class WebScraper(Scraper):
#self.http
def __init__(self):
self.http=Request()
@fail_safe_web
def scrape(self,url,parent):
config.last_url_and_parent=url+', {}'.format('' if parent==None else parent)
new_url=base_util.unreplace_dot_url(url)
response=self.http.get(new_url)
if not hasattr(response,'data') and new_url.startswith('www.'):
new_url=new_url.replace('www.','http://')
response=self.http.get(new_url)
if not hasattr(response,'data'):
new_url=new_url.replace('http://','http://www.')
response=self.http.get(new_url)
if hasattr(response,'data'):
body=base_util.utf_8_safe_decode(response.data)
else:
Logger.error('No data associated with '+new_url)
raise AttributeError(new_url+':::No data')
return body,new_url
@fail_safe_web
def scrape_link_and_child(self,parent_url):
parent_url=base_util.replace_dot_url(parent_url)
webpage_body,parent_url=self.scrape(base_util.unreplace_dot_url(parent_url),None)
#exit if failed to scrap website
if webpage_body is None:
return
MongoDB.save_page(url=parent_url,page=webpage_body)
Logger.info('Completed page: '+parent_url)
#Now, we grab the childs of this webpage
all_ahref=[base_util.combine_parent_rel_link(parent_url,a.attrs['href']) for a in BeautifulSoup(webpage_body,'html.parser', from_encoding="utf-8").find_all('a') if 'href' in a.attrs]
child_urls=random.sample(all_ahref,settings.GET_X_CHILD) if len(all_ahref)>=settings.GET_X_CHILD else all_ahref
#get rid of bad normalization
if not re.match('^www[.].*$',parent_url):
Logger.info('Updating bad url for {}'.format(parent_url))
MongoDB.update_url(base_util.normalize_url(parent_url),parent_url)
if len(child_urls) > 0:
parent_genres=MongoDB.get_genre(parent_url)
#get the childs
for child_url in child_urls:
child_page=self.scrape(child_url,parent_url)
if child_page is None:
exploredset=set()
tries=0
for url in set(all_ahref)^(exploredset):
if tries==settings.MAX_RETRIES:
Logger.info('Max retrie number exceeded')
break
Logger.info("trying new url: "+url)
child_page=self.scrape(url,parent_url)
if child_page is not None:
break
exploredset.add(url)
tries+=1
if child_page is not None:
MongoDB.save_modify_url(url=base_util.replace_dot_url(child_url),parent=[MongoDB.get_url_object(parent_url)],genre=parent_genres,page=child_page)
Logger.info('Completed page: '+child_url)
def scrape_links(self,pos):
doc_object=MongoDB.get(URLQueue,'document',number=pos)
while doc_object is not None:
self.scrape_link_and_child(doc_object['url'])
pos=MongoDB.increment_url_counter()
doc_object=MongoDB.get(URLQueue,'document',number=pos)
class WebScraper(Scraper):
#self.http
def __init__(self):
self.http=Request()
@fail_safe_web
def scrape(self,url,parent):
Logger.debug('Starting url scrap for {}'.format(url))
config.last_url_and_parent=url+', {}'.format('' if parent==None else parent)
new_url=base_util.unreplace_dot_url(url)
response=self.http.get(new_url)
Logger.debug('Got URL')
if not hasattr(response,'data') and new_url.startswith('www.'):
new_url=new_url.replace('www.','http://')
response=self.http.get(new_url)
if not hasattr(response,'data'):
new_url=new_url.replace('http://','http://www.')
response=self.http.get(new_url)
if hasattr(response,'data'):
body=base_util.utf_8_safe_decode(response.data)
else:
Logger.error('No data associated with '+new_url)
raise AttributeError(new_url+':::No data')
return body,new_url
@fail_safe_web
def scrape_link_and_child(self,parent_url):
parent_url=base_util.replace_dot_url(parent_url)
webpage_body,parent_url=self.scrape(base_util.unreplace_dot_url(parent_url),None)
#exit if failed to scrap website
if webpage_body is None:
return
Logger.debug('Saving Parent')
MongoDB.save_page(url=parent_url,page=webpage_body)
Logger.info('Completed page: '+parent_url)
#Now, we grab the childs of this webpage
all_ahref=[base_util.combine_parent_rel_link(parent_url,a.attrs['href']) for a in BeautifulSoup(webpage_body,'html.parser', from_encoding="utf-8").find_all('a') if 'href' in a.attrs]
child_urls=random.sample(all_ahref,settings.GET_X_CHILD) if len(all_ahref)>=settings.GET_X_CHILD else all_ahref
#get rid of bad normalization
if not re.match('^www[.].*$',parent_url):
Logger.info('Updating bad url for {}'.format(parent_url))
MongoDB.update_url(base_util.normalize_url(parent_url),parent_url)
if len(child_urls) > 0:
#get the childs, child urls is a subset of all urls
for child_url in child_urls:
Logger.debug('Get Child {}'.format(child_url))
child_page=self.scrape(child_url,parent_url)
if child_page is None:
exploredset=set()
tries=0
for url in set(all_ahref)^(exploredset):
if tries==settings.MAX_RETRIES:
Logger.info('Max retrie number exceeded')
break
Logger.info("trying new url: "+url)
child_page=self.scrape(url,parent_url)
if child_page is not None:
break
exploredset.add(url)
tries+=1
if child_page is not None:
Logger.debug('Saving Child {}'.format(child_url))
MongoDB.save_modify_url(url=base_util.replace_dot_url(child_url),parent=[MongoDB.get_url_object(parent_url)],genre=[],page=child_page)
Logger.info('Completed page: '+child_url)
def scrape_links(self,pos):
doc_object=MongoDB.get(URLQueue,'document',number=pos)
while doc_object is not None:
self.scrape_link_and_child(doc_object['url'])
pos=MongoDB.increment_url_counter()
doc_object=MongoDB.get(URLQueue,'document',number=pos)
'''
Use multiple process to scrap webpage
'''
def scrape_links_from_position(self,pos):
MongoDB.connect(settings.HOST_NAME,settings.PORT)
links=self.__get_next_urls(pos)
Logger.info(links)
for link in links:
self.scrape_link_and_child(link)
Logger.debug('Process job completed')
return 0
'''
Get the next x urls from url queue depending on the current position number
'''
def __get_next_urls(self,curr_pos):
doc_objs=MongoDB.get_m(URLQueue,'document',number__in=list(range(curr_pos,curr_pos+settings.NUM_URLS_PER_PROCESS)))
return [doc_obj['url'] for doc_obj in doc_objs]