136 lines
3.6 KiB
Python
136 lines
3.6 KiB
Python
# Copyright (c) 2014 Rackspace, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import abc
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import six
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from oslo.config import cfg
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_LIMITS_OPTIONS = [
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cfg.IntOpt('default_services_paging', default=10,
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help='Default services pagination size')
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]
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_LIMITS_GROUP = 'limits:storage'
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@six.add_metaclass(abc.ABCMeta)
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class DriverBase(object):
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"""Base class for both data and control plane drivers
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:param conf: Configuration containing options for this driver.
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:type conf: `oslo.config.ConfigOpts`
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"""
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def __init__(self, conf, providers):
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self.conf = conf
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self.providers = providers
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def providers(self):
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return self.providers
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@six.add_metaclass(abc.ABCMeta)
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class StorageDriverBase(DriverBase):
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"""Interface definition for storage drivers.
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Data plane storage drivers are responsible for implementing the
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core functionality of the system.
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Connection information and driver-specific options are
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loaded from the config file.
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:param conf: Configuration containing options for this driver.
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:type conf: `oslo.config.ConfigOpts`
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"""
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def __init__(self, conf, providers):
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super(StorageDriverBase, self).__init__(conf, providers)
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self.conf.register_opts(_LIMITS_OPTIONS, group=_LIMITS_GROUP)
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self.limits_conf = self.conf[_LIMITS_GROUP]
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@abc.abstractmethod
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def is_alive(self):
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"""Check whether the storage is ready."""
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raise NotImplementedError
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@abc.abstractproperty
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def service_controller(self):
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"""Returns the driver's hostname controller."""
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raise NotImplementedError
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class ControllerBase(object):
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"""Top-level class for controllers.
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:param driver: Instance of the driver
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instantiating this controller.
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"""
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def __init__(self, driver):
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self.driver = driver
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@six.add_metaclass(abc.ABCMeta)
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class ServicesBase(ControllerBase):
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"""This class is responsible for managing Services
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"""
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__metaclass__ = abc.ABCMeta
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def __init__(self, driver):
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super(ServicesBase, self).__init__(driver)
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self.wrapper = ProviderWrapper()
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@abc.abstractmethod
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def list(self, project_id):
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raise NotImplementedError
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@abc.abstractmethod
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def create(self, project_id, service_name, service_json):
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return self.driver.providers.map(
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self.wrapper.create,
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service_name,
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service_json)
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@abc.abstractmethod
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def update(self, project_id, service_name):
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return self.driver.providers.map(self.wrapper.update, service_name)
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@abc.abstractmethod
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def delete(self, project_id, service_name):
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return self.driver.providers.map(self.wrapper.delete, service_name)
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@abc.abstractmethod
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def get(self):
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raise NotImplementedError
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class ProviderWrapper(object):
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def create(self, ext, service_name, service_json):
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return ext.obj.service_controller.create(service_name, service_json)
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def update(self, ext, service_name):
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return ext.obj.service_controller.update(service_name)
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def delete(self, ext, service_name):
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return ext.obj.service_controller.delete(service_name)
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