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octavia/octavia/api/drivers/driver_factory.py

51 lines
1.8 KiB

# Copyright 2018 Rackspace, US Inc.
#
# 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.
from oslo_config import cfg
from oslo_log import log as logging
from stevedore import driver as stevedore_driver
from wsme import types as wtypes
from octavia.common import exceptions
CONF = cfg.CONF
LOG = logging.getLogger(__name__)
def get_driver(provider):
# If this came in None it must be a load balancer that existed before
# provider support was added. These must be of type 'amphora' and not
# whatever the current "default" is set to.
if isinstance(provider, wtypes.UnsetType):
provider = CONF.api_settings.default_provider_driver
elif not provider:
provider = 'amphora'
if provider not in CONF.api_settings.enabled_provider_drivers:
LOG.warning("Requested provider driver '%s' was not enabled in the "
"configuration file.", provider)
raise exceptions.ProviderNotEnabled(prov=provider)
try:
driver = stevedore_driver.DriverManager(
namespace='octavia.api.drivers',
name=provider,
invoke_on_load=True).driver
driver.name = provider
except Exception as e:
LOG.error('Unable to load provider driver %s due to: %s',
provider, e)
raise exceptions.ProviderNotFound(prov=provider)
return driver