Scrapy工作正常，直到asp网站的第12页，然后500错误

时间：2018-04-14 21:08:13

标签： python scrapy

我的第一个使用Python / Scrapy的抓取项目。网站为http://pabigtrees.com/，每页有78页和20个项目（树）。这是完整的蜘蛛，只需进行一些更改即可提供最小的演示（每页只抓一个值）：

import scrapy
from pabigtrees.items import Tree

class TreesSpider(scrapy.Spider):
  name = "trees"
  start_urls = ["http://pabigtrees.com/view_tree.aspx"]
  allowed_domains = ["pabigtrees.com"]
  download_delay = 2

  def parse(self, response):
    for page in [1,11,12]:
    #for page in range(1,79):
      if page == 1:
        yield scrapy.FormRequest.from_response(
        response,
        #callback=self.parse_page
        callback=self.parse_test
        )
      else:
        yield scrapy.FormRequest.from_response(
          response,
          formdata={
            '__EVENTTARGET': 'ctl00$ContentPlaceHolder1$GridView1',
            '__EVENTARGUMENT': "Page$" + str(page),
            'ctl00$ContentPlaceHolder1$genus_latin': '0',
            'ctl00$ContentPlaceHolder1$genus_common': '0',
            'ctl00$ContentPlaceHolder1$county': '0',
            '__VIEWSTATE': response.css('input#__VIEWSTATE::attr(value)').extract_first(),
            '__VIEWSTATEGENERATOR': response.css('input#__VIEWSTATEGENERATOR::attr(value)').extract_first(),
            '__SCROLLPOSITIONX': response.css('input#__SCROLLPOSITIONX::attr(value)').extract_first(),
            '__SCROLLPOSITIONY': response.css('input#__SCROLLPOSITIONY::attr(value)').extract_first(),
            '__EVENTVALIDATION': response.css('input#__EVENTVALIDATION::attr(value)').extract_first()
          },
          #callback=self.parse_page
          callback=self.parse_test
        )

  def parse_test(self, response):
    yield {
      'county':response.xpath('//a[contains(@href,"Select$1''")]/../../../td[5]/font/text()').extract_first()
    }

  def parse_page(self, response):
    for tree in range(0,20):

      yield scrapy.FormRequest.from_response(
        response,
        formdata={
          '__EVENTTARGET': 'ctl00$ContentPlaceHolder1$GridView1',
          '__EVENTARGUMENT': "Select$" + str(tree)
        },        meta={'county':response.xpath('//a[contains(@href,"Select$'+str(tree)+'")]/../../../td[5]/font/text()').extract_first()}, # save the county from the list page because it is not available on the detail page
        callback=self.parse_results
      )

  def parse_results(self, response):
    item = Tree()
    genus = response.css('span#ctl00_ContentPlaceHolder1_tree_genus::text').extract()
    species = response.css('span#ctl00_ContentPlaceHolder1_tree_species::text').extract()
    circumference = response.css('span#ctl00_ContentPlaceHolder1_lblcircum::text').extract()
    spread = response.css('span#ctl00_ContentPlaceHolder1_lblSpread::text').extract()
    height = response.css('span#ctl00_ContentPlaceHolder1_lblHeight::text').extract()
    points = response.css('span#ctl00_ContentPlaceHolder1_lblPoints::text').extract()
    address = response.css('span#ctl00_ContentPlaceHolder1_lblAddress::text').extract()
    crew = response.xpath('//td[text()="Measuring Crew: "]/following-sibling::td/text()').extract()
    nominator = response.xpath('//td[text()="Original Nominator: "]/following-sibling::td/text()').extract()
    comments = response.xpath('//td[text()="Comments: "]/following-sibling::td/text()').extract()
    gps = response.xpath('//td[text()="GPS Coordinates: "]/following-sibling::td/text()').extract()
    technique = response.css('span#ctl00_ContentPlaceHolder1_lblTech::text').extract()
    yearnominated = response.css('span#ctl00_ContentPlaceHolder1_lblNom::text').extract()
    yearlastmeasured = response.css('span#ctl00_ContentPlaceHolder1_lblMeasured::text').extract()
    item['a_county'] = response.meta['county']
    item['b_genus'] = genus
    item['c_species'] = species
    item['d_circumference'] = circumference
    item['e_spread'] = spread
    item['f_height'] = height
    item['g_points'] = points
    item['h_address'] = address
    item['i_crew'] = crew
    item['j_nominator'] = nominator
    item['k_comments'] = comments
    item['l_gps'] = gps
    item['m_technique'] = technique
    item['n_yearnominated'] = yearnominated
    item['o_yearlastmeasured'] = yearlastmeasured
    return item

爬虫程序在第11页上工作正常。在第12页及以上版本中，我收到500个错误。我相信它与分页有关，但我认为我发送了正确的VIEWSTATE等。这是输出：

(python3) Al-Green:pabigtrees Tony$ scrapy crawl trees -o trees.csv
2018-04-14 15:31:18 [scrapy.utils.log] INFO: Scrapy 1.5.0 started (bot: pabigtrees)
2018-04-14 15:31:18 [scrapy.utils.log] INFO: Versions: lxml 4.2.1.0, libxml2 2.9.8, cssselect 1.0.3, parsel 1.4.0, w3lib 1.19.0, Twisted 17.9.0, Python 3.6.5 (v3.6.5:f59c0932b4, Mar 28 2018, 05:52:31) - [GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)], pyOpenSSL 17.5.0 (OpenSSL 1.1.0h  27 Mar 2018), cryptography 2.2.2, Platform Darwin-17.5.0-x86_64-i386-64bit
2018-04-14 15:31:18 [scrapy.crawler] INFO: Overridden settings: {'BOT_NAME': 'pabigtrees', 'FEED_FORMAT': 'csv', 'FEED_URI': 'trees.csv', 'NEWSPIDER_MODULE': 'pabigtrees.spiders', 'ROBOTSTXT_OBEY': True, 'SPIDER_MODULES': ['pabigtrees.spiders']}
2018-04-14 15:31:18 [scrapy.middleware] INFO: Enabled extensions:
['scrapy.extensions.corestats.CoreStats',
 'scrapy.extensions.telnet.TelnetConsole',
 'scrapy.extensions.memusage.MemoryUsage',
 'scrapy.extensions.feedexport.FeedExporter',
 'scrapy.extensions.logstats.LogStats']
2018-04-14 15:31:18 [scrapy.middleware] INFO: Enabled downloader middlewares:
['scrapy.downloadermiddlewares.robotstxt.RobotsTxtMiddleware',
 'scrapy.downloadermiddlewares.httpauth.HttpAuthMiddleware',
 'scrapy.downloadermiddlewares.downloadtimeout.DownloadTimeoutMiddleware',
 'scrapy.downloadermiddlewares.defaultheaders.DefaultHeadersMiddleware',
 'scrapy.downloadermiddlewares.useragent.UserAgentMiddleware',
 'scrapy.downloadermiddlewares.retry.RetryMiddleware',
 'scrapy.downloadermiddlewares.redirect.MetaRefreshMiddleware',
 'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware',
 'scrapy.downloadermiddlewares.redirect.RedirectMiddleware',
 'scrapy.downloadermiddlewares.cookies.CookiesMiddleware',
 'scrapy.downloadermiddlewares.httpproxy.HttpProxyMiddleware',
 'scrapy.downloadermiddlewares.stats.DownloaderStats']
2018-04-14 15:31:18 [scrapy.middleware] INFO: Enabled spider middlewares:
['scrapy.spidermiddlewares.httperror.HttpErrorMiddleware',
 'scrapy.spidermiddlewares.offsite.OffsiteMiddleware',
 'scrapy.spidermiddlewares.referer.RefererMiddleware',
 'scrapy.spidermiddlewares.urllength.UrlLengthMiddleware',
 'scrapy.spidermiddlewares.depth.DepthMiddleware']
2018-04-14 15:31:18 [scrapy.middleware] INFO: Enabled item pipelines:
[]
2018-04-14 15:31:18 [scrapy.core.engine] INFO: Spider opened
2018-04-14 15:31:18 [scrapy.extensions.logstats] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2018-04-14 15:31:18 [scrapy.extensions.telnet] DEBUG: Telnet console listening on 127.0.0.1:6023
2018-04-14 15:31:26 [scrapy.core.engine] DEBUG: Crawled (404) <GET http://pabigtrees.com/robots.txt> (referer: None)
2018-04-14 15:31:30 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://pabigtrees.com/view_tree.aspx> (referer: None)
2018-04-14 15:31:30 [scrapy.core.engine] DEBUG: Crawled (200) <POST http://pabigtrees.com/view_tree.aspx> (referer: http://pabigtrees.com/view_tree.aspx)
2018-04-14 15:31:30 [scrapy.core.scraper] DEBUG: Scraped from <200 http://pabigtrees.com/view_tree.aspx>
{'county': 'Dauphin'}
2018-04-14 15:31:33 [scrapy.core.engine] DEBUG: Crawled (200) <POST http://pabigtrees.com/view_tree.aspx> (referer: http://pabigtrees.com/view_tree.aspx)
2018-04-14 15:31:33 [scrapy.core.scraper] DEBUG: Scraped from <200 http://pabigtrees.com/view_tree.aspx>
{'county': 'Delaware'}
2018-04-14 15:31:35 [scrapy.downloadermiddlewares.retry] DEBUG: Retrying <POST http://pabigtrees.com/view_tree.aspx> (failed 1 times): 500 Internal Server Error
2018-04-14 15:31:37 [scrapy.downloadermiddlewares.retry] DEBUG: Retrying <POST http://pabigtrees.com/view_tree.aspx> (failed 2 times): 500 Internal Server Error
2018-04-14 15:31:39 [scrapy.downloadermiddlewares.retry] DEBUG: Gave up retrying <POST http://pabigtrees.com/view_tree.aspx> (failed 3 times): 500 Internal Server Error
2018-04-14 15:31:39 [scrapy.core.engine] DEBUG: Crawled (500) <POST http://pabigtrees.com/view_tree.aspx> (referer: http://pabigtrees.com/view_tree.aspx)
2018-04-14 15:31:39 [scrapy.spidermiddlewares.httperror] INFO: Ignoring response <500 http://pabigtrees.com/view_tree.aspx>: HTTP status code is not handled or not allowed
2018-04-14 15:31:39 [scrapy.core.engine] INFO: Closing spider (finished)
2018-04-14 15:31:39 [scrapy.extensions.feedexport] INFO: Stored csv feed (2 items) in: trees.csv
2018-04-14 15:31:39 [scrapy.statscollectors] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 134895,
 'downloader/request_count': 7,
 'downloader/request_method_count/GET': 2,
 'downloader/request_method_count/POST': 5,
 'downloader/response_bytes': 98019,
 'downloader/response_count': 7,
 'downloader/response_status_count/200': 3,
 'downloader/response_status_count/404': 1,
 'downloader/response_status_count/500': 3,
 'finish_reason': 'finished',
 'finish_time': datetime.datetime(2018, 4, 14, 19, 31, 39, 475017),
 'httperror/response_ignored_count': 1,
 'httperror/response_ignored_status_count/500': 1,
 'item_scraped_count': 2,
 'log_count/DEBUG': 11,
 'log_count/INFO': 9,
 'memusage/max': 50180096,
 'memusage/startup': 50176000,
 'request_depth_max': 1,
 'response_received_count': 5,
 'retry/count': 2,
 'retry/max_reached': 1,
 'retry/reason_count/500 Internal Server Error': 2,
 'scheduler/dequeued': 6,
 'scheduler/dequeued/memory': 6,
 'scheduler/enqueued': 6,
 'scheduler/enqueued/memory': 6,
 'start_time': datetime.datetime(2018, 4, 14, 19, 31, 18, 563326)}
2018-04-14 15:31:39 [scrapy.core.engine] INFO: Spider closed (finished)

我很难过，谢谢！

1 个答案:

答案 0 :(得分：0)

__VIEWSTATE确实是导致你麻烦的原因。

如果你看一下你试图抓取的网站的导航，你会发现它只链接到其他10个页面：

navigation

这是您允许从当前页面访问此搜索的唯一10个链接（具有当前视图状态）。接下来的10个可以从搜索的第11页访问。

一种可能的解决方案是检查parse_page()是否在第11页（或21或31 ......），如果是，请创建对接下来10页的请求。< / p>

此外，您只需要填充要更改的formdata，FormRequest.from_response()将处理隐藏输入字段中可用的字段，例如__VIEWSTATE或__EVENTVALIDATION。

相关问题
最新问题