如何获取scrapy失败的URL? [英] How to get the scrapy failure URLs?

问题描述

我是scrapy的新手，这是我所知道的令人惊叹的爬虫框架！

I'm a newbie of scrapy and it's amazing crawler framework i have known!

在我的项目中，我发送了 90,000 多个请求，但其中一些失败了.我将日志级别设置为 INFO，我只能看到一些统计信息但没有详细信息.

In my project, I sent more than 90, 000 requests, but there are some of them failed. I set the log level to be INFO, and i just can see some statistics but no details.

2012-12-05 21:03:04+0800 [pd_spider] INFO: Dumping spider stats:
{'downloader/exception_count': 1,
 'downloader/exception_type_count/twisted.internet.error.ConnectionDone': 1,
 'downloader/request_bytes': 46282582,
 'downloader/request_count': 92383,
 'downloader/request_method_count/GET': 92383,
 'downloader/response_bytes': 123766459,
 'downloader/response_count': 92382,
 'downloader/response_status_count/200': 92382,
 'finish_reason': 'finished',
 'finish_time': datetime.datetime(2012, 12, 5, 13, 3, 4, 836000),
 'item_scraped_count': 46191,
 'request_depth_max': 1,
 'scheduler/memory_enqueued': 92383,
 'start_time': datetime.datetime(2012, 12, 5, 12, 23, 25, 427000)}

有没有办法获得更详细的报告?例如，显示那些失败的 URL.谢谢！

Is there any way to get more detail report? For example, show those failed URLs. Thanks!

推荐答案

是的，这是可能的.

• 下面的代码将一个 failed_urls 列表添加到一个基本的蜘蛛类中，如果 url 的响应状态是 404，则将 url 附加到它上面(这需要扩展以涵盖其他需要的错误状态).
• 接下来，我添加了一个句柄，将列表连接成一个字符串，并在蜘蛛关闭时将其添加到蜘蛛的统计信息中.
• 根据您的评论，可以跟踪 Twisted 错误，下面的一些答案提供了有关如何处理该特定用例的示例
• 代码已更新以适用于 Scrapy 1.8.所有的感谢都应该归功于 Juliano Mendieta，因为我所做的只是添加他建议的编辑并确认蜘蛛按预期工作.

• The code below adds a failed_urls list to a basic spider class and appends urls to it if the response status of the url is 404 (this would need to be extended to cover other error statuses as required).
• Next I added a handle that joins the list into a single string and adds it to the spider's stats when the spider is closed.
• Based on your comments, it's possible to track Twisted errors, and some of the answers below give examples on how to handle that particular use case
• The code has been updated to work with Scrapy 1.8. All thanks to this should go to Juliano Mendieta, since all I did was simply to add his suggested edits and confirm that the spider worked as intended.

from scrapy import Spider, signals

class MySpider(Spider):
    handle_httpstatus_list = [404] 
    name = "myspider"
    allowed_domains = ["example.com"]
    start_urls = [
        'http://www.example.com/thisurlexists.html',
        'http://www.example.com/thisurldoesnotexist.html',
        'http://www.example.com/neitherdoesthisone.html'
    ]

    def __init__(self, *args, **kwargs):
            super().__init__(*args, **kwargs)
            self.failed_urls = []

    @classmethod
    def from_crawler(cls, crawler, *args, **kwargs):
        spider = super(MySpider, cls).from_crawler(crawler, *args, **kwargs)
        crawler.signals.connect(spider.handle_spider_closed, signals.spider_closed)
        return spider

    def parse(self, response):
        if response.status == 404:
            self.crawler.stats.inc_value('failed_url_count')
            self.failed_urls.append(response.url)

    def handle_spider_closed(self, reason):
        self.crawler.stats.set_value('failed_urls', ', '.join(self.failed_urls))

    def process_exception(self, response, exception, spider):
        ex_class = "%s.%s" % (exception.__class__.__module__, exception.__class__.__name__)
        self.crawler.stats.inc_value('downloader/exception_count', spider=spider)
        self.crawler.stats.inc_value('downloader/exception_type_count/%s' % ex_class, spider=spider)

<小时>

示例输出(请注意，只有在实际抛出异常时才会出现下载器/异常计数* 统计信息 - 我通过在关闭无线适配器后尝试运行蜘蛛来模拟它们):

---

Example output (note that the downloader/exception_count* stats will only appear if exceptions are actually thrown - I simulated them by trying to run the spider after I'd turned off my wireless adapter):

2012-12-10 11:15:26+0000 [myspider] INFO: Dumping Scrapy stats:
    {'downloader/exception_count': 15,
     'downloader/exception_type_count/twisted.internet.error.DNSLookupError': 15,
     'downloader/request_bytes': 717,
     'downloader/request_count': 3,
     'downloader/request_method_count/GET': 3,
     'downloader/response_bytes': 15209,
     'downloader/response_count': 3,
     'downloader/response_status_count/200': 1,
     'downloader/response_status_count/404': 2,
     'failed_url_count': 2,
     'failed_urls': 'http://www.example.com/thisurldoesnotexist.html, http://www.example.com/neitherdoesthisone.html'
     'finish_reason': 'finished',
     'finish_time': datetime.datetime(2012, 12, 10, 11, 15, 26, 874000),
     'log_count/DEBUG': 9,
     'log_count/ERROR': 2,
     'log_count/INFO': 4,
     'response_received_count': 3,
     'scheduler/dequeued': 3,
     'scheduler/dequeued/memory': 3,
     'scheduler/enqueued': 3,
     'scheduler/enqueued/memory': 3,
     'spider_exceptions/NameError': 2,
     'start_time': datetime.datetime(2012, 12, 10, 11, 15, 26, 560000)}

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