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[Launchpad Bug Tracker <2031085@xxxxxxxxxxxxxxxxxx>]

[Expired for neutron because there has been no activity for 60 days.]

** Changed in: neutron
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/2031085

Title:
  error in callback mechanism

Status in neutron:
  Expired

Bug description:
  Version: train
  Deatils:
    when create or delete trunk, agent do not receive notification. neutron server error log output:
  Error during notification for neutron.services.trunk.rpc.backend.ServerSideRpcBackend.process_event-8351463 trunk, after_create: AttributeError: 'ServerSideRpcBackend' object has no attribute '_stub'
  Traceback (most recent call last):
    File "/usr/lib/python3.7/site-packages/neutron_lib/callbacks/manager.py", line 199, in _notify_loop
    callback(resource, event, trigger, **kwargs)
  File "/usr/lib/python3.7/site-packages/neutron/services/trunk/rpc/backend.py", line 58, in process_event
    events.AFTER_CREATE: self._stub.trunk_created,
  AttributeError: 'ServerSideRpcBackend' object has no attribute '_stub'

  Root reason: ServerSideRpcBackend decorated by
  neutron_lib.callbacks.registry.has_registry_receivers and replace
  __new__ method, when create ServerSideRpcBackend instance and throw
  exception in __init__,  the replacement __new__ method does not know
  and already registerd callbacks.

  Example:

  from neutron_lib.callbacks import registry

  class BClass(object):
      def __init__(self):
          raise IOError()

  @registry.has_registry_receivers
  class AClass(object):

      def __init__(self):
          self.b = BClass()
          self.a = 1

      @registry.receives("test", ["after_create"])
      def test(self):
          pass

  if __name__ == '__main__':
      try:
          a = AClass()
      except BaseException:
          print('error')
      print(registry._CALLBACK_MANAGER._callbacks)

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