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