【项目实战】基于高并发服务器的搜索引擎

发布于:2024-04-27 ⋅ 阅读:(39) ⋅ 点赞:(0)

【项目实战】基于高并发服务器的搜索引擎

作者:爱写代码的刚子
时间:2024.4.24
前言:基于高并发服务器的搜索引擎,引用了第三方库cpp-httplib,cppjieba,项目的要点在代码注释中了

搜索引擎部分代码

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.min.js"></script>
    <title>本地 boost 搜索引擎</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html, body {
            height: 100%;
            font-family: Arial, sans-serif;
        }
        .container {
            width: 100%;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .title {
            width: 100%;
            background-color: #4e6ef2;
            color: #fff;
            text-align: center;
            padding: 10px 0;
            font-size: 24px;
            font-weight: bold;
        }
        .search-container {
            width: 100%;
            background-color: #f2f2f2;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px 0;
            position: relative;
        }
        .search-input {
            width: calc(100% - 130px); /* 调整搜索框宽度 */
            max-width: 300px; /* 设置最大宽度 */
            height: 40px;
            padding: 10px;
            border: 1px solid #ccc;
            border-radius: 20px;
            font-size: 16px;
            outline: none;
        }
        .search-btn {
            width: 100px; /* 调整按钮宽度 */
            height: 40px;
            background-color: #4e6ef2;
            color: #fff;
            border: none;
            border-radius: 20px;
            font-size: 16px;
            cursor: pointer;
            position: absolute;
            right: 10px;
        }
        .result-container {
            width: 100%;
            padding: 20px 0;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        .result-item {
            width: 90%; /* 修改为百分比宽度,更适应移动设备 */
            max-width: 800px; /* 设置最大宽度 */
            border: 1px solid #ccc;
            border-radius: 5px;
            padding: 10px;
            margin-top: 10px;
        }
        .result-title {
            font-size: 18px;
            color: #4e6ef2;
            text-decoration: none;
        }
        .result-desc {
            font-size: 14px;
            color: #333;
            margin-top: 5px;
        }
        .result-url {
            font-size: 12px;
            color: #666;
            margin-top: 5px;
        }
    </style>
</head>
<body>
<div class="container">
    <div class="title">boost 搜索引擎</div>
    <div class="search-container">
        <input type="text" class="search-input" value="输入搜索关键字..." onfocus="if(this.value=='输入搜索关键字...') this.value='';" onblur="if(this.value=='') this.value='输入搜索关键字...';">
        <button class="search-btn" onclick="Search()">搜索一下</button>
    </div>
    <div class="result-container">
        <!-- 搜索结果动态生成 -->
    </div>
</div>
<script>
    function Search() {
        let query = $(".search-input").val().trim();
        if (query == '') {
            return;
        }
        $.ajax({
            type: "GET",
            url: "/s?word=" + query,
            dataType: "json",
            success: function (data) {
                BuildHtml(data);
                $(".search-input").css("margin-top", "20px");
            }
        });
    }

    function BuildHtml(data) {
        let result_container = $(".result-container");
        result_container.empty();
        if (!data || data.length === 0) {
            result_container.append("<div>未找到相关结果</div>");
            return;
        }
        for (let elem of data) {
            let item = $("<div>", {class: "result-item"});
            let title = $("<a>", {class: "result-title", href: elem.url, text: elem.title, target: "_blank"});
            let desc = $("<div>", {class: "result-desc", text: elem.desc});
            let url = $("<div>", {class: "result-url", text: elem.url});
            title.appendTo(item);
            desc.appendTo(item);
            url.appendTo(item);
            item.appendTo(result_container);
        }
    }
</script>
</body>
</html>

index.hpp

#pragma once
#include <iostream>
#include <vector>
#include <string>
#include <fstream>
#include <unordered_map>
#include <mutex>
#include "util.hpp"
#include "log.hpp"

namespace ns_index{
    struct DocInfo{
        std::string title;//文档标题
        std::string content;//文档对应的去标签之后的内容
        std::string url;//官网文档url
        uint64_t doc_id; //文档的ID
    };

    struct InvertedElem{//倒排的元素
        uint64_t doc_id;
        std::string word;
        int weight;
    };
    //倒排拉链
    typedef std::vector<InvertedElem> InvertedList;

    class Index{
    private:
        //正排索引的数据结构用数组,数组的下标天然是文档的ID
        std::vector<DocInfo> forward_index;//正排索引
        //倒排索引一定是一个关键字和一组(个)InvertedElem对应(关键字和倒排拉链的对应关系)
        std::unordered_map<std::string , InvertedList>inverted_index;
    private:
        Index(){}//单例,但是不能delete
        Index(const Index&) = delete;
        Index& operator = (const Index&) = delete;
        static Index *instance;
         static std::mutex mtx;
    public:
        
        ~Index(){}
    public:
        static Index* GetInstance()//多线程环境会存在线程安全
        {
            if(nullptr==instance)
            {
                mtx.lock();
                if(nullptr==instance)
                {
                    instance = new Index();
                }
                mtx.unlock();
            }

            return instance;
        }


        //根据doc_id找到文档内容
        DocInfo* GetForwardIndex(uint64_t doc_id)
        {
            if(doc_id >= forward_index.size())
            {
                //std::cerr<<"doc_id out range,error!"<<std::endl;
                LOG2(DEBUG,"doc_id out range,error!");
                return nullptr;
            }
            return &forward_index[doc_id];
        }
        //根据关键字string,获得倒排拉链
        InvertedList *GetInvertedList(const std::string &word)
        {
            auto iter = inverted_index.find(word);
            if(iter==inverted_index.end())
            {
                //std::cerr<<word<<"have no InvertedList"<<std::endl;
                LOG2(WARNING,"用户没搜到");
                return nullptr;
            }
            return &(iter->second);
        }
        //根据去标签,格式化之后的文档,构建正排和倒排索引
        //data/raw_html/raw.txt
        bool BuildIndex(const std::string &input)//parse处理完毕的数据交给我(文件的路径)
        {
            std::ifstream in(input,std::ios::in | std::ios::binary);
            if(!in.is_open()){
                //std::cerr<<"sorry,"<<input<<"open error"<<std::endl;
                LOG2(FATAL,"open error");
                return false;
            }
            //读取文件
            std::string line;//每一行是一个文件
            int count = 0;
            while(std::getline(in,line))
            {
                //建立正排索引
                DocInfo* doc=BuildForwardIndex(line);
                if(doc==nullptr)
                {
                    //std::cerr<<"build"<<line<<"error"<<std::endl;//for debug
                    LOG2(DEBUG,"建立正排索引错误");
                    continue;
                }
                BuildInvertedIndex(*doc);
                count++;
                if(count % 50==0)
                {
                    //std::cout<< "当前已经建立的索引文档:"<<count <<std::endl;
                    LOG2(NORMAL,"当前已经建立的索引文档: " + std::to_string(count));
                }

            }
            return true;
        }
        private:
        DocInfo *BuildForwardIndex(const std::string &line)
        {
            //1. 解析line,字符串切分 line -> 3个string,(title、content、url)
           
            std::vector<std::string> results;
            const std::string sep ="\3";//行内分隔符
            ns_util::StringUtil::Split(line,&results,sep);

            if(results.size()!=3){
                return nullptr;
            }
            //2. 字符串进行填充到DoInfo
            DocInfo doc;
            doc.title = results[0];
            doc.content = results[1];
            doc.url = results[2];
            doc.doc_id = forward_index.size();//先进行保存,再插入,对应的id就是当前doc在vector下的下标
            //3. 插入到正排索引的vector
            forward_index.push_back(std::move(doc));//doc.html文件内容会比较大,避免拷贝应使用move
            return &forward_index.back();
        }
        bool BuildInvertedIndex(const DocInfo &doc)
        {
            //DocInfo(title,content,url,doc_id)
            //world -> 倒排拉链
            struct word_cnt{
                int title_cnt;
                int content_cnt;

                word_cnt():title_cnt(0),content_cnt(0){}
            };
            std::unordered_map<std::string,word_cnt> word_map;//用来暂存词频的映射表

            //对标题进行分词
            std::vector<std::string> title_words;
            ns_util::JiebaUtil::CutString2(doc.title,&title_words);//调用了CutString2
            //对标题进行词频统计
            for(auto &s : title_words){
                boost::to_lower(s);
                word_map[s].title_cnt++;
            }

            //对文档内容进行分词
            std::vector<std::string> content_words;
            ns_util::JiebaUtil::CutString2(doc.content,&content_words);
            //对内容进行词频统计
            for(auto &s : content_words){
                boost::to_lower(s);
                word_map[s].content_cnt++;
            }

#define X 10
#define Y 1
            //Hello.HELLO.hello(倒排索引的大小写要忽略)
            //根据文档内容,形成一个或者多个InvertedElem(倒排拉链)
            //因为当前我们是一个一个文档进行处理的,一个文档会包含多个“词”,都应当对应到当前的doc_id
            for(auto &word_pair : word_map){
                InvertedElem item;
                item.doc_id = doc.doc_id;
                item.word = word_pair.first;
                item.weight = X*word_pair.second.title_cnt + Y*word_pair.second.content_cnt;//相关性
                InvertedList &inverted_list = inverted_index[word_pair.first];
                inverted_list.push_back(std::move(item));
            }


            //1.需要对title && content都要先分词
            //title: 吃/葡萄
            //content:吃/葡萄/不吐/葡萄皮

            //词和文档的相关性(非常复杂,我们采用词频:在标题中出现的词,可以认为相关性更高一些,在内容中出现相关性低一些)
            //2.词频统计


            //知道了在文档中,标题和内容每个词出现的次数
            //3. 自定义相关性




            //jieba的使用————cppjieba
            
            return true;
        }
    };
    Index* Index::instance = nullptr;
    std::mutex Index::mtx;

}

log.hpp

#pragma once

#include <iostream>
#include <string>
#include <ctime>

#define NORMAL 1
#define WARNING 2
#define DEBUG 3
#define FATAL 4


#define LOG2(LEVEL,MESSAGE) log(#LEVEL,MESSAGE,__FILE__,__LINE__)
//@brief:时间戳转日期时间
static inline std::string getDateTimeFromTS(time_t ts) {
	if(ts<0) {
		return "";
	}
	struct tm tm = *localtime(&ts);
	static char time_str[32]{0};
	snprintf(time_str,sizeof(time_str),"%04d-%02d-%02d %02d:%02d:%02d",tm.tm_year+1900,tm.tm_mon+1,tm.tm_mday,tm.tm_hour,tm.tm_min,tm.tm_sec);
	return std::string(time_str);
}

void log(std::string level,std::string message,std::string file,int line)
{
    std::cout<<"["<<level<<"]"<<"["<<getDateTimeFromTS(time(nullptr))<<"]"<<"["<<message<<"]"<<"["<<file<<":"<<line<<"]"<<std::endl;
}

parser.cc(用于对网页的html文件切分且存储索引关系)

#include <iostream>
#include <string>
#include <vector>
#include <boost/filesystem.hpp>
#include "util.hpp"
#include "log.hpp"
const std::string src_path = "data/input";
const std::string output = "data/raw_html/raw.txt";//结尾没有'/'

typedef struct DocInfo{
    std::string title;//文档的标题
    std::string content;//文档内容
    std::string url;//该文档在官网中的url
}DocInfo_t;
//const & 输入
//* 输出
//& 输入输出
bool EnumFile(const std::string &src_path,std::vector<std::string> *file_list);
bool ParseHtml(const std::vector<std::string> &files_list,std::vector<DocInfo_t> *results);
bool SaveHtml(const std::vector<DocInfo_t> &results,const std::string &output);

int main()
{
    std::vector<std::string> files_list;
    //第一步,递归式的把每个html文件名带路径,保存到files_list中,方便后期进行一个一个的文件进行读取
    if(!EnumFile(src_path, &files_list))
    {
        //std::cerr<<"enum file error!" <<std::endl;
        LOG2(FATAL,"enum file error!");
        return 1;
    }
    //第二步,按照files_list读取每个文件的内容,并进行解析
    std::vector<DocInfo_t> results;
    if(!ParseHtml(files_list,&results))
    {
        //std::cerr <<"parse html error"<<std::endl;
        LOG2(FATAL,"parse html error");
        return 2;
    }
    //第三步,把解析完毕的各个文件的内容,写入到output中,按照\3作为每个文档的分割符
    if(!SaveHtml(results,output))
    {
        //std::cerr<<"save html error"<<std::endl;
        LOG2(FATAL,"save html error");
        return 3;
    }
    
    return 0;
}


bool EnumFile(const std::string &src_path,std::vector<std::string> *files_list)
{
    namespace fs = boost::filesystem;
    fs::path root_path(src_path);

    //判断路径是否存在,不存在就没必要往后走了
    if(!fs::exists(root_path))
    { 
        //std::cerr<< src_path<<"not exists"<<std::endl;
        LOG2(FATAL,"src_path not exists");
        return false;
    }
    //定义一个空的迭代器,用来进行判断递归结束
    fs::recursive_directory_iterator end;
    for(fs::recursive_directory_iterator iter(root_path);iter != end;iter++){
        //判断文件是否是普通文件(html是普通文件)
        if(!fs::is_regular_file(*iter))
        {
            continue;
        }
        if(iter->path().extension()!= ".html"){//判断文件路径名的后缀是否符合要求 path()提取路径字符串,是一个路径对象   ,extension()提取后缀(.以及之后的部分)
             continue;
        }
        //std::cout<<"debug: " <<iter->path().string()<<std::endl;
        //当前的路径一定是一个合法的,以.html结束的普通网页文件、
        files_list->push_back(iter->path().string());//将所有带路径的html保存到files_list,方便后续进行文本分析

    }
    return true;
}
static bool ParseTitle(const std::string &file,std::string *title){
    
    std::size_t begin = file.find("<title>");
    if(begin == std::string::npos){
        return false;
    }
    std::size_t end = file.find("</title>");
    if(end==std::string::npos)
    {
        return false;
    }
    begin+=std::string("<title>").size();

    if(begin>end){
        return false;
    }

    *title = file.substr(begin,end-begin);
    return true;
}
static bool ParseContent(const std::string &file,std::string *content){
    
    //去标签,基于一个简易的状态机编写
    enum status{
        LABLE,
        CONTENT
    };
    enum status s=LABLE;
    for(char c :file){
        switch(s)
        {
            case LABLE:
                if(c=='>') s= CONTENT;
                break;
            case CONTENT:
                if(c=='<') s= LABLE;
                else
                {
                    //我们不想要保留原始文件中的‘\n’,因为我们想用\n作为html解析之后文本的分隔符
                    if(c=='\n')c=' ';
                    content->push_back(c);
                }
                break;
            default:
                break;
        }

    }
    
    return true;
}
static bool ParseUrl(const std::string &file_path,std::string *url)
{
    std::string url_head =  "https://www.boost.org/doc/libs/1_78_0/doc/html";
    std::string url_tail = file_path.substr(src_path.size());//越过长度截取
    *url = url_head + url_tail;
    return true;
}

//for debug
static void ShowDoc(const DocInfo_t &doc)
{
    std::cout<<"title:"<<doc.title << std::endl;
    std::cout<<"content:"<<doc.content << std::endl;
    std::cout<<"url:"<<doc.url << std::endl;
}

bool ParseHtml(const std::vector<std::string> &files_list,std::vector<DocInfo_t> *results)
{
    for(const std::string &file : files_list)
    {
        //1.读取文件,Read()
        std::string result;
        if(!ns_util::FileUtil::ReadFile(file,&result)){
            continue;
        }
        //2.解析指定的文件,提取title
        DocInfo_t doc;
        if(!ParseTitle(result,&doc.title)){
            continue;
        }
        //3.解析指定的文件,提取content
        if(!ParseContent(result,&doc.content)){
            continue;
        }
        //4.解析指定的文件路径,构建url
        if(!ParseUrl(file,&doc.url)){
            continue;
        }
        //done,一定是完成了解析任务,当前文档的相关结果都保存在doc中
        results->push_back(std::move(doc)); //bug to do细节,本质会发生拷贝,效率可能会比较低 (move是细节)
        //std::cout<<1<<std::endl;
        //for debug
        //ShowDoc(doc);
        //break;
    }
    return true;
}
bool SaveHtml(const std::vector<DocInfo_t> &results,const std::string &output)
{   
#define SEP '\3'
    //按照二进制方式进行写入
    std::ofstream out(output,std::ios::out | std::ios::binary);
    if(!out.is_open()){
        //std::cerr<<"open "<<output <<"failed!"<<std::endl;
        LOG2(FATAL,"open output failed!");
        return false;
    }
    //就可以进行文件内容的写入了
    for(auto &item : results)
    {
        std::string out_string;
        out_string = item.title;
        out_string+=SEP;
        out_string +=item.content;
        out_string +=SEP;
        out_string +=item.url;
        out_string+='\n';

        out.write(out_string.c_str(),out_string.size());
    }

    out.close();
    return true;
}

//strstr 前闭后开

searcher.hpp

#pragma once
#include "index.hpp"
#include "util.hpp"
#include <algorithm>
#include <jsoncpp/json/json.h>
#include "log.hpp"
//#include <vector>
namespace ns_searcher{

    struct InvertedElemPrint{
        uint64_t doc_id;
        int weight;

        std::vector<std::string> words;
        InvertedElemPrint():doc_id(0),weight(0){}
        
    };

    class Searcher{
        private:
            ns_index::Index *index;
        public:
            Searcher(){}
            ~Searcher(){}
        public:
            void InitSearcher(const std::string &input)
            {
                //1. 获取或者创建index对象
                index = ns_index::Index::GetInstance();
                //std::cout <<"获取index单例成功..."<<std::endl;
                LOG2(NORMAL,"获取index单例成功...");
                //2. 根据index对象建立索引
                index->BuildIndex(input);//CutString
                //std::cout<<"建立正排和倒排索引成功..."<<std::endl;
                LOG2(NORMAL,"建立正排和倒排索引成功...");
            }
            //query:搜索关键字
            //json_string:返回给用户浏览器的搜索结果
            void Search(const std::string &query,std::string *json_string)
            {
                //1. [分词]:对我们的query进行按照searcher的要求进行分词
                std::vector<std::string> words;
                ns_util::JiebaUtil::CutString(query,&words);
                //2. [触发]:就是根据分词的各个“词,进行index查找”,建立index是忽略大小写,所以搜索关键字也需要
                //ns_index::InvertedList inverted_list_all;
                std::vector<InvertedElemPrint> inverted_list_all;
                std::unordered_map<uint64_t,InvertedElemPrint> tokens_map;
                for(std::string word : words)
                {
                    boost::to_lower(word);

                    ns_index::InvertedList *inverted_list = index->GetInvertedList(word);
                    if(nullptr == inverted_list)
                    {
                        continue;
                    }
                    //不完美的地方(去重)
                    //inverted_list_all.insert(inverted_list_all.end(),inverted_list->begin(),inverted_list->end());
                    for(const auto &elem : *inverted_list)
                    {
                        auto &item = tokens_map[elem.doc_id];
                        //item一定是doc_id相同的print节点
                        item.doc_id =elem.doc_id;
                        item.weight += elem.weight;
                        item.words.push_back(elem.word);
                    }
                }
                for(const auto&item : tokens_map){
                    inverted_list_all.push_back(std::move(item.second));
                    
                }
                //3. [合并排序]:汇总查找结果,按照相关性(weight)降序排序
                /*std::sort(inverted_list_all.begin(),inverted_list_all.end(),\
                [](const ns_index::InvertedElem &e1,const ns_index::InvertedElem &e2){
                    return e1.weight>e2.weight;
                }
                
                );
                */
               std::sort(inverted_list_all.begin(),inverted_list_all.end(),\
               [](const InvertedElemPrint&e1,const InvertedElemPrint& e2){
                return e1.weight >e2.weight;
               });
                //4. [构建]:根据查找出来的结果,构建json串————jsoncpp----通过jsoncpp完成序列化和反序列化
                Json::Value root;
                for(auto &item : inverted_list_all){
                    ns_index::DocInfo *doc = index->GetForwardIndex(item.doc_id);
                    if(nullptr == doc)
                    {
                        continue;
                    }
                    Json::Value elem;
                    elem["title"] = doc->title;
                    elem["desc"] = GetDesc(doc->content,item.words[0]);  //content是文档的去标签的结果,但是不是我们想要的,我们要的是一部分
                    elem["url"] = doc->url;

                    //foe debug
                    //elem["id"]= (int)item.doc_id;//doc_id是64位的uint64_t
                    //elem["weight"] = item.weight;
                
                    root.append(elem);
                }   
                //Json::StyledWriter writer;
                Json::FastWriter writer;
                *json_string = writer.write(root);
            }

            std::string GetDesc(const std::string &html_content,const std::string &word)
            {
                //找到word在html_content中的首次出现,然后往前找50个字节(如果没有,从begin开始),往后找100个字节(如果没有,到end就可以),截取出这部分内容
                const std::size_t prev_step = 50;
                const std::size_t next_step =100;
                //1. 找到首次出现
                auto iter = std::search(html_content.begin(),html_content.end(),word.begin(),word.end(),[](int x,int y){
                    return (std::tolower(x)==std::tolower(y));
                });

                if(iter == html_content.end())
                {
                    return "None1";
                }
                std::size_t pos = std::distance(html_content.begin(),iter);
                /*std::size_t pos = html_content.find(word);
                if(pos == std::string::npos){
                    return "None1";//这种情况是不存在的
                }*/
                //2. 获取start,end           //这里有一个大坑,就是std::size_t是一个无符号数,无符号数相减为正数
                std::size_t start = 0;
                std::size_t end = html_content.size() - 1;
                //如果之前有50个字符,就更新开始位置
                if(pos  >start+ prev_step) start = pos -prev_step;//换成加法
                if(pos + next_step <end) end = pos + next_step;
                //3. 截取子串,return
                if(start >= end)return "None2";
                 
                std::string desc = html_content.substr(start,end-start+1);
                std::string result="..." + desc + "...";
                return result;
            
            }
         
    };


}

util.hpp

#pragma once
#include <iostream>
#include <string>
#include <fstream>
#include <vector>
#include "boost_1_84_0/boost/algorithm/string.hpp"
#include "../cppjieba/include/cppjieba/Jieba.hpp"
//#include "cppjieba/jieba"
#include "log.hpp"
#include <mutex>
#include <unordered_map>
namespace ns_util{
    class FileUtil
    {
    public:
        static bool ReadFile(const std::string &file_path,std::string *out)
        {
            std::ifstream in(file_path,std::ios::in);
            if(!in.is_open())
            {
                //std::cerr << "open_file" << file_path <<"error" <<std::endl;
                LOG2(FATAL,"open_file error");
                return false;
            }
    
            std::string line;
            while(std::getline(in,line)){//如何理解getline读取到文件结束呢??getline到返回值是一个&,while(bool),本质是因为重载了强制类型转换
                *out += line;
            }
            in.close();
            return true;
        }

    };
    class StringUtil{
    public:
        static void Split(const std::string&target,std::vector<std::string>*out,const std::string& sep)
        {
            //boost split
            boost::split(*out,target,boost::is_any_of(sep),boost::token_compress_on);
        }
    };
    const char* const DICT_PATH = "./dict/jieba.dict.utf8";
    const char* const HMM_PATH = "./dict/hmm_model.utf8";
    const char* const USER_DICT_PATH = "./dict/user.dict.utf8";
    const char* const IDF_PATH = "./dict/idf.utf8";
    const char* const STOP_WORD_PATH = "./dict/stop_words.utf8";
    
    class JiebaUtil
    {
    private:
        //static cppjieba::Jieba jieba;
        cppjieba::Jieba jieba;
        std::unordered_map<std::string,bool> stop_words;    
    private:
        JiebaUtil():jieba(DICT_PATH,HMM_PATH,USER_DICT_PATH,IDF_PATH,STOP_WORD_PATH)
        {}
        JiebaUtil(const JiebaUtil&)=delete;
        JiebaUtil& operator=(JiebaUtil const&)=delete;
        static JiebaUtil *instance;
    public:
        static JiebaUtil*get_instance()
        {
            static std::mutex mtx;
            if(nullptr==instance){
                mtx.lock();
                if(nullptr ==instance){
                    instance = new JiebaUtil();
                    instance->InitJiebaUtil();
                }
                mtx.unlock();

            }
            return instance;
        }
        void InitJiebaUtil()
        {
            std::ifstream in(STOP_WORD_PATH);
            if(!in.is_open())
            {
                LOG2(FATAL,"load stop words fill error");
                return ;
            }
            std::string line;
            while(std::getline(in,line))
            {
                stop_words.insert({line,true});

            }
            in.close();
        }
        void CutStringHelper(const std::string &src,std::vector<std::string>*out)
        {
           
            
            jieba.CutForSearch(src,*out);
            std::vector<std::string> v(*out);

            //  //for debug
            // for(auto e : v)
            // {
            //     std::cout<<"暂停词测试存储 v:"<<e<<"----"<<std::endl;
            // }
            


            for(auto iter=out->begin();iter!=out->end();){
                auto it =stop_words.find(*iter);
                if(it!=stop_words.end())
                {
                    //说明当前的string是暂停词,需要去掉
                    iter = out->erase(iter);
                }
                else
                {
                    iter++;
                }
            }

            if(out->empty())
            {
                //std::cout<< "out为空"<<std::endl;
                *out = v;

            }
            
            //debug

            // std::cout<< out->empty()<<std::endl;
            // for(auto e : *out)
            // {
            //     std::cout<<"暂停词测试out 后:"<<e<<"----"<<std::endl;
            // }
            
        }
        void CutString_has_stop_words(const std::string &src,std::vector<std::string>*out)
        {
            jieba.CutForSearch(src,*out);
        }
    public:

        static void CutString(const std::string &src,std::vector<std::string> *out)
        {
            //debug
            //std::cout<< "CutStringHelper" << std::endl;

            ns_util::JiebaUtil::get_instance()->CutStringHelper(src,out);
            //jieba.CutForSearch(src,*out);
        }

        static void CutString2(const std::string &src,std::vector<std::string> *out)
        {

            //debug
            //std::cout<< "CutString2()" << std::endl;
            ns_util::JiebaUtil::get_instance()->CutString_has_stop_words(src,out);

        
 
        }
    
    //cppjieba::Jieba JiebaUtil::jieba(DICT_PATH,HMM_PATH,USER_DICT_PATH,IDF_PATH,STOP_WORD_PATH);
    };
    JiebaUtil *JiebaUtil::instance = nullptr;
//加static是因为这个函数要被外部使用,加了static可以不创建对象就可以使用
}

http_server.cc(用于启动服务器和搜索引擎)

#include "searcher.hpp"
#include "httplib.h"
#include "../http.hpp"

const std::string root_path = "./wwwroot";
const std::string input = "data/raw_html/raw.txt";

ns_searcher::Searcher search;


std::string RequestStr(const HttpRequest &req)
{
    std::stringstream ss;
    ss << req._method << " " << req._path << " " << req._version << "\r\n";
    for (auto it : req._params)
    {
        ss << it.first << ": " << it.second << "\r\n";
        DBG_LOG("RequestStr_params: first:%s ,second:%s", it.first, it.second);
    }
    for (auto it : req._headers)
    {
        ss << it.first << ": " << it.second << "\r\n";
        DBG_LOG("RequestStr_headers: first:%s ,second:%s", it.first.c_str(), it.second.c_str());
    }

    ss << "\r\n";
    ss << req._body;
    return ss.str();
}
void Hello(const HttpRequest &req, HttpResponse *rsp)
{
    if (!req.HasParam("word"))
    {
        rsp->SetContent("必须要有搜索关键字!", "text/plain; charset=utf-8");
        return;
    }

    // rsp.set_content("hello world!你好世界\n","text/plain; charset=utf-8");

    const std::string word = req.GetParam("word"); // 获取名为word的参数值
    // debug
    // std::cout<<"test:"<<word<<std::endl;

    // std::cout<<"用户在搜索:"<<word<<std::endl;
    //LOG2(NORMAL, "用户搜索的:" + word);
    std::string json_string;
    search.Search(word, &json_string);
    rsp->SetContent(json_string, "application/json");
    //rsp->SetContent(RequestStr(req), "text/plain");
}

void Login(const HttpRequest &req, HttpResponse *rsp)
{

  
    rsp->SetContent(RequestStr(req),"text/plain");
}

void PutFile(const HttpRequest &req, HttpResponse *rsp)
{
    rsp->SetContent(RequestStr(req), "text/plain");
}

void DelFile(const HttpRequest &req, HttpResponse *rsp)
{
    rsp->SetContent(RequestStr(req), "text/plain");
}
int main()       
{
  
    search.InitSearcher(input);
    HttpServer server(8085);
    server.SetThreadCount(3);
    server.SetBaseDir(root_path); // 设置静态资源根目录,告诉服务器有静态资源请求到来,需要到哪里去找资源路径
    server.Get("/s", Hello);
    server.Post("/login", Login);
    server.Put("/1234.txt", PutFile);
    server.Delete("/1234.txt", DelFile);
    server.Listen();
    

    return 0;
}

高并发服务器部分

http.hpp


#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <regex>
#include <sys/stat.h>
#include "../server.hpp"

#define DEFALT_TIMEOUT 10

std::unordered_map<int, std::string> _statu_msg = {
    {100,  "Continue"},
    {101,  "Switching Protocol"},
    {102,  "Processing"},
    {103,  "Early Hints"},
    {200,  "OK"},
    {201,  "Created"},
    {202,  "Accepted"},
    {203,  "Non-Authoritative Information"},
    {204,  "No Content"},
    {205,  "Reset Content"},
    {206,  "Partial Content"},
    {207,  "Multi-Status"},
    {208,  "Already Reported"},
    {226,  "IM Used"},
    {300,  "Multiple Choice"},
    {301,  "Moved Permanently"},
    {302,  "Found"},
    {303,  "See Other"},
    {304,  "Not Modified"},
    {305,  "Use Proxy"},
    {306,  "unused"},
    {307,  "Temporary Redirect"},
    {308,  "Permanent Redirect"},
    {400,  "Bad Request"},
    {401,  "Unauthorized"},
    {402,  "Payment Required"},
    {403,  "Forbidden"},
    {404,  "Not Found"},
    {405,  "Method Not Allowed"},
    {406,  "Not Acceptable"},
    {407,  "Proxy Authentication Required"},
    {408,  "Request Timeout"},
    {409,  "Conflict"},
    {410,  "Gone"},
    {411,  "Length Required"},
    {412,  "Precondition Failed"},
    {413,  "Payload Too Large"},
    {414,  "URI Too Long"},
    {415,  "Unsupported Media Type"},
    {416,  "Range Not Satisfiable"},
    {417,  "Expectation Failed"},
    {418,  "I'm a teapot"},
    {421,  "Misdirected Request"},
    {422,  "Unprocessable Entity"},
    {423,  "Locked"},
    {424,  "Failed Dependency"},
    {425,  "Too Early"},
    {426,  "Upgrade Required"},
    {428,  "Precondition Required"},
    {429,  "Too Many Requests"},
    {431,  "Request Header Fields Too Large"},
    {451,  "Unavailable For Legal Reasons"},
    {501,  "Not Implemented"},
    {502,  "Bad Gateway"},
    {503,  "Service Unavailable"},
    {504,  "Gateway Timeout"},
    {505,  "HTTP Version Not Supported"},
    {506,  "Variant Also Negotiates"},
    {507,  "Insufficient Storage"},
    {508,  "Loop Detected"},
    {510,  "Not Extended"},
    {511,  "Network Authentication Required"}
};

std::unordered_map<std::string, std::string> _mime_msg = {
    {".aac",        "audio/aac"},
    {".abw",        "application/x-abiword"},
    {".arc",        "application/x-freearc"},
    {".avi",        "video/x-msvideo"},
    {".azw",        "application/vnd.amazon.ebook"},
    {".bin",        "application/octet-stream"},
    {".bmp",        "image/bmp"},
    {".bz",         "application/x-bzip"},
    {".bz2",        "application/x-bzip2"},
    {".csh",        "application/x-csh"},
    {".css",        "text/css"},
    {".csv",        "text/csv"},
    {".doc",        "application/msword"},
    {".docx",       "application/vnd.openxmlformats-officedocument.wordprocessingml.document"},
    {".eot",        "application/vnd.ms-fontobject"},
    {".epub",       "application/epub+zip"},
    {".gif",        "image/gif"},
    {".htm",        "text/html"},
    {".html",       "text/html"},
    {".ico",        "image/vnd.microsoft.icon"},
    {".ics",        "text/calendar"},
    {".jar",        "application/java-archive"},
    {".jpeg",       "image/jpeg"},
    {".jpg",        "image/jpeg"},
    {".js",         "text/javascript"},
    {".json",       "application/json"},
    {".jsonld",     "application/ld+json"},
    {".mid",        "audio/midi"},
    {".midi",       "audio/x-midi"},
    {".mjs",        "text/javascript"},
    {".mp3",        "audio/mpeg"},
    {".mpeg",       "video/mpeg"},
    {".mpkg",       "application/vnd.apple.installer+xml"},
    {".odp",        "application/vnd.oasis.opendocument.presentation"},
    {".ods",        "application/vnd.oasis.opendocument.spreadsheet"},
    {".odt",        "application/vnd.oasis.opendocument.text"},
    {".oga",        "audio/ogg"},
    {".ogv",        "video/ogg"},
    {".ogx",        "application/ogg"},
    {".otf",        "font/otf"},
    {".png",        "image/png"},
    {".pdf",        "application/pdf"},
    {".ppt",        "application/vnd.ms-powerpoint"},
    {".pptx",       "application/vnd.openxmlformats-officedocument.presentationml.presentation"},
    {".rar",        "application/x-rar-compressed"},
    {".rtf",        "application/rtf"},
    {".sh",         "application/x-sh"},
    {".svg",        "image/svg+xml"},
    {".swf",        "application/x-shockwave-flash"},
    {".tar",        "application/x-tar"},
    {".tif",        "image/tiff"},
    {".tiff",       "image/tiff"},
    {".ttf",        "font/ttf"},
    {".txt",        "text/plain"},
    {".vsd",        "application/vnd.visio"},
    {".wav",        "audio/wav"},
    {".weba",       "audio/webm"},
    {".webm",       "video/webm"},
    {".webp",       "image/webp"},
    {".woff",       "font/woff"},
    {".woff2",      "font/woff2"},
    {".xhtml",      "application/xhtml+xml"},
    {".xls",        "application/vnd.ms-excel"},
    {".xlsx",       "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"},
    {".xml",        "application/xml"},
    {".xul",        "application/vnd.mozilla.xul+xml"},
    {".zip",        "application/zip"},
    {".3gp",        "video/3gpp"},
    {".3g2",        "video/3gpp2"},
    {".7z",         "application/x-7z-compressed"}
};

class Util {
    public:
        //字符串分割函数,将src字符串按照sep字符进行分割,得到的各个字串放到arry中,最终返回字串的数量
        static size_t Split(const std::string &src, const std::string &sep, std::vector<std::string> *arry) {
            size_t offset = 0;
            // 有10个字符,offset是查找的起始位置,范围应该是0~9,offset==10就代表已经越界了
            while(offset < src.size()) {
                size_t pos = src.find(sep, offset);//在src字符串偏移量offset处,开始向后查找sep字符/字串,返回查找到的位置
                if (pos == std::string::npos) {//没有找到特定的字符
                    //将剩余的部分当作一个字串,放入arry中
                    if(pos == src.size()) break;
                    arry->push_back(src.substr(offset));
                    return arry->size();
                }
                if (pos == offset) {
                    offset = pos + sep.size();
                    continue;//当前字串是一个空的,没有内容
                }
                arry->push_back(src.substr(offset, pos - offset));
                offset = pos + sep.size();
            }
            return arry->size();
        }
        //读取文件的所有内容,将读取的内容放到一个Buffer中
        static bool ReadFile(const std::string &filename, std::string *buf) {
            std::ifstream ifs(filename, std::ios::binary);
            if (ifs.is_open() == false) {
                printf("OPEN %s FILE FAILED!!", filename.c_str());
                return false;
            }
            size_t fsize = 0;
            ifs.seekg(0, ifs.end);//跳转读写位置到末尾
            fsize = ifs.tellg();  //获取当前读写位置相对于起始位置的偏移量,从末尾偏移刚好就是文件大小
            ifs.seekg(0, ifs.beg);//跳转到起始位置
            buf->resize(fsize); //开辟文件大小的空间
            ifs.read(&(*buf)[0], fsize);
            if (ifs.good() == false) {
                printf("READ %s FILE FAILED!!", filename.c_str());
                ifs.close();
                return false;
            }
            ifs.close();
            return true;
        }
        //向文件写入数据
        static bool WriteFile(const std::string &filename, const std::string &buf) {
            std::ofstream ofs(filename, std::ios::binary | std::ios::trunc);
            if (ofs.is_open() == false) {
                printf("OPEN %s FILE FAILED!!", filename.c_str());
                return false;
            }
            ofs.write(buf.c_str(), buf.size());
            if (ofs.good() == false) {
                ERR_LOG("WRITE %s FILE FAILED!", filename.c_str());
                ofs.close();    
                return false;
            }
            ofs.close();
            return true;
        }
        //URL编码,避免URL中资源路径与查询字符串中的特殊字符与HTTP请求中特殊字符产生歧义
        //编码格式:将特殊字符的ascii值,转换为两个16进制字符,前缀%   C++ -> C%2B%2B
        //  不编码的特殊字符: RFC3986文档规定 . - _ ~ 字母,数字属于绝对不编码字符
        //RFC3986文档规定,编码格式 %HH 
        //W3C标准中规定,查询字符串中的空格,需要编码为+, 解码则是+转空格
        static std::string UrlEncode(const std::string url, bool convert_space_to_plus) {
            std::string res;
            for (auto &c : url) {
                if (c == '.' || c == '-' || c == '_' || c == '~' || isalnum(c)) {
                    res += c;
                    continue;
                }
                if (c == ' ' && convert_space_to_plus == true) {
                    res += '+';
                    continue;
                }
                //剩下的字符都是需要编码成为 %HH 格式
                char tmp[4] = {0};
                //snprintf 与 printf比较类似,都是格式化字符串,只不过一个是打印,一个是放到一块空间中
                snprintf(tmp, 4, "%%%02X", c);
                res += tmp;
            }
            return res;
        }
        static char HEXTOI(char c) {
            if (c >= '0' && c <= '9') {
                return c - '0';
            }else if (c >= 'a' && c <= 'z') {
                return c - 'a' + 10;
            }else if (c >= 'A' && c <= 'Z') {
                return c - 'A' + 10;
            }
            return -1; 
        }
        static std::string UrlDecode(const std::string url, bool convert_plus_to_space) {
            //遇到了%,则将紧随其后的2个字符,转换为数字,第一个数字左移4位,然后加上第二个数字  + -> 2b  %2b->2 << 4 + 11
            std::string res;
            for (int i = 0; i < url.size(); i++) {
                if (url[i] == '+' && convert_plus_to_space == true) {
                    res += ' ';
                    continue;
                }
                if (url[i] == '%' && (i + 2) < url.size()) {
                    char v1 = HEXTOI(url[i + 1]);
                    char v2 = HEXTOI(url[i + 2]);
                    char v = v1 * 16 + v2;
                    res += v;
                    i += 2;
                    continue;
                }
                res += url[i];
            }
            return res;
        }
        //响应状态码的描述信息获取
        static std::string StatuDesc(int statu) {
            
            auto it = _statu_msg.find(statu);
            if (it != _statu_msg.end()) {
                return it->second;
            }
            return "Unknow";
        }
        //根据文件后缀名获取文件mime
        static std::string ExtMime(const std::string &filename) {
            
            // a.b.txt  先获取文件扩展名
            size_t pos = filename.find_last_of('.');
            if (pos == std::string::npos) {
                return "application/octet-stream";
            }
            //根据扩展名,获取mime
            std::string ext = filename.substr(pos);
            auto it = _mime_msg.find(ext);
            if (it == _mime_msg.end()) {
                return "application/octet-stream";
            }
            return it->second;
        }
        //判断一个文件是否是一个目录
        static bool IsDirectory(const std::string &filename) {
            struct stat st;
            int ret = stat(filename.c_str(), &st);
            if (ret < 0) {
                return false;
            }
            return S_ISDIR(st.st_mode);
        }
        //判断一个文件是否是一个普通文件
        static bool IsRegular(const std::string &filename) {
            struct stat st;
            int ret = stat(filename.c_str(), &st);
            if (ret < 0) {
                return false;
            }
            return S_ISREG(st.st_mode);
        }
        //http请求的资源路径有效性判断
        // /index.html  --- 前边的/叫做相对根目录  映射的是某个服务器上的子目录
        // 想表达的意思就是,客户端只能请求相对根目录中的资源,其他地方的资源都不予理会
        // /../login, 这个路径中的..会让路径的查找跑到相对根目录之外,这是不合理的,不安全的
        static bool ValidPath(const std::string &path) {
            //思想:按照/进行路径分割,根据有多少子目录,计算目录深度,有多少层,深度不能小于0
            std::vector<std::string> subdir;
            Split(path, "/", &subdir);
            int level = 0;
            for (auto &dir : subdir) {
                if (dir == "..") {
                    level--; //任意一层走出相对根目录,就认为有问题
                    if (level < 0) return false;
                    continue;
                }
                level++;
            }
            return true;
        }
};

class HttpRequest {
    public:
        std::string _method;      //请求方法
        std::string _path;        //资源路径
        std::string _version;     //协议版本
        std::string _body;        //请求正文
        std::smatch _matches;     //资源路径的正则提取数据
        std::unordered_map<std::string, std::string> _headers;  //头部字段
        std::unordered_map<std::string, std::string> _params;   //查询字符串
    public:
        HttpRequest():_version("HTTP/1.1") {}
        void ReSet() {
            _method.clear();
            _path.clear();
            _version = "HTTP/1.1";
            _body.clear();
            std::smatch match;
            _matches.swap(match);
            _headers.clear();
            _params.clear();
        }
        //插入头部字段
        void SetHeader(const std::string &key, const std::string &val) {
            _headers.insert(std::make_pair(key, val));
        }
        //判断是否存在指定头部字段
        bool HasHeader(const std::string &key) const {
            auto it = _headers.find(key);
            if (it == _headers.end()) {
                return false;
            }
            return true;
        }
        //获取指定头部字段的值
        std::string GetHeader(const std::string &key) const {
            auto it = _headers.find(key);
            if (it == _headers.end()) {
                return "";
            }
            return it->second;
        }
        //插入查询字符串
        void SetParam(const std::string &key, const std::string &val) {
            _params.insert(std::make_pair(key, val));
        }
        //判断是否有某个指定的查询字符串
        bool HasParam(const std::string &key) const {
            auto it = _params.find(key);
            if (it == _params.end()) {
                return false;
            }
            return true;
        }
        //获取指定的查询字符串
        std::string GetParam(const std::string &key) const {
            auto it = _params.find(key);
            if (it == _params.end()) {
                return "";
            }
            return it->second;
        }
        //获取正文长度
        size_t ContentLength() const {
            // Content-Length: 1234\r\n
            bool ret = HasHeader("Content-Length");
            if (ret == false) {
                return 0;
            }
            std::string clen = GetHeader("Content-Length");
            return std::stol(clen);
        }
        //判断是否是短链接
        bool Close() const {
            // 没有Connection字段,或者有Connection但是值是close,则都是短链接,否则就是长连接
            if (HasHeader("Connection") == true && GetHeader("Connection") == "keep-alive") {
                return false;
            }
            return true;
        }
};

class HttpResponse {
    public:
        int _statu;
        bool _redirect_flag;
        std::string _body;
        std::string _redirect_url;
        std::unordered_map<std::string, std::string> _headers;
    public:
        HttpResponse():_redirect_flag(false), _statu(200) {}
        HttpResponse(int statu):_redirect_flag(false), _statu(statu) {} 
        void ReSet() {
            _statu = 200;
            _redirect_flag = false;
            _body.clear();
            _redirect_url.clear();
            _headers.clear();
        }
        //插入头部字段
        void SetHeader(const std::string &key, const std::string &val) {
            _headers.insert(std::make_pair(key, val));
        }
        //判断是否存在指定头部字段
        bool HasHeader(const std::string &key) {
            auto it = _headers.find(key);
            if (it == _headers.end()) {
                return false;
            }
            return true;
        }
        //获取指定头部字段的值
        std::string GetHeader(const std::string &key) {
            auto it = _headers.find(key);
            if (it == _headers.end()) {
                return "";
            }
            return it->second;
        }
        void SetContent(const std::string &body,  const std::string &type = "text/html") {
            _body = body;
            SetHeader("Content-Type", type);
        }
        void SetRedirect(const std::string &url, int statu = 302) {
            _statu = statu;
            _redirect_flag = true;
            _redirect_url = url;
        }
        //判断是否是短链接
        bool Close() {
            // 没有Connection字段,或者有Connection但是值是close,则都是短链接,否则就是长连接
            if (HasHeader("Connection") == true && GetHeader("Connection") == "keep-alive") {
                return false;
            }
            return true;
        }
};

typedef enum {
    RECV_HTTP_ERROR,
    RECV_HTTP_LINE,
    RECV_HTTP_HEAD,
    RECV_HTTP_BODY,
    RECV_HTTP_OVER
}HttpRecvStatu;

#define MAX_LINE 8192
class HttpContext {
    private:
        int _resp_statu; //响应状态码
        HttpRecvStatu _recv_statu; //当前接收及解析的阶段状态
        HttpRequest _request;  //已经解析得到的请求信息
    private:
        bool ParseHttpLine(const std::string &line) {
            std::smatch matches;
            std::regex e("(GET|HEAD|POST|PUT|DELETE) ([^?]*)(?:\\?(.*))? (HTTP/1\\.[01])(?:\n|\r\n)?", std::regex::icase);
            bool ret = std::regex_match(line, matches, e);
            if (ret == false) {
                _recv_statu = RECV_HTTP_ERROR;
                _resp_statu = 400;//BAD REQUEST
                return false;
            }
            //0 : GET /bitejiuyeke/login?user=xiaoming&pass=123123 HTTP/1.1
            //1 : GET
            //2 : /bitejiuyeke/login
            //3 : user=xiaoming&pass=123123
            //4 : HTTP/1.1
            //请求方法的获取
            _request._method = matches[1];
            std::transform(_request._method.begin(), _request._method.end(), _request._method.begin(), ::toupper);
            //资源路径的获取,需要进行URL解码操作,但是不需要+转空格
            _request._path = Util::UrlDecode(matches[2], false);
            //协议版本的获取
            _request._version = matches[4];
            //查询字符串的获取与处理
            std::vector<std::string> query_string_arry;
            std::string query_string = matches[3];
            //查询字符串的格式 key=val&key=val....., 先以 & 符号进行分割,得到各个字串
            Util::Split(query_string, "&", &query_string_arry);
            //针对各个字串,以 = 符号进行分割,得到key 和val, 得到之后也需要进行URL解码
            for (auto &str : query_string_arry) {
                size_t pos = str.find("=");
                if (pos == std::string::npos) {
                    _recv_statu = RECV_HTTP_ERROR;
                    _resp_statu = 400;//BAD REQUEST
                    return false;
                }
                std::string key = Util::UrlDecode(str.substr(0, pos), true);  
                std::string val = Util::UrlDecode(str.substr(pos + 1), true);
                _request.SetParam(key, val);
            }
            return true;
        }
        bool RecvHttpLine(Buffer *buf) {
            if (_recv_statu != RECV_HTTP_LINE) return false;
            //1. 获取一行数据,带有末尾的换行 
            std::string line = buf->GetLineAndPop();
            //2. 需要考虑的一些要素:缓冲区中的数据不足一行, 获取的一行数据超大
            if (line.size() == 0) {
                //缓冲区中的数据不足一行,则需要判断缓冲区的可读数据长度,如果很长了都不足一行,这是有问题的
                if (buf->ReadAbleSize() > MAX_LINE) {
                    _recv_statu = RECV_HTTP_ERROR;
                    _resp_statu = 414;//URI TOO LONG
                    return false;
                }
                //缓冲区中数据不足一行,但是也不多,就等等新数据的到来
                return true;
            }
            if (line.size() > MAX_LINE) {
                _recv_statu = RECV_HTTP_ERROR;
                _resp_statu = 414;//URI TOO LONG
                return false;
            }
            bool ret = ParseHttpLine(line);
            if (ret == false) {
                return false;
            }
            //首行处理完毕,进入头部获取阶段
            _recv_statu = RECV_HTTP_HEAD;
            return true;
        }
        bool RecvHttpHead(Buffer *buf) {
            if (_recv_statu != RECV_HTTP_HEAD) return false;
            //一行一行取出数据,直到遇到空行为止, 头部的格式 key: val\r\nkey: val\r\n....
            while(1){
                std::string line = buf->GetLineAndPop();
                //2. 需要考虑的一些要素:缓冲区中的数据不足一行, 获取的一行数据超大
                if (line.size() == 0) {
                    //缓冲区中的数据不足一行,则需要判断缓冲区的可读数据长度,如果很长了都不足一行,这是有问题的
                    if (buf->ReadAbleSize() > MAX_LINE) {
                        _recv_statu = RECV_HTTP_ERROR;
                        _resp_statu = 414;//URI TOO LONG
                        return false;
                    }
                    //缓冲区中数据不足一行,但是也不多,就等等新数据的到来
                    return true;
                }
                if (line.size() > MAX_LINE) {
                    _recv_statu = RECV_HTTP_ERROR;
                    _resp_statu = 414;//URI TOO LONG
                    return false;
                }
                if (line == "\n" || line == "\r\n") {
                    break;
                }
                bool ret = ParseHttpHead(line);
                if (ret == false) {
                    return false;
                }
            }
            //头部处理完毕,进入正文获取阶段
            _recv_statu = RECV_HTTP_BODY;
            return true;
        }
        bool ParseHttpHead(std::string &line) {
            //key: val\r\nkey: val\r\n....
            if (line.back() == '\n') line.pop_back();//末尾是换行则去掉换行字符
            if (line.back() == '\r') line.pop_back();//末尾是回车则去掉回车字符
            size_t pos = line.find(": ");
            if (pos == std::string::npos) {
                _recv_statu = RECV_HTTP_ERROR;
                _resp_statu = 400;//
                return false;
            }
            std::string key = line.substr(0, pos);  
            std::string val = line.substr(pos + 2);
            _request.SetHeader(key, val);
            return true;
        }
        bool RecvHttpBody(Buffer *buf) {
            if (_recv_statu != RECV_HTTP_BODY) return false;
            //1. 获取正文长度
            size_t content_length = _request.ContentLength();
            if (content_length == 0) {
                //没有正文,则请求接收解析完毕
                _recv_statu = RECV_HTTP_OVER;
                return true;
            }
            //2. 当前已经接收了多少正文,其实就是往  _request._body 中放了多少数据了
            size_t real_len = content_length - _request._body.size();//实际还需要接收的正文长度
            //3. 接收正文放到body中,但是也要考虑当前缓冲区中的数据,是否是全部的正文
            //  3.1 缓冲区中数据,包含了当前请求的所有正文,则取出所需的数据
            if (buf->ReadAbleSize() >= real_len) {
                _request._body.append(buf->ReadPosition(), real_len);
                buf->MoveReadOffset(real_len);
                _recv_statu = RECV_HTTP_OVER;
                return true;
            }
            //  3.2 缓冲区中数据,无法满足当前正文的需要,数据不足,取出数据,然后等待新数据到来
            _request._body.append(buf->ReadPosition(), buf->ReadAbleSize());
            buf->MoveReadOffset(buf->ReadAbleSize());
            return true;
        }
    public:
        HttpContext():_resp_statu(200), _recv_statu(RECV_HTTP_LINE) {}
        void ReSet() {
            _resp_statu = 200;
            _recv_statu = RECV_HTTP_LINE;
            _request.ReSet();
        }
        int RespStatu() { return _resp_statu; }
        HttpRecvStatu RecvStatu() { return _recv_statu; }
        HttpRequest &Request() { return _request; }
        //接收并解析HTTP请求
        void RecvHttpRequest(Buffer *buf) {
            //不同的状态,做不同的事情,但是这里不要break, 因为处理完请求行后,应该立即处理头部,而不是退出等新数据
            switch(_recv_statu) {
                case RECV_HTTP_LINE: RecvHttpLine(buf);
                case RECV_HTTP_HEAD: RecvHttpHead(buf);
                case RECV_HTTP_BODY: RecvHttpBody(buf);
            }
            return;
        }
};


class HttpServer {
    private:
        using Handler = std::function<void(const HttpRequest &, HttpResponse *)>;
        using Handlers = std::vector<std::pair<std::regex, Handler>>;
        Handlers _get_route;
        Handlers _post_route;
        Handlers _put_route;
        Handlers _delete_route;
        std::string _basedir; //静态资源根目录
        TcpServer _server;
    private:
        void ErrorHandler(const HttpRequest &req, HttpResponse *rsp) {
            //1. 组织一个错误展示页面
            std::string body;
            body += "<html>";
            body += "<head>";
            body += "<meta http-equiv='Content-Type' content='text/html;charset=utf-8'>";
            body += "</head>";
            body += "<body>";
            body += "<h1>";
            body += std::to_string(rsp->_statu);
            body += " ";
            body += Util::StatuDesc(rsp->_statu);
            body += "</h1>";
            body += "</body>";
            body += "</html>";
            //2. 将页面数据,当作响应正文,放入rsp中
            rsp->SetContent(body, "text/html");
        }
        //将HttpResponse中的要素按照http协议格式进行组织,发送
        void WriteReponse(const PtrConnection &conn, const HttpRequest &req, HttpResponse &rsp) {
            //1. 先完善头部字段
            if (req.Close() == true) {
                rsp.SetHeader("Connection", "close");
            }else {
                rsp.SetHeader("Connection", "keep-alive");
            }
            if (rsp._body.empty() == false && rsp.HasHeader("Content-Length") == false) {
                rsp.SetHeader("Content-Length", std::to_string(rsp._body.size()));
            }
            if (rsp._body.empty() == false && rsp.HasHeader("Content-Type") == false) {
                rsp.SetHeader("Content-Type", "application/octet-stream");
            }
            if (rsp._redirect_flag == true) {
                rsp.SetHeader("Location", rsp._redirect_url);
            }
            //2. 将rsp中的要素,按照http协议格式进行组织
            std::stringstream rsp_str;
            rsp_str << req._version << " " << std::to_string(rsp._statu) << " " << Util::StatuDesc(rsp._statu) << "\r\n";
            for (auto &head : rsp._headers) {
                rsp_str << head.first << ": " << head.second << "\r\n";
            }
            rsp_str << "\r\n";
            rsp_str << rsp._body;
            //3. 发送数据
            conn->Send(rsp_str.str().c_str(), rsp_str.str().size());
        }
        bool IsFileHandler(const HttpRequest &req) {
            // 1. 必须设置了静态资源根目录
            if (_basedir.empty()) {
                return false;
            }
            // 2. 请求方法,必须是GET / HEAD请求方法
            if (req._method != "GET" && req._method != "HEAD") {
                return false;
            }
            // 3. 请求的资源路径必须是一个合法路径
            if (Util::ValidPath(req._path) == false) {
                return false;
            }
            // 4. 请求的资源必须存在,且是一个普通文件
            //    有一种请求比较特殊 -- 目录:/, /image/, 这种情况给后边默认追加一个 index.html
            // index.html    /image/a.png
            // 不要忘了前缀的相对根目录,也就是将请求路径转换为实际存在的路径  /image/a.png  ->   ./wwwroot/image/a.png
            std::string req_path = _basedir + req._path;//为了避免直接修改请求的资源路径,因此定义一个临时对象
            if (req._path.back() == '/')  {
                req_path += "index.html";
            }
            if (Util::IsRegular(req_path) == false) {
                return false;
            }
            return true;
        }
        //静态资源的请求处理 --- 将静态资源文件的数据读取出来,放到rsp的_body中, 并设置mime
        void FileHandler(const HttpRequest &req, HttpResponse *rsp) {
            std::string req_path = _basedir + req._path;
            if (req._path.back() == '/')  {
                req_path += "index.html";
            }
            bool ret = Util::ReadFile(req_path, &rsp->_body);
            if (ret == false) {
                return;
            }
            std::string mime = Util::ExtMime(req_path);
            rsp->SetHeader("Content-Type", mime);
            return;
        }
        //功能性请求的分类处理
        void Dispatcher(HttpRequest &req, HttpResponse *rsp, Handlers &handlers) {
            //在对应请求方法的路由表中,查找是否含有对应资源请求的处理函数,有则调用,没有则发挥404
            //思想:路由表存储的时键值对 -- 正则表达式 & 处理函数
            //使用正则表达式,对请求的资源路径进行正则匹配,匹配成功就使用对应函数进行处理
            //  /numbers/(\d+)       /numbers/12345
            for (auto &handler : handlers) {
                const std::regex &re = handler.first;
                const Handler &functor = handler.second;
                bool ret = std::regex_match(req._path, req._matches, re);
                if (ret == false) {
                    continue;
                }
                return functor(req, rsp);//传入请求信息,和空的rsp,执行处理函数
            }
            rsp->_statu = 404;
        }
        void Route(HttpRequest &req, HttpResponse *rsp) {
            //1. 对请求进行分辨,是一个静态资源请求,还是一个功能性请求
            //   静态资源请求,则进行静态资源的处理
            //   功能性请求,则需要通过几个请求路由表来确定是否有处理函数
            //   既不是静态资源请求,也没有设置对应的功能性请求处理函数,就返回405
            if (IsFileHandler(req) == true) {
                //是一个静态资源请求, 则进行静态资源请求的处理
                return FileHandler(req, rsp);
            }
            if (req._method == "GET" || req._method == "HEAD") {
                return Dispatcher(req, rsp, _get_route);
            }else if (req._method == "POST") {
                return Dispatcher(req, rsp, _post_route);
            }else if (req._method == "PUT") {
                return Dispatcher(req, rsp, _put_route);
            }else if (req._method == "DELETE") {
                return Dispatcher(req, rsp, _delete_route);
            }
            rsp->_statu = 405;// Method Not Allowed
            return ;
        }
        //设置上下文
        void OnConnected(const PtrConnection &conn) {
            conn->SetContext(HttpContext());
            DBG_LOG("NEW CONNECTION %p", conn.get());
        }
        //缓冲区数据解析+处理
        void OnMessage(const PtrConnection &conn, Buffer *buffer) {
            while(buffer->ReadAbleSize() > 0){
                //1. 获取上下文
                HttpContext *context = conn->GetContext()->get<HttpContext>();
                //2. 通过上下文对缓冲区数据进行解析,得到HttpRequest对象
                //  1. 如果缓冲区的数据解析出错,就直接回复出错响应
                //  2. 如果解析正常,且请求已经获取完毕,才开始去进行处理
                context->RecvHttpRequest(buffer);
                HttpRequest &req = context->Request();
                HttpResponse rsp(context->RespStatu());
                if (context->RespStatu() >= 400) {
                    //进行错误响应,关闭连接
                    ErrorHandler(req, &rsp);//填充一个错误显示页面数据到rsp中
                    WriteReponse(conn, req, rsp);//组织响应发送给客户端
                    context->ReSet();
                    buffer->MoveReadOffset(buffer->ReadAbleSize());//出错了就把缓冲区数据清空
                    conn->Shutdown();//关闭连接
                    return;
                }
                if (context->RecvStatu() != RECV_HTTP_OVER) {
                    //当前请求还没有接收完整,则退出,等新数据到来再重新继续处理
                    return;
                }
                //3. 请求路由 + 业务处理
                Route(req, &rsp);
                //4. 对HttpResponse进行组织发送
                WriteReponse(conn, req, rsp);
                //5. 重置上下文
                context->ReSet();
                //6. 根据长短连接判断是否关闭连接或者继续处理
                if (rsp.Close() == true) conn->Shutdown();//短链接则直接关闭
            }
            return;
        }
    public:
        HttpServer(int port, int timeout = DEFALT_TIMEOUT):_server(port) {
            _server.EnableInactiveRelease(timeout);
            _server.SetConnectedCallback(std::bind(&HttpServer::OnConnected, this, std::placeholders::_1));
            _server.SetMessageCallback(std::bind(&HttpServer::OnMessage, this, std::placeholders::_1, std::placeholders::_2));
        }
        void SetBaseDir(const std::string &path) {
            assert(Util::IsDirectory(path) == true);
            _basedir = path;
        }
        /*设置/添加,请求(请求的正则表达)与处理函数的映射关系*/
        void Get(const std::string &pattern, const Handler &handler) {
            _get_route.push_back(std::make_pair(std::regex(pattern), handler));
        }
        void Post(const std::string &pattern, const Handler &handler) {
            _post_route.push_back(std::make_pair(std::regex(pattern), handler));
        }
        void Put(const std::string &pattern, const Handler &handler) {
            _put_route.push_back(std::make_pair(std::regex(pattern), handler));
        }
        void Delete(const std::string &pattern, const Handler &handler) {
            _delete_route.push_back(std::make_pair(std::regex(pattern), handler));
        }
        void SetThreadCount(int count) {
            _server.SetThreadCount(count);
        }
        void Listen() {
            _server.Start();
        }
};

server.hpp


#ifndef __M_SERVER_H__
#define __M_SERVER_H__
#include <iostream>
#include <vector>
#include <string>
#include <cassert>
#include <cstring>
#include <ctime>
#include <functional>
#include <unordered_map>
#include <thread>
#include <mutex>
#include <condition_variable>
#include <memory>
#include <typeinfo>
#include <fcntl.h>
#include <signal.h>
#include <unistd.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/epoll.h>
#include <sys/eventfd.h>
#include <sys/timerfd.h>

#define INF 0
#define DBG 1
#define ERR 2
#define LOG_LEVEL DBG

#define LOG(level, format, ...) do{\
        if (level < LOG_LEVEL) break;\
        time_t t = time(NULL);\
        struct tm *ltm = localtime(&t);\
        char tmp[32] = {0};\
        strftime(tmp, 31, "%H:%M:%S", ltm);\
        fprintf(stdout, "[%p %s %s:%d] " format "\n", (void*)pthread_self(), tmp, __FILE__, __LINE__, ##__VA_ARGS__);\
    }while(0)

#define INF_LOG(format, ...) LOG(INF, format, ##__VA_ARGS__)
#define DBG_LOG(format, ...) LOG(DBG, format, ##__VA_ARGS__)
#define ERR_LOG(format, ...) LOG(ERR, format, ##__VA_ARGS__)

#define BUFFER_DEFAULT_SIZE 1024
class Buffer {
    private:
        std::vector<char> _buffer; //使用vector进行内存空间管理
        uint64_t _reader_idx; //读偏移
        uint64_t _writer_idx; //写偏移
    public:
        Buffer():_reader_idx(0), _writer_idx(0), _buffer(BUFFER_DEFAULT_SIZE){}
        char *Begin() { return &*_buffer.begin(); }
        //获取当前写入起始地址, _buffer的空间起始地址,加上写偏移量
        char *WritePosition() { return Begin() + _writer_idx; }
        //获取当前读取起始地址
        char *ReadPosition() { return Begin() + _reader_idx; }
        //获取缓冲区末尾空闲空间大小--写偏移之后的空闲空间, 总体空间大小减去写偏移
        uint64_t TailIdleSize() { return _buffer.size() - _writer_idx; }
        //获取缓冲区起始空闲空间大小--读偏移之前的空闲空间
        uint64_t HeadIdleSize() { return _reader_idx; }
        //获取可读数据大小 = 写偏移 - 读偏移
        uint64_t ReadAbleSize() { return _writer_idx - _reader_idx; }
        //将读偏移向后移动
        void MoveReadOffset(uint64_t len) { 
            if (len == 0) return; 
            //向后移动的大小,必须小于可读数据大小
            assert(len <= ReadAbleSize());
            _reader_idx += len;
        }
        //将写偏移向后移动 
        void MoveWriteOffset(uint64_t len) {
            //向后移动的大小,必须小于当前后边的空闲空间大小
            assert(len <= TailIdleSize());
            _writer_idx += len;
        }
        //确保可写空间足够(整体空闲空间够了就移动数据,否则就扩容)
        void EnsureWriteSpace(uint64_t len) {
            //如果末尾空闲空间大小足够,直接返回
            if (TailIdleSize() >= len) { return; }
            //末尾空闲空间不够,则判断加上起始位置的空闲空间大小是否足够, 够了就将数据移动到起始位置
            if (len <= TailIdleSize() + HeadIdleSize()) {
                //将数据移动到起始位置
                uint64_t rsz = ReadAbleSize();//把当前数据大小先保存起来
                std::copy(ReadPosition(), ReadPosition() + rsz, Begin());//把可读数据拷贝到起始位置
                _reader_idx = 0;    //将读偏移归0
                _writer_idx = rsz;  //将写位置置为可读数据大小, 因为当前的可读数据大小就是写偏移量
            }else {
                //总体空间不够,则需要扩容,不移动数据,直接给写偏移之后扩容足够空间即可
                DBG_LOG("RESIZE %ld", _writer_idx + len);
                _buffer.resize(_writer_idx + len);
            }
        } 
        //写入数据
        void Write(const void *data, uint64_t len) {
            //1. 保证有足够空间,2. 拷贝数据进去
            if (len == 0) return;
            EnsureWriteSpace(len);
            const char *d = (const char *)data;
            std::copy(d, d + len, WritePosition());
        }
        void WriteAndPush(const void *data, uint64_t len) {
            Write(data, len);
            MoveWriteOffset(len);
        }
        void WriteString(const std::string &data) {
            return Write(data.c_str(), data.size());
        }
        void WriteStringAndPush(const std::string &data) {
            WriteString(data);
            MoveWriteOffset(data.size());
        }
        void WriteBuffer(Buffer &data) {
            return Write(data.ReadPosition(), data.ReadAbleSize());
        }
        void WriteBufferAndPush(Buffer &data) { 
            WriteBuffer(data);
            MoveWriteOffset(data.ReadAbleSize());
        }
        //读取数据
        void Read(void *buf, uint64_t len) {
            //要求要获取的数据大小必须小于可读数据大小
            assert(len <= ReadAbleSize());
            std::copy(ReadPosition(), ReadPosition() + len, (char*)buf);
        }
        void ReadAndPop(void *buf, uint64_t len) {
            Read(buf, len);
            MoveReadOffset(len);
        }
        std::string ReadAsString(uint64_t len) {
            //要求要获取的数据大小必须小于可读数据大小
            assert(len <= ReadAbleSize());
            std::string str;
            str.resize(len);
            Read(&str[0], len);
            return str;
        }
        std::string ReadAsStringAndPop(uint64_t len) {
            assert(len <= ReadAbleSize());
            std::string str = ReadAsString(len);
            MoveReadOffset(len);
            return str;
        }
        char *FindCRLF() {
            char *res = (char*)memchr(ReadPosition(), '\n', ReadAbleSize());
            return res;
        }
        /*通常获取一行数据,这种情况针对是*/
        std::string GetLine() {
            char *pos = FindCRLF();
            if (pos == NULL) {
                return "";
            }
            // +1是为了把换行字符也取出来。
            return ReadAsString(pos - ReadPosition() + 1);
        }
        std::string GetLineAndPop() {
            std::string str = GetLine();
            MoveReadOffset(str.size());
            return str;
        }
        //清空缓冲区
        void Clear() {
            //只需要将偏移量归0即可
            _reader_idx = 0;
            _writer_idx = 0;
        }
};

#define MAX_LISTEN 1024
class Socket {
    private:
        int _sockfd;
    public:
        Socket():_sockfd(-1) {}
        Socket(int fd): _sockfd(fd) {}
        ~Socket() { Close(); }
        int Fd() { return _sockfd; }
        //创建套接字
        bool Create() {
            // int socket(int domain, int type, int protocol)
            _sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
            if (_sockfd < 0) {
                ERR_LOG("CREATE SOCKET FAILED!!");
                return false;
            }
            return true;
        }
        //绑定地址信息
        bool Bind(const std::string &ip, uint16_t port) {
            struct sockaddr_in addr;
            addr.sin_family = AF_INET;
            addr.sin_port = htons(port);
            addr.sin_addr.s_addr = inet_addr(ip.c_str());
            socklen_t len = sizeof(struct sockaddr_in);
            // int bind(int sockfd, struct sockaddr*addr, socklen_t len);
            int ret = bind(_sockfd, (struct sockaddr*)&addr, len);
            if (ret < 0) {
                ERR_LOG("BIND ADDRESS FAILED!");
                return false;
            }
            return true;
        }
        //开始监听
        bool Listen(int backlog = MAX_LISTEN) {
            // int listen(int backlog)
            int ret = listen(_sockfd, backlog);
            if (ret < 0) {
                ERR_LOG("SOCKET LISTEN FAILED!");
                return false;
            }
            return true;
        }
        //向服务器发起连接
        bool Connect(const std::string &ip, uint16_t port) {
            struct sockaddr_in addr;
            addr.sin_family = AF_INET;
            addr.sin_port = htons(port);
            addr.sin_addr.s_addr = inet_addr(ip.c_str());
            socklen_t len = sizeof(struct sockaddr_in);
            // int connect(int sockfd, struct sockaddr*addr, socklen_t len);
            int ret = connect(_sockfd, (struct sockaddr*)&addr, len);
            if (ret < 0) {
                ERR_LOG("CONNECT SERVER FAILED!");
                return false;
            }
            return true;
        }
        //获取新连接
        int Accept() {
            // int accept(int sockfd, struct sockaddr *addr, socklen_t *len);
            int newfd = accept(_sockfd, NULL, NULL);
            if (newfd < 0) {
                ERR_LOG("SOCKET ACCEPT FAILED!");
                return -1;
            }
            return newfd;
        }
        //接收数据
        ssize_t Recv(void *buf, size_t len, int flag = 0) {
            // ssize_t recv(int sockfd, void *buf, size_t len, int flag);
            ssize_t ret = recv(_sockfd, buf, len, flag);
            if (ret <= 0) {
                //EAGAIN 当前socket的接收缓冲区中没有数据了,在非阻塞的情况下才会有这个错误
                //EINTR  表示当前socket的阻塞等待,被信号打断了,
                if (errno == EAGAIN || errno == EINTR) {
                    return 0;//表示这次接收没有接收到数据
                }
                ERR_LOG("SOCKET RECV FAILED!!");
                return -1;
            }
            return ret; //实际接收的数据长度
        }
        ssize_t NonBlockRecv(void *buf, size_t len) {
            return Recv(buf, len, MSG_DONTWAIT); // MSG_DONTWAIT 表示当前接收为非阻塞。
        }
        //发送数据
        ssize_t Send(const void *buf, size_t len, int flag = 0) {
            // ssize_t send(int sockfd, void *data, size_t len, int flag);
            ssize_t ret = send(_sockfd, buf, len, flag);
            if (ret < 0) {
                if (errno == EAGAIN || errno == EINTR) {
                    return 0;
                }
                ERR_LOG("SOCKET SEND FAILED!!");
                return -1;
            }
            return ret;//实际发送的数据长度
        }
        ssize_t NonBlockSend(void *buf, size_t len) {
            if (len == 0) return 0;
            return Send(buf, len, MSG_DONTWAIT); // MSG_DONTWAIT 表示当前发送为非阻塞。
        }
        //关闭套接字
        void Close() {
            if (_sockfd != -1) {
                close(_sockfd);
                _sockfd = -1;
            }
        }
        //创建一个服务端连接
        bool CreateServer(uint16_t port, const std::string &ip = "0.0.0.0", bool block_flag = false) {
            //1. 创建套接字,2. 绑定地址,3. 开始监听,4. 设置非阻塞, 5. 启动地址重用
            if (Create() == false) return false;
            if (block_flag) NonBlock();
            if (Bind(ip, port) == false) return false;
            if (Listen() == false) return false;
            ReuseAddress();
            return true;
        }
        //创建一个客户端连接
        bool CreateClient(uint16_t port, const std::string &ip) {
            //1. 创建套接字,2.指向连接服务器
            if (Create() == false) return false;
            if (Connect(ip, port) == false) return false;
            return true;
        }
        //设置套接字选项---开启地址端口重用
        void ReuseAddress() {
            // int setsockopt(int fd, int leve, int optname, void *val, int vallen)
            int val = 1;
            setsockopt(_sockfd, SOL_SOCKET, SO_REUSEADDR, (void*)&val, sizeof(int));
            val = 1;
            setsockopt(_sockfd, SOL_SOCKET, SO_REUSEPORT, (void*)&val, sizeof(int));
        }
        //设置套接字阻塞属性-- 设置为非阻塞
        void NonBlock() {
            //int fcntl(int fd, int cmd, ... /* arg */ );
            int flag = fcntl(_sockfd, F_GETFL, 0);
            fcntl(_sockfd, F_SETFL, flag | O_NONBLOCK);
        }
};

class Poller;
class EventLoop;
class Channel {
    private:
        int _fd;
        EventLoop *_loop;
        uint32_t _events;  // 当前需要监控的事件
        uint32_t _revents; // 当前连接触发的事件
        using EventCallback = std::function<void()>;
        EventCallback _read_callback;   //可读事件被触发的回调函数
        EventCallback _write_callback;  //可写事件被触发的回调函数
        EventCallback _error_callback;  //错误事件被触发的回调函数
        EventCallback _close_callback;  //连接断开事件被触发的回调函数
        EventCallback _event_callback;  //任意事件被触发的回调函数
    public:
        Channel(EventLoop *loop, int fd):_fd(fd), _events(0), _revents(0), _loop(loop) {}
        int Fd() { return _fd; }
        uint32_t Events() { return _events; }//获取想要监控的事件
        void SetREvents(uint32_t events) { _revents = events; }//设置实际就绪的事件
        void SetReadCallback(const EventCallback &cb) { _read_callback = cb; }
        void SetWriteCallback(const EventCallback &cb) { _write_callback = cb; }
        void SetErrorCallback(const EventCallback &cb) { _error_callback = cb; }
        void SetCloseCallback(const EventCallback &cb) { _close_callback = cb; }
        void SetEventCallback(const EventCallback &cb) { _event_callback = cb; }
        //当前是否监控了可读
        bool ReadAble() { return (_events & EPOLLIN); } 
        //当前是否监控了可写
        bool WriteAble() { return (_events & EPOLLOUT); }
        //启动读事件监控
        void EnableRead() { _events |= EPOLLIN; Update(); }
        //启动写事件监控
        void EnableWrite() { _events |= EPOLLOUT; Update(); }
        //关闭读事件监控
        void DisableRead() { _events &= ~EPOLLIN; Update(); }
        //关闭写事件监控
        void DisableWrite() { _events &= ~EPOLLOUT; Update(); }
        //关闭所有事件监控
        void DisableAll() { _events = 0; Update(); }
        //移除监控
        void Remove();
        void Update();
        //事件处理,一旦连接触发了事件,就调用这个函数,自己触发了什么事件如何处理自己决定
        void HandleEvent() {
            if ((_revents & EPOLLIN) || (_revents & EPOLLRDHUP) || (_revents & EPOLLPRI)) {
                /*不管任何事件,都调用的回调函数*/
                if (_read_callback) _read_callback();
            }
            /*有可能会释放连接的操作事件,一次只处理一个*/
            if (_revents & EPOLLOUT) {
                if (_write_callback) _write_callback();
            }else if (_revents & EPOLLERR) {
                if (_error_callback) _error_callback();//一旦出错,就会释放连接,因此要放到前边调用任意回调
            }else if (_revents & EPOLLHUP) {
                if (_close_callback) _close_callback();
            }
            if (_event_callback) _event_callback();
        }
};
#define MAX_EPOLLEVENTS 1024
class Poller {
    private:
        int _epfd;
        struct epoll_event _evs[MAX_EPOLLEVENTS];
        std::unordered_map<int, Channel *> _channels;
    private:
        //对epoll的直接操作
        void Update(Channel *channel, int op) {
            // int epoll_ctl(int epfd, int op,  int fd,  struct epoll_event *ev);
            int fd = channel->Fd();
            struct epoll_event ev;
            ev.data.fd = fd;
            ev.events = channel->Events();
            int ret = epoll_ctl(_epfd, op, fd, &ev);
            if (ret < 0) {
                ERR_LOG("EPOLLCTL FAILED!");
            }
            return;
        }
        //判断一个Channel是否已经添加了事件监控
        bool HasChannel(Channel *channel) {
            auto it = _channels.find(channel->Fd());
            if (it == _channels.end()) {
                return false;
            }
            return true;
        }
    public:
        Poller() {
            _epfd = epoll_create(MAX_EPOLLEVENTS);
            if (_epfd < 0) {
                ERR_LOG("EPOLL CREATE FAILED!!");
                abort();//退出程序
            }
        }
        //添加或修改监控事件
        void UpdateEvent(Channel *channel) {
            bool ret = HasChannel(channel);
            if (ret == false) {
                //不存在则添加
                _channels.insert(std::make_pair(channel->Fd(), channel));
                return Update(channel, EPOLL_CTL_ADD);
            }
            return Update(channel, EPOLL_CTL_MOD);
        }
        //移除监控
        void RemoveEvent(Channel *channel) {
            auto it = _channels.find(channel->Fd());
            if (it != _channels.end()) {
                _channels.erase(it);
            }
            Update(channel, EPOLL_CTL_DEL);
        }
        //开始监控,返回活跃连接
        void Poll(std::vector<Channel*> *active) {
            // int epoll_wait(int epfd, struct epoll_event *evs, int maxevents, int timeout)
            int nfds = epoll_wait(_epfd, _evs, MAX_EPOLLEVENTS, -1);
            if (nfds < 0) {
                if (errno == EINTR) {
                    return ;
                }
                ERR_LOG("EPOLL WAIT ERROR:%s\n", strerror(errno));
                abort();//退出程序
            }
            for (int i = 0; i < nfds; i++) {
                auto it = _channels.find(_evs[i].data.fd);
                assert(it != _channels.end());
                it->second->SetREvents(_evs[i].events);//设置实际就绪的事件
                active->push_back(it->second);
            }
            return;
        }
};


using TaskFunc = std::function<void()>;
using ReleaseFunc = std::function<void()>;
class TimerTask{
    private:
        uint64_t _id;       // 定时器任务对象ID
        uint32_t _timeout;  //定时任务的超时时间
        bool _canceled;     // false-表示没有被取消, true-表示被取消
        TaskFunc _task_cb;  //定时器对象要执行的定时任务
        ReleaseFunc _release; //用于删除TimerWheel中保存的定时器对象信息
    public:
        TimerTask(uint64_t id, uint32_t delay, const TaskFunc &cb): 
            _id(id), _timeout(delay), _task_cb(cb), _canceled(false) {}
        ~TimerTask() { 
            if (_canceled == false) _task_cb(); 
            _release(); 
        }
        void Cancel() { _canceled = true; }
        void SetRelease(const ReleaseFunc &cb) { _release = cb; }
        uint32_t DelayTime() { return _timeout; }
};

class TimerWheel {
    private:
        using WeakTask = std::weak_ptr<TimerTask>;
        using PtrTask = std::shared_ptr<TimerTask>;
        int _tick;      //当前的秒针,走到哪里释放哪里,释放哪里,就相当于执行哪里的任务
        int _capacity;  //表盘最大数量---其实就是最大延迟时间
        std::vector<std::vector<PtrTask>> _wheel;
        std::unordered_map<uint64_t, WeakTask> _timers;

        EventLoop *_loop;
        int _timerfd;//定时器描述符--可读事件回调就是读取计数器,执行定时任务
        std::unique_ptr<Channel> _timer_channel;
    private:
        void RemoveTimer(uint64_t id) {
            auto it = _timers.find(id);
            if (it != _timers.end()) {
                _timers.erase(it);
            }
        }
        static int CreateTimerfd() {
            int timerfd = timerfd_create(CLOCK_MONOTONIC, 0);
            if (timerfd < 0) {
                ERR_LOG("TIMERFD CREATE FAILED!");
                abort();
            }
            //int timerfd_settime(int fd, int flags, struct itimerspec *new, struct itimerspec *old);
            struct itimerspec itime;
            itime.it_value.tv_sec = 1;
            itime.it_value.tv_nsec = 0;//第一次超时时间为1s后
            itime.it_interval.tv_sec = 1; 
            itime.it_interval.tv_nsec = 0; //第一次超时后,每次超时的间隔时
            timerfd_settime(timerfd, 0, &itime, NULL);
            return timerfd;
        }
        int ReadTimefd() {
            uint64_t times;
            //有可能因为其他描述符的事件处理花费事件比较长,然后在处理定时器描述符事件的时候,有可能就已经超时了很多次
            //read读取到的数据times就是从上一次read之后超时的次数
            int ret = read(_timerfd, &times, 8);
            if (ret < 0) {
                ERR_LOG("READ TIMEFD FAILED!");
                abort();
            }
            return times;
        }
        //这个函数应该每秒钟被执行一次,相当于秒针向后走了一步
        void RunTimerTask() {
            _tick = (_tick + 1) % _capacity;
            _wheel[_tick].clear();//清空指定位置的数组,就会把数组中保存的所有管理定时器对象的shared_ptr释放掉
        }
        void OnTime() {
            //根据实际超时的次数,执行对应的超时任务
            int times = ReadTimefd();
            for (int i = 0; i < times; i++) {
                RunTimerTask();
            }
        }
        void TimerAddInLoop(uint64_t id, uint32_t delay, const TaskFunc &cb) {
            PtrTask pt(new TimerTask(id, delay, cb));
            pt->SetRelease(std::bind(&TimerWheel::RemoveTimer, this, id));
            int pos = (_tick + delay) % _capacity;
            _wheel[pos].push_back(pt);
            _timers[id] = WeakTask(pt);
        }
        void TimerRefreshInLoop(uint64_t id) {
            //通过保存的定时器对象的weak_ptr构造一个shared_ptr出来,添加到轮子中
            auto it = _timers.find(id);
            if (it == _timers.end()) {
                return;//没找着定时任务,没法刷新,没法延迟
            }
            PtrTask pt = it->second.lock();//lock获取weak_ptr管理的对象对应的shared_ptr
            int delay = pt->DelayTime();
            int pos = (_tick + delay) % _capacity;
            _wheel[pos].push_back(pt);
        }
        void TimerCancelInLoop(uint64_t id) {
            auto it = _timers.find(id);
            if (it == _timers.end()) {
                return;//没找着定时任务,没法刷新,没法延迟
            }
            PtrTask pt = it->second.lock();
            if (pt) pt->Cancel();
        }
    public:
        TimerWheel(EventLoop *loop):_capacity(60), _tick(0), _wheel(_capacity), _loop(loop), 
            _timerfd(CreateTimerfd()), _timer_channel(new Channel(_loop, _timerfd)) {
            _timer_channel->SetReadCallback(std::bind(&TimerWheel::OnTime, this));
            _timer_channel->EnableRead();//启动读事件监控
        }
        /*定时器中有个_timers成员,定时器信息的操作有可能在多线程中进行,因此需要考虑线程安全问题*/
        /*如果不想加锁,那就把对定期的所有操作,都放到一个线程中进行*/
        void TimerAdd(uint64_t id, uint32_t delay, const TaskFunc &cb);
        //刷新/延迟定时任务
        void TimerRefresh(uint64_t id);
        void TimerCancel(uint64_t id);
        /*这个接口存在线程安全问题--这个接口实际上不能被外界使用者调用,只能在模块内,在对应的EventLoop线程内执行*/
        bool HasTimer(uint64_t id) {
            auto it = _timers.find(id);
            if (it == _timers.end()) {
                return false;
            }
            return true;
        }
};

class EventLoop {
    private:
        using Functor = std::function<void()>;
        std::thread::id _thread_id;//线程ID
        int _event_fd;//eventfd唤醒IO事件监控有可能导致的阻塞
        std::unique_ptr<Channel> _event_channel;
        Poller _poller;//进行所有描述符的事件监控
        std::vector<Functor> _tasks;//任务池
        std::mutex _mutex;//实现任务池操作的线程安全
        TimerWheel _timer_wheel;//定时器模块
    public:
        //执行任务池中的所有任务
        void RunAllTask() {
            std::vector<Functor> functor;
            {
                std::unique_lock<std::mutex> _lock(_mutex);
                _tasks.swap(functor);
            }
            for (auto &f : functor) {
                f();
            }
            return ;
        }
        static int CreateEventFd() {
            int efd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
            if (efd < 0) {
                ERR_LOG("CREATE EVENTFD FAILED!!");
                abort();//让程序异常退出
            }
            return efd;
        }
        void ReadEventfd() {
            uint64_t res = 0;
            int ret = read(_event_fd, &res, sizeof(res));
            if (ret < 0) {
                //EINTR -- 被信号打断;   EAGAIN -- 表示无数据可读
                if (errno == EINTR || errno == EAGAIN) {
                    return;
                }
                ERR_LOG("READ EVENTFD FAILED!");
                abort();
            }
            return ;
        }
        void WeakUpEventFd() {
            uint64_t val = 1;
            int ret = write(_event_fd, &val, sizeof(val));
            if (ret < 0) {
                if (errno == EINTR) {
                    return;
                }
                ERR_LOG("READ EVENTFD FAILED!");
                abort();
            }
            return ;
        }
    public:
        EventLoop():_thread_id(std::this_thread::get_id()), 
                    _event_fd(CreateEventFd()), 
                    _event_channel(new Channel(this, _event_fd)),
                    _timer_wheel(this) {
            //给eventfd添加可读事件回调函数,读取eventfd事件通知次数
            _event_channel->SetReadCallback(std::bind(&EventLoop::ReadEventfd, this));
            //启动eventfd的读事件监控
            _event_channel->EnableRead();
        }
        //三步走--事件监控-》就绪事件处理-》执行任务
        void Start() {
            while(1) {
                //1. 事件监控, 
                std::vector<Channel *> actives;
                _poller.Poll(&actives);
                //2. 事件处理。 
                for (auto &channel : actives) {
                    channel->HandleEvent();
                }
                //3. 执行任务
                RunAllTask();
            }
        }
        //用于判断当前线程是否是EventLoop对应的线程;
        bool IsInLoop() {
            return (_thread_id == std::this_thread::get_id());
        }
        void AssertInLoop() {
            assert(_thread_id == std::this_thread::get_id());
        }
        //判断将要执行的任务是否处于当前线程中,如果是则执行,不是则压入队列。
        void RunInLoop(const Functor &cb) {
            if (IsInLoop()) {
                return cb();
            }
            return QueueInLoop(cb);
        }
        //将操作压入任务池
        void QueueInLoop(const Functor &cb) {
            {
                std::unique_lock<std::mutex> _lock(_mutex);
                _tasks.push_back(cb);
            }
            //唤醒有可能因为没有事件就绪,而导致的epoll阻塞;
            //其实就是给eventfd写入一个数据,eventfd就会触发可读事件
            WeakUpEventFd();
        }
        //添加/修改描述符的事件监控
        void UpdateEvent(Channel *channel) { return _poller.UpdateEvent(channel); }
        //移除描述符的监控
        void RemoveEvent(Channel *channel) { return _poller.RemoveEvent(channel); }
        void TimerAdd(uint64_t id, uint32_t delay, const TaskFunc &cb) { return _timer_wheel.TimerAdd(id, delay, cb); }
        void TimerRefresh(uint64_t id) { return _timer_wheel.TimerRefresh(id); }
        void TimerCancel(uint64_t id) { return _timer_wheel.TimerCancel(id); }
        bool HasTimer(uint64_t id) { return _timer_wheel.HasTimer(id); }
};
class LoopThread {
    private:
        /*用于实现_loop获取的同步关系,避免线程创建了,但是_loop还没有实例化之前去获取_loop*/
        std::mutex _mutex;          // 互斥锁
        std::condition_variable _cond;   // 条件变量
        EventLoop *_loop;       // EventLoop指针变量,这个对象需要在线程内实例化
        std::thread _thread;    // EventLoop对应的线程
    private:
        /*实例化 EventLoop 对象,唤醒_cond上有可能阻塞的线程,并且开始运行EventLoop模块的功能*/
        void ThreadEntry() {
            EventLoop loop;
            {
                std::unique_lock<std::mutex> lock(_mutex);//加锁
                _loop = &loop;
                _cond.notify_all();
            }
            loop.Start();
        }
    public:
        /*创建线程,设定线程入口函数*/
        LoopThread():_loop(NULL), _thread(std::thread(&LoopThread::ThreadEntry, this)) {}
        /*返回当前线程关联的EventLoop对象指针*/
        EventLoop *GetLoop() {
            EventLoop *loop = NULL;
            {
                std::unique_lock<std::mutex> lock(_mutex);//加锁
                _cond.wait(lock, [&](){ return _loop != NULL; });//loop为NULL就一直阻塞
                loop = _loop;
            }
            return loop;
        }
};

class LoopThreadPool {
    private:
        int _thread_count;
        int _next_idx;
        EventLoop *_baseloop;
        std::vector<LoopThread*> _threads;
        std::vector<EventLoop *> _loops;
    public:
        LoopThreadPool(EventLoop *baseloop):_thread_count(0), _next_idx(0), _baseloop(baseloop) {}
        void SetThreadCount(int count) { _thread_count = count; }
        void Create() {
            if (_thread_count > 0) {
                _threads.resize(_thread_count);
                _loops.resize(_thread_count);
                for (int i = 0; i < _thread_count; i++) {
                    _threads[i] = new LoopThread();
                    _loops[i] = _threads[i]->GetLoop();
                }
            }
            return ;
        }
        EventLoop *NextLoop() {
            if (_thread_count == 0) {
                return _baseloop;
            }
            _next_idx = (_next_idx + 1) % _thread_count;
            return _loops[_next_idx];
        }
};


class Any{
    private:
        class holder {
            public:
                virtual ~holder() {}
                virtual const std::type_info& type() = 0;
                virtual holder *clone() = 0;
        };
        template<class T>
        class placeholder: public holder {
            public:
                placeholder(const T &val): _val(val) {}
                // 获取子类对象保存的数据类型
                virtual const std::type_info& type() { return typeid(T); }
                // 针对当前的对象自身,克隆出一个新的子类对象
                virtual holder *clone() { return new placeholder(_val); }
            public:
                T _val;
        };
        holder *_content;
    public:
        Any():_content(NULL) {}
        template<class T>
        Any(const T &val):_content(new placeholder<T>(val)) {}
        Any(const Any &other):_content(other._content ? other._content->clone() : NULL) {}
        ~Any() { delete _content; }

        Any &swap(Any &other) {
            std::swap(_content, other._content);
            return *this;
        }

        // 返回子类对象保存的数据的指针
        template<class T>
        T *get() {
            //想要获取的数据类型,必须和保存的数据类型一致
            assert(typeid(T) == _content->type());
            return &((placeholder<T>*)_content)->_val;
        }
        //赋值运算符的重载函数
        template<class T>
        Any& operator=(const T &val) {
            //为val构造一个临时的通用容器,然后与当前容器自身进行指针交换,临时对象释放的时候,原先保存的数据也就被释放
            Any(val).swap(*this);
            return *this;
        }
        Any& operator=(const Any &other) {
            Any(other).swap(*this);
            return *this;
        }
};

class Connection;
//DISCONECTED -- 连接关闭状态;   CONNECTING -- 连接建立成功-待处理状态
//CONNECTED -- 连接建立完成,各种设置已完成,可以通信的状态;  DISCONNECTING -- 待关闭状态
typedef enum { DISCONNECTED, CONNECTING, CONNECTED, DISCONNECTING}ConnStatu;
using PtrConnection = std::shared_ptr<Connection>;
class Connection : public std::enable_shared_from_this<Connection> {
    private:
        uint64_t _conn_id;  // 连接的唯一ID,便于连接的管理和查找
        //uint64_t _timer_id;   //定时器ID,必须是唯一的,这块为了简化操作使用conn_id作为定时器ID
        int _sockfd;        // 连接关联的文件描述符
        bool _enable_inactive_release;  // 连接是否启动非活跃销毁的判断标志,默认为false
        EventLoop *_loop;   // 连接所关联的一个EventLoop
        ConnStatu _statu;   // 连接状态
        Socket _socket;     // 套接字操作管理
        Channel _channel;   // 连接的事件管理
        Buffer _in_buffer;  // 输入缓冲区---存放从socket中读取到的数据
        Buffer _out_buffer; // 输出缓冲区---存放要发送给对端的数据
        Any _context;       // 请求的接收处理上下文

        /*这四个回调函数,是让服务器模块来设置的(其实服务器模块的处理回调也是组件使用者设置的)*/
        /*换句话说,这几个回调都是组件使用者使用的*/
        using ConnectedCallback = std::function<void(const PtrConnection&)>;
        using MessageCallback = std::function<void(const PtrConnection&, Buffer *)>;
        using ClosedCallback = std::function<void(const PtrConnection&)>;
        using AnyEventCallback = std::function<void(const PtrConnection&)>;
        ConnectedCallback _connected_callback;
        MessageCallback _message_callback;
        ClosedCallback _closed_callback;
        AnyEventCallback _event_callback;
        /*组件内的连接关闭回调--组件内设置的,因为服务器组件内会把所有的连接管理起来,一旦某个连接要关闭*/
        /*就应该从管理的地方移除掉自己的信息*/
        ClosedCallback _server_closed_callback;
    private:
        /*五个channel的事件回调函数*/
        //描述符可读事件触发后调用的函数,接收socket数据放到接收缓冲区中,然后调用_message_callback
        void HandleRead() {
            //1. 接收socket的数据,放到缓冲区
            char buf[65536];
            ssize_t ret = _socket.NonBlockRecv(buf, 65535);
            if (ret < 0) {
                //出错了,不能直接关闭连接
                return ShutdownInLoop();
            }
            //这里的等于0表示的是没有读取到数据,而并不是连接断开了,连接断开返回的是-1
            //将数据放入输入缓冲区,写入之后顺便将写偏移向后移动
            _in_buffer.WriteAndPush(buf, ret);
            //2. 调用message_callback进行业务处理
            if (_in_buffer.ReadAbleSize() > 0) {
                //shared_from_this--从当前对象自身获取自身的shared_ptr管理对象
                return _message_callback(shared_from_this(), &_in_buffer);
            }
        }
        //描述符可写事件触发后调用的函数,将发送缓冲区中的数据进行发送
        void HandleWrite() {
            //_out_buffer中保存的数据就是要发送的数据
            ssize_t ret = _socket.NonBlockSend(_out_buffer.ReadPosition(), _out_buffer.ReadAbleSize());
            if (ret < 0) {
                //发送错误就该关闭连接了,
                if (_in_buffer.ReadAbleSize() > 0) {
                    _message_callback(shared_from_this(), &_in_buffer);
                }
                return Release();//这时候就是实际的关闭释放操作了。
            }
            _out_buffer.MoveReadOffset(ret);//千万不要忘了,将读偏移向后移动
            if (_out_buffer.ReadAbleSize() == 0) {
                _channel.DisableWrite();// 没有数据待发送了,关闭写事件监控
                //如果当前是连接待关闭状态,则有数据,发送完数据释放连接,没有数据则直接释放
                if (_statu == DISCONNECTING) {
                    return Release();
                }
            }
            return;
        }
        //描述符触发挂断事件
        void HandleClose() {
            /*一旦连接挂断了,套接字就什么都干不了了,因此有数据待处理就处理一下,完毕关闭连接*/
            if (_in_buffer.ReadAbleSize() > 0) {
                _message_callback(shared_from_this(), &_in_buffer);
            }
            return Release();
        }
        //描述符触发出错事件
        void HandleError() {
            return HandleClose();
        }
        //描述符触发任意事件: 1. 刷新连接的活跃度--延迟定时销毁任务;  2. 调用组件使用者的任意事件回调
        void HandleEvent() {
            if (_enable_inactive_release == true)  {  _loop->TimerRefresh(_conn_id); }
            if (_event_callback)  {  _event_callback(shared_from_this()); }
        }
        //连接获取之后,所处的状态下要进行各种设置(启动读监控,调用回调函数)
        void EstablishedInLoop() {
            // 1. 修改连接状态;  2. 启动读事件监控;  3. 调用回调函数
            assert(_statu == CONNECTING);//当前的状态必须一定是上层的半连接状态
            _statu = CONNECTED;//当前函数执行完毕,则连接进入已完成连接状态
            // 一旦启动读事件监控就有可能会立即触发读事件,如果这时候启动了非活跃连接销毁
            _channel.EnableRead();
            if (_connected_callback) _connected_callback(shared_from_this());
        }
        //这个接口才是实际的释放接口
        void ReleaseInLoop() {
            //1. 修改连接状态,将其置为DISCONNECTED
            _statu = DISCONNECTED;
            //2. 移除连接的事件监控
            _channel.Remove();
            //3. 关闭描述符
            _socket.Close();
            //4. 如果当前定时器队列中还有定时销毁任务,则取消任务
            if (_loop->HasTimer(_conn_id)) CancelInactiveReleaseInLoop();
            //5. 调用关闭回调函数,避免先移除服务器管理的连接信息导致Connection被释放,再去处理会出错,因此先调用用户的回调函数
            if (_closed_callback) _closed_callback(shared_from_this());
            //移除服务器内部管理的连接信息
            if (_server_closed_callback) _server_closed_callback(shared_from_this());
        }
        //这个接口并不是实际的发送接口,而只是把数据放到了发送缓冲区,启动了可写事件监控
        void SendInLoop(Buffer &buf) {
            if (_statu == DISCONNECTED) return ;
            _out_buffer.WriteBufferAndPush(buf);
            if (_channel.WriteAble() == false) {
                _channel.EnableWrite();
            }
        }
        //这个关闭操作并非实际的连接释放操作,需要判断还有没有数据待处理,待发送
        void ShutdownInLoop() {
            _statu = DISCONNECTING;// 设置连接为半关闭状态
            if (_in_buffer.ReadAbleSize() > 0) {
                if (_message_callback) _message_callback(shared_from_this(), &_in_buffer);
            }
            //要么就是写入数据的时候出错关闭,要么就是没有待发送数据,直接关闭
            if (_out_buffer.ReadAbleSize() > 0) {
                if (_channel.WriteAble() == false) {
                    _channel.EnableWrite();
                }
            }
            if (_out_buffer.ReadAbleSize() == 0) {
                Release();
            }
        }
        //启动非活跃连接超时释放规则
        void EnableInactiveReleaseInLoop(int sec) {
            //1. 将判断标志 _enable_inactive_release 置为true
            _enable_inactive_release = true;
            //2. 如果当前定时销毁任务已经存在,那就刷新延迟一下即可
            if (_loop->HasTimer(_conn_id)) {
                return _loop->TimerRefresh(_conn_id);
            }
            //3. 如果不存在定时销毁任务,则新增
            _loop->TimerAdd(_conn_id, sec, std::bind(&Connection::Release, this));
        }
        void CancelInactiveReleaseInLoop() {
            _enable_inactive_release = false;
            if (_loop->HasTimer(_conn_id)) { 
                _loop->TimerCancel(_conn_id); 
            }
        }
        void UpgradeInLoop(const Any &context, 
                    const ConnectedCallback &conn, 
                    const MessageCallback &msg, 
                    const ClosedCallback &closed, 
                    const AnyEventCallback &event) {
            _context = context;
            _connected_callback = conn;
            _message_callback = msg;
            _closed_callback = closed;
            _event_callback = event;
        }
    public:
        Connection(EventLoop *loop, uint64_t conn_id, int sockfd):_conn_id(conn_id), _sockfd(sockfd),
            _enable_inactive_release(false), _loop(loop), _statu(CONNECTING), _socket(_sockfd),
            _channel(loop, _sockfd) {
            _channel.SetCloseCallback(std::bind(&Connection::HandleClose, this));
            _channel.SetEventCallback(std::bind(&Connection::HandleEvent, this));
            _channel.SetReadCallback(std::bind(&Connection::HandleRead, this));
            _channel.SetWriteCallback(std::bind(&Connection::HandleWrite, this));
            _channel.SetErrorCallback(std::bind(&Connection::HandleError, this));
        }
        ~Connection() { DBG_LOG("RELEASE CONNECTION:%p", this); }
        //获取管理的文件描述符
        int Fd() { return _sockfd; }
        //获取连接ID
        int Id() { return _conn_id; }
        //是否处于CONNECTED状态
        bool Connected() { return (_statu == CONNECTED); }
        //设置上下文--连接建立完成时进行调用
        void SetContext(const Any &context) { _context = context; }
        //获取上下文,返回的是指针
        Any *GetContext() { return &_context; }
        void SetConnectedCallback(const ConnectedCallback&cb) { _connected_callback = cb; }
        void SetMessageCallback(const MessageCallback&cb) { _message_callback = cb; }
        void SetClosedCallback(const ClosedCallback&cb) { _closed_callback = cb; }
        void SetAnyEventCallback(const AnyEventCallback&cb) { _event_callback = cb; }
        void SetSrvClosedCallback(const ClosedCallback&cb) { _server_closed_callback = cb; }
        //连接建立就绪后,进行channel回调设置,启动读监控,调用_connected_callback
        void Established() {
            _loop->RunInLoop(std::bind(&Connection::EstablishedInLoop, this));
        }
        //发送数据,将数据放到发送缓冲区,启动写事件监控
        void Send(const char *data, size_t len) {
            //外界传入的data,可能是个临时的空间,我们现在只是把发送操作压入了任务池,有可能并没有被立即执行
            //因此有可能执行的时候,data指向的空间有可能已经被释放了。
            Buffer buf;
            buf.WriteAndPush(data, len);
            _loop->RunInLoop(std::bind(&Connection::SendInLoop, this, std::move(buf)));
        }
        //提供给组件使用者的关闭接口--并不实际关闭,需要判断有没有数据待处理
        void Shutdown() {
            _loop->RunInLoop(std::bind(&Connection::ShutdownInLoop, this));
        }
        void Release() {
            _loop->QueueInLoop(std::bind(&Connection::ReleaseInLoop, this));
        }
        //启动非活跃销毁,并定义多长时间无通信就是非活跃,添加定时任务
        void EnableInactiveRelease(int sec) {
            _loop->RunInLoop(std::bind(&Connection::EnableInactiveReleaseInLoop, this, sec));
        }
        //取消非活跃销毁
        void CancelInactiveRelease() {
            _loop->RunInLoop(std::bind(&Connection::CancelInactiveReleaseInLoop, this));
        }
        //切换协议---重置上下文以及阶段性回调处理函数 -- 而是这个接口必须在EventLoop线程中立即执行
        //防备新的事件触发后,处理的时候,切换任务还没有被执行--会导致数据使用原协议处理了。
        void Upgrade(const Any &context, const ConnectedCallback &conn, const MessageCallback &msg, 
                     const ClosedCallback &closed, const AnyEventCallback &event) {
            _loop->AssertInLoop();
            _loop->RunInLoop(std::bind(&Connection::UpgradeInLoop, this, context, conn, msg, closed, event));
        }
};

class Acceptor {
    private:
        Socket _socket;//用于创建监听套接字
        EventLoop *_loop; //用于对监听套接字进行事件监控
        Channel _channel; //用于对监听套接字进行事件管理

        using AcceptCallback = std::function<void(int)>;
        AcceptCallback _accept_callback;
    private:
        /*监听套接字的读事件回调处理函数---获取新连接,调用_accept_callback函数进行新连接处理*/
        void HandleRead() {
            int newfd = _socket.Accept();
            if (newfd < 0) {
                return ;
            }
            if (_accept_callback) _accept_callback(newfd);
        }
        int CreateServer(int port) {
            bool ret = _socket.CreateServer(port);
            assert(ret == true);
            return _socket.Fd();
        }
    public:
        /*不能将启动读事件监控,放到构造函数中,必须在设置回调函数后,再去启动*/
        /*否则有可能造成启动监控后,立即有事件,处理的时候,回调函数还没设置:新连接得不到处理,且资源泄漏*/
        Acceptor(EventLoop *loop, int port): _socket(CreateServer(port)), _loop(loop), 
            _channel(loop, _socket.Fd()) {
            _channel.SetReadCallback(std::bind(&Acceptor::HandleRead, this));
        }
        void SetAcceptCallback(const AcceptCallback &cb) { _accept_callback = cb; }
        void Listen() { _channel.EnableRead(); }
};

class TcpServer {
    private:
        uint64_t _next_id;      //这是一个自动增长的连接ID,
        int _port;
        int _timeout;           //这是非活跃连接的统计时间---多长时间无通信就是非活跃连接
        bool _enable_inactive_release;//是否启动了非活跃连接超时销毁的判断标志
        EventLoop _baseloop;    //这是主线程的EventLoop对象,负责监听事件的处理
        Acceptor _acceptor;    //这是监听套接字的管理对象
        LoopThreadPool _pool;   //这是从属EventLoop线程池
        std::unordered_map<uint64_t, PtrConnection> _conns;//保存管理所有连接对应的shared_ptr对象

        using ConnectedCallback = std::function<void(const PtrConnection&)>;
        using MessageCallback = std::function<void(const PtrConnection&, Buffer *)>;
        using ClosedCallback = std::function<void(const PtrConnection&)>;
        using AnyEventCallback = std::function<void(const PtrConnection&)>;
        using Functor = std::function<void()>;
        ConnectedCallback _connected_callback;
        MessageCallback _message_callback;
        ClosedCallback _closed_callback;
        AnyEventCallback _event_callback;
    private:
        void RunAfterInLoop(const Functor &task, int delay) {
            _next_id++;
            _baseloop.TimerAdd(_next_id, delay, task);
        }
        //为新连接构造一个Connection进行管理
        void NewConnection(int fd) {
            _next_id++;
            PtrConnection conn(new Connection(_pool.NextLoop(), _next_id, fd));
            conn->SetMessageCallback(_message_callback);
            conn->SetClosedCallback(_closed_callback);
            conn->SetConnectedCallback(_connected_callback);
            conn->SetAnyEventCallback(_event_callback);
            conn->SetSrvClosedCallback(std::bind(&TcpServer::RemoveConnection, this, std::placeholders::_1));
            if (_enable_inactive_release) conn->EnableInactiveRelease(_timeout);//启动非活跃超时销毁
            conn->Established();//就绪初始化
            _conns.insert(std::make_pair(_next_id, conn));
        }
        void RemoveConnectionInLoop(const PtrConnection &conn) {
            int id = conn->Id();
            auto it = _conns.find(id);
            if (it != _conns.end()) {
                _conns.erase(it);
            }
        }
        //从管理Connection的_conns中移除连接信息
        void RemoveConnection(const PtrConnection &conn) {
            _baseloop.RunInLoop(std::bind(&TcpServer::RemoveConnectionInLoop, this, conn));
        }
    public:
        TcpServer(int port):
            _port(port), 
            _next_id(0), 
            _enable_inactive_release(false), 
            _acceptor(&_baseloop, port),
            _pool(&_baseloop) {
            _acceptor.SetAcceptCallback(std::bind(&TcpServer::NewConnection, this, std::placeholders::_1));
            _acceptor.Listen();//将监听套接字挂到baseloop上
        }
        void SetThreadCount(int count) { return _pool.SetThreadCount(count); }
        void SetConnectedCallback(const ConnectedCallback&cb) { _connected_callback = cb; }
        void SetMessageCallback(const MessageCallback&cb) { _message_callback = cb; }
        void SetClosedCallback(const ClosedCallback&cb) { _closed_callback = cb; }
        void SetAnyEventCallback(const AnyEventCallback&cb) { _event_callback = cb; }
        void EnableInactiveRelease(int timeout) { _timeout = timeout; _enable_inactive_release = true; }
        //用于添加一个定时任务
        void RunAfter(const Functor &task, int delay) {
            _baseloop.RunInLoop(std::bind(&TcpServer::RunAfterInLoop, this, task, delay));
        }
        void Start() { _pool.Create();  _baseloop.Start(); }
};


void Channel::Remove() { return _loop->RemoveEvent(this); }
void Channel::Update() { return _loop->UpdateEvent(this); }
void TimerWheel::TimerAdd(uint64_t id, uint32_t delay, const TaskFunc &cb) {
    _loop->RunInLoop(std::bind(&TimerWheel::TimerAddInLoop, this, id, delay, cb));
}
//刷新/延迟定时任务
void TimerWheel::TimerRefresh(uint64_t id) {
    _loop->RunInLoop(std::bind(&TimerWheel::TimerRefreshInLoop, this, id));
}
void TimerWheel::TimerCancel(uint64_t id) {
    _loop->RunInLoop(std::bind(&TimerWheel::TimerCancelInLoop, this, id));
}


class NetWork {
    public:
        NetWork() {
            DBG_LOG("SIGPIPE INIT");
            signal(SIGPIPE, SIG_IGN);
        }
};
static NetWork nw;
#endif

httplib.h(第三方库)

cppjieba(第三方库)

目录结构

在这里插入图片描述


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