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#define _GNU_SOURCE
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/epoll.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/epoll.h>
#include <jemalloc/jemalloc.h>
#include "libaco/aco.h"
#include "sds/sds.h"
#include "list.h"
#include "log.h"
#define PORT 8080
#define LISTEN_N 50
#define EVENTS_N 50
void die (const char *msg) {
(void)msg;
log_error (" %s", msg);
log_error (" %s", strerror (errno));
exit (EXIT_FAILURE);
}
#define assertfd(FD) if (FD < 0) die (#FD " is not a valid file descriptor")
#define assert(EX) if (!(EX)) die (#EX " is false")
const char resp[] =
"HTTP/1.1 200 OK\r\n"
"Content-Length: 25\r\n"
"Content-Type: text/html\r\n"
"Connection: close\r\n"
"\r\n"
"Hello from const server\r\n";
void dostuff (int sock);
void do_aco_stuff ();
void co_cleanup (aco_t *co);
typedef struct co_ctx {
int sock;
struct aco_list *noderef;
} co_ctx_t;
int main () {
int sockfd, newsockfd;
unsigned clilen;
struct sockaddr_in serv_addr, cli_addr;
sockfd = socket(AF_INET, SOCK_STREAM, 0);
assertfd (sockfd);
int enable = 1;
assert (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &enable, sizeof(int)) >= 0);
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(PORT);
assert (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) >= 0);
struct epoll_event ev, events[EVENTS_N];
int epollfd = epoll_create1 (0);
ev.data.ptr = NULL;
ev.events = EPOLLIN | EPOLLERR;
assert (epoll_ctl (epollfd, EPOLL_CTL_ADD, sockfd, &ev) == 0);
aco_thread_init (NULL);
struct aco_list *coros = aco_list_new ();
aco_t *main_co = aco_create (NULL, NULL, 0, NULL, NULL);
aco_share_stack_t *sstk = aco_share_stack_new (0);
log_trace ("main_co: %p, sstk: %p", (void*)main_co, (void*)sstk);
listen(sockfd, LISTEN_N);
clilen = sizeof(cli_addr);
for (;;) {
int nfds = epoll_wait (epollfd, events, EVENTS_N, 3000);
if (nfds == 0) {
exit (EXIT_SUCCESS);
}
assert (nfds != -1);
log_trace ("nfds: %d", nfds);
for (int i = 0; i < nfds; ++i) {
if (events[i].data.ptr == NULL) {
newsockfd = accept4(sockfd, (struct sockaddr *) &cli_addr, &clilen, SOCK_NONBLOCK);
assertfd (newsockfd);
log_trace ("new: %d", newsockfd);
//int flags = fcntl (newsockfd, F_GETFL);
//fcntl (newsockfd, F_SETFL, flags | O_NONBLOCK);
co_ctx_t *ctx = malloc (sizeof (co_ctx_t));
ctx->sock = newsockfd;
aco_t *co = aco_create (main_co, sstk, 0, do_aco_stuff, ctx);
struct aco_list *node = aco_list_add (coros, co);
ctx->noderef = node;
log_trace("co: %p, node: %p, node->co: %p", (void*)co, (void*)node, (void*)(node->co));
log_trace("arg: %p", co->arg);
memset (&ev, 0, sizeof (ev));
ev.data.ptr = node;
ev.events = EPOLLIN | EPOLLERR;
assert (epoll_ctl (epollfd, EPOLL_CTL_ADD, newsockfd, &ev) == 0);
aco_resume (co);
co_cleanup (co);
}
else {
aco_t *co = ((struct aco_list *)events[i].data.ptr)->co;
log_trace("ev. node: %p, co: %p", events[i].data.ptr, (void*)co);
if (co->is_end)
die ("coro ended but left socket open");
else {
aco_resume (co);
co_cleanup (co);
}
}
}
}
return 0;
}
void co_cleanup (aco_t *co) {
if (!co->is_end)
return;
co_ctx_t *ctx = co->arg;
close (ctx->sock);
aco_list_remove (ctx->noderef);
free (ctx);
}
ssize_t write_sock (int sock);
int check_req_finished (sds buf);
void do_aco_stuff () {
co_ctx_t *ctx = aco_get_arg ();
sds buf = sdsempty();
for (; ;) {
const int size = 256;
char tmpbuf[size];
ssize_t rv = read (ctx->sock, tmpbuf, size);
log_trace("> received %ld bytes, errno = %d", rv, errno);
if (rv > 0) {
buf = sdscatlen (buf, tmpbuf, (size_t)rv);
sds req = sdscatrepr(sdsempty(), tmpbuf, (size_t)rv);
log_trace("> %s", req);
sdsfree (req);
}
if (rv == 0)
break;
log_trace("len(buf) = %zu, rv = %zu", sdslen(buf), (size_t)rv);
if ((rv == -1) && (errno == EAGAIN || errno == EWOULDBLOCK)) {
log_trace("gonna check");
if (check_req_finished (buf)) {
log_trace("req finished");
break;
}
else {
log_trace("yield");
aco_yield ();
}
}
}
log_trace("gonna write & close");
sdsfree (buf);
write_sock (ctx->sock);
aco_exit ();
}
inline int check_req_finished (sds buf) {
/* Check if we finished transmission (e.g. request ends with "\r\n\r\n") */
size_t len = sdslen (buf);
if (len < 4ULL)
return 0;
return strncmp (buf + (len - 4), "\r\n\r\n", 4) == 0;
}
inline ssize_t write_sock (int sock) {
return write (sock, resp, sizeof (resp) - 1);
}
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