unix网络编程2.6——高并发服务器（六）基于epoll&&reactor实现http服务器
系列文章
阅读本文需要先阅读下面的文章：
unix网络编程1.1——TCP协议详解（一）
unix网络编程2.1——高并发服务器（一）基础——io与文件描述符、socket编程与单进程服务端客户端实现
unix网络编程2.2——高并发服务器（二）多进程与多线程实现
unix网络编程2.3——高并发服务器（三）多路IO复用之select
unix网络编程2.4——高并发服务器（四）epoll基础篇
unix网络编程2.5——高并发服务器（五）epoll进阶篇——基于epoll实现reactor
前言
在unix网络编程2.5——高并发服务器（五）epoll进阶篇——基于epoll实现reactor中，实现了reactor的demo，但是回调函数的注册和使用还未开始，本文实现了一个完整的reactor模型，并且基于此实现了一个http的demo
reactor模型
源码：server.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/epoll.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#define BUFFER_LENGTH 1024
#define MAX_EPOLL_EVENTS 1024
#define SERVER_PORT 8888
#define PORT_COUNT 100
typedef int NCALLBACK(int ,int, void*);
struct ntyevent {
int fd;
int events;
void *arg;
int (*callback)(int fd, int events, void *arg);
int status;
char buffer[BUFFER_LENGTH];
int length;
//long last_active;
};
struct eventblock {
struct eventblock *next;
struct ntyevent *events;
};
struct ntyreactor {
int epfd;
int blkcnt;
struct eventblock *evblks;
};
int recv_cb(int fd, int events, void *arg);
int send_cb(int fd, int events, void *arg);
struct ntyevent *ntyreactor_idx(struct ntyreactor *reactor, int sockfd);
void nty_event_set(struct ntyevent *ev, int fd, NCALLBACK callback, void *arg) {
ev->fd = fd;
ev->callback = callback;
ev->events = 0;
ev->arg = arg;
//ev->last_active = time(NULL);
return ;
}
int nty_event_add(int epfd, int events, struct ntyevent *ev) {
struct epoll_event ep_ev = {0, {0}};
ep_ev.data.ptr = ev;
ep_ev.events = ev->events = events;
int op;
if (ev->status == 1) {
op = EPOLL_CTL_MOD;
} else {
op = EPOLL_CTL_ADD;
ev->status = 1;
}
if (epoll_ctl(epfd, op, ev->fd, &ep_ev) < 0) {
printf("event add failed [fd=%d], events[%d]\n", ev->fd, events);
return -1;
}
return 0;
}
int nty_event_del(int epfd, struct ntyevent *ev) {
struct epoll_event ep_ev = {0, {0}};
if (ev->status != 1) {
return -1;
}
ep_ev.data.ptr = ev;
ev->status = 0;
epoll_ctl(epfd, EPOLL_CTL_DEL, ev->fd, &ep_ev);
return 0;
}
int recv_cb(int fd, int events, void *arg) {
struct ntyreactor *reactor = (struct ntyreactor*)arg;
struct ntyevent *ev = ntyreactor_idx(reactor, fd);
if (ev == NULL) return -1;
int len = recv(fd, ev->buffer, BUFFER_LENGTH, 0);
nty_event_del(reactor->epfd, ev);
if (len > 0) {
ev->length = len;
ev->buffer[len] = '\0';
printf("recv [%d]:%s\n", fd, ev->buffer);
nty_event_set(ev, fd, send_cb, reactor);
nty_event_add(reactor->epfd, EPOLLOUT, ev);
} else if (len == 0) {
nty_event_del(reactor->epfd, ev);
printf("recv_cb --> disconnect\n");
close(ev->fd);
} else {
if (errno == EAGAIN && errno == EWOULDBLOCK) { //
} else if (errno == ECONNRESET){
nty_event_del(reactor->epfd, ev);
close(ev->fd);
}
printf("recv[fd=%d] error[%d]:%s\n", fd, errno, strerror(errno));
}
return len;
}
int send_cb(int fd, int events, void *arg) {
struct ntyreactor *reactor = (struct ntyreactor*)arg;
struct ntyevent *ev = ntyreactor_idx(reactor, fd);
if (ev == NULL) return -1;
int len = send(fd, ev->buffer, ev->length, 0);
if (len > 0) {
printf("send[fd=%d], [%d]%s\n", fd, len, ev->buffer);
nty_event_del(reactor->epfd, ev);
nty_event_set(ev, fd, recv_cb, reactor);
nty_event_add(reactor->epfd, EPOLLIN, ev);
} else {
nty_event_del(reactor->epfd, ev);
close(ev->fd);
printf("send[fd=%d] error %s\n", fd, strerror(errno));
}
return len;
}
int accept_cb(int fd, int events, void *arg) {
struct ntyreactor *reactor = (struct ntyreactor*)arg;
if (reactor == NULL) return -1;
struct sockaddr_in client_addr;
socklen_t len = sizeof(client_addr);
int clientfd;
if ((clientfd = accept(fd, (struct sockaddr*)&client_addr, &len)) == -1) {
if (errno != EAGAIN && errno != EINTR) {
}
printf("accept: %s\n", strerror(errno));
return -1;
}
int flag = 0;
if ((flag = fcntl(clientfd, F_SETFL, O_NONBLOCK)) < 0) {
printf("%s: fcntl nonblocking failed, %d\n", __func__, MAX_EPOLL_EVENTS);
return -1;
}
struct ntyevent *event = ntyreactor_idx(reactor, clientfd);
if (event == NULL) return -1;
nty_event_set(event, clientfd, recv_cb, reactor);
nty_event_add(reactor->epfd, EPOLLIN, event);
printf("new connect [%s:%d], pos[%d]\n",
inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port), clientfd);
return 0;
}
int init_sock(short port) {
int fd = socket(AF_INET, SOCK_STREAM, 0);
fcntl(fd, F_SETFL, O_NONBLOCK);
struct sockaddr_in server_addr;
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_port = htons(port);
bind(fd, (struct sockaddr*)&server_addr, sizeof(server_addr));
if (listen(fd, 20) < 0) {
printf("listen failed : %s\n", strerror(errno));
return -1;
}
printf("listen server port : %d\n", port);
return fd;
}
int ntyreactor_alloc(struct ntyreactor *reactor) {
if (reactor == NULL) return -1;
if (reactor->evblks == NULL) return -1;
struct eventblock *blk = reactor->evblks;
while (blk->next != NULL) {
blk = blk->next;
}
struct ntyevent* evs = (struct ntyevent*)malloc((MAX_EPOLL_EVENTS) * sizeof(struct ntyevent));
if (evs == NULL) {
printf("ntyreactor_alloc ntyevent failed\n");
return -2;
}
memset(evs, 0, (MAX_EPOLL_EVENTS) * sizeof(struct ntyevent));
struct eventblock *block = malloc(sizeof(struct eventblock));
if (block == NULL) {
printf("ntyreactor_alloc eventblock failed\n");
return -3;
}
block->events = evs;
block->next = NULL;
blk->next = block;
reactor->blkcnt ++;
return 0;
}
struct ntyevent *ntyreactor_idx(struct ntyreactor *reactor, int sockfd) {
if (reactor == NULL) return NULL;
if (reactor->evblks == NULL) return NULL;
int blkidx = sockfd / MAX_EPOLL_EVENTS;
while (blkidx >= reactor->blkcnt) {
ntyreactor_alloc(reactor);
}
int i = 0;
struct eventblock *blk = reactor->evblks;
while (i++ != blkidx && blk != NULL) {
blk = blk->next;
}
return &blk->events[sockfd % MAX_EPOLL_EVENTS];
}
int ntyreactor_init(struct ntyreactor *reactor) {
if (reactor == NULL) return -1;
memset(reactor, 0, sizeof(struct ntyreactor));
reactor->epfd = epoll_create(1);
if (reactor->epfd <= 0) {
printf("create epfd in %s err %s\n", __func__, strerror(errno));
return -2;
}
struct ntyevent* evs = (struct ntyevent*)malloc((MAX_EPOLL_EVENTS) * sizeof(struct ntyevent));
if (evs == NULL) {
printf("create epfd in %s err %s\n", __func__, strerror(errno));
close(reactor->epfd);
return -3;
}
memset(evs, 0, (MAX_EPOLL_EVENTS) * sizeof(struct ntyevent));
struct eventblock *block = malloc(sizeof(struct eventblock));
if (block == NULL) {
free(evs);
close(reactor->epfd);
return -3;
}
block->events = evs;
block->next = NULL;
reactor->evblks = block;
reactor->blkcnt = 1;
return 0;
}
int ntyreactor_destory(struct ntyreactor *reactor) {
close(reactor->epfd);
struct eventblock *blk = reactor->evblks;
struct eventblock *blk_next;
while (blk != NULL) {
blk_next = blk->next;
free(blk->events);
free(blk);
blk = blk_next;
}
return 0;
}
int ntyreactor_addlistener(struct ntyreactor *reactor, int sockfd, NCALLBACK *acceptor) {
if (reactor == NULL) return -1;
if (reactor->evblks == NULL) return -1;
struct ntyevent *event = ntyreactor_idx(reactor, sockfd);
if (event == NULL) return -1;
nty_event_set(event, sockfd, acceptor, reactor);
nty_event_add(reactor->epfd, EPOLLIN, event);
return 0;
}
int ntyreactor_run(struct ntyreactor *reactor) {
if (reactor == NULL) return -1;
if (reactor->epfd < 0) return -1;
if (reactor->evblks == NULL) return -1;
struct epoll_event events[MAX_EPOLL_EVENTS+1];
int checkpos = 0, i;
while (1) {
int nready = epoll_wait(reactor->epfd, events, MAX_EPOLL_EVENTS, 1000);
if (nready < 0) {
printf("epoll_wait error, exit\n");
continue;
}
for (i = 0;i < nready;i ++) {
struct ntyevent *ev = (struct ntyevent*)events[i].data.ptr;
if ((events[i].events & EPOLLIN) && (ev->events & EPOLLIN)) {
ev->callback(ev->fd, events[i].events, ev->arg);
}
if ((events[i].events & EPOLLOUT) && (ev->events & EPOLLOUT)) {
ev->callback(ev->fd, events[i].events, ev->arg);
}
}
}
}
int main(int argc, char *argv[]) {
struct ntyreactor *reactor = (struct ntyreactor*)malloc(sizeof(struct ntyreactor));
ntyreactor_init(reactor);
unsigned short port = SERVER_PORT;
if (argc == 2) {
port = atoi(argv[1]);
}
int i = 0;
int sockfds[PORT_COUNT] = {0};
for (i = 0;i < PORT_COUNT;i ++) {
sockfds[i] = init_sock(port+i);
ntyreactor_addlistener(reactor, sockfds[i], accept_cb);
}
ntyreactor_run(reactor);
ntyreactor_destory(reactor);
for (i = 0;i < PORT_COUNT;i ++) {
close(sockfds[i]);
}
free(reactor);
return 0;
}
模型图
回调函数
- reactor管理的io不仅是网络io，还有磁盘、文件等io，因此需要回调函数来触发式管理io：epoll检测到io有读写事件，则对应的有读写事件的回调函数；当有读事件就绪时，触发recv_cb回调函数接受数据，并将io的回调函数重置为send_cb，并修改io的监听事件属性为写；当写事件就绪时，触发send_cb回调函数给客户端发送数据，并将io的回调函数重置为recv_cb，并修改io的监听事件属性为读。
读写事件触发条件
LT模式
-就绪事件包含EPOLLIN的条件：
刚建立连接
有数据可读
断开连接
- 就绪事件包含EPOLLOUT的条件：
内核写缓冲区未满，可写
ET模式
LT模式比较好理解，关键是ET模式。
- 就绪事件包含EPOLLIN的条件：
刚建立连接
内核接收到新数据
断开连接
- 就绪事件包含EPOLLOUT的条件：
每次注册EPOLLOUT，下一次epoll_wait返回就绪事件包含EPOLLOUT（刚注册当然可写）
内核写缓冲区从不可写变成可写
同时注册了EPOLLIN和EPOLLOUT，如果接收到新数据时可写则就绪事件既包含EPOLLIN也包含EPOLLOUT
测性能工具-wrk
关注点-qps
sendfile 零拷贝
- 本文实现了一个http服务端demo，如果客户端请求的时静态资源，比如一个index.html，在服务端需要读取index.html文件，然后send给客户端，即过程：open(用户态切内核态) -> read(内核态切用户态) -> send/write(用户态切内核态)，这个或者有3次用户态和内核态的切换，效率很低。
- sendfile时基于mmap，将用户空间的文件映射到内核空间，直接操作内核空间地址，从而实现零拷贝（0次用户空间和内核空间的切换），效率高。
参考1
参考2
sendfile配合非阻塞io使用
获取文件大小接口——fstat，不要用fseek
- fstat从inode属性中，直接获取文件大小
- fseek相当于完整遍历一遍文件，其中涉及磁盘io操作，效率低
- fstat lseek fcntl比较总结一下
基于reactor模型server.c实现http模型：server_http.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/epoll.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/sendfile.h>
#include <errno.h>
#define BUFFER_LENGTH 1024
#define MAX_EPOLL_EVENTS 1024
#define RESOURCE_LENGTH 1024
#define SERVER_PORT 8888
#define PORT_COUNT 1
typedef int NCALLBACK(int ,int, void*);
#define HTTP_METHOD_GET 0
#define HTTP_METHOD_POST 1
#define HTTP_WEB_ROOT "/home/kws/share/workspace/unix_learn/unix-advanced-programming/network/io_reuse_server/my_epoll/http_resource"
struct ntyevent {
int fd;
int events;
void *arg;
int (*callback)(int fd, int events, void *arg);
int status;
char buffer[BUFFER_LENGTH];
char wbuffer[BUFFER_LENGTH];
int length;
int wlength;
//long last_active;
// http request
int http_method;
char resource[RESOURCE_LENGTH];
};
struct eventblock {
struct eventblock *next;
struct ntyevent *events;
};
struct ntyreactor {
int epfd;
int blkcnt;
struct eventblock *evblks;
};
int recv_cb(int fd, int events, void *arg);
int send_cb(int fd, int events, void *arg);
struct ntyevent *ntyreactor_idx(struct ntyreactor *reactor, int sockfd);
void nty_event_set(struct ntyevent *ev, int fd, NCALLBACK callback, void *arg) {
ev->fd = fd;
ev->callback = callback;
ev->events = 0;
ev->arg = arg;
//ev->last_active = time(NULL);
return ;
}
int nty_event_add(int epfd, int events, struct ntyevent *ev) {
struct epoll_event ep_ev = {0, {0}};
ep_ev.data.ptr = ev;
ep_ev.events = ev->events = events;
int op;
if (ev->status == 1) {
op = EPOLL_CTL_MOD;
} else {
op = EPOLL_CTL_ADD;
ev->status = 1;
}
if (epoll_ctl(epfd, op, ev->fd, &ep_ev) < 0) {
printf("event add failed [fd=%d], events[%d]\n", ev->fd, events);
return -1;
}
return 0;
}
int nty_event_del(int epfd, struct ntyevent *ev) {
struct epoll_event ep_ev = {0, {0}};
if (ev->status != 1) {
return -1;
}
ep_ev.data.ptr = ev;
ev->status = 0;
epoll_ctl(epfd, EPOLL_CTL_DEL, ev->fd, &ep_ev);
return 0;
}
/* request 处理http请求
* location(资源): /img/flexible/logo/pc/index_gray.png
*/
int readline(char *allbuf, int idx, char *linebuf)
{
int len = strlen(allbuf);
for (; idx + 1 < len; idx++) {
if (allbuf[idx] == '\r' && allbuf[idx + 1] == '\n') {
return idx + 2;
} else {
*(linebuf++) = allbuf[idx];
}
}
return -1;
}
int nty_http_request(struct ntyevent *ev)
{
char linebuf[BUFFER_LENGTH] = {0};
int idx = readline(ev->buffer, 0, linebuf);
if (strstr(linebuf, "GET")) {
ev->http_method = HTTP_METHOD_GET;
/* 请求头: GET /img/flexible/logo/pc/index_gray.png HTTP/1.1 */
int i = 0;
while (linebuf[sizeof("GET ") + i] != ' ') i++;
linebuf[sizeof("GET ") + i] = '\0';
sprintf(ev->resource, "%s/%s", HTTP_WEB_ROOT, linebuf + sizeof("GET "));
printf("resource: %s\n", ev->resource);
} else if (strstr(linebuf, "POST")) {
ev->http_method = HTTP_METHOD_POST;
}
}
int nty_http_response_get_method(struct ntyevent *ev)
{
int len;
#if 0
len = sprintf(ev->wbuffer,
"HTTP/1.1 200 OK\r\n"
"Accept-Ranges: bytes\r\n"
"Content-Length: 76\r\n"
"Content-Type: text/html\r\n"
"Date: Sat, 03 Dec 2022 10:55:32 GMT\r\n\r\n"
"<html><head><title>kkk.lll</title></head><body><h1>KKK hi</h1><body/></html>");
ev->wlength = len;
#elif 0
int file_fd = open(ev->resource, O_RDONLY);
if (file_fd == -1) {
len = sprintf(ev->wbuffer,
"HTTP/1.1 200 OK\r\n"
"Accept-Ranges: bytes\r\n"
"Content-Length: 76\r\n"
"Content-Type: text/html\r\n"
"Date: Sat, 03 Dec 2022 10:55:32 GMT\r\n\r\n"
"<html><head><title>kkk.lll</title></head><body><h1>KKK hi</h1><body/></html>");
ev->wlength = len;
} else {
struct stat stat_buf;
fstat(file_fd, &stat_buf);
close(file_fd);
/* 请求头 */
len = sprintf(ev->wbuffer,
"HTTP/1.1 200 OK\r\n"
"Accept-Ranges: bytes\r\n"
"Content-Length: %ld\r\n"
"Content-Type: text/html\r\n"
"Date: Sat, 03 Dec 2022 10:55:32 GMT\r\n\r\n", stat_buf.st_size);
ev->wlength = len;
}
#elif 1
/* 图片 */
int file_fd = open(ev->resource, O_RDONLY);
if (file_fd == -1) {
len = sprintf(ev->wbuffer,
"HTTP/1.1 200 OK\r\n"
"Accept-Ranges: bytes\r\n"
"Content-Length: 76\r\n"
"Content-Type: text/html\r\n"
"Date: Sat, 03 Dec 2022 10:55:32 GMT\r\n\r\n"
"<html><head><title>kkk.lll</title></head><body><h1>KKK hi</h1><body/></html>");
ev->wlength = len;
} else {
struct stat stat_buf;
fstat(file_fd, &stat_buf);
close(file_fd);
/* 请求头 */
len = sprintf(ev->wbuffer,
"HTTP/1.1 200 OK\r\n"
"Accept-Ranges: bytes\r\n"
"Content-Length: %ld\r\n"
"Content-Type: image/png\r\n"
"Date: Sat, 03 Dec 2022 10:55:32 GMT\r\n\r\n", stat_buf.st_size);
ev->wlength = len;
}
#endif
return len;
}
int nty_http_response(struct ntyevent *ev)
{
// ev->http_method, ev->resource
if (ev->http_method == HTTP_METHOD_GET) {
return nty_http_response_get_method(ev);
} else if (ev->http_method == HTTP_METHOD_POST) {
}
}
/* connection 对io的操作
* sock_item --> fd, r_buf, w_buf, client_addr
* 思考：哪些客户端信息在recv之前就知道了
*/
int recv_cb(int fd, int events, void *arg) {
struct ntyreactor *reactor = (struct ntyreactor*)arg;
struct ntyevent *ev = ntyreactor_idx(reactor, fd);
if (ev == NULL) return -1;
int len = recv(fd, ev->buffer, BUFFER_LENGTH, 0);
nty_event_del(reactor->epfd, ev);
if (len > 0) {
ev->length = len;
ev->buffer[len] = '\0';
// printf("recv [fd=%d], [len=%d]:%s\n", fd, len, ev->buffer);
/* parser http header */
/* 解包的过程: decode */
nty_http_request(ev);
nty_event_set(ev, fd, send_cb, reactor);
nty_event_add(reactor->epfd, EPOLLOUT, ev);
} else if (len == 0) {
nty_event_del(reactor->epfd, ev);
printf("recv_cb --> disconnect\n");
close(ev->fd);
} else {
if (errno == EAGAIN && errno == EWOULDBLOCK) { //
} else if (errno == ECONNRESET){
nty_event_del(reactor->epfd, ev);
close(ev->fd);
}
printf("recv[fd=%d] error[%d]:%s\n", fd, errno, strerror(errno));
}
return len;
}
int send_cb(int fd, int events, void *arg) {
struct ntyreactor *reactor = (struct ntyreactor*)arg;
struct ntyevent *ev = ntyreactor_idx(reactor, fd);
if (ev == NULL) return -1;
/* 打包的过程: encode */
nty_http_response(ev);
int len = send(fd, ev->wbuffer, ev->wlength, 0);
if (len > 0) {
// printf("send[fd=%d], [%d]%s\n", fd, len, ev->buffer);
int file_fd = open(ev->resource, O_RDONLY);
printf("2 ev->resource = %s\n", ev->resource);
struct stat stat_buf;
fstat(file_fd, &stat_buf);
int flag = fcntl(fd, F_GETFL, 0);
flag &= ~O_NONBLOCK;
fcntl(fd, F_SETFL, flag);
int ret = sendfile(fd, file_fd, NULL, stat_buf.st_size);
if (ret == -1) {
printf("sendfile: errno: %d\n", errno);
}
flag |= O_NONBLOCK;
fcntl(fd, F_SETFL, flag);
close(file_fd);
// send(fd, "\r\n", 2, 0);
nty_event_del(reactor->epfd, ev);
nty_event_set(ev, fd, recv_cb, reactor);
nty_event_add(reactor->epfd, EPOLLIN, ev);
} else {
nty_event_del(reactor->epfd, ev);
close(ev->fd);
printf("send[fd=%d] error %s\n", fd, strerror(errno));
}
return len;
}
int accept_cb(int fd, int events, void *arg) {
struct ntyreactor *reactor = (struct ntyreactor*)arg;
if (reactor == NULL) return -1;
struct sockaddr_in client_addr;
socklen_t len = sizeof(client_addr);
int clientfd;
if ((clientfd = accept(fd, (struct sockaddr*)&client_addr, &len)) == -1) {
if (errno != EAGAIN && errno != EINTR) {
}
printf("accept: %s\n", strerror(errno));
return -1;
}
int flag = 0;
if ((flag = fcntl(clientfd, F_SETFL, O_NONBLOCK)) < 0) {
printf("%s: fcntl nonblocking failed, %d\n", __func__, MAX_EPOLL_EVENTS);
return -1;
}
struct ntyevent *event = ntyreactor_idx(reactor, clientfd);
if (event == NULL) return -1;
nty_event_set(event, clientfd, recv_cb, reactor);
nty_event_add(reactor->epfd, EPOLLIN, event);
printf("new connect [%s:%d], pos[%d]\n",
inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port), clientfd);
return 0;
}
int init_sock(short port) {
int fd = socket(AF_INET, SOCK_STREAM, 0);
fcntl(fd, F_SETFL, O_NONBLOCK);
struct sockaddr_in server_addr;
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_port = htons(port);
bind(fd, (struct sockaddr*)&server_addr, sizeof(server_addr));
if (listen(fd, 20) < 0) {
printf("listen failed : %s\n", strerror(errno));
return -1;
}
printf("listen server port : %d\n", port);
return fd;
}
int ntyreactor_alloc(struct ntyreactor *reactor) {
if (reactor == NULL) return -1;
if (reactor->evblks == NULL) return -1;
struct eventblock *blk = reactor->evblks;
while (blk->next != NULL) {
blk = blk->next;
}
struct ntyevent* evs = (struct ntyevent*)malloc((MAX_EPOLL_EVENTS) * sizeof(struct ntyevent));
if (evs == NULL) {
printf("ntyreactor_alloc ntyevent failed\n");
return -2;
}
memset(evs, 0, (MAX_EPOLL_EVENTS) * sizeof(struct ntyevent));
struct eventblock *block = malloc(sizeof(struct eventblock));
if (block == NULL) {
printf("ntyreactor_alloc eventblock failed\n");
return -3;
}
block->events = evs;
block->next = NULL;
blk->next = block;
reactor->blkcnt ++;
return 0;
}
struct ntyevent *ntyreactor_idx(struct ntyreactor *reactor, int sockfd) {
if (reactor == NULL) return NULL;
if (reactor->evblks == NULL) return NULL;
int blkidx = sockfd / MAX_EPOLL_EVENTS;
while (blkidx >= reactor->blkcnt) {
ntyreactor_alloc(reactor);
}
int i = 0;
struct eventblock *blk = reactor->evblks;
while (i++ != blkidx && blk != NULL) {
blk = blk->next;
}
return &blk->events[sockfd % MAX_EPOLL_EVENTS];
}
int ntyreactor_init(struct ntyreactor *reactor) {
if (reactor == NULL) return -1;
memset(reactor, 0, sizeof(struct ntyreactor));
reactor->epfd = epoll_create(1);
if (reactor->epfd <= 0) {
printf("create epfd in %s err %s\n", __func__, strerror(errno));
return -2;
}
struct ntyevent* evs = (struct ntyevent*)malloc((MAX_EPOLL_EVENTS) * sizeof(struct ntyevent));
if (evs == NULL) {
printf("create epfd in %s err %s\n", __func__, strerror(errno));
close(reactor->epfd);
return -3;
}
memset(evs, 0, (MAX_EPOLL_EVENTS) * sizeof(struct ntyevent));
struct eventblock *block = malloc(sizeof(struct eventblock));
if (block == NULL) {
free(evs);
close(reactor->epfd);
return -3;
}
block->events = evs;
block->next = NULL;
reactor->evblks = block;
reactor->blkcnt = 1;
return 0;
}
int ntyreactor_destory(struct ntyreactor *reactor) {
close(reactor->epfd);
struct eventblock *blk = reactor->evblks;
struct eventblock *blk_next;
while (blk != NULL) {
blk_next = blk->next;
free(blk->events);
free(blk);
blk = blk_next;
}
return 0;
}
int ntyreactor_addlistener(struct ntyreactor *reactor, int sockfd, NCALLBACK *acceptor) {
if (reactor == NULL) return -1;
if (reactor->evblks == NULL) return -1;
struct ntyevent *event = ntyreactor_idx(reactor, sockfd);
if (event == NULL) return -1;
nty_event_set(event, sockfd, acceptor, reactor);
nty_event_add(reactor->epfd, EPOLLIN, event);
return 0;
}
int ntyreactor_run(struct ntyreactor *reactor) {
if (reactor == NULL) return -1;
if (reactor->epfd < 0) return -1;
if (reactor->evblks == NULL) return -1;
struct epoll_event events[MAX_EPOLL_EVENTS+1];
int checkpos = 0, i;
while (1) {
int nready = epoll_wait(reactor->epfd, events, MAX_EPOLL_EVENTS, 1000);
if (nready < 0) {
printf("epoll_wait error, exit\n");
continue;
}
for (i = 0;i < nready;i ++) {
struct ntyevent *ev = (struct ntyevent*)events[i].data.ptr;
if ((events[i].events & EPOLLIN) && (ev->events & EPOLLIN)) {
ev->callback(ev->fd, events[i].events, ev->arg);
}
if ((events[i].events & EPOLLOUT) && (ev->events & EPOLLOUT)) {
ev->callback(ev->fd, events[i].events, ev->arg);
}
}
}
}
int main(int argc, char *argv[]) {
struct ntyreactor *reactor = (struct ntyreactor*)malloc(sizeof(struct ntyreactor));
ntyreactor_init(reactor);
unsigned short port = SERVER_PORT;
if (argc == 2) {
port = atoi(argv[1]);
}
int i = 0;
int sockfds[PORT_COUNT] = {0};
for (i = 0;i < PORT_COUNT;i ++) {
sockfds[i] = init_sock(port+i);
ntyreactor_addlistener(reactor, sockfds[i], accept_cb);
}
ntyreactor_run(reactor);
ntyreactor_destory(reactor);
for (i = 0;i < PORT_COUNT;i ++) {
close(sockfds[i]);
}
free(reactor);
return 0;
}
