如何在scrapy的同一过程中运行多个蜘蛛后停止反应堆？

Question

我有几种不同的蜘蛛,想要立刻运行它们.基于此和此,我可以在同一个过程中运行多个蜘蛛.但是,我不知道如何设计一个信号系统,以便在所有蜘蛛完成后停止反应堆.

我试过了:

crawler.signals.connect(reactor.stop, signal=signals.spider_closed)

和

crawler.signals.connect(reactor.stop, signal=signals.spider_idle)

在这两种情况下,当第一个履带关闭时,反应器停止.当然,我希望在所有蜘蛛完成后反应堆停止.

有人能告诉我如何做到这一点吗？

Answer 1

睡了一夜后,我意识到我知道该怎么做.我只需要一个柜台:

from twisted.internet import reactor
from scrapy.crawler import Crawler
from scrapy import log, signals
from scrapy.utils.project import get_project_settings

class ReactorControl:

    def __init__(self):
        self.crawlers_running = 0

    def add_crawler(self):
        self.crawlers_running += 1

    def remove_crawler(self):
        self.crawlers_running -= 1
        if self.crawlers_running == 0 :
            reactor.stop()

def setup_crawler(spider_name):
    crawler = Crawler(settings)
    crawler.configure()
    crawler.signals.connect(reactor_control.remove_crawler, signal=signals.spider_closed)
    spider = crawler.spiders.create(spider_name)
    crawler.crawl(spider)
    reactor_control.add_crawler()
    crawler.start()

reactor_control = ReactorControl()
log.start()
settings = get_project_settings()
crawler = Crawler(settings)

for spider_name in crawler.spiders.list():
    setup_crawler(spider_name)

reactor.run()

我假设Scrapy不平行.

我不知道这是否是最佳方式,但它确实有效!

编辑:已更新.见@ Jean-Robert评论.