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task.cpp
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247 lines (196 loc) · 7.65 KB
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/* file : task.cpp
* author : rayss
* date : 2022.08.10
* ------------------------------------
* blog : https://cnblogs.com/rayss
* github : https://github.com/XuanRay
* mail : [email protected]
* ------------------------------------
* description : 封装的任务，即解析客户请求（HTTP）的实现。
*/
#include <sstream>
#include <fstream>
#include <string>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <sys/epoll.h>
#include <fcntl.h>
#include <sys/sendfile.h>
#include <sys/wait.h>
#include <errno.h>
#include <iostream>
#include "task.h"
using namespace std;
/** removefd remove fd from epollfd close(fd)
* @param epollfd epoll文件描述符
* @param fd 待移除的fd
*/
void removefd( int epollfd, int fd ) {
epoll_ctl( epollfd, EPOLL_CTL_DEL, fd, 0 );
close( fd );
}
/** reset_oneshot reset fd
* @param epollfd epoll文件描述符
* @param fd 待修改的socket fd
*/
void reset_oneshot( int epoll_fd, int fd ) {
epoll_event event;
event.data.fd = fd;
event.events = EPOLLIN | EPOLLET | EPOLLONESHOT;
epoll_ctl( epoll_fd, EPOLL_CTL_MOD, fd, &event ); /* EPOLL_CTL_MOD 修改已经注册的fd的监听事件 */
}
/* 执行任务 */
void Task::doit() {
char buf[ BUFFER_SIZE ] = {0};
int r;
while( r = recv( accp_fd, buf, 1024, 0 ) ) {
if( !r ) { /* 对端正确关闭 */
cout << " browser exit.\n";
break;
}
// else if( r < 0 ) { /* 如果接收出错则继续接收数据 */
// continue;
// }
else if (r < 0) { //非阻塞方式，ET 循环接受立即按届
if (errno == EAGAIN || errno == EWOULDBLOCK) {
reset_oneshot(epoll_fd, accp_fd);
printf("EAGAIN read later\n");
break;
}
}
int start = 0;
char method[5], uri[100], version[10];
sscanf( buf, "%s %s %s", method, uri, version );
if( char *tmp = strstr( buf, "Range:" ) ) { /* Range: bytes=firstbytepos-lastbytepos */
tmp += 13;
sscanf( tmp, "%d", &start );
}
if( !strcmp( method, "GET" ) || !strcmp(method, "get") ) { // 为GET
deal_get( uri, start );
} else if( !strcmp( method, "POST" ) || !strcmp(method, "post")) { // 为POST
deal_post( uri, buf );
} else {
const char *header = "HTTP/1.1 501 Not Implemented\r\nContent-Type: text/plain;charset=utf-8\r\n\r\n";
send( accp_fd, header, strlen(header), 0 );
}
break; /* 只要处理完就退出循环，避免浏览器一直处于pending状态 */ // undo
}
// close( accp_fd );
}
/** deal_get
* @param uri get请求的uri
* @param start Range字段的firstbytepos
*/
void Task::deal_get( const string & uri, int start ) {
string filename = uri.substr(1);
if( uri == "/" || uri == "/index.html" ) {
send_file( "index.html", "text/html", start, 200, "OK" );
} else if ( uri == "/submit.html" ) {
send_file( "submit.html", "text/html", start, 200, "OK" );
} else if( uri.find( ".jpg" ) != string::npos || uri.find( ".png" ) != string::npos ) {
send_file( filename, "image/jpg", start , 200, "OK" );
} else if( uri.find( ".html" ) != string::npos ) {
send_file( filename, "text/html", start , 200, "OK" );
} else if( uri.find( ".ico" ) != string::npos ) {
send_file( filename, "image/x-icon", start , 200, "OK" );
} else if( uri.find( ".js" ) != string::npos ) {
send_file( filename, "yexy/javascript", start , 200, "OK" );
} else if( uri.find( ".css" ) != string::npos ) {
send_file( filename, "text/css", start , 200, "OK" );
} else if( uri.find( ".mp3" ) != string::npos ) {
send_file( filename, "audio/mp3", start , 200, "OK" );
} else if( uri.find( ".mp4" ) != string::npos ) {
send_file( filename, "audio/mp4", start , 200, "OK" );
} else {
send_file( filename, "text/plain", start , 200, "OK" );
}
}
/** deal_post
* @param uri 请求首部的uri
* @param buf post请求头部
*/
void Task::deal_post( const string & uri, char *buf ) {
string filename = uri.substr(1);
if( uri.find( "adder" ) != string::npos ) { //使用CGI服务器，进行加法运算
char *tmp = buf;
int len, a, b;
char *l = strstr( tmp, "Content-Length:" ); // 获取请求报文主体大小
sscanf( l, "Content-Length: %d", &len );
len = strlen( tmp ) - len;
tmp += len;
sscanf( tmp, "a=%d&b=%d", &a, &b );
sprintf(tmp, "%d+%d,%d", a, b, accp_fd); // tmp存储发送到CGI服务器的参数
/* fork产生子进程，执行CGI服务器进行计算（webServer一眼只进行解析、发送数据，不进行相关计算）*/
if( fork() == 0 ) {
// dup2( accp_fd, STDOUT_FILENO );
execl( filename.c_str(), tmp, NULL );
}
wait( NULL ); // 等待子进程结束
} else {
send_file( "html/404.html", "text/html", 0, 404, "Not Found" );
}
}
/** send_file
* @param filename 请求首部的uri中的filename
* @param type type对应response的Content-Type
* @param start Range:
* @param num 状态码
* @param info 状态原语
*/
int Task::send_file( const string & filename, const char *type,
int start, const int num, const char *info ) {
struct stat filestat;
int ret = stat( filename.c_str(), &filestat );
if( ret < 0 || !S_ISREG( filestat.st_mode ) ) { // 打开文件出错或没有该文件
// cout << "file not found : " << filename << endl;
send_file( "html/404.html", "text/html", 0, 404, "Not Found" );
return -1;
}
char header[200];
sprintf( header, "HTTP/1.1 %d %s\r\nServer: Rayss\r\nContent-Length: %d\r\nContent-Type:\
%s;charset:utf-8\r\n\r\n", num, info, int(filestat.st_size - start), type ); //undo
// send第二个参数只能是c类型字符串，不能使用string
send( accp_fd, header, strlen(header), 0 );
int fd = open( filename.c_str(), O_RDONLY );
int sum = start;
while( sum < filestat.st_size ) {
off_t t = sum;
int r = sendfile( accp_fd, fd, &t, filestat.st_size );
if( r < 0 ) {
printf("errno = %d, r = %d\n", errno, r);
// perror("sendfile : ");
if( errno == EAGAIN ) {
printf("errno is EAGAIN\n");
reset_oneshot( epoll_fd, accp_fd );
continue;
} else {
perror( "sendfile " );
close( fd );
break;
}
} else {
sum += r;
}
}
close( fd );
// printf( "sendfile finish, %d\n", accp_fd );
return 0;
}
/** get_size 获取文件的大小
* @param filename 请求首部的uri中的filename
*/
int Task::get_size( const string & filename ) {
struct stat filestat;
int ret = stat( filename.c_str(), &filestat );
if( ret < 0 ) {
cout << "file not found : " << filename << endl;
return 0;
}
return filestat.st_size;
}