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# Copyright 2015 Futurewei. 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.
from oslo_config import cfg
from oslo_log import log
import stevedore
from neutron.i18n import _LE
from neutron.i18n import _LI
from networking_sfc.services.flowclassifier.common import exceptions as fc_exc
LOG = log.getLogger(__name__)
cfg.CONF.import_opt('drivers',
'networking_sfc.services.flowclassifier.common.config',
group='flowclassifier')
class FlowClassifierDriverManager(stevedore.named.NamedExtensionManager):
"""Implementation of Flow Classifier drivers."""
def __init__(self):
# Registered flow classifier drivers, keyed by name.
self.drivers = {}
# Ordered list of flow classifier drivers, defining
# the order in which the drivers are called.
self.ordered_drivers = []
LOG.info(_LI("Configured Flow Classifier drivers: %s"),
cfg.CONF.flowclassifier.drivers)
super(FlowClassifierDriverManager, self).__init__(
'networking_sfc.flowclassifier.drivers',
cfg.CONF.flowclassifier.drivers,
invoke_on_load=True,
name_order=True)
LOG.info(_LI("Loaded Flow Classifier drivers: %s"),
self.names())
self._register_drivers()
def _register_drivers(self):
"""Register all Flow Classifier drivers.
This method should only be called once in the
FlowClassifierDriverManager constructor.
"""
for ext in self:
self.drivers[ext.name] = ext
self.ordered_drivers.append(ext)
LOG.info(_LI("Registered Flow Classifier drivers: %s"),
[driver.name for driver in self.ordered_drivers])
def initialize(self):
# ServiceChain bulk operations requires each driver to support them
self.native_bulk_support = True
for driver in self.ordered_drivers:
LOG.info(_LI("Initializing Flow Classifier driver '%s'"),
driver.name)
driver.obj.initialize()
self.native_bulk_support &= getattr(driver.obj,
'native_bulk_support', True)
def _call_drivers(self, method_name, context):
"""Helper method for calling a method across all drivers.
:param method_name: name of the method to call
:param context: context parameter to pass to each method call
:param continue_on_failure: whether or not to continue to call
all SFC drivers once one has raised an exception
if any Flow Classifier driver call fails.
"""
for driver in self.ordered_drivers:
try:
getattr(driver.obj, method_name)(context)
except Exception as e:
# This is an internal failure.
LOG.exception(e)
LOG.error(
_LE("Flow Classifier driver '%(name)s'"
"failed in %(method)s"),
{'name': driver.name, 'method': method_name}
)
raise fc_exc.FlowClassifierDriverError(
method=method_name
)
def create_flow_classifier(self, context):
self._call_drivers("create_flow_classifier", context)
def update_flow_classifier(self, context):
self._call_drivers("update_flow_classifier", context)
def delete_flow_classifier(self, context):
self._call_drivers("delete_flow_classifier", context)
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