ab44545a76
Define the Mechanism Driver interface for create/update/delete operations on networks and ports. For each of these event, the Mechanism Driver provides one method that is called within the database transaction of the ml2 plugin method, and one that is called after the transaction is completed. Support for mechanism drivers is still a work-in-progress, and the interface is subject to change in future versions before the release of Havana. However this initial version should be sufficient to enable others to start defining their own mechanism drivers. Change-Id: Ife30215589792ee27df9897d3b2bc04392638266 Implements: blueprint ml2-mechanism-drivers Fixes: bug #1199977 Fixes: bug #1199978 DocImpact
358 lines
15 KiB
Python
358 lines
15 KiB
Python
# Copyright (c) 2013 OpenStack Foundation
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# All Rights Reserved.
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#
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# 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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import sys
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from oslo.config import cfg
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import stevedore
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from neutron.common import exceptions as exc
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from neutron.openstack.common import log
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from neutron.plugins.ml2.common import exceptions as ml2_exc
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from neutron.plugins.ml2 import driver_api as api
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LOG = log.getLogger(__name__)
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class TypeManager(stevedore.named.NamedExtensionManager):
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"""Manage network segment types using drivers."""
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# Mapping from type name to DriverManager
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drivers = {}
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def __init__(self):
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# REVISIT(rkukura): Need way to make stevedore use our logging
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# configuration. Currently, nothing is logged if loading a
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# driver fails.
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LOG.info(_("Configured type driver names: %s"),
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cfg.CONF.ml2.type_drivers)
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super(TypeManager, self).__init__('neutron.ml2.type_drivers',
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cfg.CONF.ml2.type_drivers,
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invoke_on_load=True)
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LOG.info(_("Loaded type driver names: %s"), self.names())
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self._register_types()
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self._check_tenant_network_types(cfg.CONF.ml2.tenant_network_types)
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def _register_types(self):
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for ext in self:
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type = ext.obj.get_type()
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if type in self.drivers:
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LOG.error(_("Type driver '%(new_driver)s' ignored because type"
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" driver '%(old_driver)s' is already registered"
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" for type '%(type)s'"),
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{'new_driver': ext.name,
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'old_driver': self.drivers[type].name,
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'type': type})
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else:
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self.drivers[type] = ext
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LOG.info(_("Registered types: %s"), self.drivers.keys())
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def _check_tenant_network_types(self, types):
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self.tenant_network_types = []
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for network_type in types:
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if network_type in self.drivers:
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self.tenant_network_types.append(network_type)
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else:
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LOG.error(_("No type driver for tenant network_type: %s. "
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"Service terminated!"),
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network_type)
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sys.exit(1)
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LOG.info(_("Tenant network_types: %s"), self.tenant_network_types)
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def initialize(self):
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for type, driver in self.drivers.iteritems():
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LOG.info(_("Initializing driver for type '%s'"), type)
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driver.obj.initialize()
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def validate_provider_segment(self, segment):
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network_type = segment[api.NETWORK_TYPE]
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driver = self.drivers.get(network_type)
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if driver:
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return driver.obj.validate_provider_segment(segment)
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else:
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msg = _("network_type value '%s' not supported") % network_type
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raise exc.InvalidInput(error_message=msg)
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def reserve_provider_segment(self, session, segment):
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network_type = segment.get(api.NETWORK_TYPE)
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driver = self.drivers.get(network_type)
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driver.obj.reserve_provider_segment(session, segment)
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def allocate_tenant_segment(self, session):
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for network_type in self.tenant_network_types:
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driver = self.drivers.get(network_type)
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segment = driver.obj.allocate_tenant_segment(session)
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if segment:
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return segment
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raise exc.NoNetworkAvailable()
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def release_segment(self, session, segment):
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network_type = segment.get(api.NETWORK_TYPE)
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driver = self.drivers.get(network_type)
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driver.obj.release_segment(session, segment)
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class MechanismManager(stevedore.named.NamedExtensionManager):
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"""Manage networking mechanisms using drivers.
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Note that this is still a work in progress, and the interface
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may change before the final release of Havana.
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"""
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# TODO(apech): add calls for subnets
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# Registered mechanism drivers, keyed by name.
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mech_drivers = {}
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# Ordered list of mechanism drivers, defining
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# the order in which the drivers are called.
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ordered_mech_drivers = []
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def __init__(self):
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# REVISIT(rkukura): Need way to make stevedore use our logging
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# configuration. Currently, nothing is logged if loading a
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# driver fails.
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LOG.info(_("Configured mechanism driver names: %s"),
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cfg.CONF.ml2.mechanism_drivers)
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super(MechanismManager, self).__init__('neutron.ml2.mechanism_drivers',
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cfg.CONF.ml2.mechanism_drivers,
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invoke_on_load=True)
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LOG.info(_("Loaded mechanism driver names: %s"), self.names())
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self._register_mechanisms()
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def _register_mechanisms(self):
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"""Register all mechanism drivers.
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This method should only be called once in the MechanismManager
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constructor.
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"""
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for ext in self:
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if ext.name in self.mech_drivers:
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LOG.error(_("Mechanism driver '%s' ignored because "
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"driver is already registered"),
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ext.name)
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else:
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self.mech_drivers[ext.name] = ext
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self.ordered_mech_drivers.append(ext)
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LOG.info(_("Registered mechanism drivers: %s"),
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[driver.name for driver in self.ordered_mech_drivers])
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def initialize(self):
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for driver in self.ordered_mech_drivers:
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LOG.info(_("Initializing mechanism driver '%s'"), driver.name)
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driver.obj.initialize()
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def _call_on_drivers(self, method_name, context,
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continue_on_failure=False):
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"""Helper method for calling a method across all mechanism 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 mechanism drivers once one has raised an exception
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:raises: neutron.plugins.ml2.common.MechanismDriverError
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if any mechanism driver call fails.
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"""
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error = False
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for driver in self.ordered_mech_drivers:
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try:
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getattr(driver.obj, method_name)(context)
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except Exception:
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LOG.exception(
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_("Mechanism 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 not continue_on_failure:
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break
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if error:
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raise ml2_exc.MechanismDriverError(
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method=method_name
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)
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def create_network_precommit(self, context):
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"""Notify all mechanism drivers of a network creation.
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:raises: neutron.plugins.ml2.common.MechanismDriverError
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if any mechanism driver create_network_precommit call fails.
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Called within the database transaction. If a mechanism driver
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raises an exception, then a MechanismDriverError is propogated
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to the caller, triggering a rollback. There is no guarantee
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that all mechanism drivers are called in this case.
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"""
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self._call_on_drivers("create_network_precommit", context)
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def create_network_postcommit(self, context):
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"""Notify all mechanism drivers of network creation.
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:raises: neutron.plugins.ml2.common.MechanismDriverError
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if any mechanism driver create_network_postcommit call fails.
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Called after the database transaction. If a mechanism driver
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raises an exception, then a MechanismDriverError is propagated
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to the caller, where the network will be deleted, triggering
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any required cleanup. There is no guarantee that all mechanism
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drivers are called in this case.
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"""
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self._call_on_drivers("create_network_postcommit", context)
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def update_network_precommit(self, context):
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"""Notify all mechanism drivers of a network update.
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:raises: neutron.plugins.ml2.common.MechanismDriverError
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if any mechanism driver update_network_precommit call fails.
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Called within the database transaction. If a mechanism driver
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raises an exception, then a MechanismDriverError is propogated
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to the caller, triggering a rollback. There is no guarantee
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that all mechanism drivers are called in this case.
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"""
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self._call_on_drivers("update_network_precommit", context)
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def update_network_postcommit(self, context):
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"""Notify all mechanism drivers of a network update.
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:raises: neutron.plugins.ml2.common.MechanismDriverError
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if any mechanism driver update_network_postcommit call fails.
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Called after the database transaction. If a mechanism driver
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raises an exception, then a MechanismDriverError is propagated
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to the caller, where an error is returned to the user. The
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user is expected to take the appropriate action, whether by
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retrying the call or deleting the network. There is no
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guarantee that all mechanism drivers are called in this case.
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"""
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self._call_on_drivers("update_network_postcommit", context)
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def delete_network_precommit(self, context):
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"""Notify all mechanism drivers of a network deletion.
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:raises: neutron.plugins.ml2.common.MechanismDriverError
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if any mechanism driver delete_network_precommit call fails.
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Called within the database transaction. If a mechanism driver
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raises an exception, then a MechanismDriverError is propogated
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to the caller, triggering a rollback. There is no guarantee
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that all mechanism drivers are called in this case.
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"""
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self._call_on_drivers("delete_network_precommit", context)
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def delete_network_postcommit(self, context):
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"""Notify all mechanism drivers of a network deletion.
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:raises: neutron.plugins.ml2.common.MechanismDriverError
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if any mechanism driver delete_network_postcommit call fails.
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Called after the database transaction. If any mechanism driver
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raises an error, then the error is logged but we continue to
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call every other mechanism driver. A MechanismDriverError is
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then reraised at the end to notify the caller of a failure. In
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general we expect the caller to ignore the error, as the
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network resource has already been deleted from the database
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and it doesn't make sense to undo the action by recreating the
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network.
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"""
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self._call_on_drivers("delete_network_postcommit", context,
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continue_on_failure=True)
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def create_port_precommit(self, context):
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"""Notify all mechanism drivers of a port creation.
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:raises: neutron.plugins.ml2.common.MechanismDriverError
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if any mechanism driver create_port_precommit call fails.
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Called within the database transaction. If a mechanism driver
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raises an exception, then a MechanismDriverError is propogated
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to the caller, triggering a rollback. There is no guarantee
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that all mechanism drivers are called in this case.
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"""
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self._call_on_drivers("create_port_precommit", context)
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def create_port_postcommit(self, context):
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"""Notify all mechanism drivers of port creation.
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:raises: neutron.plugins.ml2.common.MechanismDriverError
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if any mechanism driver create_port_postcommit call fails.
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Called after the database transaction. Errors raised by
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mechanism drivers are left to propogate to the caller, where
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the port will be deleted, triggering any required
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cleanup. There is no guarantee that all mechanism drivers are
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called in this case.
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"""
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self._call_on_drivers("create_port_postcommit", context)
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def update_port_precommit(self, context):
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"""Notify all mechanism drivers of a port update.
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:raises: neutron.plugins.ml2.common.MechanismDriverError
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if any mechanism driver update_port_precommit call fails.
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Called within the database transaction. If a mechanism driver
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raises an exception, then a MechanismDriverError is propogated
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to the caller, triggering a rollback. There is no guarantee
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that all mechanism drivers are called in this case.
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"""
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self._call_on_drivers("update_port_precommit", context)
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def update_port_postcommit(self, context):
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"""Notify all mechanism drivers of a port update.
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:raises: neutron.plugins.ml2.common.MechanismDriverError
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if any mechanism driver update_port_postcommit call fails.
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Called after the database transaction. If a mechanism driver
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raises an exception, then a MechanismDriverError is propagated
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to the caller, where an error is returned to the user. The
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user is expected to take the appropriate action, whether by
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retrying the call or deleting the port. There is no
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guarantee that all mechanism drivers are called in this case.
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"""
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self._call_on_drivers("update_port_postcommit", context)
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def delete_port_precommit(self, context):
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"""Notify all mechanism drivers of a port deletion.
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:raises: neutron.plugins.ml2.common.MechanismDriverError
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if any mechanism driver delete_port_precommit call fails.
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Called within the database transaction. If a mechanism driver
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raises an exception, then a MechanismDriverError is propogated
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to the caller, triggering a rollback. There is no guarantee
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that all mechanism drivers are called in this case.
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"""
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self._call_on_drivers("delete_port_precommit", context)
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def delete_port_postcommit(self, context):
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"""Notify all mechanism drivers of a port deletion.
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:raises: neutron.plugins.ml2.common.MechanismDriverError
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if any mechanism driver delete_port_postcommit call fails.
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Called after the database transaction. If any mechanism driver
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raises an error, then the error is logged but we continue to
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call every other mechanism driver. A MechanismDriverError is
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then reraised at the end to notify the caller of a failure. In
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general we expect the caller to ignore the error, as the
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port resource has already been deleted from the database
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and it doesn't make sense to undo the action by recreating the
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port.
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"""
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self._call_on_drivers("delete_port_postcommit", context,
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continue_on_failure=True)
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