Scrapy爬蟲正在運行，但不遵循任何鏈接。 （Craigslist的）

Question

出於某種原因，我的抓取工具只抓取了幾個域。 它應該至少跟隨起始頁面上的所有網址。 此外，這是在craigslist上，我不確定他們是否以阻止爬蟲而聞名。 知道發生了什么事嗎？

這是輸出：

2012-07-01 15:02:56-0400 [craigslist] INFO: Spider opened
2012-07-01 15:02:56-0400 [craigslist] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2012-07-01 15:02:56-0400 [scrapy] DEBUG: Telnet console listening on 0.0.0.0:6026
2012-07-01 15:02:56-0400 [scrapy] DEBUG: Web service listening on 0.0.0.0:6083
2012-07-01 15:02:57-0400 [craigslist] DEBUG: Crawled (200) <GET http://boston.craigslist.org/search/fua?query=chest+of+drawers> (referer: None)
2012-07-01 15:02:57-0400 [craigslist] DEBUG: Crawled (200) <GET http://boston.craigslist.org/fua/> (referer: None)
2012-07-01 15:02:57-0400 [craigslist] DEBUG: Filtered offsite request to 'boston.craigslist.org': <GET http://boston.craigslist.org/sob/fud/3112540401.html>
2012-07-01 15:02:57-0400 [craigslist] INFO: Closing spider (finished)

這是代碼：

from scrapy.selector import HtmlXPathSelector
from scrapy.contrib.linkextractors.sgml import SgmlLinkExtractor
from scrapy.contrib.spiders import CrawlSpider, Rule
from craigslist.items import CraigslistItem

from scrapy.http import Request

class BostonCragistlistSpider(CrawlSpider):
    name = 'craigslist'
    allowed_domains = ['http://boston.craigslist.org']
    start_urls = ['http://boston.craigslist.org/search/fua?query=chest+of+drawers']

    rules = (
        Rule(SgmlLinkExtractor(allow=r'\/[a-z]{3}\/[a-z]{3}\/.*\.html'), callback='get_image', follow=True),
        # looking for domains like:
        # http://boston.craigslist.org/sob/fud/3111565340.html
        # http://boston.craigslist.org/gbs/fuo/3112103005.html
        Rule(SgmlLinkExtractor(allow=r'\/search\/fua\?query=\.*'), callback='extract_links', follow=True),
    )

    def extract_links(self, response):
        print 'extracting links'
        links = hxs.select('//p[@class="row"]//a/@href').extract()
        for link in links:
            return Request(link, callback=self.get_image)

    def get_image(self, response):
        print 'parsing'
        hxs = HtmlXPathSelector(response)
        images = hxs.select('//img//@src').extract()

任何想法將不勝感激！

Answer 1

allowed_domains需要包含域名，而不是URL。 將其更改為：

allowed_domains = ['boston.craigslist.org']

您可以從日志中看到請求被異地中間件（刪除allowed_domains之外的URL的組件）過濾掉了：

15:02:57-0400 [craigslist] DEBUG: Filtered offsite request to 'boston.craigslist.org': http://boston.craigslist.org/sob/fud/3112540401.html>