96 lines
3.2 KiB
Python
96 lines
3.2 KiB
Python
# Copyright 2012 OpenStack Foundation.
|
|
# 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.
|
|
|
|
import abc
|
|
|
|
from oslo_log import log as logging
|
|
from oslo_utils import excutils
|
|
from oslo_utils import importutils
|
|
import six
|
|
|
|
from neutron._i18n import _LE, _LI
|
|
from neutron.api import extensions
|
|
from neutron.db import servicetype_db as sdb
|
|
from neutron.services import provider_configuration as pconf
|
|
from neutron import worker as neutron_worker
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
|
|
@six.add_metaclass(abc.ABCMeta)
|
|
class ServicePluginBase(extensions.PluginInterface,
|
|
neutron_worker.WorkerSupportServiceMixin):
|
|
"""Define base interface for any Advanced Service plugin."""
|
|
supported_extension_aliases = []
|
|
|
|
@abc.abstractmethod
|
|
def get_plugin_type(self):
|
|
"""Return one of predefined service types.
|
|
|
|
See neutron/plugins/common/constants.py
|
|
"""
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def get_plugin_description(self):
|
|
"""Return string description of the plugin."""
|
|
pass
|
|
|
|
|
|
def load_drivers(service_type, plugin):
|
|
"""Loads drivers for specific service.
|
|
|
|
Passes plugin instance to driver's constructor
|
|
"""
|
|
service_type_manager = sdb.ServiceTypeManager.get_instance()
|
|
providers = (service_type_manager.
|
|
get_service_providers(
|
|
None,
|
|
filters={'service_type': [service_type]})
|
|
)
|
|
if not providers:
|
|
msg = (_LE("No providers specified for '%s' service, exiting") %
|
|
service_type)
|
|
LOG.error(msg)
|
|
raise SystemExit(1)
|
|
|
|
drivers = {}
|
|
for provider in providers:
|
|
try:
|
|
drivers[provider['name']] = importutils.import_object(
|
|
provider['driver'], plugin
|
|
)
|
|
LOG.debug("Loaded '%(provider)s' provider for service "
|
|
"%(service_type)s",
|
|
{'provider': provider['driver'],
|
|
'service_type': service_type})
|
|
except ImportError:
|
|
with excutils.save_and_reraise_exception():
|
|
LOG.exception(_LE("Error loading provider '%(provider)s' for "
|
|
"service %(service_type)s"),
|
|
{'provider': provider['driver'],
|
|
'service_type': service_type})
|
|
|
|
default_provider = None
|
|
try:
|
|
provider = service_type_manager.get_default_service_provider(
|
|
None, service_type)
|
|
default_provider = provider['name']
|
|
except pconf.DefaultServiceProviderNotFound:
|
|
LOG.info(_LI("Default provider is not specified for service type %s"),
|
|
service_type)
|
|
|
|
return drivers, default_provider
|