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,會收到什麼樣的請求。

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];
		}
		
	}
	
}

然後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);		 
	}
	

}

然後,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) {

	}
}

最後我們的代碼如下:




#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;
}

最後看一看,我們實現的結果是什麼樣子的?
{{uploading-image-962594.png(uploading...)}}

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