基于 python 的百度云网盘资源搜索引擎设计架构

大家都知道百度云网盘上有很多分享的资源，包括软件、各类视频自学教程、电子书、甚至各种电影、 BT 种子应有尽有，但百度云却没有提供相应的搜索功能。个人平时要找一些软件、美剧觉得非常蛋疼。于是就尝试开发一个百度云资源的搜索系统。资源爬虫思路：搜索引擎么最重要的就是有海量的资源了，有了资源，只要再基于资源实现全文检索功能就是一个简单的搜索引擎了。首先我需要爬取百度云的分享资源，爬取思路，打开任意一个百度云分享者的主页 yun.baidu.com/share/home?uk=xxxxxx&view=share#category/type=0,你可以发现分享者有订阅者和粉丝，你可以递归遍历订阅者和粉丝，从而获得大量分享者 uk ，进而获得大量的分享资源。系统实现环境：语言： python 操作系统： Linux 其他中间件： nginx mysql sphinx 系统包括几个独立的部分： 1 、基于 requests 实现的独立资源爬虫 2 、基于开源全文检索引擎 sphinx 实现的资源索引程序 3 、基于 Django+bootstrap3 开发的简易网站，网站搭建采用 nginx1.8+fastCGI(flup)+python 。演示网站 http://www.itjujiao.com PS: 目前爬虫爬取了 4000W 左右的数据， sphinx 对内存的要求实在太大了，巨坑。百度会对爬虫做 ip 限制，写了个简单的 xicidaili 代理采集程序， requests 可以配置 http 代理。分词是 sphinx 自带的实现，支持中文分词，中文基于一元分词，有点过度分词，分词效果不是特别理想，比如我搜关键词“叶问 3 ”出现的结果中会有“叶子的问题第 3 版”，不符合预期。英文分词有很多可以改善的地方，比如我搜 xart 不会出现 x-art 的结果，而实际上 x-art 却也是我想要的结果集(你们懂的)。数据库是 mysql ，资源表，考虑单表记录上限，分了 10 个表。第一次爬完 sphinx 做全量索引，后续做增量索引。后续优化： 1 、分词处理，目前分词搜索结果不是很理想，有大神可以指点下思路 2 、数据去重，目前发现抓取的数据很多是共享资源，后续考虑基于 MD5 去重

爬虫部分实现代码（只是思路代码有点乱）： #coding: utf8

import re import urllib2 import time from Queue import Queue import threading, errno, datetime import json import requests import MySQLdb as mdb

DB_HOST = '127.0.0.1' DB_USER = 'root' DB_PASS = ''

re_start = re.compile(r'start=(\d+)') re_uid = re.compile(r'query_uk=(\d+)') re_pptt = re.compile(r'&pptt=(\d+)') re_urlid = re.compile(r'&urlid=(\d+)')

ONEPAGE = 20 ONESHAREPAGE = 20

URL_SHARE = 'http://yun.baidu.com/pcloud/feed/getsharelist?auth_type=1&start={start}&limit=20&query_uk={uk}&urlid={id}' URL_FOLLOW = 'http://yun.baidu.com/pcloud/friend/getfollowlist?query_uk={uk}&limit=20&start={start}&urlid={id}' URL_FANS = 'http://yun.baidu.com/pcloud/friend/getfanslist?query_uk={uk}&limit=20&start={start}&urlid={id}'

QNUM = 1000 hc_q = Queue(20) hc_r = Queue(QNUM)

success = 0 failed = 0

PROXY_LIST = [[0, 10, "42.121.33.160", 809, "", "", 0], [5, 0, "218.97.195.38", 81, "", "", 0], ]

def req_worker(inx): s = requests.Session() while True: req_item = hc_q.get()

    req_type = req_item[0]
    url = req_item[1]
    r = s.get(url)
    hc_r.put((r.text, url))
    print "req_worker#", inx, url

def response_worker(): dbconn = mdb.connect(DB_HOST, DB_USER, DB_PASS, 'baiduyun', charset='utf8') dbcurr = dbconn.cursor() dbcurr.execute('SET NAMES utf8') dbcurr.execute('set global wait_timeout=60000') while True:

    metadata, effective_url = hc_r.get()
    #print "response_worker:", effective_url
    try:
        tnow = int(time.time())
        id = re_urlid.findall(effective_url)[0]
        start = re_start.findall(effective_url)[0]
        if True:
            if 'getfollowlist' in effective_url: #type = 1
                follows = json.loads(metadata)
                uid = re_uid.findall(effective_url)[0]
                if "total_count" in follows.keys() and follows["total_count"]>0 and str(start) == "0":
                    for i in range((follows["total_count"]-1)/ONEPAGE):
                        try:
                            dbcurr.execute('INSERT INTO urlids(uk, start, limited, type, status) VALUES(%s, %s, %s, 1, 0)' % (uid, str(ONEPAGE*(i+1)), str(ONEPAGE)))
                        except Exception as ex:
                            print "E1", str(ex)
                            pass
                
                if "follow_list" in follows.keys():
                    for item in follows["follow_list"]:
                        try:
                            dbcurr.execute('INSERT INTO user(userid, username, files, status, downloaded, lastaccess) VALUES(%s, "%s", 0, 0, 0, %s)' % (item['follow_uk'], item['follow_uname'], str(tnow)))
                        except Exception as ex:
                            print "E13", str(ex)
                            pass
                else:
                    print "delete 1", uid, start
                    dbcurr.execute('delete from urlids where uk=%s and type=1 and start>%s' % (uid, start))
            elif 'getfanslist' in effective_url: #type = 2
                fans = json.loads(metadata)
                uid = re_uid.findall(effective_url)[0]
                if "total_count" in fans.keys() and fans["total_count"]>0 and str(start) == "0":
                    for i in range((fans["total_count"]-1)/ONEPAGE):
                        try:
                            dbcurr.execute('INSERT INTO urlids(uk, start, limited, type, status) VALUES(%s, %s, %s, 2, 0)' % (uid, str(ONEPAGE*(i+1)), str(ONEPAGE)))
                        except Exception as ex:
                            print "E2", str(ex)
                            pass
                
                if "fans_list" in fans.keys():
                    for item in fans["fans_list"]:
                        try:
                            dbcurr.execute('INSERT INTO user(userid, username, files, status, downloaded, lastaccess) VALUES(%s, "%s", 0, 0, 0, %s)' % (item['fans_uk'], item['fans_uname'], str(tnow)))
                        except Exception as ex:
                            print "E23", str(ex)
                            pass
                else:
                    print "delete 2", uid, start
                    dbcurr.execute('delete from urlids where uk=%s and type=2 and start>%s' % (uid, start))
            else:
                shares = json.loads(metadata)
                uid = re_uid.findall(effective_url)[0]
                if "total_count" in shares.keys() and shares["total_count"]>0 and str(start) == "0":
                    for i in range((shares["total_count"]-1)/ONESHAREPAGE):
                        try:
                            dbcurr.execute('INSERT INTO urlids(uk, start, limited, type, status) VALUES(%s, %s, %s, 0, 0)' % (uid, str(ONESHAREPAGE*(i+1)), str(ONESHAREPAGE)))
                        except Exception as ex:
                            print "E3", str(ex)
                            pass
                if "records" in shares.keys():
                    for item in shares["records"]:
                        try:
                            dbcurr.execute('INSERT INTO share(userid, filename, shareid, status) VALUES(%s, "%s", %s, 0)' % (uid, item['title'], item['shareid']))
                        except Exception as ex:
                            #print "E33", str(ex), item
                            pass
                else:
                    print "delete 0", uid, start
                    dbcurr.execute('delete from urlids where uk=%s and type=0 and start>%s' % (uid, str(start)))
            dbcurr.execute('delete from urlids where id=%s' % (id, ))
            dbconn.commit()
    except Exception as ex:
        print "E5", str(ex), id

    
    pid = re_pptt.findall(effective_url)
    
    if pid:
        print "pid>>>", pid
        ppid = int(pid[0])
        PROXY_LIST[ppid][6] -= 1
dbcurr.close()
dbconn.close()

def worker(): global success, failed dbconn = mdb.connect(DB_HOST, DB_USER, DB_PASS, 'baiduyun', charset='utf8') dbcurr = dbconn.cursor() dbcurr.execute('SET NAMES utf8') dbcurr.execute('set global wait_timeout=60000') while True:

    #dbcurr.execute('select * from urlids where status=0 order by type limit 1')
    dbcurr.execute('select * from urlids where status=0 and type>0 limit 1')
    d = dbcurr.fetchall()
    #print d
    if d:
        id = d[0][0]
        uk = d[0][1]
        start = d[0][2]
        limit = d[0][3]
        type = d[0][4]
        dbcurr.execute('update urlids set status=1 where id=%s' % (str(id),))
        url = ""
        if type == 0:
            url = URL_SHARE.format(uk=uk, start=start, id=id).encode('utf-8')
        elif  type == 1:
            url = URL_FOLLOW.format(uk=uk, start=start, id=id).encode('utf-8')
        elif type == 2:
            url = URL_FANS.format(uk=uk, start=start, id=id).encode('utf-8')
        if url:
            hc_q.put((type, url))
            
        #print "processed", url
    else:
        dbcurr.execute('select * from user where status=0 limit 1000')
        d = dbcurr.fetchall()
        if d:
            for item in d:
                try:
                    dbcurr.execute('insert into urlids(uk, start, limited, type, status) values("%s", 0, %s, 0, 0)' % (item[1], str(ONESHAREPAGE)))
                    dbcurr.execute('insert into urlids(uk, start, limited, type, status) values("%s", 0, %s, 1, 0)' % (item[1], str(ONEPAGE)))
                    dbcurr.execute('insert into urlids(uk, start, limited, type, status) values("%s", 0, %s, 2, 0)' % (item[1], str(ONEPAGE)))
                    dbcurr.execute('update user set status=1 where userid=%s' % (item[1],))
                except Exception as ex:
                    print "E6", str(ex)
        else:
            time.sleep(1)
            
    dbconn.commit()
dbcurr.close()
dbconn.close()

for item in range(16):
t = threading.Thread(target = req_worker, args = (item,)) t.setDaemon(True) t.start()

s = threading.Thread(target = worker, args = ()) s.setDaemon(True) s.start()

response_worker()

13 条回复 • 2016-05-19 09:23:56 +08:00