#!/usr/bin/env python
# Copyright (c) 2010-2012 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 sys
from optparse import OptionParser

from swift.common.manager import Manager, UnknownCommandError, \
    KILL_WAIT, RUN_DIR

USAGE = \
    """%prog <server>[.<config>] [<server>[.<config>] ...] <command> [options]

where:
    <server>  is the name of a swift service e.g. proxy-server.
              The '-server' part of the name may be omitted.
              'all', 'main' and 'rest' are reserved words that represent a
              group of services.
              all: Expands to all swift daemons.
              main: Expands to main swift daemons.
                    (proxy, container, account, object)
              rest: Expands to all remaining background daemons (beyond
                    "main").
                    (updater, replicator, auditor, etc)
    <config>  is an explicit configuration filename without the
              .conf extension. If <config> is specified then <server> should
              refer to a directory containing the configuration file, e.g.:

                  swift-init object.1 start

              will start an object-server using the configuration file
              /etc/swift/object-server/1.conf
    <command> is a command from the list below.

Commands:
""" + '\n'.join(["%16s: %s" % x for x in Manager.list_commands()])


def main():
    parser = OptionParser(USAGE)
    parser.add_option('-v', '--verbose', action="store_true",
                      default=False, help="display verbose output")
    parser.add_option('-w', '--no-wait', action="store_false", dest="wait",
                      default=True, help="won't wait for server to start "
                      "before returning")
    parser.add_option('-o', '--once', action="store_true",
                      default=False, help="only run one pass of daemon")
    # this is a negative option, default is options.daemon = True
    parser.add_option('-n', '--no-daemon', action="store_false", dest="daemon",
                      default=True, help="start server interactively")
    parser.add_option('-g', '--graceful', action="store_true",
                      default=False, help="send SIGHUP to supporting servers")
    parser.add_option('-c', '--config-num', metavar="N", type="int",
                      dest="number", default=0,
                      help="send command to the Nth server only")
    parser.add_option('-k', '--kill-wait', metavar="N", type="int",
                      dest="kill_wait", default=KILL_WAIT,
                      help="wait N seconds for processes to die (default 15)")
    parser.add_option('-r', '--run-dir', type="str",
                      dest="run_dir", default=RUN_DIR,
                      help="alternative directory to store running pid files "
                      "default: %s" % RUN_DIR)
    # Changing behaviour if missing config
    parser.add_option('--strict', dest='strict', action='store_true',
                      help="Return non-zero status code if some config is "
                           "missing. Default mode if all servers are "
                           "explicitly named.")
    # a negative option for strict
    parser.add_option('--non-strict', dest='strict', action='store_false',
                      help="Return zero status code even if some config is "
                           "missing. Default mode if any server is a glob or "
                           "one of aliases `all`, `main` or `rest`.")
    # SIGKILL daemon after kill_wait period
    parser.add_option('--kill-after-timeout', dest='kill_after_timeout',
                      action='store_true',
                      help="Kill daemon and all children after kill-wait "
                           "period.")

    options, args = parser.parse_args()

    if len(args) < 2:
        parser.print_help()
        print('ERROR: specify server(s) and command')
        return 1

    command = args[-1]
    servers = args[:-1]

    # this is just a silly swap for me cause I always try to "start main"
    commands = dict(Manager.list_commands()).keys()
    if command not in commands and servers[0] in commands:
        servers.append(command)
        command = servers.pop(0)

    manager = Manager(servers, run_dir=options.run_dir)
    try:
        status = manager.run_command(command, **options.__dict__)
    except UnknownCommandError:
        parser.print_help()
        print('ERROR: unknown command, %s' % command)
        status = 1

    return 1 if status else 0


if __name__ == "__main__":
    sys.exit(main())