def _process_page(self, item, spider):
cnt = {'filte':0,'enqueue':0,'refuse':len(item['refused_links']),'other_link':0}
# 记录爬取过此网址
self.server.sadd(spider.URL_VISITED_KEY, item['url'])
domain, ret_type = domain_getter.get_domain(item['url'])
# 记录域名的bloom filter中未出现过此域名
if not self.bloom_domain_vec.add(domain):
self._initRelateDomain(domain, spider)
# redis数据库总表中不存在这个域名
if not self.server.exists(domains_key%domain):
self._initGlobalDomain(domain)
for link in item['links']:
link_domain, ret_type = domain_getter.get_domain(link)
# 判断域名是否和当前爬取域名D0相同
if link_domain == spider.CRAWLING_DOMAIN:
# D0的size+1
self.server.hincrby(domains_key%link_domain, 'size', 1)
self.server.hincrby(related_domains_key%(spider.CRAWLING_DOMAIN,domain), 'size', 1)
# 判断其netloc是否出现过
netloc = urlparse(link).netloc
if not self.bloom_netloc_vec.add(netloc):
if self._isBlogLink(link):
# 在过滤名单内,直接跳过
self.server.sadd(spider.BLOG_IGNORE_KEY, link)
cnt['filte'] += 1
else:
# 未出现过,网页进入队列
self.server.rpush(spider.URL_QUEUE_KEY, "http://"+netloc)
cnt['enqueue'] += 1
else:# 不同,则判断域名是否已经出现过
cnt['other_link'] += 1
if self.bloom_domain_vec.add(link_domain):
# 已出现过,对应的记录D1入度+1
self.server.hincrby(domains_key%link_domain, 'indegree', 1)
self.server.hincrby(related_domains_key%(spider.CRAWLING_DOMAIN,link_domain), 'indegree', 1)
else:
# 没出现过,则Domain中增加记录D1,D1记录入度初始化为1,出度初始化为0;D0出度+1
if not self.server.exists(domains_key%domain):
self._initGlobalDomain(link_domain)
self.server.hincrby(domains_key%domain, 'outdegree', 1)
self._initRelateDomain(link_domain, spider)
self.server.hincrby(related_domains_key%(spider.CRAWLING_DOMAIN,link_domain), 'outdegree', 1)
for link in item['refused_links']:
spider.log(link+" refuse by robots.txt", level=log.INFO)
self.server.sadd(spider.ROBOT_REFUSED_KEY, link)
spider.log('%s from %s'%(str(cnt), item['url']), level=log.INFO)
def _process_page(self, item, spider): # 记录爬取过此网址 self.server.rpush(spider.URL_VISITED_KEY, item['url']) domain, ret_type = domain_getter.get_domain(item['url']) if not self.bloom_domain_vec.add(domain): self._initRelateDomain(domain, spider) if not self.server.exists(domains_key%domain): self._initGlobalDomain(domain) for link in item['links']: if self._isBlogLink(link): self.server.rpush(spider.BLOG_IGNORE_KEY, link) continue link_domain, ret_type = domain_getter.get_domain(link) # 判断域名是否和当前爬取域名D0相同 if link_domain == spider.CRAWLING_DOMAIN: # D0的size+1 self.server.hincrby(domains_key%link_domain, 'size', 1) self.server.hincrby(related_domains_key%(spider.CRAWLING_DOMAIN,domain), 'size', 1) # 判断其netloc是否出现过 netloc = urlparse(link).netloc if not self.bloom_netloc_vec.add(netloc): # 未出现过,网页进入队列 self.server.rpush(spider.URL_QUEUE_KEY, "http://"+netloc) else:# 不同,则判断域名是否已经出现过 if self.bloom_domain_vec.add(link_domain): # 已出现过,对应的记录D1入度+1 self.server.hincrby(domains_key%link_domain, 'indegree', 1) self.server.hincrby(related_domains_key%(spider.CRAWLING_DOMAIN,link_domain), 'indegree', 1) else: # 没出现过,则Domain中增加记录D1,D1记录入度初始化为1,出度初始化为0;D0出度+1 if not self.server.exists(domains_key%domain): self._initGlobalDomain(link_domain) self.server.hincrby(domains_key%domain, 'outdegree', 1) self._initRelateDomain(link_domain, spider) self.server.hincrby(related_domains_key%(spider.CRAWLING_DOMAIN,link_domain), 'outdegree', 1) for link in item['refused_links']: spider.log(link+" refuse by robots.txt", level=log.INFO) self.server.rpush(spider.ROBOT_REFUSED_KEY, link)
def __init__(self, begin="http://www.163.com"): super(WebModelSpider, self).__init__() print 'initing spider with begin:',begin # 根据begin参数修改redis数据库中存储键值 self.CRAWLING_DOMAIN = domain_getter.get_domain(begin)[0] self.URL_QUEUE_KEY = url_queue_key%self.CRAWLING_DOMAIN self.URL_VISITED_KEY = url_visited_key%self.CRAWLING_DOMAIN self.BLOG_IGNORE_KEY = url_ignore_key%self.CRAWLING_DOMAIN self.ROBOT_REFUSED_KEY = robots_refused_key%self.CRAWLING_DOMAIN self.BEGIN_URL = begin
def __init__(self, begin="http://www.163.com"):
super(WebModelSpider, self).__init__()
print 'initing spider with begin:', begin
# 根据begin参数修改redis数据库中存储键值
self.CRAWLING_DOMAIN = domain_getter.get_domain(begin)[0]
self.URL_QUEUE_KEY = url_queue_key % self.CRAWLING_DOMAIN
self.URL_VISITED_KEY = url_visited_key % self.CRAWLING_DOMAIN
self.BLOG_IGNORE_KEY = url_ignore_key % self.CRAWLING_DOMAIN
self.ROBOT_REFUSED_KEY = robots_refused_key % self.CRAWLING_DOMAIN
self.BEGIN_URL = begin
def parse(self, response):
if response.status != 200:
self.log("Response code: %d from %s"%(response.status, response['url']), level=log.WARNING)
return
# 解析url,获取域名
netloc = urlparse(response.url).netloc
domain, ret_type = domain_getter.get_domain(response.url)
# 检查并获取domain对应的robots内容
# robotsparser用以判断url是否被robots.txt内规则允许
robotsparser, rulesetItem = self.getRuleset(domain)
# 把rulesetItem送到pipeline
yield rulesetItem
#IP地址
if ret_type == TYPE_IP:
return
pageItem = PageItem()
# 使用xpath获取内容
pageItem['url'] = response.url
hxs = Selector(text=response.body)
try:
pageItem['title'] = hxs.xpath('/html/head/title/text()').extract()[0]
except IndexError:
pageItem['title'] = '(crwal title failed)'
pageItem['links'] = []
pageItem['refused_links'] = []
# 把所有<a>标签的超链接提取出来
for link in hxs.xpath('//a/@href').extract() :
# 判断超链接内容是否为一个合法网址/相对网址
if link.startswith('http://') :
pageItem['links'].append(link)
# robots判定
if not robotsparser or robotsparser.is_allowed('*', link):
pageItem['links'].append(link)
#Schedule从redis队列中获取, 不在这里发起请求
# yield Request(link, callback=self.parse)
else:
pageItem['refused_links'].append(link)
elif link.startswith('/') :
# 相对定位,把网址补全,再yield请求
link = "http://"+ netloc + link
pageItem['links'].append(link)
# robots判定
if not robotsparser or robotsparser.is_allowed('*', link) :
pageItem['links'].append(link)
#Schedule从redis队列中获取, 不在这里发起请求
# yield Request(link, callback=self.parse)
else:
pageItem['refused_links'].append(link)
else :
# 不符合以上两种,一般为javascript函数
# msg = '%s : not a url'%(link,)
# self.log(msg, level=log.DEBUG)
pass
msg = 'crwal %d links from %s.'%(
len(pageItem['links']), pageItem['url'])
self.log(msg, level=log.INFO)
# log.msg(repr(pageItem).decode("unicode-escape") + '\n', level=log.INFO, spider=self)
yield pageItem
def parse(self, response):
if response.status != 200:
self.log("Response code: %d from %s" %
(response.status, response['url']),
level=log.WARNING)
return
# 解析url,获取域名
netloc = urlparse(response.url).netloc
domain, ret_type = domain_getter.get_domain(response.url)
# 检查并获取domain对应的robots内容
# robotsparser用以判断url是否被robots.txt内规则允许
robotsparser, rulesetItem = self.getRuleset(domain)
# 把rulesetItem送到pipeline
yield rulesetItem
#IP地址
if ret_type == TYPE_IP:
return
pageItem = PageItem()
# 使用xpath获取内容
pageItem['url'] = response.url
hxs = Selector(text=response.body)
try:
pageItem['title'] = hxs.xpath(
'/html/head/title/text()').extract()[0]
except IndexError:
pageItem['title'] = '(crwal title failed)'
pageItem['links'] = []
pageItem['refused_links'] = []
# 把所有<a>标签的超链接提取出来
for link in hxs.xpath('//a/@href').extract():
# 判断超链接内容是否为一个合法网址/相对网址
if link.startswith('http://'):
pageItem['links'].append(link)
# robots判定
if not robotsparser or robotsparser.is_allowed('*', link):
pageItem['links'].append(link)
#Schedule从redis队列中获取, 不在这里发起请求
# yield Request(link, callback=self.parse)
else:
pageItem['refused_links'].append(link)
elif link.startswith('/'):
# 相对定位,把网址补全,再yield请求
link = "http://" + netloc + link
pageItem['links'].append(link)
# robots判定
if not robotsparser or robotsparser.is_allowed('*', link):
pageItem['links'].append(link)
#Schedule从redis队列中获取, 不在这里发起请求
# yield Request(link, callback=self.parse)
else:
pageItem['refused_links'].append(link)
else:
# 不符合以上两种,一般为javascript函数
# msg = '%s : not a url'%(link,)
# self.log(msg, level=log.DEBUG)
pass
msg = 'crwal %d links from %s.' % (len(
pageItem['links']), pageItem['url'])
self.log(msg, level=log.INFO)
# log.msg(repr(pageItem).decode("unicode-escape") + '\n', level=log.INFO, spider=self)
yield pageItem
