cosmic_download-AsyncPool待修正

时间：2021-08-31 18:25:57
# !/usr/bin/env python

# -*- coding: utf-8 -*-

# @Time : 2018/11/16 10:02 AM

# @Author : cxa

# @File : cosmic.py

# @Software: PyCharm

# encoding: utf-8

import os

import aiohttp

import hashlib

import base64

from cryptography.fernet import Fernet

import aiofiles

import multiprocessing

import async_timeout

from lxml import html

import asyncio

from aiologger import Logger

import asyncpool

workers = multiprocessing.cpu_count() * 2 + 1

# 开始索引数

start_num = 227002

# 结束索引数

# end_num = 227006

end_num = 250606

key = "X0JxSkg4NFVBQVBPODlUM0VzT1liNnloeWtLcndkSldRT2xURzQ4MEM5RT0="

page_num_xpath = "//p[@class='selectpage']/select[@id='page_number']/option[last()]/@file"

page_id_xpath = "//img[@id='thumbnail']/@src"

def aes_cbc_decrypt(message):

    decrypted_text = Fernet(base64.b64decode(key).decode("utf8")).decrypt(bytes("{}".format(message), encoding="utf8"))

    return decrypted_text.decode("utf8")

# 漫画题目

cosmic_name = "//head//title/text()"

# 漫画id

cosmic_id = "//img[@id='curPic']/@src"

main_url = aes_cbc_decrypt(

    "gAAAAABbNdhqCnxkaJwZ2VL7HUXne_IOic-NsHtE30W-J68oecVmgm0dzO_lLXgTlI7a5_NbUWlkGm7FqLwY81XIBddNWbac4rCgBA9NFAECsNISkhTvdRl4uDSaS6bHY8sbcJJwO13Z")

cosmic_url_gen = (main_url.format(i) for i in range(start_num, end_num + 1))

full_url = aes_cbc_decrypt(

    "gAAAAABbNdk5FLeX55hOiDAXxgCwwYmGrokYvU3Nd1AOYuOE7OdIEcBdAmSG_Q3kOltealBKMOgUBKDuPUJtzFFPwqoxL-FUip"

    "VNQU-JmBW_K5qxgzTQ3IOla_F61Rscy0fJOaN-mEXKPqrakctyDRN7OVm1LARTMhylQELLuBnJgIT4WXilchg=")  # 漫画的总id，序号的id和格式使用(jpg)

sema = asyncio.Semaphore(5)

sem_img = asyncio.Semaphore(50)

async def logging():

    logger = Logger.with_default_handlers(name='cosmic_download')

    return logger

async def get_buff(url, c_name, session, log):

    with async_timeout.timeout(60):

        async with session.get(url) as r:

            buff = await r.read()

            if not len(buff):

                url = url.replace(".jpg", ".png")

                async with session.get(url) as r2:

                    buff = await r2.read()

            await log.info(f"NOW_URL:, {url}")

            await get_img(url, buff, c_name, log)

async def run_img(url, c_name, session, log):

    async with sem_img:

        await get_buff(url, c_name, session, log)

async def get_img(url, buff, c_name, log):

    # 题目那层目录

    filepath = os.path.join(os.getcwd(), "comics_images", c_name)

    # 如果标题太长就转md5，然后单独启动一个text写入内容为标题

    md5name = hashlib.md5(c_name.encode("utf-8")).hexdigest()

    filepath2 = os.path.join(os.getcwd(), "comics_images", md5name)

    id = url.split('/')[-1]

    image_id = os.path.join(filepath, id)

    image_id2 = os.path.join(filepath2, md5name)

    # 题目层目录是否存在

    if not os.path.exists(filepath) and not os.path.exists(filepath2):

        try:

            os.makedirs(filepath)

        except:

            os.makedirs(filepath2)

            image_id = image_id2

            fs = await aiofiles.open(os.path.join(filepath2, "title.txt"), 'w')

            await fs.write(c_name)

    # 文件是否存在

    if not os.path.exists(image_id) and not os.path.exists(image_id2):

        await log.info(f"SAVE_PATH:{image_id}")

        async with aiofiles.open(image_id, 'wb') as f:

            await f.write(buff)

async def fetch(url, session, log, retry_index=0):

    try:

        with async_timeout.timeout(30):

            async with session.get(url, verify_ssl=False) as req:

                res_status = req.status

                if res_status == 200:

                    text = await req.text()

                    root = html.fromstring(text)

                    name = root.xpath(cosmic_name)[0]

                    jpg_id = root.xpath(page_id_xpath)[0].split('/')[-2]

                    max_page = root.xpath(page_num_xpath)[0].split('.')[0]

                    full_url_gen = (full_url.format(jpg_id, i, "jpg") for i in range(1, int(max_page) + 1))

                    tasks = [asyncio.ensure_future(run_img(img_url, name, session, log)) for img_url in full_url_gen]

                    await asyncio.gather(*tasks)

    except Exception as e:

        text = None

    if not text:

        await log.error(f'Retry times: {retry_index + 1}')

        retry_index += 1

        return await fetch(url, session, log, retry_index)

async def bound_fetch(url, session, log):

    async with sema:

        await fetch(url, session, log)

async def run(data):

    log = await logging()

    result_queue = asyncio.Queue()

    await log.info("Start Spider")

    async with asyncpool.AsyncPool(loop, num_workers=10, name="cosmic",

                                   logger=log, worker_co=bound_fetch) as pool:

        async with aiohttp.connector.TCPConnector(limit=100, force_close=True, enable_cleanup_closed=True) as tc:

            async with aiohttp.ClientSession(connector=tc) as session:

                for url in data:

                    await pool.push(url, session, log)

    await result_queue.put(None)

if __name__ == '__main__':

    loop = asyncio.get_event_loop()

    loop.run_until_complete(run(cosmic_url_gen))

    loop.close()

项目地址:https://github.com/muzico425/cosmic_download

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