[comments.py] Added support for groups
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rugantio
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@ -24,10 +24,15 @@ class CommentsSpider(FacebookSpider):
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'''
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parse page does multiple things:
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1) loads replied-to-comments page one-by-one (for DFS)
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2) retrieves not-replied-to comments
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2) call parse_reply on the nested comments
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3) adds simple (not-replied-to) comments
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4) follows to new comment page
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'''
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#loads replied-to comments pages
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#load replied-to comments pages
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#select nested comment one-by-one matching with the index: response.meta['index']
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path = './/div[string-length(@class) = 2 and count(@id)=1 and contains("0123456789", substring(@id,1,1)) and .//div[contains(@id,"comment_replies")]]' + '['+ str(response.meta['index']) + ']'
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group_flag = response.meta['group'] if 'group' in response.meta else None
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for reply in response.xpath(path):
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source = reply.xpath('.//h3/a/text()').extract()
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answer = reply.xpath('.//a[contains(@href,"repl")]/@href').extract()
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@ -38,9 +43,10 @@ class CommentsSpider(FacebookSpider):
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meta={'reply_to':source,
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'url':response.url,
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'index':response.meta['index'],
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'flag':'init'})
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#loads regular comments
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if not response.xpath(path):
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'flag':'init',
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'group':group_flag})
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#load regular comments
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if not response.xpath(path): #prevents from exec
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path2 = './/div[string-length(@class) = 2 and count(@id)=1 and contains("0123456789", substring(@id,1,1)) and not(.//div[contains(@id,"comment_replies")])]'
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for i,reply in enumerate(response.xpath(path2)):
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self.logger.info('{} regular comment @ page {}'.format(i,response.url))
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@ -53,15 +59,29 @@ class CommentsSpider(FacebookSpider):
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new.add_value('url',response.url)
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yield new.load_item()
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#previous comments
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#new comment page
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if not response.xpath(path):
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for next_page in response.xpath('.//div[contains(@id,"see_next")]'):
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#for groups
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next_xpath = './/div[contains(@id,"see_next")]'
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prev_xpath = './/div[contains(@id,"see_prev")]'
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if not response.xpath(next_xpath) or group_flag == 1:
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for next_page in response.xpath(prev_xpath):
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new_page = next_page.xpath('.//@href').extract()
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new_page = response.urljoin(new_page[0])
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self.logger.info('New page to be crawled {}'.format(new_page))
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yield scrapy.Request(new_page,
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callback=self.parse_page,
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meta={'index':1})
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meta={'index':1,
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'group':1})
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else:
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for next_page in response.xpath(next_xpath):
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new_page = next_page.xpath('.//@href').extract()
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new_page = response.urljoin(new_page[0])
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self.logger.info('New page to be crawled {}'.format(new_page))
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yield scrapy.Request(new_page,
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callback=self.parse_page,
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meta={'index':1,
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'group':group_flag})
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def parse_reply(self,response):
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'''
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@ -101,13 +121,16 @@ class CommentsSpider(FacebookSpider):
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meta={'reply_to':response.meta['reply_to'],
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'flag':'back',
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'url':response.meta['url'],
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'index':response.meta['index']})
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'index':response.meta['index'],
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'group':response.meta['group']})
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else:
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next_reply = response.meta['url']
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self.logger.info('Nested comments crawl finished, heading to proper page: {}'.format(response.meta['url']))
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yield scrapy.Request(next_reply,
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callback=self.parse_page,
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meta={'index':response.meta['index']+1})
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meta={'index':response.meta['index']+1,
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'group':response.meta['group']})
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elif response.meta['flag'] == 'back':
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#parse all comments
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@ -132,10 +155,39 @@ class CommentsSpider(FacebookSpider):
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meta={'reply_to':response.meta['reply_to'],
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'flag':'back',
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'url':response.meta['url'],
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'index':response.meta['index']})
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'index':response.meta['index'],
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'group':response.meta['group']})
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else:
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next_reply = response.meta['url']
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self.logger.info('Nested comments crawl finished, heading to home page: {}'.format(response.meta['url']))
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yield scrapy.Request(next_reply,
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callback=self.parse_page,
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meta={'index':response.meta['index']+1})
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meta={'index':response.meta['index']+1,
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'group':response.meta['group']})
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# =============================================================================
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# CRAWL REACTIONS
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# =============================================================================
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# def parse_reactions(self,response):
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# new = ItemLoader(item=CommentsItem(),response=response, parent=response.meta['item'])
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# new.context['lang'] = self.lang
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# new.add_xpath('likes',"//a[contains(@href,'reaction_type=1')]/span/text()")
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# new.add_xpath('ahah',"//a[contains(@href,'reaction_type=4')]/span/text()")
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# new.add_xpath('love',"//a[contains(@href,'reaction_type=2')]/span/text()")
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# new.add_xpath('wow',"//a[contains(@href,'reaction_type=3')]/span/text()")
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# new.add_xpath('sigh',"//a[contains(@href,'reaction_type=7')]/span/text()")
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# new.add_xpath('grrr',"//a[contains(@href,'reaction_type=8')]/span/text()")
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# yield new.load_item()
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#
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# #substitute
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# yield new.load_item()
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# ‾‾‾‾‾‾‾‾‾|‾‾‾‾‾‾‾‾‾‾‾
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# _________v___
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# #response --> reply/root
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# reactions = response.xpath(".//a[contains(@href,'reaction/profile')]/@href")
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# reactions = response.urljoin(reactions[0].extract())
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# if reactions:
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# yield scrapy.Request(reactions, callback=self.parse_reactions, meta={'item':new})
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# else:
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# yield new.load_item()
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@ -66,7 +66,7 @@ class FacebookSpider(scrapy.Spider):
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else:
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self.logger.info('Lang "{}" not currently supported'.format(self.lang))
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self.logger.info('Currently supported languages are: "en", "es", "fr", "it", "pt"')
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self.logger.info('Change your interface lang from facebook and try again')
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self.logger.info('Change your interface lang from facebook settings and try again')
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raise AttributeError('Language provided not currently supported')
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#current year, this variable is needed for parse_page recursion
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@ -140,7 +140,7 @@ class FacebookSpider(scrapy.Spider):
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for post in response.xpath("//div[contains(@data-ft,'top_level_post_id')]"):
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new = ItemLoader(item=FbcrawlItem(),selector=post)
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self.logger.info('Parsing post n = {}'.format(abs(self.count)))
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new.add_xpath('comments', "./div[2]/div[2]/a[1]/text()")
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new.add_xpath('comments', './div[2]/div[2]/a[1]/text()')
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new.add_xpath('url', ".//a[contains(@href,'footer')]/@href")
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#page_url #new.add_value('url',response.url)
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@ -150,9 +150,10 @@ class FacebookSpider(scrapy.Spider):
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self.count -= 1
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yield scrapy.Request(temp_post, self.parse_post, priority = self.count, meta={'item':new})
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#load following page
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#tries to click on "more", otherwise it looks for the appropriate
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#year for 1-click only and proceeds to click on others
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#load following page, try to click on "more"
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#after few pages have gone scraped, the "more" link disappears
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#if not present look for the highest year not parsed yet, click once
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#and keep looking for "more"
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new_page = response.xpath("//div[2]/a[contains(@href,'timestart=') and not(contains(text(),'ent')) and not(contains(text(),number()))]/@href").extract()
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if not new_page:
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if response.meta['flag'] == self.k and self.k >= self.year:
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@ -165,7 +166,7 @@ class FacebookSpider(scrapy.Spider):
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self.logger.info('Everything OK, new flag: {}'.format(self.k))
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yield scrapy.Request(new_page, callback=self.parse_page, meta={'flag':self.k})
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else:
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while not new_page: #sometimes the years are skipped
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while not new_page: #sometimes the years are skipped this handles small year gaps
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self.logger.info('XPATH not found for year {}'.format(self.k-1))
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self.k -= 1
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self.logger.info('Trying with previous year, flag={}'.format(self.k))
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