text: # Copyright (C) 2011 Nippon Telegraph and Telephone Corporation.
  # Copyright (C) 2011 Isaku Yamahata <yamahata at valinux co jp>
  #
  # 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.
  """
  global flags
  """
  
  from distutils.version import LooseVersion
  
  from ryu import cfg
  
  CONF = cfg.CONF
  
  CONF.register_cli_opts([
      # tests/switch/tester
      cfg.StrOpt('target', default='0000000000000001', help='target sw dp-id'),
      cfg.StrOpt('tester', default='0000000000000002', help='tester sw dp-id'),
      cfg.IntOpt('target_recv_port', default=1,
                 help='target sw receiving port '
                 '(default: 1)'),
      cfg.IntOpt('target_send_port_1', default=2,
                 help='target sw sending port 1 '
                 '(default: 2)'),
      cfg.IntOpt('target_send_port_2', default=3,
                 help='target sw sending port 2  '
                 '(default: 3)'),
      cfg.IntOpt('tester_send_port', default=1,
                 help='tester sw sending port '
                 '(default: 1)'),
      cfg.IntOpt('tester_recv_port_1', default=2,
                 help='tester sw receiving port 1 '
                 '(default: 2)'),
      cfg.IntOpt('tester_recv_port_2', default=3,
                 help='tester sw receiving port 2 '
                 '(default: 3)'),
      cfg.StrOpt('dir', default='ryu/tests/switch/of13',
                 help='test files directory'),
      cfg.StrOpt('target-version', default='openflow13',
                 help='target sw OFP version '
                 '[openflow10|openflow13|openflow14] '
                 '(default: openflow13)'),
      cfg.StrOpt('tester-version', default='openflow13',
                 help='tester sw OFP version '
                 '[openflow10|openflow13|openflow14] '
                 '(default: openflow13)'),
      cfg.IntOpt('interval', default=0,
                 help='interval time in seconds of each test '
                 '(default: 0)'),
  ], group='test-switch')
  
  
  DEFAULT_RPC_PORT = 50002
  DEFAULT_RPC_HOST = '0.0.0.0'
  
  CONF.register_cli_opts([
      cfg.IntOpt('rpc-port', default=DEFAULT_RPC_PORT,
                 help='Port for RPC server (default: %s)' % DEFAULT_RPC_PORT),
      cfg.StrOpt('rpc-host', default=DEFAULT_RPC_HOST,
                 help='IP for RPC server (default: %s)' % DEFAULT_RPC_HOST),
      cfg.StrOpt('config-file', default=None,
                 help='The config file formatted in Python source file. '
                      'Please refer to "bgp_sample_conf.py" for details.')
  ], group='bgp-app')
  
  
  DEFAULT_ZSERV_HOST = '/var/run/quagga/zserv.api'
  DEFAULT_ZSERV_PORT = 2600
  DEFAULT_ZSERV_VERSION = 2  # Version of Ubuntu 16.04 LTS packaged Quagga
  DEFAULT_ZSERV_CLIENT_ROUTE_TYPE = 'BGP'
  DEFAULT_ZSERV_INTERVAL = 10
  DEFAULT_ZSERV_DATABASE = 'sqlite:///zebra.db'
  DEFAULT_ZSERV_ROUTER_ID = '1.1.1.1'
  # For the backward compatibility with Quagga, the default FRRouting version
  # should be None.
  DEFAULT_ZSERV_FRR_VERSION = '0.0'
  
  # Hack: In oslo_config.cfg.Opt, ConfigType might access __class__ attribute
  # for equal comparison, but on Python 2, LooseVersion does not have __class__
  # attribute and it causes AttributeError. So here inject __class__ attribute
  # into LooseVersion class.
  if not hasattr(LooseVersion, '__class__'):
      LooseVersion.__class__ = LooseVersion
  
  CONF.register_cli_opts([
      cfg.StrOpt(
          'server-host', default=DEFAULT_ZSERV_HOST,
          help='Path to Unix Socket or IP address of Zebra server '
               '(default: %s)' % DEFAULT_ZSERV_HOST),
      cfg.IntOpt(
          'server-port', default=DEFAULT_ZSERV_PORT,
          help='Port number of Zebra server '
               '(default: %s)'
          % DEFAULT_ZSERV_PORT),
      cfg.IntOpt(
          'server-version', default=DEFAULT_ZSERV_VERSION,
          help='Zebra protocol version of Zebra server '
               '(default: %s)' % DEFAULT_ZSERV_VERSION),
      cfg.StrOpt(
          'client-route-type', default=DEFAULT_ZSERV_CLIENT_ROUTE_TYPE,
          help='Zebra route type advertised by Zebra client service. '
               '(default: %s)' % DEFAULT_ZSERV_CLIENT_ROUTE_TYPE),
      cfg.IntOpt(
          'retry-interval', default=DEFAULT_ZSERV_INTERVAL,
          help='Retry interval connecting to Zebra server '
               '(default: %s)' % DEFAULT_ZSERV_INTERVAL),
      cfg.StrOpt(
          'db-url', default=DEFAULT_ZSERV_DATABASE,
          help='URL to database used by Zebra protocol service '
               '(default: %s)' % DEFAULT_ZSERV_DATABASE),
      cfg.StrOpt(
          'router-id', default=DEFAULT_ZSERV_ROUTER_ID,
          help='Initial Router ID used by Zebra protocol service '
               '(default: %s)' % DEFAULT_ZSERV_ROUTER_ID),
      cfg.Opt(
          'frr-version', LooseVersion, default=DEFAULT_ZSERV_FRR_VERSION,
          help='FRRouting version when integrated with FRRouting (e.g., 3.0)'),
  ], group='zapi')
  