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# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# Copyright 2011 Justin Santa Barbara
# All Rights Reserved.
#
#    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.

# NOTE(markmc): this is imported before monkey patching in nova.cmd
# so we avoid extra imports here

import sys


def enabled():
    return ('--remote_debug-host' in sys.argv and
            '--remote_debug-port' in sys.argv)


def register_cli_opts():
    from oslo.config import cfg

    cli_opts = [
        cfg.StrOpt('host',
                    help='Debug host (IP or name) to connect. Note '
                        'that using the remote debug option changes how '
                        'Nova uses the eventlet library to support async IO. '
                        'This could result in failures that do not occur '
                        'under normal operation. Use at your own risk.'),

        cfg.IntOpt('port',
                    help='Debug port to connect. Note '
                        'that using the remote debug option changes how '
                        'Nova uses the eventlet library to support async IO. '
                        'This could result in failures that do not occur '
                        'under normal operation. Use at your own risk.')

    ]

    cfg.CONF.register_cli_opts(cli_opts, 'remote_debug')


def init():
    from oslo.config import cfg
    CONF = cfg.CONF

    # NOTE(markmc): gracefully handle the CLI options not being registered
    if 'remote_debug' not in CONF:
        return

    if not (CONF.remote_debug.host and CONF.remote_debug.port):
        return

    from nova.openstack.common.gettextutils import _
    from nova.openstack.common import log as logging
    LOG = logging.getLogger(__name__)

    LOG.debug(_('Listening on %(host)s:%(port)s for debug connection'),
              {'host': CONF.remote_debug.host,
               'port': CONF.remote_debug.port})

    from pydev import pydevd
    pydevd.settrace(host=CONF.remote_debug.host,
                    port=CONF.remote_debug.port,
                    stdoutToServer=False,
                    stderrToServer=False)

    LOG.warn(_('WARNING: Using the remote debug option changes how '
               'Nova uses the eventlet library to support async IO. This '
               'could result in failures that do not occur under normal '
               'operation. Use at your own risk.'))