# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
# Copyright 2012 Red Hat, Inc.
# Copyright 2013 NTT corp.
#
#    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.

"""Command-line flag library.

Emulates gflags by wrapping cfg.ConfigOpts.

The idea is to move fully to cfg eventually, and this wrapper is a
stepping stone.

"""

import socket

from oslo_config import cfg
from oslo_log import log as logging
from oslo_middleware import cors
from oslo_policy import opts as policy_opts
from oslo_utils import netutils


CONF = cfg.CONF
logging.register_options(CONF)

core_opts = [
    cfg.StrOpt('state_path',
               default='/var/lib/cinder',
               help="Top-level directory for maintaining cinder's state"), ]

CONF.register_cli_opts(core_opts)

api_opts = [
    cfg.BoolOpt('api_rate_limit',
                default=True,
                help='Enables or disables rate limit of the API.'),
    cfg.StrOpt('group_api_class',
               default='cinder.group.api.API',
               help='The full class name of the group API class'),
    cfg.ListOpt('osapi_volume_ext_list',
                default=[],
                help='Specify list of extensions to load when using osapi_'
                     'volume_extension option with cinder.api.contrib.'
                     'select_extensions'),
    cfg.MultiStrOpt('osapi_volume_extension',
                    default=['cinder.api.contrib.standard_extensions'],
                    help='osapi volume extension to load'),
    cfg.StrOpt('volume_api_class',
               default='cinder.volume.api.API',
               help='The full class name of the volume API class to use'),
]

global_opts = [
    cfg.HostAddressOpt('my_ip',
                       sample_default='<HOST_IP_ADDRESS>',
                       default=netutils.get_my_ipv4(),
                       help='IP address of this host'),
    cfg.StrOpt('volume_manager',
               default='cinder.volume.manager.VolumeManager',
               help='Full class name for the Manager for volume'),
    cfg.StrOpt('scheduler_manager',
               default='cinder.scheduler.manager.SchedulerManager',
               help='Full class name for the Manager for scheduler'),
    cfg.StrOpt('host',
               sample_default='localhost',
               default=socket.gethostname(),
               help='Name of this node.  This can be an opaque '
                    'identifier. It is not necessarily a host name, '
                    'FQDN, or IP address.'),
    # NOTE(vish): default to nova for compatibility with nova installs
    cfg.StrOpt('storage_availability_zone',
               default='nova',
               help='Availability zone of this node. Can be overridden per '
                    'volume backend with the option '
                    '"backend_availability_zone".'),
    cfg.StrOpt('default_availability_zone',
               help='Default availability zone for new volumes. If not set, '
                    'the storage_availability_zone option value is used as '
                    'the default for new volumes.'),
    cfg.BoolOpt('allow_availability_zone_fallback',
                default=False,
                help='If the requested Cinder availability zone is '
                     'unavailable, fall back to the value of '
                     'default_availability_zone, then '
                     'storage_availability_zone, instead of failing.'),
    cfg.StrOpt('default_volume_type',
               default='__DEFAULT__',
               required=True,
               help='Default volume type to use'),
    cfg.StrOpt('default_group_type',
               help='Default group type to use'),
    cfg.StrOpt('volume_usage_audit_period',
               default='month',
               help='Time period for which to generate volume usages. '
                    'The options are hour, day, month, or year.'),
    cfg.StrOpt('rootwrap_config',
               default='/etc/cinder/rootwrap.conf',
               help='Path to the rootwrap configuration file to use for '
                    'running commands as root'),
    cfg.BoolOpt('monkey_patch',
                default=False,
                help='Enable monkey patching'),
    cfg.ListOpt('monkey_patch_modules',
                default=[],
                help='List of modules/decorators to monkey patch'),
    cfg.IntOpt('service_down_time',
               default=60,
               help='Maximum time since last check-in for a service to be '
                    'considered up'),
    cfg.ListOpt('enabled_backends',
                help='A list of backend names to use. These backend names '
                     'should be backed by a unique [CONFIG] group '
                     'with its options'),
    cfg.BoolOpt('no_snapshot_gb_quota',
                default=False,
                help="Whether snapshots sizes count against global and per "
                     "volume type gigabyte quotas. By default snapshots' "
                     "sizes are counted."),
    cfg.StrOpt('transfer_api_class',
               default='cinder.transfer.api.API',
               help='The full class name of the volume transfer API class'),
    cfg.StrOpt('consistencygroup_api_class',
               default='cinder.consistencygroup.api.API',
               help='The full class name of the consistencygroup API class'),
    cfg.BoolOpt('split_loggers',
                default=False,
                help='Log requests to multiple loggers.')
]

auth_opts = [
    cfg.StrOpt('auth_strategy',
               default='keystone',
               choices=[('noauth', 'Do not perform authentication'),
                        ('noauth_include_project_id',
                         'Do not perform authentication, and include a'
                         ' project_id in API URLs'),
                        ('keystone', 'Authenticate using keystone')],
               help='The strategy to use for auth. Supports noauth,'
                    ' noauth_include_project_id or keystone.'),
]

backup_opts = [
    cfg.StrOpt('backup_api_class',
               default='cinder.backup.api.API',
               help='The full class name of the volume backup API class'),
    cfg.StrOpt('backup_manager',
               default='cinder.backup.manager.BackupManager',
               help='Full class name for the Manager for volume backup'),
]

image_opts = [
    cfg.ListOpt('glance_api_servers',
                default=None,
                help='A list of the URLs of glance API servers available to '
                     'cinder ([http[s]://][hostname|ip]:port). If protocol '
                     'is not specified it defaults to http.'),
    cfg.IntOpt('glance_num_retries',
               min=0,
               default=3,
               help='Number retries when downloading an image from glance'),
    cfg.BoolOpt('glance_api_insecure',
                default=False,
                help='Allow to perform insecure SSL (https) requests to '
                     'glance (https will be used but cert validation will '
                     'not be performed).'),
    cfg.BoolOpt('glance_api_ssl_compression',
                default=False,
                help='Enables or disables negotiation of SSL layer '
                     'compression. In some cases disabling compression '
                     'can improve data throughput, such as when high '
                     'network bandwidth is available and you use '
                     'compressed image formats like qcow2.'),
    cfg.StrOpt('glance_ca_certificates_file',
               help='Location of ca certificates file to use for glance '
                    'client requests.'),
    cfg.StrOpt('glance_certfile',
               help='Location of certificate file to use for glance '
                    'client requests.'),
    cfg.StrOpt('glance_keyfile',
               help='Location of certificate key file to use for glance '
                    'client requests.'),
    cfg.IntOpt('glance_request_timeout',
               help='http/https timeout value for glance operations. If no '
                    'value (None) is supplied here, the glanceclient default '
                    'value is used.'),
]

compression_opts = [
    cfg.StrOpt('compression_format',
               default='gzip',
               choices=[('gzip', 'GNUzip format')],
               help='Image compression format on image upload'),
    cfg.BoolOpt('allow_compression_on_image_upload',
                default=False,
                help='The strategy to use for image compression on upload. '
                     'Default is disallow compression.'),
]

CONF.register_opts(api_opts)
CONF.register_opts(core_opts)
CONF.register_opts(auth_opts)
CONF.register_opts(backup_opts)
CONF.register_opts(image_opts)
CONF.register_opts(global_opts)
CONF.register_opts(compression_opts)


def set_middleware_defaults():
    """Update default configuration options for oslo.middleware."""

    cors.set_defaults(
        allow_headers=['X-Auth-Token',
                       'X-Identity-Status',
                       'X-Roles',
                       'X-Service-Catalog',
                       'X-User-Id',
                       'X-Tenant-Id',
                       'X-OpenStack-Request-ID',
                       'X-Trace-Info',
                       'X-Trace-HMAC',
                       'OpenStack-API-Version'],
        expose_headers=['X-Auth-Token',
                        'X-Subject-Token',
                        'X-Service-Token',
                        'X-OpenStack-Request-ID',
                        'OpenStack-API-Version'],
        allow_methods=['GET',
                       'PUT',
                       'POST',
                       'DELETE',
                       'PATCH',
                       'HEAD']
    )


def set_external_library_defaults():
    """Set default configuration options for external openstack libraries."""
    # This function is required so that our settings will override the defaults
    # set by the libraries when the Cinder config files are generated.  This
    # function is declared as an entry point for oslo.config.opts.defaults in
    # setup.cfg.

    set_middleware_defaults()
    policy_opts.set_defaults(CONF,
                             enforce_scope=False,
                             enforce_new_defaults=False)
