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。比如我检索“功夫熊猫之卷轴的秘密”，一个结果都没有。而检索“功夫熊猫“有结果集(功丶夫熊猫⒊英语中英字幕.mp4，功丶夫熊猫2.Kung.Fu.Panda.2.2011.BDrip.720P.国粤英台四语.特效中英字幕.mp4，功丶夫熊猫3(韩版)2016.高清中字.mkv等)或搜索”卷轴的秘密“有结果集([美国]功夫潘达之卷轴的秘密.2016.1080p.mp4, g夫熊猫之卷轴的秘密.HD1280超清中英双字.mp4等)
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()