Add initial sandbox management implementation

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

pkg/server/sandbox_remove.go

@@ -17,15 +17,75 @@ 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"
+
 	"k8s.io/kubernetes/pkg/kubelet/api/v1alpha1/runtime"
 )
 
 // RemovePodSandbox removes the sandbox. If there are running containers in the
 // sandbox, they should be forcibly removed.
-func (c *criContainerdService) RemovePodSandbox(ctx context.Context, r *runtime.RemovePodSandboxRequest) (*runtime.RemovePodSandboxResponse, error) {
-	return nil, errors.New("not implemented")
+func (c *criContainerdService) RemovePodSandbox(ctx context.Context, r *runtime.RemovePodSandboxRequest) (retRes *runtime.RemovePodSandboxResponse, retErr error) {
+	glog.V(2).Infof("RemovePodSandbox for sandbox %q", r.GetPodSandboxId())
+	defer func() {
+		if retErr == nil {
+			glog.V(2).Info("RemovePodSandbox returns successfully")
+		}
+	}()
+
+	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 {
+		// Do not return error if the id doesn't exist.
+		glog.V(5).Infof("RemovePodSandbox called for sandbox %q that does not exist",
+			r.GetPodSandboxId())
+		return &runtime.RemovePodSandboxResponse{}, nil
+	}
+	// Use the full sandbox id.
+	id := sandbox.ID
+
+	// TODO(random-liu): [P2] Remove all containers in the sandbox.
+
+	// Return error if sandbox container is not fully stopped.
+	_, 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)
+	}
+	if err == nil {
+		return nil, fmt.Errorf("sandbox container %q is not fully stopped", id)
+	}
+
+	// TODO(random-liu): [P0] Cleanup shm created in RunPodSandbox.
+	// TODO(random-liu): [P1] Remove permanent namespace once used.
+
+	// Cleanup the sandbox root directory.
+	sandboxRootDir := getSandboxRootDir(c.rootDir, id)
+	if err := c.os.RemoveAll(sandboxRootDir); err != nil {
+		return nil, fmt.Errorf("failed to remove sandbox root directory %q: %v",
+			sandboxRootDir, err)
+	}
+
+	// Remove sandbox metadata from metadata store. Note that once the sandbox
+	// metadata is successfully deleted:
+	// 1) ListPodSandbox will not include this sandbox.
+	// 2) PodSandboxStatus and StopPodSandbox will return error.
+	// 3) On-going operations which have held the metadata reference will not be
+	// affected.
+	if err := c.sandboxStore.Delete(id); err != nil {
+		return nil, fmt.Errorf("failed to delete sandbox metadata for %q: %v", id, err)
+	}
+
+	// Release the sandbox id from id index.
+	c.sandboxIDIndex.Delete(id) // nolint: errcheck
+
+	// Release the sandbox name reserved for the sandbox.
+	c.sandboxNameIndex.ReleaseByKey(id)
+
+	return &runtime.RemovePodSandboxResponse{}, nil
 }