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#! /usr/bin/python

# Copyright 2013 OpenStack Foundation
#
#    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.

import logging
import os
import signal
import socket
import sys

# If ../keystone/__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(__file__),
                                   os.pardir,
                                   os.pardir))
if os.path.exists(os.path.join(possible_topdir,
                               'keystone',
                               '__init__.py')):
    sys.path.insert(0, possible_topdir)


from paste import deploy
import pbr.version

from keystone.openstack.common import gettextutils
# NOTE(dstanek): gettextutils.enable_lazy() must be called before
# gettextutils._() is called to ensure it has the desired lazy lookup
# behavior. This includes cases, like keystone.exceptions, where
# gettextutils._() is called at import time.
gettextutils.enable_lazy()

from keystone.common import dependency
from keystone.common import environment
from keystone.common import sql
from keystone.common import utils
from keystone import config
from keystone.openstack.common.gettextutils import _
from keystone.openstack.common import importutils
from keystone import service


CONF = config.CONF


def create_server(conf, name, host, port):
    app = deploy.loadapp('config:%s' % conf, name=name)
    server = environment.Server(app, host=host, port=port,
                                keepalive=CONF.tcp_keepalive,
                                keepidle=CONF.tcp_keepidle)
    if CONF.ssl.enable:
        server.set_ssl(CONF.ssl.certfile, CONF.ssl.keyfile,
                       CONF.ssl.ca_certs, CONF.ssl.cert_required)
    return name, server


def sigint_handler(signal, frame):
    """Exits at SIGINT signal."""
    logging.debug('SIGINT received, stopping servers.')
    sys.exit(0)


def serve(*servers):
    signal.signal(signal.SIGINT, sigint_handler)

    for name, server in servers:
        try:
            server.start()
        except socket.error:
            logging.exception(_('Failed to start the %(name)s server') % {
                'name': name})
            raise

    # notify calling process we are ready to serve
    if CONF.onready:
        try:
            notifier = importutils.import_module(CONF.onready)
            notifier.notify()
        except ImportError:
            try:
                utils.check_output(CONF.onready.split())
            except Exception:
                logging.exception('Failed to execute onready command')

    for name, server in servers:
        server.wait()


if __name__ == '__main__':
    dev_conf = os.path.join(possible_topdir,
                            'etc',
                            'keystone.conf')
    config_files = None
    if os.path.exists(dev_conf):
        config_files = [dev_conf]

    config.configure()
    sql.initialize()
    config.set_default_for_default_log_levels()

    CONF(project='keystone',
         version=pbr.version.VersionInfo('keystone').version_string(),
         default_config_files=config_files)

    config.setup_logging()

    # Log the options used when starting if we're in debug mode...
    if CONF.debug:
        CONF.log_opt_values(logging.getLogger(CONF.prog), logging.DEBUG)

    paste_config = config.find_paste_config()

    monkeypatch_thread = not CONF.standard_threads
    pydev_debug_url = utils.setup_remote_pydev_debug()
    if pydev_debug_url:
        # in order to work around errors caused by monkey patching we have to
        # set the thread to False.  An explanation is here:
        # http://lists.openstack.org/pipermail/openstack-dev/2012-August/
        # 000794.html
        monkeypatch_thread = False
    environment.use_eventlet(monkeypatch_thread)

    service.load_backends()

    servers = []
    servers.append(create_server(paste_config,
                                 'admin',
                                 CONF.admin_bind_host,
                                 int(CONF.admin_port)))
    servers.append(create_server(paste_config,
                                 'main',
                                 CONF.public_bind_host,
                                 int(CONF.public_port)))

    dependency.resolve_future_dependencies()
    serve(*servers)