294 lines
11 KiB
Python
294 lines
11 KiB
Python
"""
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P站小爬虫 爬每日排行榜
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环境需求：Python3.8+ / Redis
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项目地址：https://github.com/nyaasuki/PixivSpider
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"""
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import re
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import os
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try:
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import requests
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import redis
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except:
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print('检测到缺少必要包！正在尝试安装！.....')
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os.system(r'pip install -r requirements.txt')
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import requests
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import redis
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requests.packages.urllib3.disable_warnings()
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error_list = []
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class PixivSpider(object):
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def __init__(self, db=0):
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self.ajax_url = 'https://www.pixiv.net/ajax/illust/{}/pages' # id
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self.top_url = 'https://www.pixiv.net/ranking.php'
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self.r = redis.Redis(host='localhost', port=6379, db=db, decode_responses=True)
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def get_list(self, pid):
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"""
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获取作品所有页面的URL
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:param pid: 作品ID
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"""
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try:
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# 检查Redis中是否已记录该作品已完全下载
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if self.r.get(f'downloaded:{pid}') == 'complete':
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print(f'作品ID:{pid}已在Redis中标记为完全下载，跳过')
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return None
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# 发送请求获取作品的所有图片信息
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response = requests.get(self.ajax_url.format(pid), headers=self.headers, verify=False)
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json_data = response.json()
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# 检查API返回是否有错误
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if json_data.get('error'):
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print(f'获取作品ID:{pid}失败：{json_data.get("message")}')
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return pid
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# 从返回数据中获取图片列表
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images = json_data.get('body', [])
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if not images:
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print(f'作品ID:{pid}没有图片')
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return pid
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# 获取Redis中已下载的页面记录
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downloaded_redis = set()
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for i in range(len(images)):
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if self.r.get(f'downloaded:{pid}_p{i}') == 'true':
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downloaded_redis.add(i)
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# 检查本地已下载的文件并更新Redis记录
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if os.path.exists('./img'):
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for f in os.listdir('./img'):
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if f.startswith(f'{pid}_p'):
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page = int(re.search(r'_p(\d+)\.', f).group(1))
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if self.r.get(f'downloaded:{pid}_p{page}') != 'true':
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self.r.set(f'downloaded:{pid}_p{page}', 'true')
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print(f'发现本地文件并更新Redis记录：{f}')
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# 使用Redis记录作为唯一来源
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downloaded = downloaded_redis
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# 遍历所有图片进行下载
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for image in images:
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# 检查图片数据格式是否正确
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if 'urls' not in image or 'original' not in image['urls']:
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print(f'作品ID:{pid}的图片数据格式错误')
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continue
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# 获取原图URL和页码信息
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original_url = image['urls']['original']
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page_num = int(re.search(r'_p(\d+)\.', original_url).group(1))
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# 检查是否已下载过该页面（优先使用Redis记录）
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if page_num in downloaded:
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print(f'作品ID:{pid} 第{page_num}页在Redis中已标记为下载，跳过')
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continue
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# 下载图片，如果下载失败返回作品ID以便后续处理
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why_not_do = self.get_img(original_url)
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if why_not_do == 1:
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return pid
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except requests.exceptions.RequestException as e:
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print(f'获取作品ID:{pid}时发生网络错误：{str(e)}')
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return pid
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except Exception as e:
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print(f'处理作品ID:{pid}时发生错误：{str(e)}')
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return pid
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def get_img(self, url):
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"""
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下载单个图片
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:param url: 原图URL，格式如：https://i.pximg.net/img-original/img/2024/12/14/20/00/36/125183562_p0.jpg
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:return: 0表示下载成功，1表示下载失败
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"""
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# 确保下载目录存在
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if not os.path.isdir('./img'):
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os.makedirs('./img')
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# 从URL提取作品ID、页码和文件扩展名
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match = re.search(r'/(\d+)_p(\d+)\.([a-z]+)$', url)
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if not match:
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print(f'无效的URL格式: {url}')
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return 1
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# 解析URL信息并构建文件名
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illust_id, page_num, extension = match.groups()
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file_name = f"{illust_id}_p{page_num}.{extension}"
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# 检查Redis中是否已记录为下载
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if self.r.get(f'downloaded:{illust_id}_p{page_num}') == 'true':
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print(f'Redis记录：{file_name}已下载，跳过')
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return 0
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# 作为备份检查，验证文件是否存在
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if os.path.isfile(f'./img/{file_name}'):
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# 如果文件存在但Redis没有记录，更新Redis记录
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self.r.set(f'downloaded:{illust_id}_p{page_num}', 'true')
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print(f'文件已存在但Redis未记录，已更新Redis：{file_name}')
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return 0
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# 开始下载流程
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print(f'开始下载：{file_name} (第{int(page_num)+1}张)')
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t = 0 # 重试计数器
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# 最多重试3次
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while t < 3:
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try:
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# 下载图片，设置15秒超时
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img_temp = requests.get(url, headers=self.headers, timeout=15, verify=False)
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if img_temp.status_code == 200:
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break
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print(f'下载失败，状态码：{img_temp.status_code}')
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t += 1
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except requests.exceptions.RequestException as e:
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print(f'连接异常：{str(e)}')
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t += 1
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# 如果重试3次都失败，放弃下载
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if t == 3:
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print(f'下载失败次数过多，跳过该图片')
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return 1
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# 将图片内容写入文件
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with open(f'./img/{file_name}', 'wb') as fp:
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fp.write(img_temp.content)
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# 下载成功后在Redis中记录
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self.r.set(f'downloaded:{illust_id}_p{page_num}', 'true')
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# 获取作品总页数并检查是否已下载所有页面
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page_count = self.r.get(f'total_pages:{illust_id}')
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if not page_count:
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# 当前页号+1可能是总页数（保守估计）
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self.r.set(f'total_pages:{illust_id}', str(int(page_num) + 1))
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elif int(page_num) + 1 == int(page_count):
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# 如果当前是最后一页，检查是否所有页面都已下载
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all_downloaded = all(
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self.r.get(f'downloaded:{illust_id}_p{i}') == 'true'
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for i in range(int(page_count))
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)
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if all_downloaded:
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self.r.set(f'downloaded:{illust_id}', 'complete')
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print(f'作品ID:{illust_id}已完全下载')
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print(f'下载完成并已记录到Redis：{file_name}')
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return 0
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def get_top_url(self, num):
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"""
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获取每日排行榜的特定页码数据
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:param num: 页码数（1-10）
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:return: None
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"""
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params = {
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'mode': 'daily',
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'content': 'illust',
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'p': f'{num}',
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'format': 'json'
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}
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response = requests.get(self.top_url, params=params, headers=self.headers, verify=False)
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json_data = response.json()
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self.pixiv_spider_go(json_data['contents'])
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def get_top_pic(self):
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"""
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从排行榜数据中提取作品ID和用户ID
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并将用户ID存入Redis数据库中
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:return: 生成器，返回作品ID
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"""
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for url in self.data:
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illust_id = url['illust_id'] # 获取作品ID
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illust_user = url['user_id'] # 获取用户ID
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yield illust_id # 生成作品ID
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self.r.set(illust_id, illust_user) # 将PID保存到Redis中
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@classmethod
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def pixiv_spider_go(cls, data):
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"""
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存储排行榜数据供后续处理
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:param data: 排行榜JSON数据中的contents部分
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"""
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cls.data = data
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@classmethod
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def pixiv_main(cls):
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"""
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爬虫主函数
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1. 选择Redis数据库
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2. 获取或设置Cookie
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3. 配置请求头
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4. 遍历排行榜页面（1-10页）
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5. 下载每个作品的所有图片
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6. 处理下载失败的作品
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"""
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# 选择Redis数据库
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while True:
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try:
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print("\n可用的Redis数据库:")
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for i in range(6):
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print(f"{i}.DB{i}")
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db_choice = input("\n请选择Redis数据库 (0-5): ")
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db_num = int(db_choice)
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if 0 <= db_num <= 5:
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break
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print("错误：请输入0到5之间的数字")
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except ValueError:
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print("错误：请输入有效的数字")
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global pixiv
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pixiv = PixivSpider(db_num)
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print(f"\n已选择 DB{db_num}")
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# 从Redis获取Cookie，如果没有则要求用户输入
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cookie = pixiv.r.get('cookie')
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if not cookie:
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cookie = input('请输入一个cookie：')
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pixiv.r.set('cookie', cookie)
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# 配置请求头，包含必要的HTTP头部信息
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cls.headers = {
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'accept': 'application/json',
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'accept-language': 'zh-CN,zh;q=0.9,zh-TW;q=0.8,en-US;q=0.7,en;q=0.6',
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'dnt': '1',
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'cookie': f'{cookie}',
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'referer': 'https://www.pixiv.net/',
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'sec-fetch-mode': 'cors',
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'sec-fetch-site': 'same-origin',
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'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.75 Safari/537.36'
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}
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print('开始抓取...')
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# 遍历排行榜前10页
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for i in range(1, 11, 1): # p站每日排行榜最多为500个（50个/页 x 10页）
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pixiv.get_top_url(i) # 获取当前页的排行榜数据
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for j in pixiv.get_top_pic(): # 遍历当前页的所有作品
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k = pixiv.get_list(j) # 下载作品的所有图片
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if k: # 如果下载失败，将作品ID添加到错误列表
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error_list.append(k)
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# 清理下载失败的作品记录
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for k in error_list:
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pixiv.r.delete(k)
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if __name__ == '__main__':
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try:
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print('正在启动Pixiv爬虫...')
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print('确保已安装并启动Redis服务')
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print('确保已准备好有效的Pixiv Cookie')
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# 运行主程序
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PixivSpider.pixiv_main()
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print('爬虫运行完成')
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except redis.exceptions.ConnectionError:
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print('错误：无法连接到Redis服务，请确保Redis服务正在运行')
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except KeyboardInterrupt:
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print('\n用户中断运行')
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except Exception as e:
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print(f'发生错误：{str(e)}')
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