Scrapy CrawlSpider 不听拒绝规则

Question

我在 stackowerflow 和其他问答网站上搜索了任何类似问题，但找不到任何适合我的问题的答案。

我写了下面的爬虫来爬取nautilusconcept.com。网站的类别结构太糟糕了。因为它，我必须应用规则，因为它解析所有带有回调的链接。我确定应该使用 parse_item 方法中的 if 语句解析哪个 url。无论如何，蜘蛛不听我的拒绝规则，仍然试图抓取包含 (?brw....) 链接。

这是我的蜘蛛；

from scrapy.contrib.linkextractors import LinkExtractor
from scrapy.contrib.spiders import CrawlSpider, Rule
from scrapy.selector import Selector
from vitrinbot.items import ProductItem
from vitrinbot.base import utils
import hashlib

removeCurrency = utils.removeCurrency
getCurrency = utils.getCurrency

class NautilusSpider(CrawlSpider):
    name = 'nautilus'
    allowed_domains = ['nautilusconcept.com']
    start_urls = ['http://www.nautilusconcept.com/']
    xml_filename = 'nautilus-%d.xml'
    xpaths = {
        'category' :'//tr[@class="KategoriYazdirTabloTr"]//a/text()',
        'title':'//h1[@class="UrunBilgisiUrunAdi"]/text()',
        'price':'//hemenalfiyat/text()',
        'images':'//td[@class="UrunBilgisiUrunResimSlaytTd"]//div/a/@href',
        'description':'//td[@class="UrunBilgisiUrunBilgiIcerikTd"]//*/text()',
        'currency':'//*[@id="UrunBilgisiUrunFiyatiDiv"]/text()',
        'check_page':'//div[@class="ayrinti"]'
    }

    rules = (

        Rule(
            LinkExtractor(allow=('com/[\w_]+',),

                          deny=('asp$',
                                'login\.asp'
                                'hakkimizda\.asp',
                                'musteri_hizmetleri\.asp',
                                'iletisim_formu\.asp',
                                'yardim\.asp',
                                'sepet\.asp',
                                'catinfo\.asp\?brw',
                          ),
            ),
            callback='parse_item',
            follow=True
        ),

    )


    def parse_item(self, response):
        i = ProductItem()
        sl = Selector(response=response)

        if not sl.xpath(self.xpaths['check_page']):
            return i

        i['id'] = hashlib.md5(response.url.encode('utf-8')).hexdigest()
        i['url'] = response.url
        i['category'] = " > ".join(sl.xpath(self.xpaths['category']).extract()[1:-1])
        i['title'] = sl.xpath(self.xpaths['title']).extract()[0].strip()
        i['special_price'] = i['price'] = sl.xpath(self.xpaths['price']).extract()[0].strip().replace(',','.')

        images = []
        for img in sl.xpath(self.xpaths['images']).extract():
            images.append("http://www.nautilusconcept.com/"+img)
        i['images'] = images

        i['description'] = (" ".join(sl.xpath(self.xpaths['description']).extract())).strip()

        i['brand'] = "Nautilus"

        i['expire_timestamp']=i['sizes']=i['colors'] = ''

        i['currency'] = sl.xpath(self.xpaths['currency']).extract()[0].strip()

        return i

这是一段scrapy日志

2014-07-22 17:39:31+0300 [nautilus] DEBUG: Crawled (200) <GET http://www.nautilusconcept.com/catinfo.asp?brw=0&cid=64&direction=&kactane=100&mrk=1&offset=-1&order=&src=&typ=> (referer: http://www.nautilusconcept.com/catinfo.asp?brw=0&cid=64&direction=&kactane=100&mrk=1&offset=&offset=&order=&src=&stock=1)
2014-07-22 17:39:31+0300 [nautilus] DEBUG: Crawled (200) <GET http://www.nautilusconcept.com/catinfo.asp?brw=0&chkBeden=&chkMarka=&chkRenk=&cid=64&direction=1&kactane=100&mrk=1&offset=-1&order=prc&src=&stock=1&typ=> (referer: http://www.nautilusconcept.com/catinfo.asp?brw=0&cid=64&direction=&kactane=100&mrk=1&offset=&offset=&order=&src=&stock=1)
2014-07-22 17:39:32+0300 [nautilus] DEBUG: Crawled (200) <GET http://www.nautilusconcept.com/catinfo.asp?brw=0&chkBeden=&chkMarka=&chkRenk=&cid=64&direction=1&kactane=100&mrk=1&offset=-1&order=name&src=&stock=1&typ=> (referer: http://www.nautilusconcept.com/catinfo.asp?brw=0&cid=64&direction=&kactane=100&mrk=1&offset=&offset=&order=&src=&stock=1)
2014-07-22 17:39:32+0300 [nautilus] DEBUG: Crawled (200) <GET http://www.nautilusconcept.com/catinfo.asp?brw=&chkBeden=&chkMarka=&chkRenk=&cid=64&direction=2&kactane=100&mrk=1&offset=-1&order=prc&src=&stock=1&typ=7> (referer: http://www.nautilusconcept.com/catinfo.asp?brw=&cid=64&direction=1&kactane=100&mrk=1&offset=-1&order=prc&src=&stock=1&typ=7)
2014-07-22 17:39:32+0300 [nautilus] DEBUG: Crawled (200) <GET http://www.nautilusconcept.com/catinfo.asp?brw=&chkBeden=&chkMarka=&chkRenk=&cid=64&direction=2&kactane=100&mrk=1&offset=-1&order=name&src=&stock=1&typ=7> (referer: http://www.nautilusconcept.com/catinfo.asp?brw=&cid=64&direction=1&kactane=100&mrk=1&offset=-1&order=prc&src=&stock=1&typ=7)
2014-07-22 17:39:33+0300 [nautilus] DEBUG: Crawled (200) <GET http://www.nautilusconcept.com/catinfo.asp?brw=0&chkBeden=&chkMarka=&chkRenk=&cid=64&cmp=&direction=1&grp=&kactane=100&model=&mrk=1&offset=-1&order=prc&src=&stock=1&typ=7> (referer: http://www.nautilusconcept.com/catinfo.asp?brw=&cid=64&direction=1&kactane=100&mrk=1&offset=-1&order=prc&src=&stock=1&typ=7)
2014-07-22 17:39:33+0300 [nautilus] DEBUG: Crawled (200) <GET http://www.nautilusconcept.com/catinfo.asp?brw=1&chkBeden=&chkMarka=&chkRenk=&cid=64&cmp=&direction=1&grp=&kactane=100&model=&mrk=1&offset=-1&order=prc&src=&stock=1&typ=7> (referer: http://www.nautilusconcept.com/catinfo.asp?brw=&cid=64&direction=1&kactane=100&mrk=1&offset=-1&order=prc&src=&stock=1&typ=7)
2014-07-22 17:39:33+0300 [nautilus] DEBUG: Crawled (200) <GET http://www.nautilusconcept.com/catinfo.asp?brw=1&cid=64&direction=1&kactane=100&mrk=1&offset=-1&order=name&src=&typ=7> (referer: http://www.nautilusconcept.com/catinfo.asp?brw=1&chkBeden=&chkMarka=&chkRenk=&cid=64&cmp=&direction=1&grp=&kactane=100&model=&mrk=1&offset=-1&order=name&src=&stock=1&typ=7)

Spider 也会抓取正确的页面，但它不能尝试抓取包含 (catinfo.asp?brw...) 的链接

我正在使用 Scrapy==0.24.2 和 python 2.7.6

Answer 1

这是一个规范化的“问题”。默认情况下，LinkExtractor 返回规范化的 URL，但来自 deny 和 allow 的正则表达式在在规范化之前应用。

我建议你使用这些规则：

rules = (

    Rule(
        LinkExtractor(allow=('com/[\w_]+',),

                      deny=('asp$',
                            'login\.asp',
                            'hakkimizda\.asp',
                            'musteri_hizmetleri\.asp',
                            'iletisim_formu\.asp',
                            'yardim\.asp',
                            'sepet\.asp',
                            'catinfo\.asp\?.*brw',
                      ),
        ),
        callback='parse_item',
        follow=True
    ),

)