mirror of https://github.com/scrapy/scrapy.git
98 lines
3.0 KiB
Python
98 lines
3.0 KiB
Python
"""
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Scrapy Shell
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See documentation in docs/topics/shell.rst
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"""
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from argparse import Namespace
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from threading import Thread
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from typing import List, Type
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from scrapy import Spider
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from scrapy.commands import ScrapyCommand
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from scrapy.http import Request
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from scrapy.shell import Shell
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from scrapy.utils.spider import DefaultSpider, spidercls_for_request
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from scrapy.utils.url import guess_scheme
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class Command(ScrapyCommand):
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requires_project = False
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default_settings = {
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"KEEP_ALIVE": True,
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"LOGSTATS_INTERVAL": 0,
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"DUPEFILTER_CLASS": "scrapy.dupefilters.BaseDupeFilter",
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}
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def syntax(self):
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return "[url|file]"
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def short_desc(self):
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return "Interactive scraping console"
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def long_desc(self):
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return (
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"Interactive console for scraping the given url or file. "
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"Use ./file.html syntax or full path for local file."
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)
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def add_options(self, parser):
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ScrapyCommand.add_options(self, parser)
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parser.add_argument(
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"-c",
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dest="code",
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help="evaluate the code in the shell, print the result and exit",
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)
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parser.add_argument("--spider", dest="spider", help="use this spider")
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parser.add_argument(
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"--no-redirect",
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dest="no_redirect",
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action="store_true",
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default=False,
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help="do not handle HTTP 3xx status codes and print response as-is",
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)
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def update_vars(self, vars):
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"""You can use this function to update the Scrapy objects that will be
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available in the shell
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"""
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pass
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def run(self, args: List[str], opts: Namespace) -> None:
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url = args[0] if args else None
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if url:
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# first argument may be a local file
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url = guess_scheme(url)
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assert self.crawler_process
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spider_loader = self.crawler_process.spider_loader
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spidercls: Type[Spider] = DefaultSpider
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if opts.spider:
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spidercls = spider_loader.load(opts.spider)
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elif url:
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spidercls = spidercls_for_request(
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spider_loader, Request(url), spidercls, log_multiple=True
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)
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# The crawler is created this way since the Shell manually handles the
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# crawling engine, so the set up in the crawl method won't work
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crawler = self.crawler_process._create_crawler(spidercls)
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crawler._apply_settings()
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# The Shell class needs a persistent engine in the crawler
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crawler.engine = crawler._create_engine()
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crawler.engine.start()
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self._start_crawler_thread()
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shell = Shell(crawler, update_vars=self.update_vars, code=opts.code)
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shell.start(url=url, redirect=not opts.no_redirect)
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def _start_crawler_thread(self):
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t = Thread(
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target=self.crawler_process.start,
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kwargs={"stop_after_crawl": False, "install_signal_handlers": False},
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)
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t.daemon = True
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t.start()
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