基于Libevent的HTTP Server.doc
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基于Libevent的HTTP Server简单的Http Server
使用Libevent内置的http相关接口,可以很容易的构建一个Http Server,一个简单的Http Server如下:
#include event2/event.h
#include event2/buffer.h
#include event2/http.h
#include Winsock2.h
#include stdlib.h
#include stdio.h
int init_win_socket()
{
WSADATA wsaData;
if(WSAStartup(MAKEWORD(2,2) , wsaData) != 0)
{
return -1;
}
return 0;
}
void generic_handler(struct evhttp_request *req, void *arg)
{
struct evbuffer *buf = evbuffer_new();
if(!buf)
{
puts(failed to create response buffer \n);
return;
}
evbuffer_add_printf(buf, Server Responsed. Requested: %s\n, evhttp_request_get_uri(req));
evhttp_send_reply(req, HTTP_OK, OK, buf);
evbuffer_free(buf);
}
int main(int argc, char* argv[])
{
#ifdef WIN32
init_win_socket();
#endif
short http_port = 8081;
char *http_addr = ;
struct event_base * base = event_base_new();
struct evhttp * http_server = evhttp_new(base);
if(!http_server)
{
return -1;
}
int ret = evhttp_bind_socket(http_server,http_addr,http_port);
if(ret!=0)
{
return -1;
}
evhttp_set_gencb(http_server, generic_handler, NULL);
printf(http server start OK! \n);
event_base_dispatch(base);
evhttp_free(http_server);
WSACleanup();
return 0;
}
通过Libevent的接口构建一个Http Server的过程如下:
(1)初始化:在event_base上新建一个evhttp,将这个evhttp绑定到监听的IP和端口号。
(2)设置Http回调函数:使用evhttp_set_gencb设置Http Server的处理请求的回调函数。
(3)启动Http Server:等待请求进入事件循环。
在Http Server中使用定时器提供更新服务
#include event2/event.h
#include event2/buffer.h
#include event2/http.h
#include sys/stat.h
#include Winsock2.h
#include assert.h
#include string.h
#include stdlib.h
#include stdio.h
#define DEFAULT_FILE F:\\Libevent\\LibeventTest\\Debug\\sample.txt
char *filedata;
time_t lasttime = 0;
char filename[80];
int counter = 0;
struct event *loadfile_event;
struct timeval tv;
void read_file()
{
unsigned long size = 0;
char *data;
struct stat buf;
if(
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