Question

我有一只蜘蛛，我必须使用Selenium来抓取页面上的动态数据。这是它的样子：

class MySpider(
    name = 'myspider'
    start_urls = ['http://example.org']

    def __init__(self, *args, **kwargs):
        super(, self).__init__(*args, **kwargs)
        self.driver = webdriver.Firefox()
        self.driver.implicitly_wait(5)
        dispatcher.connect(self.spider_closed, signals.spider_closed)

    def spider_closed(self, spider):
        if self.driver:
            self.driver.quit()
            self.driver = None

这里的问题是，当我取消Scrapyd的工作时，它不会停止，直到我手动关闭窗口。当我将蜘蛛部署到真实服务器时，我显然无法做到这一点。

这是我每次点击时在Scrapyd日志中看到的内容＆＃34;取消＆＃34;：

2015-08-12 13:48:13+0300 [HTTPChannel,208,127.0.0.1] Unhandled Error
    Traceback (most recent call last):
      File "/home/dmitry/.virtualenvs/myproject/local/lib/python2.7/site-packages/twisted/web/http.py", line 1731, in allContentReceived
        req.requestReceived(command, path, version)
      File "/home/dmitry/.virtualenvs/myproject/local/lib/python2.7/site-packages/twisted/web/http.py", line 827, in requestReceived
        self.process()
      File "/home/dmitry/.virtualenvs/myproject/local/lib/python2.7/site-packages/twisted/web/server.py", line 189, in process
        self.render(resrc)
      File "/home/dmitry/.virtualenvs/myproject/local/lib/python2.7/site-packages/twisted/web/server.py", line 238, in render
        body = resrc.render(self)
    --- <exception caught here> ---
      File "/home/dmitry/.virtualenvs/myproject/local/lib/python2.7/site-packages/scrapyd/webservice.py", line 18, in render
        return JsonResource.render(self, txrequest)
      File "/home/dmitry/.virtualenvs/myproject/local/lib/python2.7/site-packages/scrapy/utils/txweb.py", line 10, in render
        r = resource.Resource.render(self, txrequest)
      File "/home/dmitry/.virtualenvs/myproject/local/lib/python2.7/site-packages/twisted/web/resource.py", line 250, in render
        return m(request)
      File "/home/dmitry/.virtualenvs/myproject/local/lib/python2.7/site-packages/scrapyd/webservice.py", line 55, in render_POST
        s.transport.signalProcess(signal)
      File "/home/dmitry/.virtualenvs/myproject/local/lib/python2.7/site-packages/twisted/internet/process.py", line 339, in signalProcess
        raise ProcessExitedAlready()
    twisted.internet.error.ProcessExitedAlready:

但是这份工作仍然在工作清单中，并且标记为＆＃34;正在运行＆＃34;。那么如何关闭驱动程序呢？

Answer 1

导入SignalManager：

from scrapy.signalmanager import SignalManager

然后替换：

dispatcher.connect(self.spider_closed, signals.spider_closed)

使用：

SignalManager(dispatcher.Any).connect(self.spider_closed, signal=signals.spider_closed)

Answer 2

您是否尝试在蜘蛛上实施from_crawler？我只在管道和扩展上完成了这项工作，但对于蜘蛛来说它应该是一样的。

>>> import xml.etree.ElementTree as ET
>>> root = ET.fromstring('''\
... <volume name="sp" type="span" operation="create">
...     <driver>HDD1</driver>
...     <driver>HDD2</driver>
...     <driver>HDD3</driver>
...     <driver>HDD4</driver>
... </volume>
... ''')
>>> for nod in root.findall("./driver"):
...     print ET.tostring(nod)
... 
<driver>HDD1</driver>

<driver>HDD2</driver>

<driver>HDD3</driver>

<driver>HDD4</driver>

http://doc.scrapy.org/en/latest/topics/spiders.html#scrapy.spiders.Spider.from_crawler

蜘蛛关闭时如何戒掉硒司机

2 个答案: