Scrapy CrawlSpider 不会退出
Scrapy CrawlSpider doesn't quit
我对 scrapy Crawlspider 有疑问:基本上,如果引发 CloseSpider 异常,它不会像预期的那样退出。下面是代码:
from scrapy.spiders import CrawlSpider, Rule
from scrapy.exceptions import CloseSpider
from scrapy.linkextractors import LinkExtractor
import re
class RecursiveSpider(CrawlSpider):
name = 'recursive_spider'
start_urls = ['https://www.webiste.com/']
rules = (
Rule(LinkExtractor(), callback='parse_item', follow=True),
)
miss = 0
hits = 0
def quit(self):
print("ABOUT TO QUIT")
raise CloseSpider('limits_exceeded')
def parse_item(self, response):
item = dict()
item['url'] = response.url
item['body'] = '\n'.join(response.xpath('//text()').extract())
try:
match = re.search(r"[A-za-z]{0,1}edical[a-z]{2}", response.body_as_unicode()).group(0)
except:
match = 'NOTHING'
print("\n")
print("\n")
print("\n")
print("****************************************INFO****************************************")
if "string" in item['url']:
print(item['url'])
print(match)
print(self.hits)
self.hits += 10
if self.hits > 10:
print("HITS EXCEEDED")
self.quit()
else:
self.miss += 1
print(self.miss)
if self.miss > 10:
print("MISS EXCEEDED")
self.quit()
print("\n")
print("\n")
print("\n")
问题是,虽然我可以看到它进入了条件,并且我可以看到日志中引发了Eception,但爬虫仍在继续爬行。
我 运行 它与:
scrapy crawl recursive_spider
我猜这是一个 scrapy 的例子,只是在关闭时花费了太长时间,而不是实际上忽略了异常。引擎在运行完所有 scheduled/sent 请求后才会退出,因此我建议降低 CONCURRENT_REQUESTS/CONCURRENT_REQUESTS_PER_DOMAIN
设置的值以查看是否适合您。
您创建了一个“递归”Spider 运行程序,因此它以递归方式工作。去掉“rules”参数,抓取完成后就会停止。
我对 scrapy Crawlspider 有疑问:基本上,如果引发 CloseSpider 异常,它不会像预期的那样退出。下面是代码:
from scrapy.spiders import CrawlSpider, Rule
from scrapy.exceptions import CloseSpider
from scrapy.linkextractors import LinkExtractor
import re
class RecursiveSpider(CrawlSpider):
name = 'recursive_spider'
start_urls = ['https://www.webiste.com/']
rules = (
Rule(LinkExtractor(), callback='parse_item', follow=True),
)
miss = 0
hits = 0
def quit(self):
print("ABOUT TO QUIT")
raise CloseSpider('limits_exceeded')
def parse_item(self, response):
item = dict()
item['url'] = response.url
item['body'] = '\n'.join(response.xpath('//text()').extract())
try:
match = re.search(r"[A-za-z]{0,1}edical[a-z]{2}", response.body_as_unicode()).group(0)
except:
match = 'NOTHING'
print("\n")
print("\n")
print("\n")
print("****************************************INFO****************************************")
if "string" in item['url']:
print(item['url'])
print(match)
print(self.hits)
self.hits += 10
if self.hits > 10:
print("HITS EXCEEDED")
self.quit()
else:
self.miss += 1
print(self.miss)
if self.miss > 10:
print("MISS EXCEEDED")
self.quit()
print("\n")
print("\n")
print("\n")
问题是,虽然我可以看到它进入了条件,并且我可以看到日志中引发了Eception,但爬虫仍在继续爬行。 我 运行 它与:
scrapy crawl recursive_spider
我猜这是一个 scrapy 的例子,只是在关闭时花费了太长时间,而不是实际上忽略了异常。引擎在运行完所有 scheduled/sent 请求后才会退出,因此我建议降低 CONCURRENT_REQUESTS/CONCURRENT_REQUESTS_PER_DOMAIN
设置的值以查看是否适合您。
您创建了一个“递归”Spider 运行程序,因此它以递归方式工作。去掉“rules”参数,抓取完成后就会停止。