185 lines
7.4 KiB
Python
185 lines
7.4 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from oslo_config import cfg
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from oslo_log import log
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import stevedore
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from gbpservice._i18n import _LE
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from gbpservice._i18n import _LI
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from gbpservice.neutron.services.servicechain.common import (
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exceptions as sc_exc)
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LOG = log.getLogger(__name__)
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cfg.CONF.import_opt(
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'servicechain_drivers',
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'gbpservice.neutron.services.servicechain.plugins.msc.config',
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group='servicechain')
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class DriverManager(stevedore.named.NamedExtensionManager):
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"""Route servicechain APIs to servicechain drivers.
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"""
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def __init__(self):
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# Registered servicechain drivers, keyed by name.
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self.drivers = {}
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# Ordered list of servicechain drivers, defining
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# the order in which the drivers are called.
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self.ordered_drivers = []
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LOG.info(_LI("Configured servicechain driver names: %s"),
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cfg.CONF.servicechain.servicechain_drivers)
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super(DriverManager,
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self).__init__(
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'gbpservice.neutron.servicechain.servicechain_drivers',
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cfg.CONF.servicechain.servicechain_drivers,
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invoke_on_load=True, name_order=True)
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LOG.info(_LI("Loaded servicechain driver names: %s"), self.names())
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self._register_drivers()
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def _register_drivers(self):
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"""Register all servicechain drivers.
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This method should only be called once in the DriverManager
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constructor.
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"""
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for ext in self:
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self.drivers[ext.name] = ext
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self.ordered_drivers.append(ext)
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LOG.info(_LI("Registered servicechain drivers: %s"),
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[driver.name for driver in self.ordered_drivers])
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def initialize(self):
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# ServiceChain bulk operations requires each driver to support them
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self.native_bulk_support = True
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for driver in self.ordered_drivers:
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LOG.info(_LI("Initializing servicechain driver '%s'"), driver.name)
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driver.obj.initialize()
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self.native_bulk_support &= getattr(driver.obj,
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'native_bulk_support', True)
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def _call_on_drivers(self, method_name, context):
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"""Helper method for calling a method across all servicechain drivers.
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:param method_name: name of the method to call
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:param context: context parameter to pass to each method call
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:param continue_on_failure: whether or not to continue to call
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all servicechain drivers once one has raised an exception
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:raises: neutron.services.servicechain.common.ServiceChainDriverError
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if any servicechain driver call fails.
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"""
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error = False
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for driver in self.ordered_drivers:
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try:
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getattr(driver.obj, method_name)(context)
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except sc_exc.ServiceChainException:
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# This is an exception for the user.
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raise
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except Exception:
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# This is an internal failure.
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LOG.exception(
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_LE("ServiceChain driver '%(name)s' failed in %(method)s"),
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{'name': driver.name, 'method': method_name}
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)
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error = True
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if error:
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raise sc_exc.ServiceChainDriverError(
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method=method_name
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)
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def create_servicechain_node_precommit(self, context):
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self._call_on_drivers("create_servicechain_node_precommit", context)
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def create_servicechain_node_postcommit(self, context):
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self._call_on_drivers("create_servicechain_node_postcommit", context)
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def update_servicechain_node_precommit(self, context):
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self._call_on_drivers("update_servicechain_node_precommit", context)
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def update_servicechain_node_postcommit(self, context):
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self._call_on_drivers("update_servicechain_node_postcommit", context)
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def delete_servicechain_node_precommit(self, context):
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self._call_on_drivers("delete_servicechain_node_precommit", context)
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def delete_servicechain_node_postcommit(self, context):
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self._call_on_drivers("delete_servicechain_node_postcommit", context)
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def create_servicechain_spec_precommit(self, context):
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self._call_on_drivers("create_servicechain_spec_precommit", context)
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def create_servicechain_spec_postcommit(self, context):
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self._call_on_drivers("create_servicechain_spec_postcommit", context)
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def update_servicechain_spec_precommit(self, context):
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self._call_on_drivers("update_servicechain_spec_precommit", context)
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def update_servicechain_spec_postcommit(self, context):
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self._call_on_drivers("update_servicechain_spec_postcommit", context)
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def delete_servicechain_spec_precommit(self, context):
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self._call_on_drivers("delete_servicechain_spec_precommit", context)
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def delete_servicechain_spec_postcommit(self, context):
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self._call_on_drivers("delete_servicechain_spec_postcommit", context)
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def create_servicechain_instance_precommit(self, context):
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self._call_on_drivers("create_servicechain_instance_precommit",
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context)
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def create_servicechain_instance_postcommit(self, context):
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self._call_on_drivers("create_servicechain_instance_postcommit",
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context)
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def update_servicechain_instance_precommit(self, context):
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self._call_on_drivers("update_servicechain_instance_precommit",
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context)
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def update_servicechain_instance_postcommit(self, context):
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self._call_on_drivers("update_servicechain_instance_postcommit",
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context)
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def delete_servicechain_instance_precommit(self, context):
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self._call_on_drivers("delete_servicechain_instance_precommit",
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context)
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def delete_servicechain_instance_postcommit(self, context):
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self._call_on_drivers("delete_servicechain_instance_postcommit",
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context)
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def create_service_profile_precommit(self, context):
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self._call_on_drivers("create_service_profile_precommit",
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context)
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def create_service_profile_postcommit(self, context):
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self._call_on_drivers("create_service_profile_postcommit",
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context)
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def update_service_profile_precommit(self, context):
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self._call_on_drivers("update_service_profile_precommit",
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context)
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def update_service_profile_postcommit(self, context):
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self._call_on_drivers("update_service_profile_postcommit",
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context)
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def delete_service_profile_precommit(self, context):
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self._call_on_drivers("delete_service_profile_precommit",
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context)
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def delete_service_profile_postcommit(self, context):
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self._call_on_drivers("delete_service_profile_postcommit",
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context)
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