多路转接之poll-二、基于poll实现的服务器

时间：2024-11-12 07:06:00

main.cpp

#include "pollServer.hpp"
#include <memory>
using namespace std;
using namespace poll_ns;
std::string handle(const std::string& request){
  return request;
}
static void usage(string proc){
  cerr<<proc<<" need a port!!!!"<<endl;
}
int main(int argc,char* argv[]){
  if(argc!=2){
    usage(argv[0]);
    exit(1);
  }
  uint16_t port=atoi(argv[1]);
  //实现一个基于poll的只处理读事件的Server
  unique_ptr<pollServer> svr(new pollServer(handle,port));
  svr->init();
  svr->start();
  return 0;
}

pollServer.hpp

#pragma once
#include <iostream>
#include "sock.hpp"
#include "public.hpp"
#include <errno.h>
#include <cstring>
#include <sys/select.h>
#include <functional>
#include <poll.h>
using namespace std;
namespace poll_ns{
  class pollServer{
  private:
    static const uint16_t defaultPort=8080;
    static const int num=2048;
    static const int defaultfd=-1;
    using func_t=std::function<std::string(const std::string)>;
  public:
    //打印有效文件描述符
    void print(){
      cout<<"socket list:"<<endl;
      for(int i=0;i<num;++i){
        if(_rfds[i].fd!=defaultfd)cout<<_rfds[i].fd<<" ";
      }
      cout<<endl;
    }
    pollServer(func_t func,uint16_t port=defaultPort)
    :_func(func),_port(port),_listenSockfd(-1),_rfds(nullptr){}
    void init(){
      _listenSockfd=Sock::Socket();
      Sock::Bind(_listenSockfd,_port);
      Sock::Listen(_listenSockfd);
     _rfds=new struct pollfd[num];
      for(int i=0;i<num;++i){
        resetItem(i);
      }
      _rfds[0].fd=_listenSockfd;
      _rfds[0].events=POLLIN;
    }
    //监听套接字的读事件就绪
    void accepter(){
      //listenSockfd监听套接字的读事件就绪，也就是监听套接字下有客户端申请新连接
      string clientIp;
      uint16_t clientPort;
      int sockfd=Sock::Accept(_listenSockfd,&clientIp,&clientPort);
      if(sockfd==-1)return;
      log(NORMAL,"accept a new link from %s-%d,sockfd=%d",clientIp.c_str(),clientPort,sockfd);
      int i=0;
      for(;i<num;++i){
        if(_rfds[i].fd==defaultfd)break;
      }
      if(i==num){
        log(WARNING,"fdarray is full!!! need close fd");
        close(sockfd);
      }
      else{
        //将连接套接字文件描述符需要监视的事件加入struct pollfd数组中
        //下一次poll就可监视连接套接字的状态的了
        _rfds[i].fd=sockfd;
        _rfds[i].events=POLLIN;
        _rfds[i].revents=0;
      }
      print();
    }
    void resetItem(int i){
      _rfds[i].fd=defaultfd;
      _rfds[i].events=0;
      _rfds[i].revents=0;
    }
    //连接套接字的读事件就绪
    void recver(int pos){
      char buffer[1024];
      //不能保证读完一个完整的应用层报文
      ssize_t n=recv(_rfds[pos].fd,buffer,sizeof(buffer)-1,0);
      if(n>0){
        buffer[n]=0;
        std::cout<<"read a meassge:"<<buffer<<std::endl;
      }
      //连接被关闭
      else if(n==0){
        close(_rfds[pos].fd);
        resetItem(pos);
        std::cout<<"client close sockfd!!!"<<std::endl;
      }
      else{
        close(_rfds[pos].fd);
        resetItem(pos);
        std::cerr<<"recv error"<<std::endl;
      }
      //buffer反序列化获得request
      //func处理request,获取response
      //response反序列化，获得返回信息
      std::string response= _func(buffer);
      write(_rfds[pos].fd,response.c_str(),response.size());
    }
    //hanlderevents处理读事件
    void handlerReadevents(){
      //监听套接字的读事件就绪
      if(_rfds[0].revents&POLLIN)accepter();
      for(int i=1;i<num;++i){
        if(_rfds[i].fd==defaultfd)continue;
        //连接套接字的读事件就绪
        if(!(_rfds[i].events&POLLIN))continue;
        if(_rfds[i].revents&POLLIN)recver(i);
        //else if(){}
        //else if(){}
      }
    }
    void start(){
      //只处理读事件
      int timeout=-1;
      while(true){
        int n=poll(_rfds,num,timeout);
        switch(n){
          case 0:
          cout<<"poll timeout"<<endl;
          log(NORMAL,"poll  timeout");
          break;
          case -1:
          log(ERROR,"poll error,errno=%d,strerror=%s",errno,strerror(errno));
          break;
          default:
          //有读事件就绪
          //找到哪个套接字的读事件就绪了
          handlerReadevents();
          break;
        }
        sleep(1);
      }
    }
    ~pollServer(){
      if(_listenSockfd>0)close(_listenSockfd);
      delete[] _rfds;
    }
  private:
    int _listenSockfd;
    uint16_t _port;
    struct pollfd* _rfds;
    func_t _func;
  };
}

sock.hpp

#pragma oncce 
#include <iostream>
#include <string>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <strings.h>
#include <unistd.h>
#include <sys/wait.h>
#include "Log.hpp"
#include "public.hpp"
using namespace std;

class Sock{
  static const int backlog=5;
public:
  //创建套接字文件描述符
  static int Socket(){
    int sockfd=socket(AF_INET,SOCK_STREAM,0);
    if(sockfd==-1){
      log(ERROR,"create a  socket error");
      exit(SOCKET_ERR);
    }
    else log(NORMAL,"create socket success, sockfd=%d",sockfd);
    //地址复用
    int opt=1;
    setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR|SO_REUSEPORT,&opt,sizeof(opt));
    return sockfd;
  }
  //给套接字绑定端口号
  static void Bind(int sockfd,uint16_t port){
    struct sockaddr_in local;
    socklen_t len=sizeof(local);
    bzero(&local,len);
    local.sin_family=AF_INET;
    local.sin_addr.s_addr=INADDR_ANY;
    local.sin_port=htons(port);
    int n=bind(sockfd,(const struct sockaddr*)&local,len);
    if(n==-1){
      log(ERROR,"bind sockfd error");
      exit(BIND_ERR);
    }
    else log(NORMAL,"bind sockfd success");
  }
  //监听套接字
  static void Listen(int sockfd){
    int n=listen(sockfd,backlog);
    if(n==-1){
      log(ERROR,"listen sockfd error");
      exit(BIND_ERR);
    }
    else log(NORMAL,"listen sockfd success");
  }
  //获取新连接套接字
  static int Accept(int listenSockfd,string* clientIp,uint16_t* clientPort){
    struct sockaddr_in client;
    socklen_t len=sizeof(client);
    bzero(&client,len);
    int sockfd=accept(listenSockfd,(struct sockaddr*)&client,&len);
    if(sockfd==-1)log(ERROR,"accept sockfd error");
    else {
      log(NORMAL,"accept a link socket=%d",sockfd);
      *clientIp=inet_ntoa(client.sin_addr);
      *clientPort=ntohs(client.sin_port);
    }
    return sockfd;
  }
};

Log.hpp

#pragma once
#include <iostream>
#include <time.h>
#include <stdarg.h>
#include <cstdio>
#define NORMAL 0
#define DEBUG 1
#define WARNING 2
#define ERROR 3
#define FATAL 4
using namespace std;
class LogMessage{
private:
  string log_path="./log.txt";
  string err_path="./err.txt";
  static string getLevel(int level){
    switch(level){
      case NORMAL:
      return "NORMAL";
      break;
      case DEBUG:
      return "DEBUG";
      break;
      case WARNING:
      return "WARNING";
      break;
      case ERROR:
      return "ERROR";
      break;
      case FATAL:
      return "FATAL";
      break;
      default:
      return "OTHER";
    }
  }
  string getTime(){
    time_t now=time(nullptr);
    struct tm* t=localtime(&now);
    int year=t->tm_year+1900;
    int mon=t->tm_mon+1;
    int day=t->tm_mday;
    int hour=t->tm_hour;
    int min=t->tm_min;
    int sec=t->tm_sec;
    char buffer[64];
    sprintf(buffer,"%d-%02d-%02d %02d:%02d:%02d",year,mon,day,hour,min,sec);
    return buffer;
  }
public:
  void operator()(int level,const char* format,...){
    string lev=getLevel(level);
    string time=getTime();
    va_list list;
    va_start(list,format);
    char msg[1024];
    vsnprintf(msg,sizeof(msg),format,list);
    FILE* log=fopen(log_path.c_str(),"a+");
    FILE* err=fopen(err_path.c_str(),"a+");
    if(log!=nullptr&&err!=nullptr){
      FILE* cur=nullptr;
      if(level==NORMAL||level==DEBUG){
        cur=log;
      }
      else cur=err;
      fprintf(cur,"[%s][%s][%s]\n",lev.c_str(),time.c_str(),msg);
      fclose(log);
      fclose(err);
    }                                                                                                                            
  }
};
static LogMessage log;

public.hpp

#pragma once
#include <iostream>
enum{SOCKET_ERR=1,BIND_ERR,LISTEN_ERR,ACCEPT_ERR,USAGE_ERR};

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