基于epoll的简单的http服务器
该http服务器已经可以处理并发连接，支持多个客户端并发访问，每个连接可以持续读写数据，当然，这只是一个简单的学习例子，还有很多bug，发表出来只是希望大家可以互相学习，我也在不断的改进，希望大家有什么意见可以多多指点，谢谢
server.h
/*
* server.h
*
* Created on: Jun 23, 2014
* Author: fangjian
*/
#ifndef SERVER_H_
#define SERVER_H_
#include "epoll_event.h"
struct web_event_t;
struct web_connection_t
{
int fd;
int state;//当前处理到哪个阶段
struct web_event_t* read_event;
struct web_event_t* write_event;
char* querybuf;
int query_start_index;//请求数据的当前指针
int query_end_index;//请求数据的下一个位置
int query_remain_len;//可用空间
char method[8];
char uri[128];
char version[16];
char host[128];
char accept[128];
char conn[20];
};
struct server
{
int epollfd;
};
void web_epoll_ctl(int epollfd,int ctl,int fd,int flag);
int setnonblocking(int fd);
void initConnection(web_connection_t* &conn);
void web_accept(struct web_connection_t* conn);
void read_request( struct web_connection_t* conn );
void process_request_line(struct web_connection_t* conn);
void process_head(struct web_connection_t* conn);
void process_body(struct web_connection_t* conn);
void send_response(struct web_connection_t* conn);
void try_to_enlarge_buffer(struct web_connection_t& conn);
void empty_event_handler(struct web_connection_t* conn);
void close_conn( struct web_connection_t* conn );
#endif /* SERVER_H_ */
server.cpp
/*
* server.cpp
*
* Created on: Jun 23, 2014
* Author: fangjian
*/
#include "server.h"
#include "epoll_event.h"
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
using namespace std;
int main(int argc,char* argv[])
{
const char* ip = "127.0.0.1";
int port = 8083;
signal(SIGPIPE,SIG_IGN);//原因：http://blog.sina.com.cn/s/blog_502d765f0100kopn.html
int listenfd = socket(AF_INET,SOCK_STREAM,0);
struct sockaddr_in address;
bzero(&address,sizeof(address));
address.sin_family = AF_INET;
inet_pton(AF_INET,ip,&address.sin_addr);
address.sin_port = htons(port);
bind(listenfd,(struct sockaddr*)&address,sizeof(address));
listen(listenfd,50);
web_connection_t* conn = NULL;
epoll_init_event(conn);
initConnection(conn);//创建一个用于接受连接的结构体
if(conn == NULL){printf("---创建监听结构体失败---\n");return -1;};//创建监听结构体
conn->fd = listenfd;
conn->read_event->handler = web_accept;
epoll_add_event(conn,EPOLLIN | EPOLLERR);
setnonblocking(listenfd);
fork();
ngx_epoll_process_events();//进入事件循环，等待事件到达
}
void initConnection(web_connection_t* &conn)
{
conn = (web_connection_t*)malloc(sizeof(web_connection_t));
conn->read_event = (web_event_t*)malloc(sizeof(web_event_t));
conn->write_event = (web_event_t*)malloc(sizeof(web_event_t));
conn->state = ACCEPT;
conn->querybuf = (char*)malloc(QUERY_INIT_LEN);
if(!conn->querybuf)
{
printf(" malloc error\n");
return;
}
conn->query_start_index = 0;
conn->query_end_index = 0;
conn->query_remain_len = QUERY_INIT_LEN;
}
int setnonblocking(int fd)
{
int old_option = fcntl(fd,F_GETFL);
int new_option = old_option | O_NONBLOCK;
fcntl(fd,F_SETFL,new_option);
return old_option;
}
void web_accept(web_connection_t* conn)
{
printf("-----------accept-------\n");
struct sockaddr * client_address;
socklen_t client_addrlength = sizeof(client_address);
int connfd = accept(conn->fd,(struct sockaddr*)&(client_address),&client_addrlength);
if(connfd == -1)
{
printf("accept error\n");
return;
}
web_connection_t* new_conn = NULL;
initConnection(new_conn);//创建一个新的连接结构体
if(new_conn == NULL){printf("---创建连接结构体失败---\n");return;};
new_conn->fd = connfd;
new_conn->state = READ;
new_conn->read_event->handler = read_request;
epoll_add_event(new_conn,EPOLLIN | EPOLLERR);
setnonblocking(connfd);
}
void read_request( struct web_connection_t* conn )
{
printf("-----------read_begin-------\n");
int len,fd = conn->fd;
while(true)
{
/* 尝试增加缓冲区空间 */
try_to_enlarge_buffer(*conn);
len= recv(fd,conn->querybuf + conn->query_end_index,conn->query_remain_len,0);
if(len < 0)
{
printf("----数据读取完毕-----\n");
break;//表示当前数据读取完毕，不是出错
}
else if(len > 0)
{
conn->query_end_index += len;
conn->query_remain_len-= len;
}
else if(len == 0)
{
printf("----连接关闭-----\n");
epoll_del_event(conn);
close_conn(conn );
return ;
}
}
cout << "-----客户端的内容是 " << endl;
cout << conn->querybuf << endl;
process_request_line(conn);
return ;
}
void process_request_line(struct web_connection_t* conn)
{
int len;
char* ptr = strpbrk(conn->querybuf + conn->query_start_index," \t");
if( !ptr)
{
printf("请求行解析失败\n");
return;
}
len = ptr - conn->querybuf - conn->query_start_index;
strncpy(conn->method,conn->querybuf + conn->query_start_index,len);
cout <<"metnod="<method<query_start_index += (len+1);
ptr = strpbrk(conn->querybuf + conn->query_start_index," \t");
if( !ptr)
{
printf("请求行解析失败\n");
return;
}
len = ptr - conn->querybuf - conn->query_start_index;
strncpy(conn->uri,conn->querybuf + conn->query_start_index,len);
cout << "uri="<uri<query_start_index += (len+1);
ptr = strpbrk(conn->querybuf,"\n");//先是回车\r,再是换行\n
if(!ptr)
{
printf("请求行解析失败\n");
return;
}
len = ptr - conn->querybuf - conn->query_start_index;
strncpy(conn->version,conn->querybuf + conn->query_start_index,len);
cout << "version="<version<query_start_index += (len+1);
cout <<"-----请求行解析完毕----------"<querybuf + conn->query_start_index,"\n");
len = end_line - conn->querybuf - conn->query_start_index;
if(len == 1)
{
printf("解析完毕\n");
conn->query_start_index += (len +1);
cout << conn->querybuf + conn->query_start_index << endl;
break;
}
else
{
if(strncasecmp(conn->querybuf+conn->query_start_index,"Host:",5) == 0)
{
strncpy(conn->host,conn->querybuf+conn->query_start_index + 6,len-6);
cout << "host="<host<querybuf+conn->query_start_index,"Accept:",7) == 0)
{
strncpy(conn->accept,conn->querybuf+conn->query_start_index + 8,len-8);
cout <<"accept="<accept <querybuf+conn->query_start_index,"Connection:",11) == 0)
{
strncpy(conn->conn,conn->querybuf+conn->query_start_index + 12,len-12);
cout <<"connection="<conn <query_start_index += (len +1);
}
}
process_body(conn);
printf("----首部解析完毕----------\n");
}
void process_body(struct web_connection_t* conn)
{
if(conn->query_start_index == conn->query_end_index)
{
printf("---包体为空----\n");
}
else
{
printf("---丢体包体-----\n");
}
conn->query_start_index = conn->query_end_index = 0;
conn->state = SEND_DATA;
conn->write_event->handler = send_response;
conn->read_event->handler = empty_event_handler;//读事件回调函数设置为空
epoll_mod_event(conn,EPOLLOUT | EPOLLERR);
}
void send_response(struct web_connection_t* conn)
{
char path[128] = "http";//根目录下的文件夹
int len = strlen(conn->uri);
memcpy(path+4,conn->uri,len);
len += 4;
path[len] = '\0';//很重要
int filefd = open(path,O_RDONLY);
if(filefd < 0)
{
cout << "无法打开该文件" <fd,filefd,NULL,stat_buf.st_size);
close(filefd);
//close(conn->fd);//如果不关闭该连接socket，则浏览器一直在加载，如何解决，保持keep-alive?
conn->state = READ;
conn->read_event->handler = read_request;
epoll_mod_event(conn,EPOLLIN | EPOLLERR);
//sleep(2);
}
void try_to_enlarge_buffer(struct web_connection_t& conn)
{
if(conn.query_remain_len < REMAIN_BUFFER)
{
int new_size = strlen(conn.querybuf) + QUERY_INIT_LEN;
conn.querybuf = (char*)realloc(conn.querybuf,new_size);
conn.query_remain_len = new_size - conn.query_end_index;
}
}
void empty_event_handler(struct web_connection_t* conn)
{
}
//关闭一个连接
void close_conn( struct web_connection_t* conn )
{
static int count = 0;
count ++;
printf("关闭第%d个连接\n",count);
close( conn->fd);
free(conn->querybuf);
free(conn->read_event);
free(conn->write_event);
free(conn);
}
epoll_event.h
/*
* event.h
*
* Created on: Jun 25, 2014
* Author: fangjian
*/
#ifndef EVENT_H_
#define EVENT_H_
#include
#include "server.h"
#define MAX_EVENT_NUMBER 10000
#define QUERY_INIT_LEN 1024
#define REMAIN_BUFFER 512
/* 以下是处理机的状态 */
#define ACCEPT 1
#define READ 2
#define QUERY_LINE 4
#define QUERY_HEAD 8
#define QUERY_BODY 16
#define SEND_DATA 32
struct web_connection_t;
typedef void (*event_handler_pt)(web_connection_t* conn);
//每一个事件都由web_event_t结构体来表示
struct web_event_t
{
/*为1时表示事件是可写的，通常情况下，它表示对应的TCP连接目前状态是可写的，也就是连接处于可以发送网络包的状态*/
unsigned write:1;
/*为1时表示此事件可以建立新的连接,通常情况下，在ngx_cycle_t中的listening动态数组中，每一个监听对象ngx_listening_t对应的读事件中
的accept标志位才会是1*/
unsigned accept:1;
//为1时表示当前事件是活跃的，这个状态对应着事件驱动模块处理方式的不同，例如：在添加事件、删除事件和处理事件时，该标志位的不同都会对应着不同的处理方式
unsigned active:1;
unsigned oneshot:1;
unsigned eof:1;//为1时表示当前处理的字符流已经结束
unsigned error:1;//为1时表示事件处理过程中出现了错误
event_handler_pt handler;//事件处理方法，每个消费者模块都是重新实现它
unsigned closed:1;//为1时表示当前事件已经关闭
};
void epoll_init_event(web_connection_t* &conn);
void epoll_add_event(web_connection_t* conn,int flag);
void epoll_mod_event(web_connection_t* conn,int flag);
void epoll_del_event(web_connection_t* conn);
int ngx_epoll_process_events();
#endif /* EVENT_H_ */
epoll_event.cpp
/*
* event.cpp
*
* Created on: Jun 25, 2014
* Author: fangjian
*/
#include "epoll_event.h"
#include
#include
#include
#include
static int ep = -1;//epoll对象的描述符,每个进程只有一个
void epoll_init_event(web_connection_t* &conn)
{
ep = epoll_create(1024);
}
/* 添加事件,conn已经设置好回调函数和fd了 */
void epoll_add_event(web_connection_t* conn,int flag)
{
epoll_event ee;
int fd = conn->fd;
ee.data.ptr = (void*)conn;
ee.events = flag;
epoll_ctl(ep,EPOLL_CTL_ADD,fd,&ee);
}
/* 修改事件,event已经设置好回调函数和fd了 */
void epoll_mod_event(web_connection_t* conn,int flag)
{
epoll_event ee;
int fd = conn->fd;
ee.data.ptr = (void*)conn;
ee.events = flag;
epoll_ctl(ep,EPOLL_CTL_MOD,fd,&ee);
}
//删除该描述符上的所有事件，若想只删除读事件或写事件，则把相应的事件设置为空函数
void epoll_del_event(web_connection_t* conn)
{
epoll_ctl( ep, EPOLL_CTL_DEL, conn->fd, 0 );//删除事件最后一个参数为0
}
//事件循环函数
int ngx_epoll_process_events()
{
epoll_event event_list[MAX_EVENT_NUMBER];
while(true)
{
int number = epoll_wait(ep,event_list,MAX_EVENT_NUMBER,-1);
printf("number=%d\n",number);
printf("当前进程ID为： %d \n",getpid());
int i;
for(i = 0;i < number;i++)
{
web_connection_t* conn = (web_connection_t*)(event_list[i].data.ptr);
int socket = conn->fd;//当前触发的fd
//读事件
if ( event_list[i].events & EPOLLIN )
{
conn->read_event->handler(conn);
}
//写事件
else if( event_list[i].events & EPOLLOUT )
{
conn->write_event->handler(conn);
}
else if( event_list[i].events & EPOLLERR )
{
}
}
}
return 0;
}
使用方法：
服务器使用方法：直接运行即可
客户端使用方法：编译客户端代码，然后 ./client 127.0.0.1 8083 5（最后一个代表客户端进程数）
本程序在linux平台下测试成功
免费代码下载地址：http://download.csdn.net/detail/fangjian1204/7575477