#!/usr/bin/env python
# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright 2011 OpenStack LLC.
# 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.

import gettext
import optparse
import os
import sys


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


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

from reddwarf import version
from reddwarf.common import config
from reddwarf.common import wsgi
from reddwarf.db import db_api


def create_options(parser):
    """Sets up the CLI and config-file options

    :param parser: The option parser
    :returns: None

    """
    parser.add_option('-p', '--port', dest="port", metavar="PORT",
        type=int,
        help="Port the Reddwarf API host listens on. "
             "Default: %default")
    parser.add_option("-f", '--fork', action="store_true", dest="fork")
    parser.add_option('--pid_file', dest="pid_file", default=".pid")
    config.add_common_options(parser)
    config.add_log_options(parser)


def run_server(app, port):
    try:
        server = wsgi.Server()
        server.start(app, int(options.get('port') or conf['bind_port']),
            conf['bind_host'])
        server.wait()
    except RuntimeError as error:
        import traceback
        print traceback.format_exc()
        sys.exit("ERROR: %s" % error)


if __name__ == '__main__':
    oparser = optparse.OptionParser(version="%%prog %s"
                                    % version.version_string())
    create_options(oparser)
    (options, args) = config.parse_options(oparser)
    config.Config.load_paste_config('reddwarf', options, args)
    conf, app = config.Config.load_paste_app('reddwarf', options, args)
    db_api.configure_db(conf)
    port = int(options.get('port') or conf['bind_port'])
    if options['fork']:
        pid = os.fork()
        if pid == 0:
            run_server(app, port)
        else:
            print("Starting server:%s" % pid)
            pid_file = options.get('pid_file', '.pid')
            with open(pid_file, 'w') as f:
                f.write(str(pid))
    else:
        run_server(app, port)