How to use the nhentai.logger.logger.log function in nhentai

def __api_suspended_doujinshi_parser(id_):
    if not isinstance(id_, (int,)) and (isinstance(id_, (str,)) and not id_.isdigit()):
        raise Exception('Doujinshi id({0}) is not valid'.format(id_))

    id_ = int(id_)
    logger.log(15, 'Fetching information of doujinshi id {0}'.format(id_))
    doujinshi = dict()
    doujinshi['id'] = id_
    url = '{0}/{1}'.format(constant.DETAIL_URL, id_)
    i = 0
    while 5 > i:
        try:
            response = request('get', url).json()
        except Exception as e:
            i += 1
            if not i < 5:
                logger.critical(str(e))
                exit(1)
            continue
        break

    doujinshi['name'] = response['title']['english']

def _download_callback(self, request, result):
        result, data = result
        if result == 0:
            logger.warning('fatal errors occurred, ignored')
            # exit(1)
        elif result == -1:
            logger.warning('url {} return status code 404'.format(data))
        else:
            logger.log(15, '{0} downloaded successfully'.format(data))

def doujinshi_parser(id_):
    if not isinstance(id_, (int,)) and (isinstance(id_, (str,)) and not id_.isdigit()):
        raise Exception('Doujinshi id({0}) is not valid'.format(id_))

    id_ = int(id_)
    logger.log(15, 'Fetching doujinshi information of id {0}'.format(id_))
    doujinshi = dict()
    doujinshi['id'] = id_
    url = '{0}/{1}/'.format(constant.DETAIL_URL, id_)

    try:
        response = request('get', url)
        if response.status_code in (200, ):
            response = response.content
        else:
            logger.debug('Slow down and retry ({}) ...'.format(id_))
            time.sleep(1)
            return doujinshi_parser(str(id_))

    except Exception as e:
        logger.warn('Error: {}, ignored'.format(str(e)))
        return None

doujinshi.downloader = downloader
            doujinshi.download()
            if options.is_save_download_history:
                with DB() as db:
                    db.add_one(doujinshi.id)

            if not options.is_nohtml and not options.is_cbz:
                generate_html(options.output_dir, doujinshi)
            elif options.is_cbz:
                generate_cbz(options.output_dir, doujinshi, options.rm_origin_dir)

        if options.main_viewer:
            generate_main_html(options.output_dir)

        if not platform.system() == 'Windows':
            logger.log(15, '🍻 All done.')
        else:
            logger.log(15, 'All done.')

    else:
        [doujinshi.show() for doujinshi in doujinshi_list]

if options.is_save_download_history:
                with DB() as db:
                    db.add_one(doujinshi.id)

            if not options.is_nohtml and not options.is_cbz:
                generate_html(options.output_dir, doujinshi)
            elif options.is_cbz:
                generate_cbz(options.output_dir, doujinshi, options.rm_origin_dir)

        if options.main_viewer:
            generate_main_html(options.output_dir)

        if not platform.system() == 'Windows':
            logger.log(15, '🍻 All done.')
        else:
            logger.log(15, 'All done.')

    else:
        [doujinshi.show() for doujinshi in doujinshi_list]

image_html += element.format(FOLDER=folder, IMAGE=image, TITLE=title)
    if image_html == '':
        logger.warning('No index.html found, --gen-main paused.')
        return
    try:
        data = main.format(STYLES=css, SCRIPTS=js, PICTURE=image_html)
        if sys.version_info < (3, 0):
            with open('./main.html', 'w') as f:
                f.write(data)
        else:
            with open('./main.html', 'wb') as f:
                f.write(data.encode('utf-8'))
        shutil.copy(os.path.dirname(__file__)+'/viewer/logo.png', './')
        set_js_database()
        logger.log(
            15, 'Main Viewer has been written to \'{0}main.html\''.format(output_dir))
    except Exception as e:
        logger.warning('Writing Main Viewer failed ({})'.format(str(e)))

name = doujinshi_obj.name
        if sys.version_info < (3, 0):
            name = doujinshi_obj.name.encode('utf-8')
    else:
        name = {'title': 'nHentai HTML Viewer'}

    data = html.format(TITLE=name, IMAGES=image_html, SCRIPTS=js, STYLES=css)
    try:
        if sys.version_info < (3, 0):
            with open(os.path.join(doujinshi_dir, 'index.html'), 'w') as f:
                f.write(data)
        else:
            with open(os.path.join(doujinshi_dir, 'index.html'), 'wb') as f:
                f.write(data.encode('utf-8'))

        logger.log(15, 'HTML Viewer has been written to \'{0}\''.format(os.path.join(doujinshi_dir, 'index.html')))
    except Exception as e:
        logger.warning('Writing HTML Viewer failed ({})'.format(str(e)))