如何获得刮擦失败的URL?
我是新手,我知道这是一个了不起的爬虫框架!
在我的项目中,我发送了90,000个请求,但其中一些失败。我将日志级别设置为INFO,我只是可以看到一些统计信息,但没有详细信息。
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)}
有什么方法可以获取更详细的报告吗?例如,显示那些失败的URL。谢谢!
回答:
是的,这是可能的。
- 下面的代码在
failed_urls
基本Spider类中添加了一个列表,并在URL的响应状态为404时将URL附加到该列表中(需要扩展此范围以涵盖其他错误状态)。 - 接下来,我添加了一个将列表连接到单个字符串中的句柄,并在关闭蜘蛛时将其添加到spider的统计信息中。
- 根据你的评论,可以跟踪扭曲的错误,下面的一些答案提供了有关如何处理特定用例的示例。
- 该代码已更新为可与Scrapy 1.8一起使用。所有这一切都要感谢Juliano Mendieta,因为我所做的只是添加他建议的编辑并确认spider是否按预期工作。
from scrapy import Spider, signalsclass 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)
输出示例(请注意,仅当实际抛出异常时才会显示downloader / exception_count *统计信息-我在关闭无线适配器后尝试运行Spider来模拟它们):
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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