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from abc import ABCMeta, abstractmethod
class VppObject(object):
""" Abstract vpp object """
__metaclass__ = ABCMeta
def __init__(self):
VppObjectRegistry().register(self)
@abstractmethod
def add_vpp_config(self):
""" Add the configuration for this object to vpp. """
pass
@abstractmethod
def query_vpp_config(self):
"""Query the vpp configuration.
:return: True if the object is configured"""
pass
@abstractmethod
def remove_vpp_config(self):
""" Remove the configuration for this object from vpp. """
pass
@abstractmethod
def object_id(self):
""" Return a unique string representing this object. """
pass
class VppObjectRegistry(object):
""" Class which handles automatic configuration cleanup. """
_shared_state = {}
def __init__(self):
self.__dict__ = self._shared_state
if not hasattr(self, "_object_registry"):
self._object_registry = []
if not hasattr(self, "_object_dict"):
self._object_dict = dict()
def register(self, o, logger):
""" Register an object in the registry. """
if not o.object_id() in self._object_dict:
self._object_registry.append(o)
self._object_dict[o.object_id()] = o
else:
logger.debug("REG: duplicate add, ignoring (%s)" % o)
def remove_vpp_config(self, logger):
"""
Remove configuration (if present) from vpp and then remove all objects
from the registry.
"""
if not self._object_registry:
logger.info("REG: No objects registered for auto-cleanup.")
return
logger.info("REG: Removing VPP configuration for registered objects")
# remove the config in reverse order as there might be dependencies
for o in reversed(self._object_registry):
if o.query_vpp_config():
logger.info("REG: Removing configuration for %s" % o)
o.remove_vpp_config()
else:
logger.info(
"REG: Skipping removal for %s, configuration not present" %
o)
failed = []
for o in self._object_registry:
if o.query_vpp_config():
failed.append(o)
self._object_registry = []
self._object_dict = dict()
if failed:
logger.error("REG: Couldn't remove configuration for object(s):")
for x in failed:
logger.error(repr(x))
raise Exception("Couldn't remove configuration for object(s): %s" %
(", ".join(str(x) for x in failed)))
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