Is it possible to close the spider at spider_opened signal?

Hello,

I’m working on a middleware that loads some resources at spider_opened handler method. If those resources can’t be loaded, I need the spider to be closed.

I tried to do that by raising the CloseSpider exception and also by calling crawler.engine.close_spider(...), but none of them works.

Is there a way to do that?

Thanks!

[wRAR]

@pauloromeira more likely because of the Scrapy version. Anyway, the situation when you can’t stop a thing which is not fully started yet sounds quite common in programming, I don’t know what are the proper solutions.

[AntonGsv]

@wRAR spider:

from scrapy import signals, Spider, Request
from scrapy.exceptions import CloseSpider


class CustomDownloaderMiddleware:
    @classmethod
    def from_crawler(cls, crawler):
        middleware = cls()
        crawler.signals.connect(middleware.spider_opened, signal=signals.spider_opened)
        return middleware

    def spider_opened(self, spider):
        spider.logger.info('before CloseSpider')
        raise CloseSpider("reason")


class CustomSpider(Spider):
    name = 'custom'
    custom_settings = {
        'DOWNLOADER_MIDDLEWARES': {
            ".".join([CustomDownloaderMiddleware.__module__, CustomDownloaderMiddleware.__name__]): 1,
        }
    }

    def start_requests(self):
        yield Request('https://api.myip.com/')

    def parse(self, response, **kwargs):
        self.logger.info(f'{self.__class__.__name__}.parse')

logs:

scrapy crawl custom
2021-04-13 17:46:36 [scrapy.utils.log] INFO: Scrapy 2.5.0 started (bot: scrapybot)
2021-04-13 17:46:36 [scrapy.utils.log] INFO: Versions: lxml 4.6.3.0, libxml2 2.9.5, cssselect 1.1.0, parsel 1.6.0, w3lib 1.22.0, Twisted 21.2.0, Python 3.8.6 (tags/v3.8.6:db45529, Sep 23 2020, 15:52:53) [MSC v.1927 64 bit (AMD64)], pyOpenSSL 20.0.1 (OpenSSL 1.1.1k
 25 Mar 2021), cryptography 3.4.7, Platform Windows-10-10.0.19041-SP0
2021-04-13 17:46:36 [scrapy.utils.log] DEBUG: Using reactor: twisted.internet.selectreactor.SelectReactor
2021-04-13 17:46:36 [scrapy.crawler] INFO: Overridden settings:
{'SPIDER_MODULES': ['app.spiders.test']}
2021-04-13 17:46:36 [scrapy.extensions.telnet] INFO: Telnet Password: eb324b745c4d2fa0
2021-04-13 17:46:36 [scrapy.middleware] INFO: Enabled extensions:
['scrapy.extensions.corestats.CoreStats',
 'scrapy.extensions.telnet.TelnetConsole',
 'scrapy.extensions.logstats.LogStats']
2021-04-13 17:46:37 [scrapy.middleware] INFO: Enabled downloader middlewares:
['app.spiders.test.custom.CustomDownloaderMiddleware',
 'scrapy.downloadermiddlewares.httpauth.HttpAuthMiddleware',
 'scrapy.downloadermiddlewares.downloadtimeout.DownloadTimeoutMiddleware',
 'scrapy.downloadermiddlewares.defaultheaders.DefaultHeadersMiddleware',
 'scrapy.downloadermiddlewares.useragent.UserAgentMiddleware',
 'scrapy.downloadermiddlewares.retry.RetryMiddleware',
 'scrapy.downloadermiddlewares.redirect.MetaRefreshMiddleware',
 'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware',
 'scrapy.downloadermiddlewares.redirect.RedirectMiddleware',
 'scrapy.downloadermiddlewares.cookies.CookiesMiddleware',
 'scrapy.downloadermiddlewares.httpproxy.HttpProxyMiddleware',
 'scrapy.downloadermiddlewares.stats.DownloaderStats']
2021-04-13 17:46:37 [scrapy.middleware] INFO: Enabled spider middlewares:
['scrapy.spidermiddlewares.httperror.HttpErrorMiddleware',
 'scrapy.spidermiddlewares.offsite.OffsiteMiddleware',
 'scrapy.spidermiddlewares.referer.RefererMiddleware',
 'scrapy.spidermiddlewares.urllength.UrlLengthMiddleware',
 'scrapy.spidermiddlewares.depth.DepthMiddleware']
2021-04-13 17:46:37 [scrapy.middleware] INFO: Enabled item pipelines:
[]
2021-04-13 17:46:37 [scrapy.core.engine] INFO: Spider opened
2021-04-13 17:46:37 [scrapy.extensions.logstats] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2021-04-13 17:46:37 [custom] INFO: before CloseSpider
2021-04-13 17:46:37 [scrapy.utils.signal] ERROR: Error caught on signal handler: <bound method CustomDownloaderMiddleware.spider_opened of <app.spiders.test.custom.CustomDownloaderMiddleware object at 0x0000029DA879C7F0>>
Traceback (most recent call last):
  File "d:\host\www\shelf-conscious-python-scrapers\src\.venv\lib\site-packages\scrapy\utils\defer.py", line 157, in maybeDeferred_coro
    result = f(*args, **kw)
  File "d:\host\www\shelf-conscious-python-scrapers\src\.venv\lib\site-packages\pydispatch\robustapply.py", line 55, in robustApply
    return receiver(*arguments, **named)
  File "D:\host\www\shelf-conscious-python-scrapers\src\app\spiders\test\custom.py", line 14, in spider_opened
    raise CloseSpider("reason")
scrapy.exceptions.CloseSpider
2021-04-13 17:46:37 [scrapy.extensions.telnet] INFO: Telnet console listening on 127.0.0.1:6023
2021-04-13 17:46:37 [scrapy.core.engine] DEBUG: Crawled (200) <GET https://api.myip.com/> (referer: None)
2021-04-13 17:46:37 [custom] INFO: CustomSpider.parse
2021-04-13 17:46:37 [scrapy.core.engine] INFO: Closing spider (finished)
2021-04-13 17:46:37 [scrapy.statscollectors] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 212,
 'downloader/request_count': 1,
 'downloader/request_method_count/GET': 1,
 'downloader/response_bytes': 1215,
 'downloader/response_count': 1,
 'downloader/response_status_count/200': 1,
 'elapsed_time_seconds': 0.717408,
 'finish_reason': 'finished',
 'finish_time': datetime.datetime(2021, 4, 13, 14, 46, 37, 751142),
 'httpcompression/response_bytes': 52,
 'httpcompression/response_count': 1,
 'log_count/DEBUG': 1,
 'log_count/ERROR': 1,
 'log_count/INFO': 12,
 'response_received_count': 1,
 'scheduler/dequeued': 1,
 'scheduler/dequeued/memory': 1,
 'scheduler/enqueued': 1,
 'scheduler/enqueued/memory': 1,
 'start_time': datetime.datetime(2021, 4, 13, 14, 46, 37, 33734)}
2021-04-13 17:46:37 [scrapy.core.engine] INFO: Spider closed (finished)