def scrape_website(seeds, base_url, force_download=False):
# keep scraping and indexing until we run out of links to find
# to keep track of what we need to find and where we're going
links_to_follow = set(
["/" + "/".join(seed.split("/")[3:]) for seed in seeds])
visited_links = set()
index = {}
# repeat until we run out of links
while links_to_follow:
print("Number of pages in queue: {}".format(len(links_to_follow)))
new_url = links_to_follow.pop()
visited_links.add(new_url)
maybe_save_url(base_url + new_url, force_download=force_download)
links_to_follow = (links_to_follow | get_links_from_url(
base_url + new_url, force_download=force_download)) - visited_links
add_page_to_index(base_url + new_url, index)
# save the list of pages we've got
with open(get_filename(base_url + "/scraped_pages.txt"), "w") as f:
f.write(base_url + "\n{}".format(base_url).join(sorted(visited_links)))
sort_and_store_index(index, base_url)
def crawl_web(seed):
tocrawl = [seed]
crawled = []
index = []
while tocrawl:
page = tocrawl.pop()
content = get_page(page)
indexer.add_page_to_index(index, page, content)
if page not in crawled:
union(tocrawl, get_all_links(content))
crawled.append(page)
return index
def crawl_web(seed):
tocrawl = [seed]
crawled = []
graph = {} #<url>:[list of pages it links to]
index = {}
while tocrawl:
page = tocrawl.pop()
if page not in crawled:
content = get_page(page)
indexer.add_page_to_index(index, page, content)
outlinks = get_all_links(content)
graph[page] = outlinks
union(tocrawl, outlinks)
crawled.append(page)
#print(crawled)
return index, graph
def crawl(user_id,type=INITIAL_CRAWL, url=None):
# retrieve user info
user = User.get_by_key_name(user_id)
if type == INITIAL_CRAWL:
# already indexed, ignore
if user.indexed:
logging.info('Already crawled %d for %s' % (user.num_indexed, user_id))
task_crawl_previous(user_id, user.previous_url)
return
# Initial crawl url
url = 'https://graph.facebook.com/%s/posts?access_token=%s' % (user.id, user.access_token)
logging.info('start crawl: type=%d user_id=%s url=%s' % (type, user_id, url))
try:
result = urllib2.urlopen(url)
data = result.read()
logging.info(data)
json_data = json.loads(data)
posts = []
index = {}
for entity in json_data['data']:
if 'message' in entity:
post = Post(parent=user,key_name=entity['id'],id = entity['id'],from_name = entity['from']['name'],from_id=entity['from']['id'])
post.message = entity['message']
post.type = entity['type']
post.created_time = entity['created_time']
post.likes_count = 0
if 'likes' in entity:
post.likes_count = entity['likes']['count']
post.comments_count = 0
if 'comments' in entity:
post.comments_count =entity['comments']['count']
add_page_to_index(index, entity['id'], entity['message'])
posts.append(post)
if len(posts):
# store posts
db.put(posts)
store_index_in_db(index, user)
# store previous url in queue
if type == INITIAL_CRAWL:
if 'paging' in json_data:
if 'previous' in json_data['paging']:
previous = json_data['paging']['previous']
logging.info(previous)
if len(previous) > 0:
user.previous_url = previous
# update user
count = 0
if type != INITIAL_CRAWL:
count = user.num_indexed
user.num_indexed = count + len(posts)
user.last_indexed = datetime.datetime.now()
user.indexed = True
user.put()
# create task for next or previous page
if 'paging' in json_data:
if type == INITIAL_CRAWL or type == NEXT_CRAWL:
# store next url in queue
if 'next' in json_data['paging']:
next = json_data['paging']['next']
logging.info(next)
if len(next) > 0:
task_crawl_next(user_id, next)
elif type == PREVIOUS_CRAWL:
# store previous url in queue
if 'previous' in json_data['paging']:
previous = json_data['paging']['previous']
logging.info(previous)
if len(previous) > 0:
task_crawl_previous(user_id, previous)
except urllib2.URLError, e:
logging.error(e)
logging.error(e.read())
