Checks if Monero daemon is up to date by comparing height to other nodes

monerodaemonchk.py

import logging
from monero.daemon import Daemon
from monero.backends.jsonrpc import JSONRPCDaemon
import operator
import re
import sys

MY_DAEMON = '127.0.0.1:18081'
OTHER_DAEMONS = [
    'node.moneroworld.com:18089',
    'node.xmr.to:18081',
    'node.supportxmr.com:18081'
]
ACCEPTED_HEIGHT_DIFF = 3

_log = logging.getLogger(__name__)

def url_data(url):
    gs = re.compile(
        r'^(?P<host>[^:\s]+)(?::(?P<port>[0-9]+))?$'
        ).match(url).groupdict()
    return dict(filter(operator.itemgetter(1), gs.items()))

def get_height(daemon_url):
    daemon = Daemon(JSONRPCDaemon(**url_data(daemon_url)))
    info = daemon.info()
    return info['height']

if __name__ == '__main__':
    my_height = get_height(MY_DAEMON)
    heights = set()
    for durl in OTHER_DAEMONS:
        try:
            heights.add(get_height(durl))
        except Exception as e:
            _log.exception('Failed to connect to {}'.format(durl))
    if not heights:
        _log.errot('No height determined (all daemons failed?)')
        sys.exit(0)     # the problem is not with MY_DAEMON
    height_diff = my_height - max(heights)
    if abs(height_diff) <= ACCEPTED_HEIGHT_DIFF:
        _log.debug('Height diff within the limit (|{}| <= {})'.format(
                    height_diff, ACCEPTED_HEIGHT_DIFF))
        sys.exit(0)
    _log.warning('Height diff over limit ({}). Returning code 1.'.format(height_diff))
    sys.exit(1)