IP_REGEX = re.compile(IP_REGEX)

PRIVATE_IP_REGEX = (r'(^127\.)|(^192\.168\.)|(^10\.)|(^172\.1[6-9]\.)'

                    r'|(^172\.2[0-9]\.)|(^172\.3[0-1]\.)|'

                    r'255\.255\.255\.255')

PRIVATE_IP_REGEX = re.compile(PRIVATE_IP_REGEX)

DATE_FORMAT = '%d-%m-%Y %H:%M:%S'

gi4 = pygeoip.GeoIP('/usr/share/GeoIP/GeoIP.dat', pygeoip.MEMORY_CACHE)

def check_bridge(key, server):

    if key not in server:

        raise ValueError('%s key not present!\n' % key)

    else:

        if not isinstance(server[key], bool):

            error_message = ('%s has not the right type!'

                             ' Needs to be a boolean!\n') % key

            raise ValueError(error_message)

        for key in ('obfs', 'fteproxy', 'flashproxy', 'meek'):

            check_bridge(key, server)

    if 'ip' in server:

        if IP_REGEX.match(server['ip']) is None:

            raise ValueError('ip is not the right format!\n')

        elif PRIVATE_IP_REGEX.match(server['ip']) is not None:

            raise ValueError('ip is not accepted!\n')

    return True

def update_server(server, ip):

    server['last_updated'] = datetime.utcnow().strftime(DATE_FORMAT)

    server['server_status'] = 'Online'

    server['country'] = gi4.country_name_by_addr(ip)

    server_name = server['server_name']

    if server['server_type'] == 'Bridge':

        if 'ip' in server:

            del server['ip']

    else:

        for key in ('obfs', 'fteproxy', 'flashproxy', 'meek'):

        if 'ip' not in server:

            server['ip'] = ip

    try:

        filename = ''.join(['data/', server_name.lower(), '.json'])

        with open(filename, 'w', encoding='utf-8') as fb:

            json.dump(server, fb)

    except Exception as e:

        return e

    if server['tor_status'] == 'Offline':

        if server_name in mail_cache:

            send_date = mail_cache[server_name]

            now = datetime.utcnow()

            delta = now - send_date

                return server

    elif server_name in mail_cache:

        del mail_cache[server_name]

    return server