我在蜘蛛内部的某个地方使用了这段代码:
raise scrapy.exceptions.CloseSpider('you_need_to_rerun')
因此,当引发此异常时,最终我的蜘蛛关闭工作,并且我使用此字符串进入控制台统计信息:
'finish_reason': 'you_need_to_rerun',
但是 - 我如何从代码中获取它?因为我想根据此统计数据中的信息再次循环运行 spider,如下所示:
from scrapy.crawler import CrawlerProcess
from scrapy.utils.project import get_project_settings
import spaida.spiders.spaida_spider
import spaida.settings
you_need_to_rerun = True
while you_need_to_rerun:
process = CrawlerProcess(get_project_settings())
process.crawl(spaida.spiders.spaida_spider.SpaidaSpiderSpider)
process.start(stop_after_crawl=False) # the script will block here until the crawling is finished
finish_reason = 'and here I get somehow finish_reason from stats' # <- how??
if finish_reason == 'finished':
print("everything ok, I don't need to rerun this")
you_need_to_rerun = False
我在文档中找到了这个东西,但做不好,"统计数据可以通过 spider_stats 属性访问,这是一个由蜘蛛域名键控的字典 https://doc.scrapy.org/en/latest/topics/stats.html#scrapy.statscollectors.MemoryStatsCollector.spider_stats。
PS:使用process.start()
时,我也会收到错误扭曲.internet.error.ReactorNotRestartable,以及使用process.start(stop_after_crawl=False)
的建议 - 然后蜘蛛只是停止什么都不做,但这是另一个问题......
您需要通过Crawler
对象访问统计信息对象:
process = CrawlerProcess(get_project_settings())
crawler = process.crawlers[0]
reason = crawler.stats.get_value('finish_reason')