#!/usr/bin/env python

# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# Copyright 2011 OpenStack Foundation
# 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.

"""
Escalator API Server
"""

import os
import sys

import eventlet

from oslo.service import systemd
from oslo.config import cfg
from oslo.log import log as logging
import osprofiler.notifier
import osprofiler.web

from escalator.common import config
from escalator.common import wsgi
from escalator import notifier


# Monkey patch socket, time, select, threads
eventlet.patcher.monkey_patch(all=False, socket=True, time=True,
                              select=True, thread=True, os=True)

# If ../escalator/__init__.py exists, add ../ to Python search path, so that
# it will override what happens to be installed in /usr/(local/)lib/python...
possible_topdir = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
                                   os.pardir,
                                   os.pardir))
if os.path.exists(os.path.join(possible_topdir, 'escalator', '__init__.py')):
    sys.path.insert(0, possible_topdir)


CONF = cfg.CONF
CONF.import_group("profiler", "escalator.common.wsgi")
logging.register_options(CONF)


def fail(e):
    sys.exit(100)


def main():
    try:
        config.parse_args()
        wsgi.set_eventlet_hub()
        logging.setup(CONF, 'escalator')

        if cfg.CONF.profiler.enabled:
            _notifier = osprofiler.notifier.create("Messaging",
                                                   notifier.messaging, {},
                                                   notifier.get_transport(),
                                                   "escalator", "api",
                                                   cfg.CONF.bind_host)
            osprofiler.notifier.set(_notifier)
        else:
            osprofiler.web.disable()

        server = wsgi.Server()
        server.start(config.load_paste_app('escalator-api'), default_port=9393)
        systemd.notify_once()
        server.wait()
    except Exception as e:
        fail(e)


if __name__ == '__main__':
    main()