[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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