text: # Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
  #
  # 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 cinderclient.v2 import client as CinderClient
  import glanceclient
  from keystoneauth1 import loading
  from keystoneauth1 import session
  from neutronclient.v2_0 import client as NeutronClient
  from novaclient.client import Client as NovaClient
  import swiftclient
  
  from trove.common import cfg
  from trove.common.clients import normalize_url
  
  CONF = cfg.CONF
  _SESSION = None
  
  
  def get_keystone_session():
      """Get trove service credential auth session."""
      global _SESSION
  
      if not _SESSION:
          loader = loading.get_plugin_loader('password')
          auth = loader.load_from_options(
              username=CONF.service_credentials.username,
              password=CONF.service_credentials.password,
              project_name=CONF.service_credentials.project_name,
              user_domain_name=CONF.service_credentials.user_domain_name,
              project_domain_name=CONF.service_credentials.project_domain_name,
              auth_url=CONF.service_credentials.auth_url)
          _SESSION = session.Session(auth=auth)
  
      return _SESSION
  
  
  def nova_client_trove_admin(context, region_name=None, password=None):
      """
      Returns a nova client object with the trove admin credentials
      :param context: original context from user request
      :type context: trove.common.context.TroveContext
      :return novaclient: novaclient with trove admin credentials
      :rtype: novaclient.client.Client
      """
  
      ks_session = get_keystone_session()
      client = NovaClient(
          CONF.nova_client_version,
          session=ks_session,
          service_type=CONF.nova_compute_service_type,
          region_name=region_name or CONF.service_credentials.region_name,
          insecure=CONF.nova_api_insecure,
          endpoint_type=CONF.nova_compute_endpoint_type)
  
      if CONF.nova_compute_url and CONF.service_credentials.project_id:
          client.client.endpoint_override = "%s/%s/" % (
              normalize_url(CONF.nova_compute_url),
              CONF.service_credentials.project_id)
  
      return client
  
  
  def cinder_client_trove_admin(context, region_name=None):
      """
      Returns a cinder client object with the trove admin credentials
      :param context: original context from user request
      :type context: trove.common.context.TroveContext
      :return cinderclient: cinderclient with trove admin credentials
      """
      ks_session = get_keystone_session()
      client = CinderClient.Client(
          session=ks_session,
          service_type=CONF.cinder_service_type,
          region_name=region_name or CONF.service_credentials.region_name,
          insecure=CONF.cinder_api_insecure,
          endpoint_type=CONF.cinder_endpoint_type)
  
      if CONF.cinder_url and CONF.service_credentials.project_id:
          client.client.management_url = "%s/%s/" % (
              normalize_url(CONF.cinder_url),
              CONF.service_credentials.project_id)
  
      return client
  
  
  def neutron_client_trove_admin(context, region_name=None):
      """
      Returns a neutron client object with the trove admin credentials
      :param context: original context from user request
      :type context: trove.common.context.TroveContext
      :return neutronclient: neutronclient with trove admin credentials
      """
      ks_session = get_keystone_session()
      client = NeutronClient.Client(
          session=ks_session,
          service_type=CONF.neutron_service_type,
          region_name=region_name or CONF.service_credentials.region_name,
          insecure=CONF.neutron_api_insecure,
          endpoint_type=CONF.neutron_endpoint_type)
  
      if CONF.neutron_url:
          client.management_url = CONF.neutron_url
  
      return client
  
  
  def swift_client_trove_admin(context, region_name=None):
      ks_session = get_keystone_session()
      client = swiftclient.Connection(
          session=ks_session,
          insecure=CONF.swift_api_insecure,
          os_options={
              'region_name': region_name or CONF.service_credentials.region_name,
              'service_type': CONF.swift_service_type,
              'endpoint_type': CONF.swift_endpoint_type
          }
      )
  
      return client
  
  
  def glance_client_trove_admin(context, region_name=None):
      ks_session = get_keystone_session()
      client = glanceclient.Client(
          version=CONF.glance_client_version,
          session=ks_session,
          region_name=region_name or CONF.service_credentials.region_name,
          service_type=CONF.glance_service_type,
          interface=CONF.glance_endpoint_type
      )
  
      return client
  