Add "Sandboxes" to the kubecontainer.Pod

This field will only be used by the kuberuntime package and should be ignored
by other type of runtimes.

pkg/kubelet/container/runtime.go

@@ -153,6 +153,11 @@ type Pod struct {
 	// List of containers that belongs to this pod. It may contain only
 	// running containers, or mixed with dead ones (when GetPods(true)).
 	Containers []*Container
+	// List of sandboxes associated with this pod. The sandboxes are converted
+	// to Container temporariliy to avoid substantial changes to other
+	// components. This is only populated by kuberuntime.
+	// TODO: use the runtimeApi.PodSandbox type directly.
+	Sandboxes []*Container
 }
 
 // PodPair contains both runtime#Pod and api#Pod

pkg/kubelet/kuberuntime/helpers.go

@@ -64,6 +64,21 @@ func toKubeContainerState(state runtimeApi.ContainerState) kubecontainer.Contain
 	return kubecontainer.ContainerStateUnknown
 }
 
+// sandboxToKubeContainerState converts runtimeApi.PodSandboxState to
+// kubecontainer.ContainerState.
+// This is only needed because we need to return sandboxes as if they were
+// kubecontainer.Containers to avoid substantial changes to PLEG.
+// TODO: Remove this once it becomes obsolete.
+func sandboxToKubeContainerState(state runtimeApi.PodSandBoxState) kubecontainer.ContainerState {
+	switch state {
+	case runtimeApi.PodSandBoxState_READY:
+		return kubecontainer.ContainerStateRunning
+	case runtimeApi.PodSandBoxState_NOTREADY:
+		return kubecontainer.ContainerStateExited
+	}
+	return kubecontainer.ContainerStateUnknown
+}
+
 // toRuntimeProtocol converts api.Protocol to runtimeApi.Protocol.
 func toRuntimeProtocol(protocol api.Protocol) runtimeApi.Protocol {
 	switch protocol {
@@ -94,6 +109,21 @@ func (m *kubeGenericRuntimeManager) toKubeContainer(c *runtimeApi.Container) (*k
 	}, nil
 }
 
+// sandboxToKubeContainer converts runtimeApi.PodSandbox to kubecontainer.Container.
+// This is only needed because we need to return sandboxes as if they were
+// kubecontainer.Containers to avoid substantial changes to PLEG.
+// TODO: Remove this once it becomes obsolete.
+func (m *kubeGenericRuntimeManager) sandboxToKubeContainer(s *runtimeApi.PodSandbox) (*kubecontainer.Container, error) {
+	if s == nil || s.Id == nil || s.State == nil {
+		return nil, fmt.Errorf("unable to convert a nil pointer to a runtime container")
+	}
+
+	return &kubecontainer.Container{
+		ID:    kubecontainer.ContainerID{Type: m.runtimeName, ID: s.GetId()},
+		State: sandboxToKubeContainerState(s.GetState()),
+	}, nil
+}
+
 // milliCPUToShares converts milliCPU to CPU shares
 func milliCPUToShares(milliCPU int64) int64 {
 	if milliCPU == 0 {

pkg/kubelet/kuberuntime/kuberuntime_manager.go

@@ -231,11 +231,20 @@ func (m *kubeGenericRuntimeManager) GetPods(all bool) ([]*kubecontainer.Pod, err
 	}
 	for _, s := range sandboxes {
 		podUID := kubetypes.UID(s.Metadata.GetUid())
-		pods[podUID] = &kubecontainer.Pod{
-			ID:        podUID,
-			Name:      s.Metadata.GetName(),
-			Namespace: s.Metadata.GetNamespace(),
+		if _, ok := pods[podUID]; !ok {
+			pods[podUID] = &kubecontainer.Pod{
+				ID:        podUID,
+				Name:      s.Metadata.GetName(),
+				Namespace: s.Metadata.GetNamespace(),
+			}
 		}
+		p := pods[podUID]
+		converted, err := m.sandboxToKubeContainer(s)
+		if err != nil {
+			glog.Warningf("Convert %q sandbox %v of pod %q failed: %v", m.runtimeName, s, podUID, err)
+			continue
+		}
+		p.Sandboxes = append(p.Sandboxes, converted)
 	}
 
 	containers, err := m.getKubeletContainers(all)

pkg/kubelet/kuberuntime/kuberuntime_manager_test.go

@@ -200,7 +200,7 @@ func TestGetPods(t *testing.T) {
 	}
 
 	// Set fake sandbox and fake containers to fakeRuntime.
-	_, fakeContainers, err := makeAndSetFakePod(m, fakeRuntime, pod)
+	fakeSandbox, fakeContainers, err := makeAndSetFakePod(m, fakeRuntime, pod)
 	assert.NoError(t, err)
 
 	// Convert the fakeContainers to kubecontainer.Container
@@ -220,12 +220,25 @@ func TestGetPods(t *testing.T) {
 		}
 		containers[i] = c
 	}
+	// Convert fakeSandbox to kubecontainer.Container
+	sandbox, err := m.sandboxToKubeContainer(&runtimeApi.PodSandbox{
+		Id:        fakeSandbox.Id,
+		Metadata:  fakeSandbox.Metadata,
+		State:     fakeSandbox.State,
+		CreatedAt: fakeSandbox.CreatedAt,
+		Labels:    fakeSandbox.Labels,
+	})
+	if err != nil {
+		t.Fatalf("unexpected error %v", err)
+	}
+
 	expected := []*kubecontainer.Pod{
 		{
 			ID:         kubetypes.UID("12345678"),
 			Name:       "foo",
 			Namespace:  "new",
 			Containers: []*kubecontainer.Container{containers[0], containers[1]},
+			Sandboxes:  []*kubecontainer.Container{sandbox},
 		},
 	}