重写dupefilter以解决scrapy-redis和scrapy-splash冲突问题

from __future__ import absolute_import
​
from copy import deepcopy
​
from scrapy.utils.request import request_fingerprint
from scrapy.utils.url import canonicalize_url
​
from scrapy_splash.utils import dict_hash
​
from scrapy_redis.dupefilter import RFPDupeFilter
​
​
def splash_request_fingerprint(request, include_headers=None):
    fp = request_fingerprint(request, include_headers=include_headers)
    if 'splash' not in request.meta:
        return fp
​
    splash_options = deepcopy(request.meta['splash'])
    args = splash_options.setdefault('args', {})
​
    if 'url' in args:
        args['url'] = canonicalize_url(args['url'], keep_fragments=True)
​
    return dict_hash(splash_options, fp)
​
​
class SplashAwareDupeFilter(RFPDupeFilter):
​
    def request_fingerprint(self, request):
        return splash_request_fingerprint(request)

​# 在项目目录下新建一个py文件，将上面的代码复制进去，在settings中添加 DUPEFILTER_CLASS = '项目名.xxx.py.SplashAwareDupeFilter' ，并且把scrapy-redis和scrapy-splash的

DUPEFILTER_CLASS删掉，其他设置并不冲突，可以不改。