ืืืื
ืืืืืจ ืื, ื ืืื ืืช ืืคืจืืื ืืงืื ืื ืฉื ืืืจ I/O ืืืืฆื ืืื ืคืืขื, ื ืืชืื ืืืืืฉ ืืคืืืช ื-200 ืฉืืจืืช ืงืื, ืื ืืฆืข ืชืืืื ืคืฉืื ืฉื ืฉืจืช HTTP ืืขื 40 ืืืืืื ืืงืฉืืช ืืืงื.
ืคึฐึผืชึดืืึท
- ืืืืืจ ื ืืชื ืืื ืืขืืืจ ืืืืื ืืช ืชืคืงืื ืืืจ ื-I/O, ืืืื ืืืืื ืืช ืืกืืืื ืื ืืขืช ืืฉืืืืฉ ืื.
- ื ืืจืฉ ืืืข ืืืกืืืืช ืืื ืืืืื ืืช ืืืืืจ.
ืฉืคืช ื ืื ืืกืืื ืืกืืื ืืคืืชืื ืืคืืืงืฆืืืช ืจืฉืช. - ืื ืืงืื ืืชืื ืืฉืคืช C ืื ืืจืง ืืคื (ืืืืจืืช: PDF ืืจืื)
ืืชืงื C11 ืขืืืจ ืืื ืืงืก ืืืืื ืGitHub .
ืืื ืืขืฉืืช ืืช ืื?
ืขื ืืคืืคืืืจืืืช ืืืืืจืช ืฉื ืืืื ืืจื ื, ืฉืจืชื ืืื ืืจื ื ืืืื ืืืคื ืืืกืคืจ ืจื ืฉื ืืืืืจืื ืื-ืืื ืืช, ืืืื ื ืืกื ืฉืชื ืืืฉืืช: ืืกืืืช I/O ืืืกืคืจ ืจื ืฉื ืฉืจืฉืืจื ืืขืจืืช ืืคืขืื ื-I/O ืื ืืืกื ืืฉืืืื ืขื ืืขืจืืช ืืชืจืืืช ืขื ืืืจืืขืื, ืื ืงืจืืช ืื "ืืืจืจ ืืขืจืืช" (
ืืืืฉื ืืจืืฉืื ื ืืืื ืืฆืืจืช ืฉืจืฉืืจ ืืขืจืืช ืืคืขืื ืืืฉ ืขืืืจ ืื ืืืืืจ ื ืื ืก. ืืืืกืจืื ืฉืื ืืื ืืืจืืืืช ืืจืืขื: ืืขืจืืช ืืืคืขืื ืชืฆืืจื ืืืืฉื ืจืืื
ืืืจืกื ืฉืฉืื ืชื ืืืืืฉื
ืืืืฉื ืืฉื ืืื ืืฉืชืืฉืช
ืืืืื ืืื ืืืืฉืืช ืืืื ืืื ืืืืงืื:
- ืืกืืืช ืคืขืืืืช ืงืื/ืคืื ืึฐืึทืฉืึฐืขืึนืช ืืจืืืช ืืฉืชืืฉืื ืขืืขื ืฉืืขืจืืช ืืืคืขืื ืชืืื ืชืงืื ื
ืืืืื ื ึดืื ึธืกืื ืืช IP ืืืจื ืืชืื (TCP , ืืงืื ื ืชืื ืื) ืื ืฉืื ืืืื ืืกืคืืง ืืงืื ืคื ืื ืืืืืจื ืืืชืืื ืืคื ืืืืื ืืฉืืืื ืฉืืืืจ ืืื ืืืืฆืขืืชNIC (ืฉืืืืช ื ืชืื ืื). - ืืืจืจ ืืขืจืืช ืืืจื ืืื ืื ืืืืืข ืืชืืื ืืช ืฉืืขืจืืช ืืืคืขืื ืืืจ ืื ืืช IP ืืืืืืช (TCP, ืงืืืืช ื ืชืื ืื) ืื ืืกืคืืง ืืงืื ืืืืืจื ืืชืืื ืคื ืืืืื ืืืจ ืืืื (ืฉืืืืช ื ืชืื ืื).
ืืกืืืื, ืฉืืืจืช ืฉืจืฉืืจ ืฉื ืืขืจืืช ืืคืขืื ืืื I/O ืืื ืืืืื ืฉื ืืื ืืืฉืื, ืืืืืื ืฉืืืฆืืืืช, ืืฉืจืฉืืจืื ืื ืขืืฉืื ืขืืืื ืืืขืืื (ืืืื ืืืืข ืืืื ื
ืืื ืืืจ I/O
ืืืจ ื-I/O ืคืืขื ืืฉืืื ืืื ืืืจืจ ืืืขืจืืช ืืงืื ืืืฉืชืืฉ. ืขืงืจืื ืคืขืืืชื ืืชืืืจ ืขื ืืื ืชืจืฉืื ืืืืืง ืืื:
- ืืจืฉื ืื ืืืืืืจ ืืื ืฉืืืจืืข ืืื ืืืืขื ืขื ืื ืฉืฉืงืข ืืกืืื ืืกืืื ืืืฆืข ืคืขืืืช I/O ืื ืืืกืืช.
- ืืืคื ืืืืจืืขืื ืืื ืคืื ืงืฆืื ืื ืงืจืืช ืขื ืืื ืืืจ ื-I/O ืืืฉืจ ืืืจืืข ืืชืงืื, ืืฉืจ ืืืืจ ืืื ืืืฆืข ืคืขืืืช I/O ืื ืืืกืืช.
ืืฉืื ืืฆืืื ืื ืืืจ ื-I/O ืืื ืืืืืจื ืื-ืืืจืื, ืื ืืื ืืืจ ืฉืืคืจืืข ืืืืฉื ืืืฉืชืืฉ ืืกืืืื ืืจืืืช-ืืืจืื ืืืืก ืฉื 1 ืืื: ืืืจ 1, ืืืื ืืืืืจ ืืช ืื ืืืืืช ื-CPU.
ะ ะตะฐะปะธะทะฐัะธั
ื ืืงื ืืช ืืืืฉืง ืืฆืืืืจื ืืงืืืฅ reactor.h
reactor.c
reactor.h
ืืืืื ืืช ืืืืจืืืช ืืืืืช:
ืืฆื ืืฆืืจืืช ืืืืจ.ื
typedef struct reactor Reactor;
/*
* ะฃะบะฐะทะฐัะตะปั ะฝะฐ ััะฝะบัะธั, ะบะพัะพัะฐั ะฑัะดะตั ะฒัะทัะฒะฐัััั I/O ัะตะฐะบัะพัะพะผ ะฟัะธ ะฟะพัััะฟะปะตะฝะธะธ
* ัะพะฑััะธั ะพั ัะธััะตะผะฝะพะณะพ ัะตะปะตะบัะพัะฐ.
*/
typedef void (*Callback)(void *arg, int fd, uint32_t events);
/*
* ะะพะทะฒัะฐัะฐะตั `NULL` ะฒ ัะปััะฐะต ะพัะธะฑะบะธ, ะฝะต-`NULL` ัะบะฐะทะฐัะตะปั ะฝะฐ `Reactor` ะฒ
* ะฟัะพัะธะฒะฝะพะผ ัะปััะฐะต.
*/
Reactor *reactor_new(void);
/*
* ะัะฒะพะฑะพะถะดะฐะตั ัะธััะตะผะฝัะน ัะตะปะตะบัะพั, ะฒัะต ะทะฐัะตะณะธัััะธัะพะฒะฐะฝะฝัะต ัะพะบะตัั ะฒ ะดะฐะฝะฝัะน ะผะพะผะตะฝั
* ะฒัะตะผะตะฝะธ ะธ ัะฐะผ I/O ัะตะฐะบัะพั.
*
* ะกะปะตะดัััะธะต ััะฝะบัะธะธ ะฒะพะทะฒัะฐัะฐัั -1 ะฒ ัะปััะฐะต ะพัะธะฑะบะธ, 0 ะฒ ัะปััะฐะต ััะฟะตั
ะฐ.
*/
int reactor_destroy(Reactor *reactor);
int reactor_register(const Reactor *reactor, int fd, uint32_t interest,
Callback callback, void *callback_arg);
int reactor_deregister(const Reactor *reactor, int fd);
int reactor_reregister(const Reactor *reactor, int fd, uint32_t interest,
Callback callback, void *callback_arg);
/*
* ะะฐะฟััะบะฐะตั ัะธะบะป ัะพะฑััะธะน ั ัะฐะนะผ-ะฐััะพะผ `timeout`.
*
* ะญัะฐ ััะฝะบัะธั ะฟะตัะตะดะฐัั ัะฟัะฐะฒะปะตะฝะธะต ะฒัะทัะฒะฐััะตะผั ะบะพะดั ะตัะปะธ ะพัะฒะตะดัะฝะฝะพะต ะฒัะตะผั ะฒััะปะพ
* ะธะปะธ/ะธ ะฟัะธ ะพััััััะฒะธะธ ะทะฐัะตะณะธัััะธัะพะฒะฐะฝะฝัั
ัะพะบะตัะพะฒ.
*/
int reactor_run(const Reactor *reactor, time_t timeout);
ืืื ื ืืืจ ื-I/O ืืืจืื ื GHashTable
CallbackData
(ืืื ื ืฉื ืืืคื ืืืืจืืขืื ืืืจืืืื ื ืืฉืชืืฉ ืขืืืจื).
ืืฆื Reactor ื-CallbackData
struct reactor {
int epoll_fd;
GHashTable *table; // (int, CallbackData)
};
typedef struct {
Callback callback;
void *arg;
} CallbackData;
ืืืืืขืชื, ืืคืฉืจื ื ืืช ืืืืืืช ืืืคื reactor.h
ืื ื ืืืจืืืื ืขื ืืืื ื reactor
, ืืขืื ื reactor.c
ืื ื ืืืืืจืื ืืืชื, ืืืื ืืื ืขืื ืืืืฉืชืืฉ ืืฉื ืืช ืืืคืืจืฉ ืืช ืืฉืืืช ืฉืื. ืื ืืื ืืืคืืกืื
ืคืื ืงืฆืืืช reactor_register
, reactor_deregister
ะธ reactor_reregister
ืขืืื ืืช ืจืฉืืืช ืฉืงืขื ืืขื ืืื ืืืืคืื ืืืจืืขืื ืืชืืืืื ืืืืจืจ ืืืขืจืืช ืืืืืืช ืืืืืื.
ืืฆื ืคืื ืงืฆืืืช ืจืืฉืื
#define REACTOR_CTL(reactor, op, fd, interest)
if (epoll_ctl(reactor->epoll_fd, op, fd,
&(struct epoll_event){.events = interest,
.data = {.fd = fd}}) == -1) {
perror("epoll_ctl");
return -1;
}
int reactor_register(const Reactor *reactor, int fd, uint32_t interest,
Callback callback, void *callback_arg) {
REACTOR_CTL(reactor, EPOLL_CTL_ADD, fd, interest)
g_hash_table_insert(reactor->table, int_in_heap(fd),
callback_data_new(callback, callback_arg));
return 0;
}
int reactor_deregister(const Reactor *reactor, int fd) {
REACTOR_CTL(reactor, EPOLL_CTL_DEL, fd, 0)
g_hash_table_remove(reactor->table, &fd);
return 0;
}
int reactor_reregister(const Reactor *reactor, int fd, uint32_t interest,
Callback callback, void *callback_arg) {
REACTOR_CTL(reactor, EPOLL_CTL_MOD, fd, interest)
g_hash_table_insert(reactor->table, int_in_heap(fd),
callback_data_new(callback, callback_arg));
return 0;
}
ืืืืจ ืฉืืืจ ื-I/O ืืืจื ืืช ืืืืจืืข ืขื ืืืชืืจ fd
, ืืื ืงืืจื ืืืืคื ืืืืจืืข ืืืชืืื, ืฉืืืื ืืื ืขืืืจ fd
, void
.
ืืฆื ืืช ืืคืื ืงืฆืื reactor_run()
int reactor_run(const Reactor *reactor, time_t timeout) {
int result;
struct epoll_event *events;
if ((events = calloc(MAX_EVENTS, sizeof(*events))) == NULL)
abort();
time_t start = time(NULL);
while (true) {
time_t passed = time(NULL) - start;
int nfds =
epoll_wait(reactor->epoll_fd, events, MAX_EVENTS, timeout - passed);
switch (nfds) {
// ะัะธะฑะบะฐ
case -1:
perror("epoll_wait");
result = -1;
goto cleanup;
// ะัะตะผั ะฒััะปะพ
case 0:
result = 0;
goto cleanup;
// ะฃัะฟะตัะฝะฐั ะพะฟะตัะฐัะธั
default:
// ะัะทะฒะฐัั ะพะฑัะฐะฑะพััะธะบะพะฒ ัะพะฑััะธะน
for (int i = 0; i < nfds; i++) {
int fd = events[i].data.fd;
CallbackData *callback =
g_hash_table_lookup(reactor->table, &fd);
callback->callback(callback->arg, fd, events[i].events);
}
}
}
cleanup:
free(events);
return result;
}
ืืกืืืื, ืฉืจืฉืจืช ืงืจืืืืช ืืคืื ืงืฆืืืช ืืงืื ืืืฉืชืืฉ ืชืจืื ืืช ืืฆืืจื ืืืื:
ืฉืจืช ืคืชืื ืืืื
ืขื ืื ืช ืืืืืง ืืช ืืืจ ื-I/O ืืขืืืก ืืืื, ื ืืชืื ืฉืจืช HTTP ืคืฉืื ืฉืืืื ืืื ืืงืฉื ืขื ืชืืื ื.
ืืชืืืืกืืช ืืืืจื ืืคืจืืืืงืื HTTP
ื ืืชื ืืืฉืชืืฉ ื-HTTP ืืงืืืช
ืคืืจืื ืืงืฉื
<ะะะะะะะ> <URI> <ะะะ ะกะะฏ HTTP>CRLF
<ะะะะะะะะะ 1>CRLF
<ะะะะะะะะะ 2>CRLF
<ะะะะะะะะะ N>CRLF CRLF
<ะะะะะซะ>
CRLF
ืืื ืจืฆืฃ ืฉื ืฉืชื ืชืืืื:r
ะธn
, ืืคืจืื ืืื ืืฉืืจื ืืจืืฉืื ื ืฉื ืืืงืฉื, ืืืชืจืืช ืื ืชืื ืื.<ะะะะะะะ>
- ืืื ืCONNECT
,DELETE
,GET
,HEAD
,OPTIONS
,PATCH
,POST
,PUT
,TRACE
. ืืืคืืคื ืืฉืื ืคืงืืื ืืฉืจืช ืฉืื ืGET
, ืืืืืจ "ืฉืื ืื ืืช ืชืืื ืืงืืืฅ."<URI>
-ืืืื ืืฉืื ืืืื . ืืืืืื, ืื URI =/index.html
, ืื ืืืงืื ืืืงืฉ ืืช ืืืฃ ืืจืืฉื ืฉื ืืืชืจ.<ะะะ ะกะะฏ HTTP>
- ืืจืกื ืฉื ืคืจืืืืงืื HTTP ืืคืืจืืHTTP/X.Y
. ืืืจืกื ืื ืคืืฆื ืืืืชืจ ืืืื ืืืHTTP/1.1
.<ะะะะะะะะะ N>
ืืื ืฆืื ืืคืชื-ืขืจื ืืคืืจืื<ะะะฎะง>: <ะะะะงะะะะ>
, ื ืฉืื ืืฉืจืช ืื ืืชืื ื ืืกืฃ.<ะะะะะซะ>
- ื ืชืื ืื ืื ืืจืฉืื ืขื ืืื ืืฉืจืช ืืืืฆืืข ืืคืขืืื. ืืขืชืื ืงืจืืืืช ืื ืคืฉืืJSON ืื ืื ืคืืจืื ืืืจ.
ืคืืจืื ืชืืืื
<ะะะ ะกะะฏ HTTP> <ะะะ ะกะขะะขะฃะกะ> <ะะะะกะะะะ ะกะขะะขะฃะกะ>CRLF
<ะะะะะะะะะ 1>CRLF
<ะะะะะะะะะ 2>CRLF
<ะะะะะะะะะ N>CRLF CRLF
<ะะะะะซะ>
<ะะะ ะกะขะะขะฃะกะ>
ืืื ืืกืคืจ ืืืืืฆื ืืช ืืชืืฆืื ืฉื ืืคืขืืื. ืืฉืจืช ืฉืื ื ืชืืื ืืืืืจ ืกืืืืก 200 (ืคืขืืื ืืืฆืืืช).<ะะะะกะะะะ ะกะขะะขะฃะกะ>
- ืืืฆืื ืืืจืืืช ืฉื ืงืื ืืืฆื. ืขืืืจ ืงืื ืกืืืืก 200 ืืืOK
.<ะะะะะะะะะ N>
- ืืืชืจืช ืืืืชื ืคืืจืื ืืื ืืืงืฉื. ื ืืืืจ ืืช ืืืืชืจืืชContent-Length
(ืืืื ืงืืืฅ) ืContent-Type: text/html
(ืกืื ื ืชืื ื ืืืืจ).<ะะะะะซะ>
- ื ืชืื ืื ืฉืืชืืงืฉื ืขื ืืื ืืืฉืชืืฉ. ืืืงืจื ืฉืื ื, ืื ืื ืชืื ืืชืืื ื ืคื ืืืHTML .
ืงืืืฅ http_server.c
common.h
ืืฆื ืืืืช ืืืคืืก ืฉื ืคืื ืงืฆืืืช ืืืฉืืชืฃ.h
/*
* ะะฑัะฐะฑะพััะธะบ ัะพะฑััะธะน, ะบะพัะพััะน ะฒัะทะพะฒะตััั ะฟะพัะปะต ัะพะณะพ, ะบะฐะบ ัะพะบะตั ะฑัะดะตั
* ะณะพัะพะฒ ะฟัะธะฝััั ะฝะพะฒะพะต ัะพะตะดะธะฝะตะฝะธะต.
*/
static void on_accept(void *arg, int fd, uint32_t events);
/*
* ะะฑัะฐะฑะพััะธะบ ัะพะฑััะธะน, ะบะพัะพััะน ะฒัะทะพะฒะตััั ะฟะพัะปะต ัะพะณะพ, ะบะฐะบ ัะพะบะตั ะฑัะดะตั
* ะณะพัะพะฒ ะพัะฟัะฐะฒะธัั HTTP ะพัะฒะตั.
*/
static void on_send(void *arg, int fd, uint32_t events);
/*
* ะะฑัะฐะฑะพััะธะบ ัะพะฑััะธะน, ะบะพัะพััะน ะฒัะทะพะฒะตััั ะฟะพัะปะต ัะพะณะพ, ะบะฐะบ ัะพะบะตั ะฑัะดะตั
* ะณะพัะพะฒ ะฟัะธะฝััั ัะฐััั HTTP ะทะฐะฟัะพัะฐ.
*/
static void on_recv(void *arg, int fd, uint32_t events);
/*
* ะะตัะตะฒะพะดะธั ะฒั
ะพะดััะตะต ัะพะตะดะธะฝะตะฝะธะต ะฒ ะฝะตะฑะปะพะบะธััััะธะน ัะตะถะธะผ.
*/
static void set_nonblocking(int fd);
/*
* ะะตัะฐัะฐะตั ะฟะตัะตะดะฐะฝะฝัะต ะฐัะณัะผะตะฝัั ะฒ stderr ะธ ะฒัั
ะพะดะธั ะธะท ะฟัะพัะตััะฐ ั
* ะบะพะดะพะผ `EXIT_FAILURE`.
*/
static noreturn void fail(const char *format, ...);
/*
* ะะพะทะฒัะฐัะฐะตั ัะฐะนะปะพะฒัะน ะดะตัะบัะธะฟัะพั ัะพะบะตัะฐ, ัะฟะพัะพะฑะฝะพะณะพ ะฟัะธะฝะธะผะฐัั ะฝะพะฒัะต
* TCP ัะพะตะดะธะฝะตะฝะธั.
*/
static int new_server(bool reuse_port);
ืืืืงืจื ืืคืื ืงืฆืืื ืื ืืชืืืจ ืื ืื SAFE_CALL()
ืืืคืื ืงืฆืื ืืืืืจืช fail()
. ืืืืงืจื ืืฉืืื ืืช ืืขืจื ืฉื ืืืืืื ืขื ืืฉืืืื, ืืื ืืชื ืื ื ืืื, ืงืืจื ืืคืื ืงืฆืื fail()
:
#define SAFE_CALL(call, error)
do {
if ((call) == error) {
fail("%s", #call);
}
} while (false)
ืคืื ืงืฆืื fail()
ืืืคืืก ืืช ืืืจืืืื ืืื ืฉืืืขืืจื ืืืกืืฃ (ืืื printf()
EXIT_FAILURE
:
static noreturn void fail(const char *format, ...) {
va_list args;
va_start(args, format);
vfprintf(stderr, format, args);
va_end(args);
fprintf(stderr, ": %sn", strerror(errno));
exit(EXIT_FAILURE);
}
ืคืื ืงืฆืื new_server()
ืืืืืจื ืืช ืืชืืจ ืืงืืืฅ ืฉื ืฉืงืข "ืฉืจืช" ืฉื ืืฆืจ ืขื ืืื ืงืจืืืืช ืืขืจืืช socket()
bind()
listen()
ืืฆื ืืช ืืคืื ืงืฆืื new_server().
static int new_server(bool reuse_port) {
int fd;
SAFE_CALL((fd = socket(AF_INET, SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP)),
-1);
if (reuse_port) {
SAFE_CALL(
setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &(int){1}, sizeof(int)),
-1);
}
struct sockaddr_in addr = {.sin_family = AF_INET,
.sin_port = htons(SERVER_PORT),
.sin_addr = {.s_addr = inet_addr(SERVER_IPV4)},
.sin_zero = {0}};
SAFE_CALL(bind(fd, (struct sockaddr *)&addr, sizeof(addr)), -1);
SAFE_CALL(listen(fd, SERVER_BACKLOG), -1);
return fd;
}
- ืฉืืื ืื ืฉืืฉืงืข ื ืืฆืจ ืืชืืืื ืืืฆื ืื ืืืกื ืืืืฆืขืืช ืืืื
SOCK_NONBLOCK
ืื ืฉืืคืื ืงืฆืืon_accept()
(ืงืจื ืขืื) ืฉืืืช ืืขืจืืชaccept()
ืื ืขืฆืจ ืืช ืืืฆืืข ืืฉืจืฉืืจ. - ืื
reuse_port
ืฉืืืtrue
, ืื ืคืื ืงืฆืื ืื ืชืืืืจ ืืช ืืฉืงืข ืขื ืืืคืฉืจืืช ืืืืฆืขืืชSO_REUSEPORT
ืืืฉืชืืฉ ืืืืชื ืืฆืืื ืืกืืืื ืืจืืืช ืืืืื ืืืืื (ืจืื ืกืขืืฃ "ืฉืจืช ืืจืืื ืืืืื").setsockopt()
ืื ืื ืืืจืืขืื on_accept()
ื ืงืจื ืืืืจ ืฉืืขืจืืช ืืืคืขืื ืืืฆืจืช ืืืจืืข EPOLLIN
, ืืืงืจื ืื ืืืืืจ ื ืืชื ืืงืื ืืช ืืืืืืจ ืืืืฉ. on_accept()
ืืงืื ืืืืืจ ืืืฉ, ืืขืืืจ ืืืชื ืืืฆื ืื ืืืกื ืื ืจืฉื ืืฆื ืืืคื ืืืืจืืขืื on_recv()
ืืืืจ I/O.
ืืฆื ืืช ืืคืื ืงืฆืื on_accept()
static void on_accept(void *arg, int fd, uint32_t events) {
int incoming_conn;
SAFE_CALL((incoming_conn = accept(fd, NULL, NULL)), -1);
set_nonblocking(incoming_conn);
SAFE_CALL(reactor_register(reactor, incoming_conn, EPOLLIN, on_recv,
request_buffer_new()),
-1);
}
ืื ืื ืืืจืืขืื on_recv()
ื ืงืจื ืืืืจ ืฉืืขืจืืช ืืืคืขืื ืืืฆืจืช ืืืจืืข EPOLLIN
, ืืืงืจื ืื ืืืืืจ ืฉืืืืืืจ ื ืจืฉื on_accept()
, ืืืื ืืงืื ื ืชืื ืื.
on_recv()
ืงืืจื ื ืชืื ืื ืืืืืืืจ ืขื ืฉืืงืฉืช ื-HTTP ืืชืงืืืช ืืืืืืื, ืืื ืืื ืจืืฉื ืืืคื on_send()
ืืื ืืฉืืื ืชืืืืช HTTP. ืื ืืืงืื ืื ืชืง ืืช ืืืืืืจ, ืืฉืงืข ื ืืื ืื ืกืืจ ืืืืฆืขืืช close()
ืืฆื ืืช ืืคืื ืงืฆืื on_recv()
static void on_recv(void *arg, int fd, uint32_t events) {
RequestBuffer *buffer = arg;
// ะัะธะฝะธะผะฐะตะผ ะฒั
ะพะดะฝัะต ะดะฐะฝะฝัะต ะดะพ ัะตั
ะฟะพั, ััะพ recv ะฒะพะทะฒัะฐัะธั 0 ะธะปะธ ะพัะธะฑะบั
ssize_t nread;
while ((nread = recv(fd, buffer->data + buffer->size,
REQUEST_BUFFER_CAPACITY - buffer->size, 0)) > 0)
buffer->size += nread;
// ะะปะธะตะฝั ะพะฑะพัะฒะฐะป ัะพะตะดะธะฝะตะฝะธะต
if (nread == 0) {
SAFE_CALL(reactor_deregister(reactor, fd), -1);
SAFE_CALL(close(fd), -1);
request_buffer_destroy(buffer);
return;
}
// read ะฒะตัะฝัะป ะพัะธะฑะบั, ะพัะปะธัะฝัั ะพั ะพัะธะฑะบะธ, ะฟัะธ ะบะพัะพัะพะน ะฒัะทะพะฒ ะทะฐะฑะปะพะบะธััะตั
// ะฟะพัะพะบ
if (errno != EAGAIN && errno != EWOULDBLOCK) {
request_buffer_destroy(buffer);
fail("read");
}
// ะะพะปััะตะฝ ะฟะพะปะฝัะน HTTP ะทะฐะฟัะพั ะพั ะบะปะธะตะฝัะฐ. ะขะตะฟะตัั ัะตะณะธัััะธััะตะผ ะพะฑัะฐะฑะพััะธะบะฐ
// ัะพะฑััะธะน ะดะปั ะพัะฟัะฐะฒะบะธ ะดะฐะฝะฝัั
if (request_buffer_is_complete(buffer)) {
request_buffer_clear(buffer);
SAFE_CALL(reactor_reregister(reactor, fd, EPOLLOUT, on_send, buffer),
-1);
}
}
ืื ืื ืืืจืืขืื on_send()
ื ืงืจื ืืืืจ ืฉืืขืจืืช ืืืคืขืื ืืืฆืจืช ืืืจืืข EPOLLOUT
, ืืืืืจ ืืืืืืจ ื ืจืฉื on_recv()
, ืืืื ืืฉืืื ื ืชืื ืื. ืคืื ืงืฆืื ืื ืฉืืืืช ืชืืืืช HTTP ืืืืืื HTML ืขื ืชืืื ื ืืืงืื ืืืืืจ ืืื ืืฉื ื ืืช ืืืืคื ืืืืจืืขืื ืืืืจื on_recv()
.
ืืฆื ืืช ืืคืื ืงืฆืื on_send().
static void on_send(void *arg, int fd, uint32_t events) {
const char *content = "<img "
"src="https://habrastorage.org/webt/oh/wl/23/"
"ohwl23va3b-dioerobq_mbx4xaw.jpeg">";
char response[1024];
sprintf(response,
"HTTP/1.1 200 OK" CRLF "Content-Length: %zd" CRLF "Content-Type: "
"text/html" DOUBLE_CRLF "%s",
strlen(content), content);
SAFE_CALL(send(fd, response, strlen(response), 0), -1);
SAFE_CALL(reactor_reregister(reactor, fd, EPOLLIN, on_recv, arg), -1);
}
ืืืืกืืฃ, ืืงืืืฅ http_server.c
, ืืชืคืงืื main()
ืื ื ืืืฆืจืื ืืืจ I/O ืืืืฆืขืืช reactor_new()
, ืฆืืจ ืฉืงืข ืฉืจืช ืืจืฉืื ืืืชื, ืืคืขื ืืช ืืืืจ ืืืืฆืขืืช reactor_run()
ืืืฉื ืืงื ืืืช ืืืืืง, ืืื ืื ื ืืฉืืจืจืื ืืฉืืืื ืืืืฆืืื ืืืชืืื ืืช.
ืืฆื ืืช http_server.c
#include "reactor.h"
static Reactor *reactor;
#include "common.h"
int main(void) {
SAFE_CALL((reactor = reactor_new()), NULL);
SAFE_CALL(
reactor_register(reactor, new_server(false), EPOLLIN, on_accept, NULL),
-1);
SAFE_CALL(reactor_run(reactor, SERVER_TIMEOUT_MILLIS), -1);
SAFE_CALL(reactor_destroy(reactor), -1);
}
ืืื ื ืืืืง ืฉืืื ืขืืื ืืืฆืืคื. ืงืืืคืืืฆืื (chmod a+x compile.sh && ./compile.sh
ืืฉืืจืฉ ืืคืจืืืงื) ืืืคืขื ืืช ืืฉืจืช ืฉื ืืชื ืืขืฆืื, ืคืชื
ืืืืืช ืืืฆืืขืื
ืืฆื ืืช ืืคืจื ืืืืื ืืช ืฉืื
$ screenfetch
MMMMMMMMMMMMMMMMMMMMMMMMMmds+. OS: Mint 19.1 tessa
MMm----::-://////////////oymNMd+` Kernel: x86_64 Linux 4.15.0-20-generic
MMd /++ -sNMd: Uptime: 2h 34m
MMNso/` dMM `.::-. .-::.` .hMN: Packages: 2217
ddddMMh dMM :hNMNMNhNMNMNh: `NMm Shell: bash 4.4.20
NMm dMM .NMN/-+MMM+-/NMN` dMM Resolution: 1920x1080
NMm dMM -MMm `MMM dMM. dMM DE: Cinnamon 4.0.10
NMm dMM -MMm `MMM dMM. dMM WM: Muffin
NMm dMM .mmd `mmm yMM. dMM WM Theme: Mint-Y-Dark (Mint-Y)
NMm dMM` ..` ... ydm. dMM GTK Theme: Mint-Y [GTK2/3]
hMM- +MMd/-------...-:sdds dMM Icon Theme: Mint-Y
-NMm- :hNMNNNmdddddddddy/` dMM Font: Noto Sans 9
-dMNs-``-::::-------.`` dMM CPU: Intel Core i7-6700 @ 8x 4GHz [52.0ยฐC]
`/dMNmy+/:-------------:/yMMM GPU: NV136
./ydNMMMMMMMMMMMMMMMMMMMMM RAM: 2544MiB / 7926MiB
.MMMMMMMMMMMMMMMMMMM
ืืืื ื ืืืื ืืช ืืืืฆืืขืื ืฉื ืฉืจืช ืืื ืืืื. ืืืื ื ืคืชื ืฉื ื ืืจืืื ืืื: ืืืื ื ืจืืฅ ./http_server
, ืืืืจ -
$ wrk -c100 -d1m -t8 http://127.0.0.1:18470 -H "Host: 127.0.0.1:18470" -H "Accept-Language: en-US,en;q=0.5" -H "Connection: keep-alive"
Running 1m test @ http://127.0.0.1:18470
8 threads and 100 connections
Thread Stats Avg Stdev Max +/- Stdev
Latency 493.52us 76.70us 17.31ms 89.57%
Req/Sec 24.37k 1.81k 29.34k 68.13%
11657769 requests in 1.00m, 1.60GB read
Requests/sec: 193974.70
Transfer/sec: 27.19MB
ืืฉืจืช ืืื-ืคืชืื ืฉืื ื ืืฆืืื ืืขืื ืืืขืื ื-11 ืืืืืื ืืงืฉืืช ืืืงื ืฉืืงืืจื ื-100 ืืืืืจืื. ืชืืฆืื ืื ืจืขื, ืืื ืืื ื ืืชื ืืฉืคืจ ืืืชื?
ืฉืจืช ืืจืืื ืืืืื
ืืคื ืฉืืืืืจ ืืขืื, ื ืืชื ืืืฆืืจ ืืช ืืืจ ื-I/O ืืฉืจืฉืืจืื ื ืคืจืืื, ืืืื ืื ืฆื ืืช ืื ืืืืืช ืืืขืื. ืืืื ืืืืฉื ืืช ืืืืฉื ืืื ืืคืืขื:
ืืฆื ืืช http_server_multithreaded.c
#include "reactor.h"
static Reactor *reactor;
#pragma omp threadprivate(reactor)
#include "common.h"
int main(void) {
#pragma omp parallel
{
SAFE_CALL((reactor = reactor_new()), NULL);
SAFE_CALL(reactor_register(reactor, new_server(true), EPOLLIN,
on_accept, NULL),
-1);
SAFE_CALL(reactor_run(reactor, SERVER_TIMEOUT_MILLIS), -1);
SAFE_CALL(reactor_destroy(reactor), -1);
}
}
ืขืืฉืื ืื ืืื
static Reactor *reactor;
#pragma omp threadprivate(reactor)
ืฉืืื ืื ืฉืืืจืืืื ื ืฉื ืืคืื ืงืฆืื new_server()
ืชืืืืื true
. ืื ืืืืจ ืฉืื ืื ื ืืงืฆืื ืืช ืืืคืฉืจืืช ืืฉืงืข ืืฉืจืช SO_REUSEPORT
ืจืืฆื ืฉื ืื
ืขืืฉืื ืืืื ื ืืืื ืืช ืืืืฆืืขืื ืฉื ืฉืจืช ืืจืืื ืืืืื ืฉืจืฉืจืช:
$ wrk -c100 -d1m -t8 http://127.0.0.1:18470 -H "Host: 127.0.0.1:18470" -H "Accept-Language: en-US,en;q=0.5" -H "Connection: keep-alive"
Running 1m test @ http://127.0.0.1:18470
8 threads and 100 connections
Thread Stats Avg Stdev Max +/- Stdev
Latency 1.14ms 2.53ms 40.73ms 89.98%
Req/Sec 79.98k 18.07k 154.64k 78.65%
38208400 requests in 1.00m, 5.23GB read
Requests/sec: 635876.41
Transfer/sec: 89.14MB
ืืกืคืจ ืืืงืฉืืช ืฉืขืืืื ืืืงื ืืืช ืืื ืคื ~1! ืืื ืืกืจ ืื ื ืจืง 3.28 ืืืืืื ืืืืกืคืจ ืืขืืื, ืื ืืืื ื ื ืกื ืืชืงื ืืช ืื.
ืจืืฉืืช ืืืื ื ืกืชืื ืขื ืืกืืืืกืืืงื ืฉื ืืฆืจื
$ sudo perf stat -B -e task-clock,context-switches,cpu-migrations,page-faults,cycles,instructions,branches,branch-misses,cache-misses ./http_server_multithreaded
Performance counter stats for './http_server_multithreaded':
242446,314933 task-clock (msec) # 4,000 CPUs utilized
1โฏ813โฏ074 context-switches # 0,007 M/sec
4โฏ689 cpu-migrations # 0,019 K/sec
254 page-faults # 0,001 K/sec
895โฏ324โฏ830โฏ170 cycles # 3,693 GHz
621โฏ378โฏ066โฏ808 instructions # 0,69 insn per cycle
119โฏ926โฏ709โฏ370 branches # 494,653 M/sec
3โฏ227โฏ095โฏ669 branch-misses # 2,69% of all branches
808โฏ664 cache-misses
60,604330670 seconds time elapsed
-march=native
, MAX_EVENTS
ืืืืฉืชืืฉ EPOLLET
ืื ื ืชื ืขืืืื ืืฉืืขืืชืืช ืืืืฆืืขืื. ืืื ืื ืงืืจื ืื ืืืืืืื ืืช ืืกืคืจ ืืืืืืจืื ืื ืืื ืืช?
ืกืืืืกืืืงื ืขืืืจ 352 ืืืืืจืื ืื ืืื ืืช:
$ wrk -c352 -d1m -t8 http://127.0.0.1:18470 -H "Host: 127.0.0.1:18470" -H "Accept-Language: en-US,en;q=0.5" -H "Connection: keep-alive"
Running 1m test @ http://127.0.0.1:18470
8 threads and 352 connections
Thread Stats Avg Stdev Max +/- Stdev
Latency 2.12ms 3.79ms 68.23ms 87.49%
Req/Sec 83.78k 12.69k 169.81k 83.59%
40006142 requests in 1.00m, 5.48GB read
Requests/sec: 665789.26
Transfer/sec: 93.34MB
ืืชืงืืื ืืชืืฆืื ืืจืฆืืื, ืืืืชื ืืจืฃ ืืขื ืืื ืืืจืื ืืช ืืชืืืช ืฉื ืืกืคืจ ืืืงืฉืืช ืืืขืืืืืช ืืืงื ืืืช ืืืกืคืจ ืืืืืืจืื:
ืื ื ืจืืืื ืฉืืืจื ืืื ืืืืช ืืืืืจืื, ืืกืคืจ ืืืงืฉืืช ืืืขืืืืืช ืขืืืจ ืฉื ื ืืฉืจืชืื ืืืจื ืืืืืช (ืืืจืกืช ืจืืืื ืืืืืืื ืื ืืืื ืืืชืจ). ืืื ืื ืงืฉืืจ ืืืืืืฉ ืืืกื ืืช TCP/IP ืฉื Linux? ืื ืชืืกืก ืืืชืื ืืช ืืื ืืืช ืฉืื ืืืื ืืชื ืืืืช ืื ืฉื ืืืจืฃ ืืืืคืืืืืืฆืืืช ืืืคืฉืจืืืืช ืืจืืื ืืืืื ืืฉืจืฉืืจ ืืืื ืืืขืจืืช.
ืืื
ืืกืจืื ืืช ืฉื ืืืจ I/O
ืืชื ืฆืจืื ืืืืื ืฉืืืจ ื-I/O ืืื ื ืืฃ ืืืกืจืื ืืชืื, ืืืืืจ:
- ืืฉืืืืฉ ืืืืจ ืงืื/ืคืื ืืกืืืื ืืจืืืช ืคืชืืืื ืืื ืงืฆืช ืืืชืจ ืงืฉื, ืืืืืื ืชืฆืืจื ืื ืื ืืช ืืืจืืืืช ืืืืคื ืืื ื.
- ืืชืจืืื ืืจืื ืฉืืจืื ืืืงืจืื ืืขืืืก ืืื ื ืืืื, ืื ืฉืืืื ืืืืืื ืืจืืฉืื ืฉืจืฉืืจ ืืื ืืขืื ืืืจ ืขืกืืง ืืขืืืื.
- ืื ืืืคื ืืื ืืืืจืืขืื ืืืกื ืฉืจืฉืืจ, ืื ืื ืืืจืจ ืืืขืจืืช ืขืฆืื ืืืกืื, ืื ืฉืขืืื ืืืืืื ืืืืืื ืฉืงืฉื ืืืฆืื ืืืชื.
ืคืืชืจ ืืช ืืืขืืืช ืืืื
ืืกืงื ื
ืืื ืืืืข ืืกืืืื ืืืกืข ืฉืื ื ืืืชืืืืจืื ืืืืฉืจ ืื ืืืืื ืืคืจืืคืืืื.
ืืชื ืื ืฆืจืื ืืืชืขืื ืขื ืื, ืื ืืฉ ืขืื ืืจืื ืืืฉืืช ืืขื ืืื ืืช ืื ืคืืืช ืืืชืืืช ืชืืื ืืช ืจืฉืช ืืจืืืช ืฉืื ืืช ืฉื ื ืืืืช ืืืืืจืืช. ืืขื ืืื, ืืืขืชื, ืงืืฉืืจืื ืืืืืื ืืืื.
ืืืชืจืืืช ืฉืื!
ืคืจืืืงืืื ืืขื ืืื ืื
- ืกื
ืืืืื
ืื ืขืื ืืืื ืื ืืงืจืื?
https://linux.die.net/man/7/socket https://stackoverflow.com/questions/1050222/what-is-the-difference-between-concurrency-and-parallelism http://www.kegel.com/c10k.html https://kernel.dk/io_uring.pdf https://aturon.github.io/blog/2016/09/07/futures-design/ https://tokio.rs/blog/2019-10-scheduler/ https://www.artima.com/articles/io_design_patterns.html https://habr.com/en/post/183832/
ืืงืืจ: www.habr.com