libevent http post 服务器

libevent 作为开源的以事件为驱动的处理框架，有着广阔的用途。

int httpserver_bindsocket(int port, int backlog);//绑定端口
int httpserver_start(int port, int nthreads, int backlog);//server 开始
void* httpserver_Dispatch(void *arg);//等待事件发生
void httpserver_GenericHandler(struct evhttp_request *req, void *arg);//事件发生句柄
void httpserver_ProcessRequest(struct evhttp_request *req);//处理事件
void initDBConfig();//初始化数据库参数
char * db_ip;//查询数据库ip
char * db_name;//查询数据库登陆name
char * db_psd;//数据库登陆密码
int db_port;//数据库服务器端口
char * t_name;//数据库name

服务器所用到的数据库为mysql，直接使用mysql自带接口。程序运行时先初始化数据库参数。

运行时，先开启处理线程

int httpserver_start(int port,const int nthreads, int backlog) 
{
	int r, i;
	int nfd = httpserver_bindsocket(port, backlog);
	if (nfd < 0) 
		return -1;
	pthread_t ths[500];//处理线程
	for (i = 0; i < nthreads; i++) {
		struct event_base *base = event_base_new();
		if (base == NULL) 
			return -1;
		struct evhttp *httpd = evhttp_new(base);
		if (httpd == NULL) 
			return -1;
		r = evhttp_accept_socket(httpd, nfd);
		if (r != 0) 
			return -1;
		evhttp_set_gencb(httpd, httpserver_GenericHandler, NULL);
		r = pthread_create(&ths[i], NULL, httpserver_Dispatch, base);
		if (r != 0) 
			return -1;
	}
	for (i = 0; i < nthreads; i++) {
		pthread_join(ths[i], NULL);
	}
	return 0;
}

绑定端口：

int httpserver_bindsocket(int port, int backlog) {
#ifdef WIN32
	init_win_socket();
#endif
	int r;
	int nfd;
	nfd = socket(AF_INET, SOCK_STREAM, 0);
	if (nfd < 0) return -1;
	int one = 1;
	r = setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(int));//设置端口复用

	struct sockaddr_in addr;
	memset(&addr, 0, sizeof(addr));
	addr.sin_family = AF_INET;
	//addr.sin_addr.s_addr = INADDR_ANY;
	addr.sin_port = htons(port);

	r = bind(nfd, (struct sockaddr*)&addr, sizeof(addr));
	if (r < 0) return -1;
	r = listen(nfd, backlog);
	if (r < 0) return -1;

	//设置非阻塞
#ifdef WIN32
	unsigned long flags = 1;
	if (ioctlsocket(nfd,FIONBIO,&flags) < 0)
		return -1;
#else
	int flags;
	if ((flags = fcntl(nfd, F_GETFL, 0)) < 0
		|| fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
		return -1;
#endif
	return nfd;
}

事件处理：

void httpserver_GenericHandler(struct evhttp_request *req, void *arg) 
{
	httpserver_ProcessRequest(req);//处理句柄
}

具体实现代码： 点击打开链接