def _send_mail(server_name, last_updated, subject=None):

    current_app.logger.info('Try sending mail')

    try:

        if subject is None:

            subject = '[Ennstatus] %s went offline'

        msg = Message(subject % server_name,

                      sender='ennstatus@enn.lu')

        recipient = current_app.config['SERVER_ADMINS'][server_name]

        msg.add_recipient(recipient)

        body = ('%s went offline. I received the last update at %s'

                % (server_name, last_updated))

        if current_app.extensions['gnupg']:

            body = str(current_app.extensions['gnupg'].encrypt(body, recipient,

                                                           always_trust=True))

        msg.body = body

        mail.send(msg)

    except KeyError:

        current_app.logger.error('Admin for %s not found!' % server_name)

    except AssertionError:

        pass

    except Exception as e:

        current_app.logger.error('Unexpected error: %s' % e,

                                 exc_info=True)

    current_app.logger.info('Finished trying!')

def _check_server(data):

    server_name = data['server_name']

    last_updated = data['last_updated']

    current_status = data['server_status']

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

    date = datetime.strptime(last_updated, '%d-%m-%Y %H:%M:%S')

    now = datetime.utcnow()

    delta = now - date

    if delta.days >= 7:

        os.remove(filename)

        current_app.logger.error('%s was removed!' % server_name)

        return False

    elif current_status == 'Offline':

        return data

    if delta.seconds >= 3600:

        status = 'Offline'

    elif delta.seconds >= 1200:

        status = 'Unknown'

    else:

        status = None

    if status is not None:

        current_app.logger.error('%s is set to %s' % (server_name,

                                 status))

        if (current_status == 'Online' or current_status == 'Unknown') and \

           status == 'Offline':

            _send_mail(server_name, last_updated)

        for key in ('server_status', 'tor_status'):

            data[key] = status

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

            json.dump(data, file_object)

    return data

def _load_single_server(filename):

    current_app.logger.info('Loading {}'.format(filename))

    try:

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

            server = json.load(f)

    except (IOError, ValueError):

        return False

    server = _check_server(server)

    return server