Twisted Python 失败 - Scrapy 问题

【问题标题】：Twisted Python Failure - Scrapy IssuesTwisted Python 失败 - Scrapy 问题
【发布时间】：2015-07-09 06:23:40
【问题描述】：

我正在尝试使用 SCRAPY 为任何搜索查询 - http://www.bewakoof.com 抓取该网站的搜索请求。

网站使用 AJAX（以 XHR 的形式）来显示搜索结果。我设法跟踪 XHR，您在我的代码中注意到它如下（在 for 循环中，其中我将 URL 存储到 temp，并在循环中递增 'i'）-: 

from twisted.internet import reactor
from scrapy.crawler import CrawlerProcess, CrawlerRunner
import scrapy
from scrapy.utils.log import configure_logging
from scrapy.utils.project import get_project_settings
from scrapy.settings import Settings
import datetime
from multiprocessing import Process, Queue
import os
from scrapy.http import Request
from scrapy import signals
from scrapy.xlib.pydispatch import dispatcher
from scrapy.signalmanager import SignalManager
import re

query='shirt'
query1=query.replace(" ", "+")  


class DmozItem(scrapy.Item):

    productname = scrapy.Field()
    product_link = scrapy.Field()
    current_price = scrapy.Field()
    mrp = scrapy.Field()
    offer = scrapy.Field()
    imageurl = scrapy.Field()
    outofstock_status = scrapy.Field()


class DmozSpider(scrapy.Spider):
    name = "dmoz"
    allowed_domains = ["http://www.bewakoof.com"]

    def start_requests(self):

        task_urls = [
        ]
        i=1
        for i in range(1,2):
            temp=( "http://www.bewakoof.com/search/searchload/search_text/" + query + "/page_num/" + str(i) )
            task_urls.append(temp)
            i=i+1

        start_urls = (task_urls)
        p=len(task_urls)
        print 'hi'
        return [ Request(url = start_url) for start_url in start_urls ]
        print 'hi'

    def parse(self, response):
        print 'hi'
        print response
        items = []
        for sel in response.xpath('//html/body/div[@class="main-div-of-product-item"]'):
            item = DmozItem()
            item['productname'] = str(sel.xpath('div[1]/span[@class="lazyImage"]/span[1]/a/img[@id="main_image"]/@title').extract())[17:-6]
            item['product_link'] = "http://www.bewakoof.com"+str(sel.xpath('div[1]/span[@class="lazyImage"]/span[1]/a/img[@id="main_image"]/@href').extract())[3:-2]
            item['current_price']='Rs. ' + str(sel.xpath('div[1]/div[@class="product_info"]/div[@class="product_price_nomrp"]/span[1]/text()').extract())[3:-2]

            item['mrp'] = item['current_price']

            item['offer'] = str('No additional offer available')

            item['imageurl'] = str(sel.xpath('div[1]/span[@class="lazyImage"]/span[1]/a/img[@id="main_image"]/@data-original').extract())[3:-2]
            item['outofstock_status'] = str('In Stock')
            items.append(item)


spider1 = DmozSpider()
settings = Settings()
settings.set("PROJECT", "dmoz")
settings.set("DOWNLOAD_DELAY" , 5)
crawler = CrawlerProcess(settings)
crawler.crawl(spider1)
crawler.start()

现在，当我执行此操作时，出现意外错误-：

2015-07-09 11:46:01 [scrapy] INFO: Scrapy 1.0.0 started (bot: scrapybot)
2015-07-09 11:46:01 [scrapy] INFO: Optional features available: ssl, http11
2015-07-09 11:46:01 [scrapy] INFO: Overridden settings: {'DOWNLOAD_DELAY': 5}
2015-07-09 11:46:02 [scrapy] INFO: Enabled extensions: CloseSpider, TelnetConsole, LogStats, CoreStats, SpiderState
2015-07-09 11:46:02 [scrapy] INFO: Enabled downloader middlewares: HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, DefaultHeadersMiddleware, MetaRefreshMiddleware, HttpCompressionMiddleware, RedirectMiddleware, CookiesMiddleware, ChunkedTransferMiddleware, DownloaderStats
2015-07-09 11:46:02 [scrapy] INFO: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware
2015-07-09 11:46:02 [scrapy] INFO: Enabled item pipelines: 
hi
2015-07-09 11:46:02 [scrapy] INFO: Spider opened
2015-07-09 11:46:02 [scrapy] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2015-07-09 11:46:02 [scrapy] DEBUG: Telnet console listening on 127.0.0.1:6023
2015-07-09 11:46:03 [scrapy] DEBUG: Retrying <GET http://www.bewakoof.com/search/searchload/search_text/shirt/page_num/1> (failed 1 times): [<twisted.python.failure.Failure <class 'twisted.web._newclient.ParseError'>>]
2015-07-09 11:46:09 [scrapy] DEBUG: Retrying <GET http://www.bewakoof.com/search/searchload/search_text/shirt/page_num/1> (failed 2 times): [<twisted.python.failure.Failure <class 'twisted.web._newclient.ParseError'>>]
2015-07-09 11:46:13 [scrapy] DEBUG: Gave up retrying <GET http://www.bewakoof.com/search/searchload/search_text/shirt/page_num/1> (failed 3 times): [<twisted.python.failure.Failure <class 'twisted.web._newclient.ParseError'>>]
2015-07-09 11:46:13 [scrapy] ERROR: Error downloading <GET http://www.bewakoof.com/search/searchload/search_text/shirt/page_num/1>: [<twisted.python.failure.Failure <class 'twisted.web._newclient.ParseError'>>]
2015-07-09 11:46:13 [scrapy] INFO: Closing spider (finished)
2015-07-09 11:46:13 [scrapy] INFO: Dumping Scrapy stats:
{'downloader/exception_count': 3,
 'downloader/exception_type_count/twisted.web._newclient.ResponseFailed': 3,
 'downloader/request_bytes': 780,
 'downloader/request_count': 3,
 'downloader/request_method_count/GET': 3,
 'finish_reason': 'finished',
 'finish_time': datetime.datetime(2015, 7, 9, 6, 16, 13, 793446),
 'log_count/DEBUG': 4,
 'log_count/ERROR': 1,
 'log_count/INFO': 7,
 'scheduler/dequeued': 3,
 'scheduler/dequeued/memory': 3,
 'scheduler/enqueued': 3,
 'scheduler/enqueued/memory': 3,
 'start_time': datetime.datetime(2015, 7, 9, 6, 16, 2, 890066)}
2015-07-09 11:46:13 [scrapy] INFO: Spider closed (finished)

如果您正确地看到我的代码，我还设置了 DOWNLOAD_DELAY=5，但它仍然会给出与我没有保留它时相同的错误。我还增加了 DOWNLOAD_DELAY=10，但它仍然给出相同的错误。我已经在 Stack Overflow 和 GitHub 上阅读了许多与此相关的问题，但似乎都没有帮助。

我在其中一个答案中读到，使用 Polipo 的 TOR 可以提供帮助。但是，我对使用它有点怀疑，因为我不知道使用 TOR 与 Polipo 的组合使用 Scrapy 抓取网站是否合法？ （我不想遇到任何法律问题。）这就是我不喜欢使用它的原因。因此，如果它是合法的，请提供我的特定案例的代码，使用 TOR 和 POLIPO。

或者更确切地说，如果这是非法的，请帮助我解决它而不使用它们。

请帮我解决这些错误！

编辑：

这是我更新的代码-：

from twisted.internet import reactor
from scrapy.crawler import CrawlerProcess, CrawlerRunner
import scrapy
from scrapy.utils.log import configure_logging
from scrapy.utils.project import get_project_settings
from scrapy.settings import Settings
import datetime
from multiprocessing import Process, Queue
import os
from scrapy.http import Request
from scrapy import signals
from scrapy.xlib.pydispatch import dispatcher
from scrapy.signalmanager import SignalManager
import re

query='shirt'
query1=query.replace(" ", "+")  


class DmozItem(scrapy.Item):

    productname = scrapy.Field()
    product_link = scrapy.Field()
    current_price = scrapy.Field()
    mrp = scrapy.Field()
    offer = scrapy.Field()
    imageurl = scrapy.Field()
    outofstock_status = scrapy.Field()




class DmozSpider(scrapy.Spider):
    name = "dmoz"
    allowed_domains = ["http://www.bewakoof.com"]

    def _monkey_patching_HTTPClientParser_statusReceived(self):

        from scrapy.xlib.tx._newclient import HTTPClientParser, ParseError
        old_sr = HTTPClientParser.statusReceived
        def statusReceived(self, status):
            try:
                return old_sr(self, status)
            except ParseError, e:
                if e.args[0] == 'wrong number of parts':
                    return old_sr(self, status + ' OK')
                raise
        statusReceived.__doc__ == old_sr.__doc__
        HTTPClientParser.statusReceived = statusReceived




    def start_requests(self):

        task_urls = [
        ]
        i=1
        for i in range(1,2):
            temp = "http://www.bewakoof.com/search/searchload/search_text/shirt/page_num/1"
            task_urls.append(temp)
            i=i+1

        start_urls = (task_urls)
        p=len(task_urls)
        print 'hi'
        self._monkey_patching_HTTPClientParser_statusReceived()
        return [ Request(url = start_url) for start_url in start_urls ]
        print 'hi'

    def parse(self, response):
        print 'hi'
        print response
        items = []
        for sel in response.xpath('//html/body/div[@class="main-div-of-product-item"]'):
            item = DmozItem()
            item['productname'] = str(sel.xpath('div[1]/span[@class="lazyImage"]/span[1]/a/img[@id="main_image"]/@title').extract())[17:-6]
            item['product_link'] = "http://www.bewakoof.com"+str(sel.xpath('div[1]/span[@class="lazyImage"]/span[1]/a/img[@id="main_image"]/@href').extract())[3:-2]
            item['current_price']='Rs. ' + str(sel.xpath('div[1]/div[@class="product_info"]/div[@class="product_price_nomrp"]/span[1]/text()').extract())[3:-2]

            item['mrp'] = item['current_price']

            item['offer'] = str('No additional offer available')

            item['imageurl'] = str(sel.xpath('div[1]/span[@class="lazyImage"]/span[1]/a/img[@id="main_image"]/@data-original').extract())[3:-2]
            item['outofstock_status'] = str('In Stock')
            items.append(item)

        print (items)

spider1 = DmozSpider()
settings = Settings()
settings.set("PROJECT", "dmoz")
settings.set("DOWNLOAD_DELAY" , 5)
crawler = CrawlerProcess(settings)
crawler.crawl(spider1)
crawler.start()

这是我更新后的输出，显示在终端上-：

2015-07-10 13:06:00 [scrapy] INFO: Scrapy 1.0.0 started (bot: scrapybot)
2015-07-10 13:06:00 [scrapy] INFO: Optional features available: ssl, http11
2015-07-10 13:06:00 [scrapy] INFO: Overridden settings: {'DOWNLOAD_DELAY': 5}
2015-07-10 13:06:01 [scrapy] INFO: Enabled extensions: CloseSpider, TelnetConsole, LogStats, CoreStats, SpiderState
2015-07-10 13:06:01 [scrapy] INFO: Enabled downloader middlewares: HttpAuthMiddleware, DownloadTimeoutMiddleware, UserAgentMiddleware, RetryMiddleware, DefaultHeadersMiddleware, MetaRefreshMiddleware, HttpCompressionMiddleware, RedirectMiddleware, CookiesMiddleware, ChunkedTransferMiddleware, DownloaderStats
2015-07-10 13:06:01 [scrapy] INFO: Enabled spider middlewares: HttpErrorMiddleware, OffsiteMiddleware, RefererMiddleware, UrlLengthMiddleware, DepthMiddleware
2015-07-10 13:06:01 [scrapy] INFO: Enabled item pipelines: 
hi
2015-07-10 13:06:01 [scrapy] INFO: Spider opened
2015-07-10 13:06:01 [scrapy] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2015-07-10 13:06:01 [scrapy] DEBUG: Telnet console listening on 127.0.0.1:6023
2015-07-10 13:06:02 [scrapy] DEBUG: Retrying <GET http://www.bewakoof.com/search/searchload/search_text/shirt/page_num/1> (failed 1 times): [<twisted.python.failure.Failure <class 'twisted.web._newclient.ParseError'>>]
2015-07-10 13:06:08 [scrapy] DEBUG: Retrying <GET http://www.bewakoof.com/search/searchload/search_text/shirt/page_num/1> (failed 2 times): [<twisted.python.failure.Failure <class 'twisted.web._newclient.ParseError'>>]
2015-07-10 13:06:12 [scrapy] DEBUG: Gave up retrying <GET http://www.bewakoof.com/search/searchload/search_text/shirt/page_num/1> (failed 3 times): [<twisted.python.failure.Failure <class 'twisted.web._newclient.ParseError'>>]
2015-07-10 13:06:12 [scrapy] ERROR: Error downloading <GET http://www.bewakoof.com/search/searchload/search_text/shirt/page_num/1>: [<twisted.python.failure.Failure <class 'twisted.web._newclient.ParseError'>>]
2015-07-10 13:06:13 [scrapy] INFO: Closing spider (finished)
2015-07-10 13:06:13 [scrapy] INFO: Dumping Scrapy stats:
{'downloader/exception_count': 3,
 'downloader/exception_type_count/twisted.web._newclient.ResponseFailed': 3,
 'downloader/request_bytes': 780,
 'downloader/request_count': 3,
 'downloader/request_method_count/GET': 3,
 'finish_reason': 'finished',
 'finish_time': datetime.datetime(2015, 7, 10, 7, 36, 13, 11023),
 'log_count/DEBUG': 4,
 'log_count/ERROR': 1,
 'log_count/INFO': 7,
 'scheduler/dequeued': 3,
 'scheduler/dequeued/memory': 3,
 'scheduler/enqueued': 3,
 'scheduler/enqueued/memory': 3,
 'start_time': datetime.datetime(2015, 7, 10, 7, 36, 1, 114912)}
2015-07-10 13:06:13 [scrapy] INFO: Spider closed (finished)

所以，如您所见，错误仍然相同！ :( 。所以，请帮我解决这个问题！

已更新-：

这是当我尝试捕获@JoeLinux 建议执行的异常时的输出-：

>>> try:
...     fetch("http://www.bewakoof.com/search/searchload/search_text/shirt/page_num/1")
... except Exception as e:
...     e
... 
2015-07-10 17:51:13 [scrapy] DEBUG: Retrying <GET http://www.bewakoof.com/search/searchload/search_text/shirt/page_num/1> (failed 1 times): [<twisted.python.failure.Failure <class 'twisted.web._newclient.ParseError'>>]
2015-07-10 17:51:14 [scrapy] DEBUG: Retrying <GET http://www.bewakoof.com/search/searchload/search_text/shirt/page_num/1> (failed 2 times): [<twisted.python.failure.Failure <class 'twisted.web._newclient.ParseError'>>]
2015-07-10 17:51:15 [scrapy] DEBUG: Gave up retrying <GET http://www.bewakoof.com/search/searchload/search_text/shirt/page_num/1> (failed 3 times): [<twisted.python.failure.Failure <class 'twisted.web._newclient.ParseError'>>]
ResponseFailed([<twisted.python.failure.Failure <class 'twisted.web._newclient.ParseError'>>],)
>>> print e.reasons[0].getTraceback()
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/twisted/internet/posixbase.py", line 614, in _doReadOrWrite
    why = selectable.doRead()
  File "/usr/lib/python2.7/dist-packages/twisted/internet/tcp.py", line 214, in doRead
    return self._dataReceived(data)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/tcp.py", line 220, in _dataReceived
    rval = self.protocol.dataReceived(data)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/endpoints.py", line 114, in dataReceived
    return self._wrappedProtocol.dataReceived(data)
--- <exception caught here> ---
  File "/usr/lib/python2.7/dist-packages/twisted/web/_newclient.py", line 1523, in dataReceived
    self._parser.dataReceived(bytes)
  File "/usr/lib/python2.7/dist-packages/twisted/web/_newclient.py", line 382, in dataReceived
    HTTPParser.dataReceived(self, data)
  File "/usr/lib/python2.7/dist-packages/twisted/protocols/basic.py", line 571, in dataReceived
    why = self.lineReceived(line)
  File "/usr/lib/python2.7/dist-packages/twisted/web/_newclient.py", line 271, in lineReceived
    self.statusReceived(line)
  File "/usr/lib/python2.7/dist-packages/twisted/web/_newclient.py", line 409, in statusReceived
    raise ParseError("wrong number of parts", status)
twisted.web._newclient.ParseError: ('wrong number of parts', 'HTTP/1.1 500')

【问题讨论】：

    标签： python web-scraping scrapy twisted scrapy-spider


    【解决方案1】：

    我遇到了同样的错误

    [<twisted.python.failure.Failure twisted.web._newclient.ParseError: (u'wrong number of parts', 'HTTP/1.1 302')>]

    现在它可以工作了。

    我想你可以试试这个：

    • 在方法_monkey_patching_HTTPClientParser_statusReceived中，将from scrapy.xlib.tx._newclient import HTTPClientParser, ParseError改为from twisted.web._newclient import HTTPClientParser, ParseError；

    • 在方法start_requests中，为start_urls中的每个请求调用_monkey_patching_HTTPClientParser_statusReceived，例如： def start_requests(self): for url in self.start_urls: self._monkey_patching_HTTPClientParser_statusReceived() yield Request(url, dont_filter=True)

    希望对你有帮助。

    【讨论】：

      【解决方案2】：

      我能够在scrapy shell 中复制您的情况。这是我在交互式 shell 中收到的错误：

      $ scrapy shell 
...
>>> try:
>>>    fetch("http://www.bewakoof.com/search/searchload/search_text/shirt/page_num/1")
>>> except Exception as e:
>>>    e
2015-07-09 13:53:37-0400 [default] DEBUG: Retrying <GET http://www.bewakoof.com/search/searchload/search_text/shirt/page_num/1> (failed 1 times): [<twisted.python.failure.Failure <class 'twisted.web._newclient.ParseError'>>]
2015-07-09 13:53:38-0400 [default] DEBUG: Retrying <GET http://www.bewakoof.com/search/searchload/search_text/shirt/page_num/1> (failed 2 times): [<twisted.python.failure.Failure <class 'twisted.web._newclient.ParseError'>>]
2015-07-09 13:53:38-0400 [default] DEBUG: Gave up retrying <GET http://www.bewakoof.com/search/searchload/search_text/shirt/page_num/1> (failed 3 times): [<twisted.python.failure.Failure <class 'twisted.web._newclient.ParseError'>>]
>>> print e.reasons[0].getTraceback()
...
twisted.web._newclient.ParseError: ('wrong number of parts', 'HTTP/1.1 500')

      请注意，在我放置... 的地方，有些文本行并不那么重要。最后一行显示“错误的零件数量”。经过一番谷歌搜索，我发现了这个问题：

      Error download page: twisted.python.failure.Failure 'scrapy.xlib.tx._newclient.ParseError'

      最好的建议是monkeypatch。通读线程并试一试。

      【讨论】：

      • 请检查我的问题！我已经编辑了上面的问题！请帮我解决它，因为我仍然无法解决它！ :(
      • 按照我上面的故障排除步骤会得到什么？
      • 在哪一个？我不明白哪些？
      • 我提到的第一个，是为了得到ParseError的具体原因。
      • 不，但既然你没有放那些'...'行，我应该在我的代码中改变什么，我应该把什么放在哪里？请用我的代码详细说明一下！我仍然不明白，什么代码放在哪里。我很抱歉！但是请提供一个代码，如果您可以提供要更改的内容以及我应该将其放在代码中的哪个位置，那就更好了。
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