#!/usr/bin/env python

# Copyright (C) 2012, 2013  SPARTA, Inc. a Parsons Company
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND SPARTA DISCLAIMS ALL WARRANTIES WITH
# REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS.  IN NO EVENT SHALL SPARTA BE LIABLE FOR ANY SPECIAL, DIRECT,
# INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
# LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
# OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
# PERFORMANCE OF THIS SOFTWARE.

__version__ = '$Id$'

import optparse
import logging
import time
import random
import signal
import errno
import atexit
import fcntl
import sys
import os

# configure django ORM
from rpki.gui.script_util import setup
setup()

from rpki.gui.routeview.util import import_routeviews_dump


class BadArgument(Exception):
    pass


def timed_out(*ignored):
    logging.error('timed out')
    sys.exit(1)


if __name__ == '__main__':
    parser = optparse.OptionParser(
        usage='%prog [options] [PATH]',
        description="""This tool is used to import the IPv4/6 BGP table dumps
from routeviews.org into the RPKI Web Portal database.  If the
input file is a bzip2 compressed file, it will be decompressed
automatically.""")
    parser.add_option('-t', '--type', dest='filetype', metavar='TYPE',
                      help='Specify the input file type (text, mrt) [Default: %default]')
    parser.add_option('-l', '--level', dest='log_level', default='ERROR',
                      help='Set logging level [Default: %default]')
    parser.add_option('-b', '--bgpdump', dest='bgpdump', metavar='PROG',
                      help='Specify path to bgdump binary')
    parser.add_option('-j', '--jitter', dest='jitter', type='int',
                      help='Specify upper bound of startup delay, in seconds [Default: %default]')
    parser.add_option('--lockfile', dest='lockfile',
                      help='Set name of lock file; empty string disables locking [Default: %default]')
    parser.add_option('--timeout', dest='timeout', type='int',
                      help='Specify timeout for download and import, in seconds [Default: %default]')
    parser.set_defaults(debug=False, verbose=False, filetype='text', jitter=0,
                        lockfile='/tmp/rpkigui-import-routes.lock', timeout=90*60)
    options, args = parser.parse_args()

    v = getattr(logging, options.log_level.upper())
    logging.basicConfig(level=v)
    atexit.register(logging.shutdown)
    logging.info('logging level set to ' + logging.getLevelName(v))

    if options.bgpdump:
        BGPDUMP = os.path.expanduser(options.bgpdump)

    if options.jitter > 0:
        try:
            delay = random.SystemRandom().randint(0, options.jitter)
        except NotImplementedError:
            delay = random.randint(0, options.jitter)
        logging.info('jitter active, delaying startup for %d seconds', delay)
        time.sleep(delay)

    if options.lockfile:
        try:
            lock = os.open(options.lockfile, os.O_RDONLY | os.O_CREAT | os.O_NONBLOCK, 0666)
            fcntl.flock(lock, fcntl.LOCK_EX | fcntl.LOCK_NB)
        except (IOError, OSError), e:
            if e.errno == errno.EAGAIN:
                logging.info('lock held by another process')
                sys.exit(0)
            else:
                logging.exception(e)
                sys.exit(1)

    try:
        if len(args) > 1:
            raise BadArgument('more than one filename specified')

        if options.timeout > 0:
            signal.signal(signal.SIGALRM, timed_out)
            signal.setitimer(signal.ITIMER_REAL, options.timeout)

        import_routeviews_dump(*args, filetype=options.filetype)

        if options.timeout > 0:
            signal.setitimer(signal.ITIMER_REAL, 0)

    except Exception as e:
        logging.exception(e)
        sys.exit(1)