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# ruff: noqa: E402
from scrapy.utils.reactor import install_reactor
install_reactor("twisted.internet.asyncioreactor.AsyncioSelectorReactor")
from urllib.parse import urlparse
from twisted.internet import reactor
from twisted.names import cache, resolve
from twisted.names import hosts as hostsModule
from twisted.names.client import Resolver
from twisted.python.runtime import platform
from scrapy import Request, Spider
from scrapy.crawler import CrawlerRunner
from scrapy.utils.httpobj import urlparse_cached
from scrapy.utils.log import configure_logging
from tests.mockserver import MockDNSServer, MockServer
# https://stackoverflow.com/a/32784190
def createResolver(servers=None, resolvconf=None, hosts=None):
if hosts is None:
hosts = b"/etc/hosts" if platform.getType() == "posix" else r"c:\windows\hosts"
theResolver = Resolver(resolvconf, servers)
hostResolver = hostsModule.Resolver(hosts)
chain = [hostResolver, cache.CacheResolver(), theResolver]
return resolve.ResolverChain(chain)
class LocalhostSpider(Spider):
name = "localhost_spider"
async def start(self):
yield Request(self.url)
def parse(self, response):
netloc = urlparse_cached(response).netloc
host = netloc.split(":")[0]
self.logger.info(f"Host: {host}")
self.logger.info(f"Type: {type(response.ip_address)}")
self.logger.info(f"IP address: {response.ip_address}")
if __name__ == "__main__":
with MockServer() as mock_http_server, MockDNSServer() as mock_dns_server:
port = urlparse(mock_http_server.http_address).port
url = f"http://not.a.real.domain:{port}/echo"
servers = [(mock_dns_server.host, mock_dns_server.port)]
reactor.installResolver(createResolver(servers=servers))
configure_logging()
runner = CrawlerRunner()
d = runner.crawl(LocalhostSpider, url=url)
d.addBoth(lambda _: reactor.stop())
reactor.run()
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