CODEWITHSUNDEEP
scrapy
user3136452
user3136452

Reputation:

How to stop the reactor after the run of multiple spiders in the same process on scrapy?

I have several different spiders and want to run all them at once. Based on this and this, I can run multiple spiders in the same process. However, I don't know how to design a signal system to stop the reactor when all spiders are finished.

I have tried:

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

and

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

In both cases, the reactor stops when first crawler closes. Of course, I want that the reactor stops after all spiders are finished.

Could someone show me how to do the trick?

Upvotes: 5

Views: 2657

Answers (1)

user3136452
user3136452

Reputation:

After a sleep night, I have realized I know how to do that. All I need is a counter:

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()

I am assuming Scrapy is not parallel.

I don't know if it is the best way to do that, but it works!

Edit: Updated. See @Jean-Robert comment.

Upvotes: 7

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