f572a5eb93
The Modular L2 Plugin uses drivers to support separately extensible sets of network types and of mechanisms for accessing networks of those types. This is an initial implementation that has been tested with the openvswitch and linuxbridge agents, and should also work with the hyperv agent. See quantum/plugins/ml2/README for details. Implements: blueprint modular-l2 Change-Id: Ia8cae480180f0990af7d5e5e56f29eaeac205e0e
134 lines
5.1 KiB
Python
134 lines
5.1 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 quantum.common import exceptions as exc
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from quantum.openstack.common import log
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from quantum.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__('quantum.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 currently a stub class, but it is expected to be
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functional for the H-2 milestone. It currently serves mainly to
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help solidify the architectural distinction between TypeDrivers
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and MechanismDrivers.
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"""
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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__('quantum.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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# TODO(rkukura): Register mechanisms.
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def initialize(self):
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pass
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# TODO(rkukura): Define mechanism dispatch methods
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