自顶向下学搜索引擎——北大天网搜索引擎TSE分析及完全注释[1]寻找搜索引擎入口

自顶向下学搜索引擎——北大天网搜索引擎TSE分析及完全注释[1]寻找搜索引擎入口

由于百度博客http://hi.baidu.com/jrckkyy发表文章字数有限,以后原创文章全部都先发表到csdn和cu上,再发表到百度博客上,百度博客除了放原创的文章还主要放网上寻找到的优秀文章。

本着黑客精神我将陆续把最近分析注释TSE搜索引擎的心得发布出来,老鸟,大虾,大牛,高手飘过就是了,若愿意浪费指点下小弟的在下不甚感激,有问题的朋友直接留言讨论。由于本人水平有限,分析和翻译难免有错大家见笑了。

上学期拜读了James F.Kurose著的《计算机网络-自顶向下方法与internet特色(第三版阴影)》,觉得写得确实不错(希望没看的朋友一定要买来看看),自己也来搞个高自顶向下的学习方法,先从用户看得到的东西出发分析研究搜索引擎,下面我们就来看看各大搜索引擎搜索界面的代码,你所需要特别注意的是form表单中的action

雅虎http://www.yohoo.com/:

<form name=s1 style="margin-bottom:0" action="http://search.yahoo.com/search">
<table cellpadding=0 cellspacing=0 border=0><tr><td>
<input type=text size=30 name=p title="enter search terms here">&nbsp;
<input type=submit value=Search>&nbsp;&nbsp;</td><td><font face=arial size=-2>·&nbsp;
<a href="http://search.yahoo.com/search/options?p=">advanced search</a><br>·&nbsp;
<a href="http://buzz.yahoo.com/">most popular</a></font></td></tr></table></form>
谷歌http://www.g.cn:

<form method=GET action=/search><tr><td nowrap>
<font size=-1><input type=text name=q size=41 maxlength=2048 value="jrckkyy" title="Google 搜索"> <input type=submit name=btnG value="Google 搜索"><input type=hidden name=complete value=1><input type=hidden name=hl value="zh-CN"><input type=hidden name=newwindow value=1><input type=hidden name=sa value="2"></font></td></tr></form>
百度http://www.baidu.com:

<form name=f2 action="/s">
<tr valign="middle">
<td nowrap>
<input type=hidden name=ct value="0">
<input type=hidden name=ie value="gb2312">
<input type=hidden name=bs value="jrckkyy">
<input type=hidden name=sr>
<input type=hidden name=z value="">
<input type=hidden name=cl value=3>
<input type=hidden name=f value=8>
<input name=wd size="35" class=i value="jrckkyy" maxlength=100>
<input type=submit value=百度一下> <input type=button value=结果中找 onclick="return bq(f2,1,0);">&nbsp;&nbsp;&nbsp;</td>
<td nowrap><a href="http://utility.baidu.com/quality/quality_form.php?word=jrckkyy">与百度对话</a></td>
</tr>
</form>
天网http://www.tianwang.com/:

<form name=f action="/cgi-bin/tw" method=get>
                <td valign=center width=634 background=images/index_image_02.gif>
                    <table height=46 cellspacing=0 cellpadding=0 width=600 align=right  border=0>
                        <tbody>
                            <tr>
                                <td height=50>
                                    <table cellspacing=0 cellpadding=0 width=600 border=0>
                                        <tbody>
                                            <tr>
                                  <td width="524" height="30" valign="bottom">
                                        <div align="center">                                  <input name="word" type="text" size="40" maxlength="255" onClick="this.focus();checkWord(this,1)" onblutesr='checkWord(this,0)' value='请输入资源名称'>
                                            <font color=#ffffff> &nbsp;
                                            <select onChange=reRange(this.selectedIndex) name=range>
                                                <script language=javascript>...
                           <!--
                           for(var i = 0; i < rescode.length; i++) ...{
                               if(i == 0) ...{
                                   document.write('<option value="0" selected>' + rescode[i][0] + '</option>');
                               } else ...{
                                   document.write('<option value="' + i + '">' + rescode[i][0] + '</option>');
                               }
                           }
                           document.f.range.selectedIndex = 0;
                           -->
                         </script>
                                            </select>
                                            </font>-<font color=#ffffff>
                                            <select name=cd>
                                                <script language=javascript>...
                           <!--
                           var ind = document.f.range.selectedIndex;
                           var len = (rescode[ind].length - 1) / 2;
                           var sel = 0;
                           for(var i = 0; i < len; i++) ...{
                               document.write('<option value="' + rescode[ind][2*i+1] + '">' + rescode[ind][2*i+2] + '</option>');
                               if(rescode[ind][2*i+1] == 0)
                                   sel = i;
                           }
                           document.f.cd.selectedIndex = sel;
                           -->
                 </script>
                                            </select>
                                            </font></div>
                                    </td>
                <td width="71" valign="bottom"><input id=submit2 type=image height=22 width=40 src="images/so2.gif" align=absMiddle name=submit></td>
              </tr>
                                            <tr>
                                                <td colspan=3 height=25 class=style16>
                                                    <div align=center></div>
                                                </td>
                                            </tr>
                                        </tbody>
                                    </table>
                                </td>
                            </tr>
                        </tbody>
                    </table>
                </td>
            </form>
测试服务器TSE:

<form method="get" action="/cgi-bin/index/TSESearch" name="tw">
        <td width="100%" height="25" align="center">                          
        <input type="text" name="word" size="55">
        <input type="submit" value=" 搜索" name="www">
        </td>                          
        <input type="hidden" name="cdtype" value="GB">                        
        </form>   
由以上几个form的属性可以看出全部采用的是get方法,CGI做为处理程序,也就是C/C++,CGI全称是“公共网关界面”(Common Gateway Interface),HTTP服务器与你的或其它机器上的程序进行“交谈”的一种工具,其程序须运行在网络服务器上。CGI逐渐被近几年来的PHP,JAVA,ASP,PERL,Python,Ruby等动态语言所取代。但是其在速度和运行效率上的优势是无法取代的。

以下是TSE CGI入口程序注释,其他搜索引擎的入口也应该类似

 

/**//**
 * 程序翻译说明
 * @Copyright (c) 2008, 研发部
 * All rights reserved.
 *
 * @filesource  TSESearch.cpp
 * @author  jrckkyy <[email protected]>
 *
 * Let's start
 *
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/time.h>
#include <unistd.h>

#include <iostream>
#include <fstream>
#include <list>

#include "Comm.h"    //包含2个索引和1个数据文件
#include "Query.h"    //包含数据查询处理头文件
#include "Document.h"    //html文档处理头文件
#include "StrFun.h"        //字符串处理头文件
#include "ChSeg/Dict.h"    //字元字典处理头文件
#include "ChSeg/HzSeg.h"   
#include "DisplayRst.h"    //返回查询结果页面头文件,返回结果分为头部,中部,底部

using namespace std;

/**//*
 * A inverted file(INF) includes a term-index file & a inverted-lists file.
 * A inverted-lists consists of many bucks(posting lists).
 * The term-index file is stored at vecTerm, and
 * the inverted-lists is sored at mapBuckets.
 */

/**//**
 * 程序翻译说明
 * 搜索程序入口前台关键字提交到该cgi程序 例如:./cgi-bin/index/TSESearch?word=123&start=1
 * 倒排文件包括一个记录检索词文件和一个倒排列表文件。
 * 倒排列表包含很多标志(提交名单)。
 * 记录检索词文件使用vecTerm来排序,和倒排列表是用mapBuckets来排序。
 *
 * @access  public
 * @param   int char 参数的汉字说明 用于接收前台get传递的参数
 * @return  string 0
 */
int main(int argc, char* argv[])
...{
    struct timeval begin_tv, end_tv;
    struct timezone tz;

    CDict iDict;
    map<string, string> dictMap, mapBuckets;
    vector<DocIdx> vecDocIdx;    //Document。h

    CQuery iQuery;
    iQuery.GetInputs();        //具体程序开始执行
    // current query & result page number
    iQuery.SetQuery();
    iQuery.SetStart();

    // begin to search
    //开始具体搜索程序
    gettimeofday(&begin_tv,&tz);    //开始计时获取程序运行时间差

    iQuery.GetInvLists(mapBuckets);        //将所有字符集存入映射变量中    瓶颈所在
    iQuery.GetDocIdx(vecDocIdx);        //将倒排索引存入向量中        瓶颈所在
   
    CHzSeg iHzSeg;        //include ChSeg/HzSeg.h
    iQuery.m_sSegQuery = iHzSeg.SegmentSentenceMM(iDict, iQuery.m_sQuery);    //将get到的查询变量分词分成 "我/        爱/        你们/    的/        格式"
   
    vector<string> vecTerm;
    iQuery.ParseQuery(vecTerm);        //将以"/"划分开的关键字一一顺序放入一个向量容器中
   
    set<string> setRelevantRst;
    iQuery.GetRelevantRst(vecTerm, mapBuckets, setRelevantRst);
   
    gettimeofday(&end_tv,&tz);
    // search end
    //搜索完毕

    //下面开始显示
    CDisplayRst iDisplayRst;
    iDisplayRst.ShowTop();

    float used_msec = (end_tv.tv_sec-begin_tv.tv_sec)*1000
        +((float)(end_tv.tv_usec-begin_tv.tv_usec))/(float)1000;

    iDisplayRst.ShowMiddle(iQuery.m_sQuery,used_msec,
            setRelevantRst.size(), iQuery.m_iStart);

    iDisplayRst.ShowBelow(vecTerm,setRelevantRst,vecDocIdx,iQuery.m_iStart);

    return 0;

}

 

 

你可能感兴趣的:(自顶向下学搜索引擎——北大天网搜索引擎TSE分析及完全注释[1]寻找搜索引擎入口)