:param value: SOME STRUCTURE
    :param depth: THE MAX DEPTH OF PROPERTIES, DEEPER WILL BE STRING-IFIED
    :return: FLATTER STRUCTURE

def _deep_json_to_string(value, depth):
    """
    :param value: SOME STRUCTURE
    :param depth: THE MAX DEPTH OF PROPERTIES, DEEPER WILL BE STRING-IFIED
    :return: FLATTER STRUCTURE
    """
    if is_data(value):
        if depth == 0:
            return strings.limit(value2json(value), LOG_STRING_LENGTH)

        return {k: _deep_json_to_string(v, depth - 1) for k, v in value.items()}
    elif is_sequence(value):
        return strings.limit(value2json(value), LOG_STRING_LENGTH)
    elif isinstance(value, number_types):
        return value
    elif is_text(value):
        return strings.limit(value, LOG_STRING_LENGTH)
    elif is_binary(value):
        return strings.limit(bytes2base64(value), LOG_STRING_LENGTH)
    elif isinstance(value, (date, datetime)):
        return datetime2unix(value)
    else:
        return strings.limit(value2json(value), LOG_STRING_LENGTH)