mirror of https://github.com/scrapy/scrapy.git
54 lines
1.3 KiB
Python
54 lines
1.3 KiB
Python
import scrapy
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from scrapy.crawler import CrawlerProcess
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from scrapy.utils.reactor import (
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install_reactor,
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is_asyncio_reactor_installed,
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is_reactor_installed,
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)
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if is_reactor_installed():
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raise RuntimeError(
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"Reactor already installed before is_asyncio_reactor_installed()."
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)
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try:
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is_asyncio_reactor_installed()
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except RuntimeError:
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pass
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else:
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raise RuntimeError("is_asyncio_reactor_installed() did not raise RuntimeError.")
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if is_reactor_installed():
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raise RuntimeError(
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"Reactor already installed after is_asyncio_reactor_installed()."
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)
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install_reactor("twisted.internet.asyncioreactor.AsyncioSelectorReactor")
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if not is_asyncio_reactor_installed():
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raise RuntimeError("Wrong reactor installed after install_reactor().")
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class ReactorCheckExtension:
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def __init__(self):
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if not is_asyncio_reactor_installed():
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raise RuntimeError("ReactorCheckExtension requires the asyncio reactor.")
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class NoRequestsSpider(scrapy.Spider):
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name = "no_request"
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async def start(self):
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return
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yield
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process = CrawlerProcess(
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settings={
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"TWISTED_REACTOR": "twisted.internet.asyncioreactor.AsyncioSelectorReactor",
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"EXTENSIONS": {ReactorCheckExtension: 0},
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}
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)
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process.crawl(NoRequestsSpider)
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process.start()
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