Add initial sandbox management implementation

Signed-off-by: Random-Liu <lantaol@google.com>

pkg/server/sandbox_status.go

@@ -17,14 +17,85 @@ limitations under the License.
 package server
 
 import (
-	"errors"
+	"fmt"
 
+	"github.com/golang/glog"
 	"golang.org/x/net/context"
 
+	"github.com/containerd/containerd/api/services/execution"
+	"github.com/containerd/containerd/api/types/container"
+
 	"k8s.io/kubernetes/pkg/kubelet/api/v1alpha1/runtime"
+
+	"github.com/kubernetes-incubator/cri-containerd/pkg/metadata"
 )
 
 // PodSandboxStatus returns the status of the PodSandbox.
-func (c *criContainerdService) PodSandboxStatus(ctx context.Context, r *runtime.PodSandboxStatusRequest) (*runtime.PodSandboxStatusResponse, error) {
-	return nil, errors.New("not implemented")
+func (c *criContainerdService) PodSandboxStatus(ctx context.Context, r *runtime.PodSandboxStatusRequest) (retRes *runtime.PodSandboxStatusResponse, retErr error) {
+	glog.V(4).Infof("PodSandboxStatus for sandbox %q", r.GetPodSandboxId())
+	defer func() {
+		if retErr == nil {
+			glog.V(4).Infof("PodSandboxStatus returns status %+v", retRes.GetStatus())
+		}
+	}()
+
+	sandbox, err := c.getSandbox(r.GetPodSandboxId())
+	if err != nil {
+		return nil, fmt.Errorf("failed to find sandbox %q: %v", r.GetPodSandboxId(), err)
+	}
+	if sandbox == nil {
+		return nil, fmt.Errorf("sandbox %q does not exist", r.GetPodSandboxId())
+	}
+	// Use the full sandbox id.
+	id := sandbox.ID
+
+	info, err := c.containerService.Info(ctx, &execution.InfoRequest{ID: id})
+	if err != nil && !isContainerdContainerNotExistError(err) {
+		return nil, fmt.Errorf("failed to get sandbox container info for %q: %v", id, err)
+	}
+
+	// Set sandbox state to NOTREADY by default.
+	state := runtime.PodSandboxState_SANDBOX_NOTREADY
+	// If the sandbox container is running, treat it as READY.
+	if info != nil && info.Status == container.Status_RUNNING {
+		state = runtime.PodSandboxState_SANDBOX_READY
+	}
+
+	return &runtime.PodSandboxStatusResponse{Status: toCRISandboxStatus(sandbox, state)}, nil
+}
+
+// toCRISandboxStatus converts sandbox metadata into CRI pod sandbox status.
+func toCRISandboxStatus(meta *metadata.SandboxMetadata, state runtime.PodSandboxState) *runtime.PodSandboxStatus {
+	nsOpts := meta.Config.GetLinux().GetSecurityContext().GetNamespaceOptions()
+	netNS := meta.NetNS
+	if state == runtime.PodSandboxState_SANDBOX_NOTREADY {
+		// Return empty network namespace when sandbox is not ready.
+		// For kubenet, when sandbox is not running, both empty
+		// network namespace and a valid permanent network namespace
+		// work. Go with the first option here because it's the current
+		// behavior in Kubernetes.
+		netNS = ""
+	}
+	return &runtime.PodSandboxStatus{
+		Id:        meta.ID,
+		Metadata:  meta.Config.GetMetadata(),
+		State:     state,
+		CreatedAt: meta.CreatedAt,
+		// TODO(random-liu): [P0] Get sandbox ip from network plugin.
+		Network: &runtime.PodSandboxNetworkStatus{},
+		Linux: &runtime.LinuxPodSandboxStatus{
+			Namespaces: &runtime.Namespace{
+				// TODO(random-liu): Revendor new CRI version and get
+				// rid of this field.
+				Network: netNS,
+				Options: &runtime.NamespaceOption{
+					HostNetwork: nsOpts.GetHostNetwork(),
+					HostPid:     nsOpts.GetHostPid(),
+					HostIpc:     nsOpts.GetHostIpc(),
+				},
+			},
+		},
+		Labels:      meta.Config.GetLabels(),
+		Annotations: meta.Config.GetAnnotations(),
+	}
 }