text: # Copyright (c) 2016 Mirantis, Inc.
  # All Rights Reserved.
  #
  #    Licensed under the Apache License, Version 2.0 (the "License"); you may
  #    not use this file except in compliance with the License. You may obtain
  #    a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #    Unless required by applicable law or agreed to in writing, software
  #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  #    License for the specific language governing permissions and limitations
  #    under the License.
  
  import abc
  import six
  
  from os_vif import objects as obj_vif
  from oslo_log import log as logging
  from oslo_serialization import jsonutils
  
  from kuryr_kubernetes.cni.binding import base as b_base
  from kuryr_kubernetes import constants as k_const
  from kuryr_kubernetes.handlers import dispatch as k_dis
  from kuryr_kubernetes.handlers import k8s_base
  
  LOG = logging.getLogger(__name__)
  
  
  @six.add_metaclass(abc.ABCMeta)
  class CNIHandlerBase(k8s_base.ResourceEventHandler):
      OBJECT_KIND = k_const.K8S_OBJ_POD
  
      def __init__(self, cni, on_done):
          self._cni = cni
          self._callback = on_done
          self._vif = None
  
      def on_present(self, pod):
          vif = self._get_vif(pod)
  
          if vif:
              self.on_vif(pod, vif)
  
      @abc.abstractmethod
      def on_vif(self, pod, vif):
          raise NotImplementedError()
  
      def _get_vif(self, pod):
          # TODO(ivc): same as VIFHandler._get_vif
          try:
              annotations = pod['metadata']['annotations']
              vif_annotation = annotations[k_const.K8S_ANNOTATION_VIF]
          except KeyError:
              return None
          vif_dict = jsonutils.loads(vif_annotation)
          vif = obj_vif.vif.VIFBase.obj_from_primitive(vif_dict)
          LOG.debug("Got VIF from annotation: %r", vif)
          return vif
  
      def _get_inst(self, pod):
          return obj_vif.instance_info.InstanceInfo(
              uuid=pod['metadata']['uid'], name=pod['metadata']['name'])
  
  
  class AddHandler(CNIHandlerBase):
  
      def __init__(self, cni, on_done):
          LOG.debug("AddHandler called with CNI env: %r", cni)
          super(AddHandler, self).__init__(cni, on_done)
          self._vif = None
  
      def on_vif(self, pod, vif):
          if not self._vif:
              self._vif = vif.obj_clone()
              self._vif.active = True
              b_base.connect(self._vif, self._get_inst(pod),
                             self._cni.CNI_IFNAME, self._cni.CNI_NETNS)
  
          if vif.active:
              self._callback(vif)
  
  
  class DelHandler(CNIHandlerBase):
  
      def on_vif(self, pod, vif):
          b_base.disconnect(vif, self._get_inst(pod),
                            self._cni.CNI_IFNAME, self._cni.CNI_NETNS)
          self._callback(vif)
  
  
  class CallbackHandler(CNIHandlerBase):
  
      def __init__(self, on_vif, on_del=None):
          super(CallbackHandler, self).__init__(None, on_vif)
          self._del_callback = on_del
  
      def on_vif(self, pod, vif):
          self._callback(pod, vif)
  
      def on_deleted(self, pod):
          LOG.debug("Got pod %s deletion event.", pod['metadata']['name'])
          if self._del_callback:
              self._del_callback(pod)
  
  
  class CNIPipeline(k_dis.EventPipeline):
  
      def _wrap_dispatcher(self, dispatcher):
          return dispatcher
  
      def _wrap_consumer(self, consumer):
          return consumer
  