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from __future__ import print_function
from w3lib.url import is_url
from scrapy.command import ScrapyCommand
from scrapy.http import Request
from scrapy.spider import Spider
from scrapy.exceptions import UsageError
from scrapy.utils.spider import create_spider_for_request
class Command(ScrapyCommand):
requires_project = False
def syntax(self):
return "[options] <url>"
def short_desc(self):
return "Fetch a URL using the Scrapy downloader"
def long_desc(self):
return "Fetch a URL using the Scrapy downloader and print its content " \
"to stdout. You may want to use --nolog to disable logging"
def add_options(self, parser):
ScrapyCommand.add_options(self, parser)
parser.add_option("--spider", dest="spider",
help="use this spider")
parser.add_option("--headers", dest="headers", action="store_true", \
help="print response HTTP headers instead of body")
def _print_headers(self, headers, prefix):
for key, values in headers.items():
for value in values:
print('%s %s: %s' % (prefix, key, value))
def _print_response(self, response, opts):
if opts.headers:
self._print_headers(response.request.headers, '>')
print('>')
self._print_headers(response.headers, '<')
else:
print(response.body)
def run(self, args, opts):
if len(args) != 1 or not is_url(args[0]):
raise UsageError()
cb = lambda x: self._print_response(x, opts)
request = Request(args[0], callback=cb, dont_filter=True)
request.meta['handle_httpstatus_all'] = True
crawler = self.crawler_process.create_crawler()
spider = None
if opts.spider:
spider = crawler.spiders.create(opts.spider)
else:
spider = create_spider_for_request(crawler.spiders, request, \
default_spider=Spider('default'))
crawler.crawl(spider, [request])
self.crawler_process.start()
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