter != nil {
			if filter.Id != nil && filter.GetId() != id {
				continue
			}
			if filter.State != nil && filter.GetState() != s.GetState() {
				continue
			}
			if filter.LabelSelector != nil && !filterInLabels(filter.LabelSelector, s.GetLabels()) {
				continue
			}
		}

		result = append(result, &runtimeApi.PodSandbox{
			Id:          s.Id,
			Metadata:    s.Metadata,
			State:       s.State,
			CreatedAt:   s.CreatedAt,
			Labels:      s.Labels,
			Annotations: s.Annotations,
		})
	}

	return result, nil
}
// ListPodSandbox returns a list of Sandbox.
func (ds *dockerService) ListPodSandbox(filter *runtimeApi.PodSandboxFilter) ([]*runtimeApi.PodSandbox, error) {
	// By default, list all containers whether they are running or not.
	opts := dockertypes.ContainerListOptions{All: true}
	filterOutReadySandboxes := false

	opts.Filter = dockerfilters.NewArgs()
	f := newDockerFilter(&opts.Filter)
	// Add filter to select only sandbox containers.
	f.AddLabel(containerTypeLabelKey, containerTypeLabelSandbox)

	if filter != nil {
		if filter.Id != nil {
			f.Add("id", filter.GetId())
		}
		if filter.State != nil {
			if filter.GetState() == runtimeApi.PodSandBoxState_READY {
				// Only list running containers.
				opts.All = false
			} else {
				// runtimeApi.PodSandBoxState_NOTREADY can mean the
				// container is in any of the non-running state (e.g., created,
				// exited). We can't tell docker to filter out running
				// containers directly, so we'll need to filter them out
				// ourselves after getting the results.
				filterOutReadySandboxes = true
			}
		}

		if filter.LabelSelector != nil {
			for k, v := range filter.LabelSelector {
				f.AddLabel(k, v)
			}
		}
	}
	containers, err := ds.client.ListContainers(opts)
	if err != nil {
		return nil, err
	}

	// Convert docker containers to runtime api sandboxes.
	result := []*runtimeApi.PodSandbox{}
	for i := range containers {
		c := containers[i]
		converted, err := toRuntimeAPISandbox(&c)
		if err != nil {
			glog.V(5).Infof("Unable to convert docker to runtime API sandbox: %v", err)
			continue
		}
		if filterOutReadySandboxes && converted.GetState() == runtimeApi.PodSandBoxState_READY {
			continue
		}

		result = append(result, converted)
	}
	return result, nil
}