一個簡單的HTTP服務器的實現
我們繼續我們的HTTP服務器的實現（使用別的代碼來實現），
這個HTTP服務器的實現，我們主要就是關注TCP服務器中的recv還有send的處理。
首先，看一下HTTP，我們在用瀏覽器訪問我們的TCPserver的時候，會收到什么樣的請求。
這是直接訪問端口的時候，返回的數據，我們在隨便輸入一個地址測試一下。
可以發現一個特點，就是我們在當訪問http://192.168.149.131:8888/get的時候，可以得到/get，因此我們在接受到請求的時候，就可以進行第一行的解析，
int readline(char* allbuf,int idx,char * linebuf){
int len=strlen(allbuf);
for (idx < len; idx++)
{
/* code */
if (;allbuf[idx]=='\r'||allbuf[idx+1]=='\n')
{
return idx+2;
}else{
*(linebuf++)=allbuf[idx];
}
}
}
然后就是開始定義我們一些需要的結構體之類的
#define BUFFER_LENGTH 1024
#define MAX_EPOLL_EVENTS 1024
#define RESOURCE_LENGTH 1024
#define SERVER_PORT 8888
#define PORT_COUNT 1
#define HTTP_METHOD_GET 0
#define HTTP_METHOD_POST 1
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];
char wbuffer[BUFFER_LENGTH];
int length;
int wlength;
//long last_active;
//about http
int method;
char resource[RESOURCE_LENGTH];
};
開始處理我們的GET請求的代碼
int my_http_request(struct ntyevent * ev){
char lineBuffer[BUFFER_LENGTH]={0};
if (strstr(lineBuffer,"GET"))
{
ev->method=HTTP_METHOD_GET;
int i=0;
while (lineBuffer[sizeof("GET "+i)]!=' ')
{
/* code */
i++;
}
lineBuffer[sizeof("GET ") + i] = '\0';
sprintf(ev->resource, "%s/%s", HTTP_WEB_ROOT, lineBuffer+sizeof("GET "));
printf("resource: %s\n", ev->resource);
}
}
然后，我們在接受到HTTP請求的時候，就是組裝我們的一下她HTTP請求的資源。
int my_http_response_get_method(struct ntyevent* ev){
printf("call my_http_response_get_method\n");
//如果是網頁的話
int len;
int filefd = open(ev->resource, O_RDONLY);
if (filefd == -1) {
len = sprintf(ev->wbuffer,
"HTTP/1.1 200 OK\r\n"
"Accept-Ranges: bytes\r\n"
"Content-Length: 78\r\n"
"Content-Type: text/html\r\n"
"Date: Sat, 06 Aug 2022 13:16:46 GMT\r\n\r\n"
"<html><head><title>0voice.king</title></head><body><h1>King</h1><body/></html>");
ev->wlength = len;
} else {
struct stat stat_buf;
fstat(filefd, &stat_buf);
close(filefd);
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, 06 Aug 2022 13:16:46 GMT\r\n\r\n", stat_buf.st_size);
ev->wlength = len;
}
return len;
}
int my_http_response(struct ntyevent * ev){
if (ev->method == HTTP_METHOD_GET) {
return my_http_response_get_method(ev);
} else if (ev->method == HTTP_METHOD_POST) {
}
}
最后我們的代碼如下：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/epoll.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <sys/time.h>
#include <sys/sendfile.h>
#define BUFFER_LENGTH 1024
#define MAX_EPOLL_EVENTS 1024
#define RESOURCE_LENGTH 1024
#define SERVER_PORT 8888
#define PORT_COUNT 1
#define HTTP_METHOD_GET 0
#define HTTP_METHOD_POST 1
#define HTTP_WEB_ROOT "/home/lwl/share/http/root"
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];
char wbuffer[BUFFER_LENGTH];
int length;
int wlength;
//long last_active;
//about http
int 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;
}
int readline(char* allbuf,int idx,char * linebuf){
int len=strlen(allbuf);
for (;idx < len; idx++)
{
/* code */
if (allbuf[idx]=='\r'||allbuf[idx+1]=='\n')
{
return idx+2;
}else{
*(linebuf++)=allbuf[idx];
}
}
}
int my_http_request(struct ntyevent * ev){
char lineBuffer[BUFFER_LENGTH]={0};
printf("CALL in my_http_request\n");
int idx = readline(ev->buffer, 0, lineBuffer);
printf("lineBuffer:%s \n",lineBuffer);
if (strstr(lineBuffer,"GET"))
{
printf("CALL in get case my_http_request\n");
ev->method=HTTP_METHOD_GET;
int i = 0;
while(lineBuffer[sizeof("GET ") + i] != ' ') i ++;
lineBuffer[sizeof("GET ") + i] = '\0';
sprintf(ev->resource, "%s/%s", HTTP_WEB_ROOT, lineBuffer+sizeof("GET "));
printf("resource: %s\n", ev->resource);
}
}
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';
my_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 my_http_response_get_method(struct ntyevent* ev){
printf("call my_http_response_get_method\n");
//如果是網頁的話
int len;
int filefd = open(ev->resource, O_RDONLY);
if (filefd == -1) {
len = sprintf(ev->wbuffer,
"HTTP/1.1 200 OK\r\n"
"Accept-Ranges: bytes\r\n"
"Content-Length: 78\r\n"
"Content-Type: text/html\r\n"
"Date: Sat, 06 Aug 2022 13:16:46 GMT\r\n\r\n"
"<html><head><title>0voice.king</title></head><body><h1>King</h1><body/></html>");
ev->wlength = len;
} else {
struct stat stat_buf;
fstat(filefd, &stat_buf);
close(filefd);
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, 06 Aug 2022 13:16:46 GMT\r\n\r\n", stat_buf.st_size);
ev->wlength = len;
}
return len;
}
int my_http_response(struct ntyevent * ev){
if (ev->method == HTTP_METHOD_GET) {
return my_http_response_get_method(ev);
} else if (ev->method == HTTP_METHOD_POST) {
}
}
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;
my_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->wbuffer);
int filefd = open(ev->resource, O_RDONLY);
struct stat stat_buf;
fstat(filefd, &stat_buf);
int flag = fcntl(fd, F_GETFL, 0);
flag &= ~O_NONBLOCK;
fcntl(fd, F_SETFL, flag);
int ret = sendfile(fd, filefd, NULL, stat_buf.st_size);
if (ret == -1) {
printf("sendfile: errno: %d\n", errno);
}
flag |= O_NONBLOCK;
fcntl(fd, F_SETFL, flag);
close(filefd);
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;
}
最后看一看，我們實現的結果是什么樣子的？
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