#
#    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.

"""Heat API Server.

This implements an approximation of the Amazon CloudFormation API and
translates it into a native representation.  It then calls the heat-engine via
AMQP RPC to implement them.
"""

# flake8: noqa: E402

import eventlet
eventlet.monkey_patch(os=False)
# Monkey patch the original current_thread to use the up-to-date _active
# global variable. See https://bugs.launchpad.net/bugs/1863021 and
# https://github.com/eventlet/eventlet/issues/592
import __original_module_threading as orig_threading
import threading  # noqa
orig_threading.current_thread.__globals__['_active'] = threading._active

import sys

from oslo_config import cfg
import oslo_i18n as i18n
from oslo_log import log as logging
from oslo_reports import guru_meditation_report as gmr
from oslo_service import systemd

from heat.common import config
from heat.common import messaging
from heat.common import profiler
from heat.common import wsgi
from heat import version


i18n.enable_lazy()

CONF = cfg.CONF


def launch_cfn_api(setup_logging=True):
    if setup_logging:
        logging.register_options(CONF)
    CONF(project='heat',
         prog='heat-api-cfn',
         version=version.version_info.version_string())
    if setup_logging:
        logging.setup(CONF, CONF.prog)
        logging.set_defaults()
    LOG = logging.getLogger(CONF.prog)
    config.set_config_defaults()
    messaging.setup()

    app = config.load_paste_app()

    port = CONF.heat_api_cfn.bind_port
    host = CONF.heat_api_cfn.bind_host
    LOG.info('Starting Heat API on %(host)s:%(port)s',
             {'host': host, 'port': port})
    profiler.setup(CONF.prog, host)
    gmr.TextGuruMeditation.setup_autorun(version)
    server = wsgi.Server(CONF.prog, CONF.heat_api_cfn)
    server.start(app, default_port=port)
    return server


def main():
    try:
        server = launch_cfn_api()
        systemd.notify_once()
        server.wait()
    except RuntimeError as e:
        msg = str(e)
        sys.exit("ERROR: %s" % msg)
