#!/usr/bin/env python
# pylint: disable-msg=C0103
# vim: tabstop=4 shiftwidth=4 softtabstop=4

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

"""Starter script for Nova API."""

import gettext
import os
import sys

# If ../nova/__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, 'nova', '__init__.py')):
    sys.path.insert(0, possible_topdir)

gettext.install('nova', unicode=1)

from nova import flags
from nova import log as logging
from nova import version
from nova import wsgi

logging.basicConfig()
LOG = logging.getLogger('nova.api')
LOG.setLevel(logging.DEBUG)

FLAGS = flags.FLAGS

API_ENDPOINTS = ['ec2', 'osapi']


def run_app(paste_config_file):
    LOG.debug(_("Using paste.deploy config at: %s"), paste_config_file)
    apps = []
    for api in API_ENDPOINTS:
        config = wsgi.load_paste_configuration(paste_config_file, api)
        if config is None:
            LOG.debug(_("No paste configuration for app: %s"), api)
            continue
        LOG.debug(_("App Config: %(api)s\n%(config)r") % locals())
        wsgi.paste_config_to_flags(config, {
            "verbose": FLAGS.verbose,
            "%s_host" % api: config.get('host', '0.0.0.0'),
            "%s_port" % api: getattr(FLAGS, "%s_port" % api)})
        LOG.info(_("Running %s API"), api)
        app = wsgi.load_paste_app(paste_config_file, api)
        apps.append((app, getattr(FLAGS, "%s_port" % api),
                     getattr(FLAGS, "%s_host" % api)))
    if len(apps) == 0:
        LOG.error(_("No known API applications configured in %s."),
                  paste_config_file)
        return

    # NOTE(todd): redo logging config, verbose could be set in paste config
    logging.basicConfig()
    server = wsgi.Server()
    for app in apps:
        server.start(*app)
    server.wait()


if __name__ == '__main__':
    FLAGS(sys.argv)
    LOG.audit(_("Starting nova-api node (version %s)"),
              version.version_string_with_vcs())
    conf = wsgi.paste_config_file('nova-api.conf')
    if conf:
        run_app(conf)
    else:
        LOG.error(_("No paste configuration found for: %s"), 'nova-api.conf')
