def save_top_urls_to_mongo(cls,webpages):
for webpage in webpages:
#dictionary of webpage properties
webpage_dict=cls.__get_url_properties_and_sanitize(webpage)
MongoDB.save_modify_url(**webpage_dict)
return cls
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)
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
def scrape_urls(cls):
position=MongoDB.get(MetaData,'position',type='queue')
WebScraper().scrape_links(position)
return cls
def create_url_queue(cls):
sorted_coll=URLToGenre.objects.order_by('_id')
counter=391417#96461
total=391417
try:
while counter<total:
MongoDB.push_to_queue(counter,sorted_coll[counter])
if counter %10000==0:
print('{} done'.format(counter))
counter+=1
except:
pass
print('stopped at {}'.format(counter))
print('last url: {}'.format(sorted_coll[counter]['url']))
return cls
def scrape_urls_multiproc(cls):
#current position
pos=MongoDB.get(MetaData,'position',type='queue')
#current cap
cap=pos
process_queue=queue.Queue(maxsize=settings.NUM_PROCESSES)
#creates all the necessary processes
for p_num in range(0,settings.NUM_PROCESSES):
p=mp.Process(target=WebScraper().scrape_links_from_position,args=[cap])
#get curresponding objects
process_queue.put(p)
cap+=settings.NUM_URLS_PER_PROCESS
#now start
p.start()
head=process_queue.get()
#wait and create new processes as needed
while(pos<MongoDB.count(URLQueue)):
head.join()
if not head.exitcode ==0:
Logger.error('Error with Process, terminating')
return
#update counter
MongoDB.increment_url_counter(settings.NUM_URLS_PER_PROCESS)
p=mp.Process(target=WebScraper().scrape_links_from_position,args=[cap])
process_queue.put(p)
p.start()
#increase both cap and current position
cap+=settings.NUM_URLS_PER_PROCESS
pos+=settings.NUM_URLS_PER_PROCESS
head=process_queue.get()
print(p.exitcode)
return cls
def scrape(self):
home=self.http.get(dmoz_home)
home_page_links=self._scrapeHomeAndGetLinks(home.data)
#visit each link in homepage and dig down
#for url in home_page_links:
i=0
while i<settings.NUM_RANDOM_WEBPAGE:
result=self._scrapPage(home_page_links[random.randint(0,len(home_page_links)-1)])
if result is not None and MongoDB.get_url_object(result['url']) is None:
i+=1
try:
page=utf_8_safe_decode(self.http.get(result['url']).data)
MongoDB.save_modify_url(page=page,**result)
Logger.info("Completed: "+result['url'])
except Exception as ex:
Logger.error(ex)
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 start(cls):
MongoDB.connect(settings.HOST_NAME,settings.PORT)
return cls
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]
