def __init__(self,bookurl_queue,seeds_queue):
self.json_config= f = open("config","r")
#载入json对象
self.json_config = json.load(f)
f.close()
self.spider = Spider("duokan","localhost")
self.bookurl_queue=bookurl_queue
self.seeds_queue = seeds_queue
def __init__(self,bookurl_queue,count):
self.json_config= f = open("config","r")
#载入json对象
self.json_config = json.load(f)
f.close()
self.spider = Spider("duokan","localhost")
self.bookurl_queue=bookurl_queue
self.csvfile = open(self.json_config["csv_path"], 'wb')
self.csv_writer = csv.writer(self.csvfile,dialect="excel")
self.count = count#用于计数
self.book_cache=self.gen_books_from_csv()
def __init__(self,seed_queue,root_url,seed_bak_set=None):
self.json_config= f = open("config","r")
#载入json对象
self.__json_config = json.load(f)
f.close()
self.seed_queue = seed_queue
self.spider = Spider("duokan","localhost")
self.seed_pattern = self.__json_config["child_link_pattern"]
self.has_visited =set()
self.root_url = root_url
self.seed_bak_set = seed_bak_set
class ExtractSeed():
lock = threading.Lock()
def __init__(self,seed_queue,root_url,seed_bak_set=None):
self.json_config= f = open("config","r")
#载入json对象
self.__json_config = json.load(f)
f.close()
self.seed_queue = seed_queue
self.spider = Spider("duokan","localhost")
self.seed_pattern = self.__json_config["child_link_pattern"]
self.has_visited =set()
self.root_url = root_url
self.seed_bak_set = seed_bak_set
# #将一个页面中的seeds抽出来
# def extract_seeds_in_one_page(self,html_page):
# urlset=
# return urlset
def extract_seeds_action(self):
self.__bfs(self.root_url)
def __bfs(self,root):
tem =Queue.Queue(maxsize = 0)
tem.put(root)
while not tem.empty():
seed = tem.get();
if not seed in self.has_visited:
html_page = self.spider.fetch(seed, nb_retries=5, retry_delay=0)
url_set = ExtractSeed.fetch_set(html_page,self.seed_pattern)
ExtractSeed.lock.acquire()
self.has_visited.add(seed)
ExtractSeed.lock.release()
for url in url_set:
if not url in self.has_visited:
tem.put(url)
self.seed_queue.put(url)
# print url
# def backup(self):
# #备份has_visited
# with open ( 'entry.pickle' , 'wb' ) as f :
# ExtractSeed.lock.acquire()
# pickle.dump ( self.has_visited , f )
# ExtractSeed.lock.release()
#
# def load_from_backup(self):
# with open ( 'entry.pickle' , 'rb' ) as f :
# entry = pickle . load ( f )
# self.has_visited=self.has_visited|entry
#抽取一个页面中符合url_pattern的url并返回url_set
@staticmethod
def fetch_set(page,url_pattern):
try:
tem=[]
p = re.compile(url_pattern)
matches = p.finditer(page)
for match in matches:
tem.append(page[match.start():match.end()])
return set(tem)
except:
print "fetch set failed"
return None
class ExtractBook():
def __init__(self,bookurl_queue,count):
self.json_config= f = open("config","r")
#载入json对象
self.json_config = json.load(f)
f.close()
self.spider = Spider("duokan","localhost")
self.bookurl_queue=bookurl_queue
self.csvfile = open(self.json_config["csv_path"], 'wb')
self.csv_writer = csv.writer(self.csvfile,dialect="excel")
self.count = count#用于计数
self.book_cache=self.gen_books_from_csv()
#从配置中Load一本书的pattern，解析后生成json对象的book
def __extract_book(self,html):
try:
book_pattern = self.json_config["book"]
ret={}
for field in book_pattern.keys():
pattern_pair =book_pattern[field]
start_partten =pattern_pair[0]
end_partten =pattern_pair[1]
start_partten =start_partten.encode("utf-8")
end_partten = end_partten.encode("utf-8")
content = ExtractRank.fetch_content_string_match(start_partten, end_partten, html)
ret[field]=content
return ret
except:
print "extract book failed"
return None
#从已抓取的csv中生成book对象
def gen_books_from_csv(self):
csv_path=self.json_config["csv_bak_path"]
with open(csv_path, 'rb') as csvfile:
spamreader = csv.reader(csvfile, dialect='excel')
books_dic={}
co=0
for row in spamreader:
try:
bookid=row[2]
bookid = bookid.lstrip()
bookurl ="http://www.amazon.cn/dp/"+bookid
if not books_dic.has_key(bookurl):
book={}
book["versions"]=unicode(row[5],"utf-8")
book['kindleprice']=unicode(row[6],"utf-8")
book["title"] =unicode(row[3],"utf-8")
book["code"]=bookid
book["publisher"]=unicode(row[1],"utf-8")
book["brand"]=unicode(row[4],"utf-8")
books_dic[bookurl]=book
co+=1
except:
print"it`s empty"
print "\n"
print str(co)
return books_dic
#逻辑主体
def extract_book_action(self):
while True:
try:
book_url_rank_category=self.bookurl_queue.get()#queue为空的时候将被阻塞
url_rank_category = book_url_rank_category.popitem()#将list? 的 第一个元素pop出来bookurl:(count,bookcategory)
book={}
if not self.book_cache.has_key(url_rank_category[0]):
bookpage = self.spider.fetch(url_rank_category[0], nb_retries=2, retry_delay=0.5)
book =self.__extract_book(bookpage)
else:
book.update(self.book_cache[url_rank_category[0]])
book["rank"]=url_rank_category[1][0]
book["category"] =url_rank_category[1][1]
book["datetime"]=time.strftime('%Y-%m-%d-%H-%M-%S',time.localtime(time.time()))
self.csv_writer.writerow(book.values())
self.count+=1
print str(self.count)
except:
print sys.exc_info()[0]
print sys.exc_info()[1]
class ExtractRank():
def __init__(self,bookurl_queue,seeds_queue):
self.json_config= f = open("config","r")
#载入json对象
self.json_config = json.load(f)
f.close()
self.spider = Spider("duokan","localhost")
self.bookurl_queue=bookurl_queue
self.seeds_queue = seeds_queue
#抽取出一个seed中的按rank顺序排列的booklist
def fetch_book_list(self,rootpage):
page_pattern = self.json_config["page_pattern"]
url_pattern = self.json_config["book_link_pattern"]
#获取当前页面的page链接,先用set存放去重，再存成list，排序，保证输出有序
pageset =ExtractSeed.fetch_set(rootpage,page_pattern)
pageset = list(pageset)
pageset.sort()
#获取当前页面的booklisturl链接
book_list=[]
for pageurl in pageset:
page = self.spider.fetch(pageurl,nb_retries=5,retry_delay=1.5)
book_list.extend(ExtractRank.fetch_list(page,url_pattern))#注意 此处抓取的链接有重复
#由于抓取的bookurl相邻的两个重复，所有去一下重复，为了保证排名有序，不能用set,可能可以在正则表达式上改进一下
count =0
ret=[]
for bookurl in book_list:
if count%2==0:
ret.append(bookurl)
count=count+1
return self.__pre_process_booklist(ret)
#将http://www.amazon.cn/%E5%A5%BD%E5%A6%88%E5%A6%88%E8%83%9C%E8%BF%87%E5%A5%BD%E8%80%81%E5%B8%88/dp/B008CM3SUW/ref=zg_bs_143291071_1
#转换为http://www.amazon.cn/dp/B008CM3SUW/
def __pre_process_booklist(self,booklist):
newbooklist=[]
for bookurl in booklist:
start = "dp/"
end = "/ref="
bookid= ExtractRank.fetch_content_string_match(start,end,bookurl)
tem = "http://www.amazon.cn/dp/"+bookid
newbooklist.append(tem)
return newbooklist
#解析排名页bookurl与rank值，并放入队列中
#队列中每个节点是一个dic。dic中只有一对key-value。key是一个url，value是一个元组（rank值，类别）
def __extract_rank_action(self,html):
sorted_booklist = self.fetch_book_list(html)
p=self.json_config["book_category_pattern"]
#这里不encode会出问题，我也没搞清楚为啥要encode,在linux中这里encode会报错
book_category=ExtractRank.fetch_content_string_match(p[0].encode("utf-8"), p[1].encode("utf-8"), html)
#count用来记录排名
count=1
for book in sorted_booklist:
book_rank_dic ={}
book_rank_dic[book]=(count,book_category)#首位是count，第二位是category
count+=1
self.bookurl_queue.put(book_rank_dic)#栈中存放键值对
def extract_rank_action(self):
while True:
seed=self.seeds_queue.get()
htmlpage = self.spider.fetch(seed, nb_retries=2, retry_delay=0)
self.__extract_rank_action(htmlpage)
#将一张html中start_str与end_str中间的内容抽取出来
@staticmethod
def fetch_content_string_match(start_str,end_str,html):
try:
start_len = len(start_str)
tem = html.find(start_str)
start_pos = tem+start_len
end_pos = html.find(end_str,start_pos)
content = html[start_pos:end_pos]
return content
except:
print "extract by str error"
return " "
#将page中匹配url_pattern的链接装到list
@staticmethod
def fetch_list(page,url_pattern):
try:
tem=[]
p = re.compile(url_pattern)
matches = p.finditer(page)
for match in matches:
tem.append(page[match.start():match.end()])
return tem
except:
print"list extract failed"
return None
