Hello,
I'm trying to log crawled paths to the meta attribute *req_path*:
import scrapy
from scrapy.linkextractors import LinkExtractor
class ExampleSpider(scrapy.Spider):
name = "example"
allowed_domains = ["www.iana.org"]
start_urls = ['http://www.iana.org/']
request_path_css = dict(
main_menu = r'#home-panel-domains > h2',
domain_names = r'#main_right > p',
)
def links(self, response, restrict_css=None):
lex = LinkExtractor(
allow_domains=self.allowed_domains,
restrict_css=restrict_css)
return lex.extract_links(response)
def requests(self, response, css, cb, append=True):
links = [link for link in self.links(response, css)]
for link in links:
request = scrapy.Request(
url=link.url,
callback=cb)
if append:
request.meta['req_path'] = response.meta['req_path']
request.meta['req_path'].append(dict(txt=link.text, url=link
.url))
else:
request.meta['req_path'] = [dict(txt=link.text, url=link.url
)]
yield request
def parse(self, response):
#self.logger.warn('## Request path: %s', response.meta['req_path'])
css = self.request_path_css['main_menu']
return self.requests(response, css, self.domain_names, False)
def domain_names(self, response):
#self.logger.warn('## Request path: %s', response.meta['req_path'])
css = self.request_path_css['domain_names']
return self.requests(response, css, self.domain_names_parser)
def domain_names_parser(self, response):
self.logger.warn('## Request path: %s', response.meta['req_path'])
Output:
$ scrapy crawl -L WARN example
2017-02-13 11:06:37 [example] WARNING: ## Request path: [{'url':
'http://www.iana.org/domains', 'txt': 'Domain Names'}, {'url':
'http://www.iana.org/domains/root', 'txt': 'The DNS Root Zone'}, {'url':
'http://www.iana.org/domains/int', 'txt': '.INT'}, {'url':
'http://www.iana.org/domains/arpa', 'txt': '.ARPA'}, {'url':
'http://www.iana.org/domains/idn-tables', 'txt': 'IDN Practices
Repository'}, {'url': 'http://www.iana.org/dnssec', 'txt': 'Root Key
Signing Key'}, {'url': 'http://www.iana.org/domains/special', 'txt':
'Special Purpose Domains'}]
2017-02-13 11:06:37 [example] WARNING: ## Request path: [{'url':
'http://www.iana.org/domains', 'txt': 'Domain Names'}, {'url':
'http://www.iana.org/domains/root', 'txt': 'The DNS Root Zone'}, {'url':
'http://www.iana.org/domains/int', 'txt': '.INT'}, {'url':
'http://www.iana.org/domains/arpa', 'txt': '.ARPA'}, {'url':
'http://www.iana.org/domains/idn-tables', 'txt': 'IDN Practices
Repository'}, {'url': 'http://www.iana.org/dnssec', 'txt': 'Root Key
Signing Key'}, {'url': 'http://www.iana.org/domains/special', 'txt':
'Special Purpose Domains'}]
2017-02-13 11:06:37 [example] WARNING: ## Request path: [{'url':
'http://www.iana.org/domains', 'txt': 'Domain Names'}, {'url':
'http://www.iana.org/domains/root', 'txt': 'The DNS Root Zone'}, {'url':
'http://www.iana.org/domains/int', 'txt': '.INT'}, {'url':
'http://www.iana.org/domains/arpa', 'txt': '.ARPA'}, {'url':
'http://www.iana.org/domains/idn-tables', 'txt': 'IDN Practices
Repository'}, {'url': 'http://www.iana.org/dnssec', 'txt': 'Root Key
Signing Key'}, {'url': 'http://www.iana.org/domains/special', 'txt':
'Special Purpose Domains'}]
2017-02-13 11:06:37 [example] WARNING: ## Request path: [{'url':
'http://www.iana.org/domains', 'txt': 'Domain Names'}, {'url':
'http://www.iana.org/domains/root', 'txt': 'The DNS Root Zone'}, {'url':
'http://www.iana.org/domains/int', 'txt': '.INT'}, {'url':
'http://www.iana.org/domains/arpa', 'txt': '.ARPA'}, {'url':
'http://www.iana.org/domains/idn-tables', 'txt': 'IDN Practices
Repository'}, {'url': 'http://www.iana.org/dnssec', 'txt': 'Root Key
Signing Key'}, {'url': 'http://www.iana.org/domains/special', 'txt':
'Special Purpose Domains'}]
2017-02-13 11:06:37 [example] WARNING: ## Request path: [{'url':
'http://www.iana.org/domains', 'txt': 'Domain Names'}, {'url':
'http://www.iana.org/domains/root', 'txt': 'The DNS Root Zone'}, {'url':
'http://www.iana.org/domains/int', 'txt': '.INT'}, {'url':
'http://www.iana.org/domains/arpa', 'txt': '.ARPA'}, {'url':
'http://www.iana.org/domains/idn-tables', 'txt': 'IDN Practices
Repository'}, {'url': 'http://www.iana.org/dnssec', 'txt': 'Root Key
Signing Key'}, {'url': 'http://www.iana.org/domains/special', 'txt':
'Special Purpose Domains'}]
2017-02-13 11:06:38 [example] WARNING: ## Request path: [{'url':
'http://www.iana.org/domains', 'txt': 'Domain Names'}, {'url':
'http://www.iana.org/domains/root', 'txt': 'The DNS Root Zone'}, {'url':
'http://www.iana.org/domains/int', 'txt': '.INT'}, {'url':
'http://www.iana.org/domains/arpa', 'txt': '.ARPA'}, {'url':
'http://www.iana.org/domains/idn-tables', 'txt': 'IDN Practices
Repository'}, {'url': 'http://www.iana.org/dnssec', 'txt': 'Root Key
Signing Key'}, {'url': 'http://www.iana.org/domains/special', 'txt':
'Special Purpose Domains'}]
This is not what I expected, as I would like to have only the last URL in
*response.meta['req_path'][1]*, however all URLs from the last page somehow
have found their way to the list.
In other words, the expected output is such as:
[{'url': 'http://www.iana.org/domains', 'txt': 'Domain Names'}, {'url':
'http://www.iana.org/domains/root', 'txt': 'The DNS Root Zone'}]
[{'url': 'http://www.iana.org/domains', 'txt': 'Domain Names'}, {'url':
'http://www.iana.org/domains/int', 'txt': '.INT'}]
[{'url': 'http://www.iana.org/domains', 'txt': 'Domain Names'}, {'url':
'http://www.iana.org/domains/arpa', 'txt': '.ARPA'}]
[{'url': 'http://www.iana.org/domains', 'txt': 'Domain Names'}, {'url':
'http://www.iana.org/domains/idn-tables', 'txt': 'IDN Practices Repository'
}]
[{'url': 'http://www.iana.org/domains', 'txt': 'Domain Names'}, {'url':
'http://www.iana.org/dnssec', 'txt': 'Root Key Signing Key'}]
[{'url': 'http://www.iana.org/domains', 'txt': 'Domain Names'}, {'url':
'http://www.iana.org/domains/special', 'txt': 'Special Purpose Domains'}]
I appreciate I don't quite understand how Scrapy works, as I think my
Python logic is correct.
Please advise.
Narunas
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