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# Copyright 2012-2013 OpenStack, LLC.

#

# 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.

#

"""Manage access to the clients, including authenticating when needed."""

import logging

from openstackclient.compute import client as compute_client

from openstackclient.identity import client as identity_client

from openstackclient.image import client as image_client

from openstackclient.volume import client as volume_client

LOG = logging.getLogger(__name__)

class ClientCache(object):

"""Descriptor class for caching created client handles."""

def __init__(self, factory):

self.factory = factory

self._handle = None

def __get__(self, instance, owner):

# Tell the ClientManager to login to keystone

if self._handle is None:

self._handle = self.factory(instance)

return self._handle

class ClientManager(object):

"""Manages access to API clients, including authentication."""

compute = ClientCache(compute_client.make_client)

identity = ClientCache(identity_client.make_client)

image = ClientCache(image_client.make_client)

volume = ClientCache(volume_client.make_client)

def __init__(self, token=None, url=None, auth_url=None, tenant_name=None,

tenant_id=None, username=None, password=None,

region_name=None, api_version=None):

self._token = token

self._url = url

self._auth_url = auth_url

self._tenant_name = tenant_name

self._tenant_id = tenant_id

self._username = username

self._password = password

self._region_name = region_name

self._api_version = api_version

self._service_catalog = None

if not self._url:

# Populate other password flow attributes

self._token = self.identity.auth_token

self._service_catalog = self.identity.service_catalog

return

def get_endpoint_for_service_type(self, service_type):

"""Return the endpoint URL for the service type."""

# See if we are using password flow auth, i.e. we have a

# service catalog to select endpoints from

if self._service_catalog:

endpoint = self._service_catalog.url_for(

service_type=service_type)

else:

# Hope we were given the correct URL.

endpoint = self._url

return endpoint