server: split sandboxes actions

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

server/container.go

@@ -0,0 +1,29 @@
+package server
+
+import (
+	"fmt"
+
+	"github.com/kubernetes-incubator/cri-o/oci"
+)
+
+type containerRequest interface {
+	GetContainerId() string
+}
+
+func (s *Server) getContainerFromRequest(req containerRequest) (*oci.Container, error) {
+	ctrID := req.GetContainerId()
+	if ctrID == "" {
+		return nil, fmt.Errorf("container ID should not be empty")
+	}
+
+	containerID, err := s.ctrIDIndex.Get(ctrID)
+	if err != nil {
+		return nil, fmt.Errorf("container with ID starting with %s not found: %v", ctrID, err)
+	}
+
+	c := s.state.containers.Get(containerID)
+	if c == nil {
+		return nil, fmt.Errorf("specified container not found: %s", containerID)
+	}
+	return c, nil
+}