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[evhtr] Consolidate pool threading in evthr.c

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Also reinstate check for server already running
This commit is contained in:
ejurgensen 2023-01-22 00:33:54 +01:00
parent bd6f38282c
commit 4d0c297901
9 changed files with 571 additions and 822 deletions
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1
src/Makefile.am
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@ -122,6 +122,7 @@ owntone_SOURCES = main.c \
outputs/dummy.c outputs/fifo.c outputs/rcp.c \
$(ALSA_SRC) $(PULSEAUDIO_SRC) $(CHROMECAST_SRC) \
evrtsp/rtsp.c evrtsp/evrtsp.h evrtsp/rtsp-internal.h evrtsp/log.h \
evthr.c evthr.h \
$(SPOTIFY_SRC) \
$(LASTFM_SRC) \
$(MPD_SRC) \

467
src/evthr.c Normal file
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@ -0,0 +1,467 @@
/*
------------------- Thread handling borrowed from libevhtp ---------------------
BSD 3-Clause License
Copyright (c) 2010-2018, Mark Ellzey, Nathan French, Marcus Sundberg
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <limits.h>
#include <unistd.h>
#include <pthread.h>
#include <sys/queue.h>
#include <sys/ioctl.h>
#include <event2/event.h>
#include <event2/thread.h>
#include "evthr.h"
#ifndef TAILQ_FOREACH_SAFE
#define TAILQ_FOREACH_SAFE(var, head, field, tvar) \
for ((var) = TAILQ_FIRST((head)); \
(var) && ((tvar) = TAILQ_NEXT((var), field), 1); \
(var) = (tvar))
#endif
#define _evthr_read(thr, cmd, sock) \
(recv(sock, cmd, sizeof(struct evthr_cmd), 0) == sizeof(struct evthr_cmd)) ? 1 : 0
#define EVTHR_SHARED_PIPE 1
struct evthr_cmd {
uint8_t stop;
void *args;
evthr_cb cb;
} __attribute__((packed));
struct evthr_pool {
#ifdef EVTHR_SHARED_PIPE
int rdr;
int wdr;
#endif
int nthreads;
TAILQ_HEAD(evthr_pool_slist, evthr) threads;
};
struct evthr {
int rdr;
int wdr;
char err;
struct event *event;
struct event_base *evbase;
pthread_mutex_t lock;
pthread_t *thr;
evthr_init_cb init_cb;
evthr_exit_cb exit_cb;
void *arg;
void *aux;
#ifdef EVTHR_SHARED_PIPE
int pool_rdr;
struct event *shared_pool_ev;
#endif
TAILQ_ENTRY(evthr) next;
};
static void
_evthr_read_cmd(evutil_socket_t sock, short which, void *args)
{
struct evthr *thread;
struct evthr_cmd cmd;
int stopped;
if (!(thread = (struct evthr *)args)) {
return;
}
stopped = 0;
if (_evthr_read(thread, &cmd, sock) == 1) {
stopped = cmd.stop;
if (cmd.cb != NULL) {
(cmd.cb)(thread, cmd.args, thread->arg);
}
}
if (stopped == 1) {
event_base_loopbreak(thread->evbase);
}
return;
}
static void *
_evthr_loop(void *args)
{
struct evthr *thread;
if (!(thread = (struct evthr *)args)) {
return NULL;
}
if (thread == NULL || thread->thr == NULL) {
pthread_exit(NULL);
}
thread->evbase = event_base_new();
thread->event = event_new(thread->evbase, thread->rdr,
EV_READ | EV_PERSIST, _evthr_read_cmd, args);
event_add(thread->event, NULL);
#ifdef EVTHR_SHARED_PIPE
if (thread->pool_rdr > 0) {
thread->shared_pool_ev = event_new(thread->evbase, thread->pool_rdr,
EV_READ | EV_PERSIST, _evthr_read_cmd, args);
event_add(thread->shared_pool_ev, NULL);
}
#endif
pthread_mutex_lock(&thread->lock);
if (thread->init_cb != NULL) {
(thread->init_cb)(thread, thread->arg);
}
pthread_mutex_unlock(&thread->lock);
event_base_loop(thread->evbase, 0);
pthread_mutex_lock(&thread->lock);
if (thread->exit_cb != NULL) {
(thread->exit_cb)(thread, thread->arg);
}
pthread_mutex_unlock(&thread->lock);
pthread_exit(NULL);
}
static enum evthr_res
evthr_defer(struct evthr *thread, evthr_cb cb, void *arg)
{
struct evthr_cmd cmd = {
.cb = cb,
.args = arg,
.stop = 0
};
if (send(thread->wdr, &cmd, sizeof(cmd), 0) <= 0) {
return EVTHR_RES_RETRY;
}
return EVTHR_RES_OK;
}
static enum evthr_res
evthr_stop(struct evthr *thread)
{
struct evthr_cmd cmd = {
.cb = NULL,
.args = NULL,
.stop = 1
};
if (send(thread->wdr, &cmd, sizeof(struct evthr_cmd), 0) < 0) {
return EVTHR_RES_RETRY;
}
pthread_join(*thread->thr, NULL);
return EVTHR_RES_OK;
}
struct event_base *
evthr_get_base(struct evthr * thr)
{
return thr ? thr->evbase : NULL;
}
void
evthr_set_aux(struct evthr *thr, void *aux)
{
if (thr) {
thr->aux = aux;
}
}
void *
evthr_get_aux(struct evthr *thr)
{
return thr ? thr->aux : NULL;
}
static void
evthr_free(struct evthr *thread)
{
if (thread == NULL) {
return;
}
if (thread->rdr > 0) {
close(thread->rdr);
}
if (thread->wdr > 0) {
close(thread->wdr);
}
if (thread->thr) {
free(thread->thr);
}
if (thread->event) {
event_free(thread->event);
}
#ifdef EVTHR_SHARED_PIPE
if (thread->shared_pool_ev) {
event_free(thread->shared_pool_ev);
}
#endif
if (thread->evbase) {
event_base_free(thread->evbase);
}
free(thread);
}
static struct evthr *
evthr_wexit_new(evthr_init_cb init_cb, evthr_exit_cb exit_cb, void *args)
{
struct evthr *thread;
int fds[2];
if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == -1) {
return NULL;
}
evutil_make_socket_nonblocking(fds[0]);
evutil_make_socket_nonblocking(fds[1]);
if (!(thread = calloc(1, sizeof(struct evthr)))) {
return NULL;
}
thread->thr = malloc(sizeof(pthread_t));
thread->arg = args;
thread->rdr = fds[0];
thread->wdr = fds[1];
thread->init_cb = init_cb;
thread->exit_cb = exit_cb;
if (pthread_mutex_init(&thread->lock, NULL)) {
evthr_free(thread);
return NULL;
}
return thread;
}
static int
evthr_start(struct evthr *thread)
{
if (thread == NULL || thread->thr == NULL) {
return -1;
}
if (pthread_create(thread->thr, NULL, _evthr_loop, (void *)thread)) {
return -1;
}
return 0;
}
void
evthr_pool_free(struct evthr_pool *pool)
{
struct evthr *thread;
struct evthr *save;
if (pool == NULL) {
return;
}
TAILQ_FOREACH_SAFE(thread, &pool->threads, next, save) {
TAILQ_REMOVE(&pool->threads, thread, next);
evthr_free(thread);
}
free(pool);
}
enum evthr_res
evthr_pool_stop(struct evthr_pool *pool)
{
struct evthr *thr;
struct evthr *save;
if (pool == NULL) {
return EVTHR_RES_FATAL;
}
TAILQ_FOREACH_SAFE(thr, &pool->threads, next, save) {
evthr_stop(thr);
}
return EVTHR_RES_OK;
}
static inline int
get_backlog_(struct evthr *thread)
{
int backlog = 0;
ioctl(thread->rdr, FIONREAD, &backlog);
return (int)(backlog / sizeof(struct evthr_cmd));
}
enum evthr_res
evthr_pool_defer(struct evthr_pool *pool, evthr_cb cb, void *arg)
{
#ifdef EVTHR_SHARED_PIPE
struct evthr_cmd cmd = {
.cb = cb,
.args = arg,
.stop = 0
};
if (send(pool->wdr, &cmd, sizeof(cmd), 0) == -1) {
return EVTHR_RES_RETRY;
}
return EVTHR_RES_OK;
#endif
struct evthr *thread = NULL;
struct evthr *min_thread = NULL;
int min_backlog = 0;
if (pool == NULL) {
return EVTHR_RES_FATAL;
}
if (cb == NULL) {
return EVTHR_RES_NOCB;
}
TAILQ_FOREACH(thread, &pool->threads, next) {
int backlog = get_backlog_(thread);
if (backlog == 0) {
min_thread = thread;
break;
}
if (min_thread == NULL || backlog < min_backlog) {
min_thread = thread;
min_backlog = backlog;
}
}
return evthr_defer(min_thread, cb, arg);
}
struct evthr_pool *
evthr_pool_wexit_new(int nthreads, evthr_init_cb init_cb, evthr_exit_cb exit_cb, void *shared)
{
struct evthr_pool *pool;
int i;
#ifdef EVTHR_SHARED_PIPE
int fds[2];
#endif
if (nthreads == 0) {
return NULL;
}
if (!(pool = calloc(1, sizeof(struct evthr_pool)))) {
return NULL;
}
pool->nthreads = nthreads;
TAILQ_INIT(&pool->threads);
#ifdef EVTHR_SHARED_PIPE
if (evutil_socketpair(AF_UNIX, SOCK_DGRAM, 0, fds) == -1) {
return NULL;
}
evutil_make_socket_nonblocking(fds[0]);
evutil_make_socket_nonblocking(fds[1]);
pool->rdr = fds[0];
pool->wdr = fds[1];
#endif
for (i = 0; i < nthreads; i++) {
struct evthr * thread;
if (!(thread = evthr_wexit_new(init_cb, exit_cb, shared))) {
evthr_pool_free(pool);
return NULL;
}
#ifdef EVTHR_SHARED_PIPE
thread->pool_rdr = fds[0];
#endif
TAILQ_INSERT_TAIL(&pool->threads, thread, next);
}
return pool;
}
int
evthr_pool_start(struct evthr_pool *pool)
{
struct evthr *evthr = NULL;
if (pool == NULL) {
return -1;
}
TAILQ_FOREACH(evthr, &pool->threads, next) {
if (evthr_start(evthr) < 0) {
return -1;
}
usleep(5000);
}
return 0;
}

43
src/evthr.h Normal file
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@ -0,0 +1,43 @@
#ifndef __EVTHR_H__
#define __EVTHR_H__
enum evthr_res {
EVTHR_RES_OK = 0,
EVTHR_RES_BACKLOG,
EVTHR_RES_RETRY,
EVTHR_RES_NOCB,
EVTHR_RES_FATAL
};
struct evthr_pool;
struct evthr;
typedef void (*evthr_cb)(struct evthr *thr, void *cmd_arg, void *shared);
typedef void (*evthr_init_cb)(struct evthr *thr, void *shared);
typedef void (*evthr_exit_cb)(struct evthr *thr, void *shared);
struct event_base *
evthr_get_base(struct evthr *thr);
void
evthr_set_aux(struct evthr *thr, void *aux);
void *
evthr_get_aux(struct evthr *thr);
enum evthr_res
evthr_pool_defer(struct evthr_pool *pool, evthr_cb cb, void *arg);
struct evthr_pool *
evthr_pool_wexit_new(int nthreads, evthr_init_cb init_cb, evthr_exit_cb exit_cb, void *shared);
void
evthr_pool_free(struct evthr_pool *pool);
enum evthr_res
evthr_pool_stop(struct evthr_pool *pool);
int
evthr_pool_start(struct evthr_pool *pool);
#endif /* !__EVTHR_H__ */

415
src/httpd.c
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@ -30,13 +30,11 @@
#include <pthread.h>
#include <time.h>
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdint.h>
#include <inttypes.h>
#include <sys/ioctl.h>
#include <syscall.h> // get thread ID
#include <event2/event.h>
@ -49,6 +47,7 @@
#include "conffile.h"
#include "misc.h"
#include "worker.h"
#include "evthr.h"
#include "httpd.h"
#include "httpd_internal.h"
#include "transcode.h"
@ -133,369 +132,9 @@ static int httpd_port;
#define THREADPOOL_NTHREADS 4
struct evthr_pool;
static struct evthr_pool *httpd_threadpool;
/* ----------------- Thread handling borrowed from libevhtp ----------------- */
#ifndef TAILQ_FOREACH_SAFE
#define TAILQ_FOREACH_SAFE(var, head, field, tvar) \
for ((var) = TAILQ_FIRST((head)); \
(var) && ((tvar) = TAILQ_NEXT((var), field), 1); \
(var) = (tvar))
#endif
#define _evthr_read(thr, cmd, sock) \
(recv(sock, cmd, sizeof(struct evthr_cmd), 0) == sizeof(struct evthr_cmd)) ? 1 : 0
#define EVTHR_SHARED_PIPE 1
enum evthr_res {
EVTHR_RES_OK = 0,
EVTHR_RES_BACKLOG,
EVTHR_RES_RETRY,
EVTHR_RES_NOCB,
EVTHR_RES_FATAL
};
struct evthr;
typedef void (*evthr_cb)(struct evthr *thr, void *cmd_arg, void *shared);
typedef void (*evthr_init_cb)(struct evthr *thr, void *shared);
typedef void (*evthr_exit_cb)(struct evthr *thr, void *shared);
struct evthr_cmd {
uint8_t stop;
void *args;
evthr_cb cb;
} __attribute__((packed));
struct evthr_pool {
#ifdef EVTHR_SHARED_PIPE
int rdr;
int wdr;
#endif
int nthreads;
TAILQ_HEAD(evthr_pool_slist, evthr) threads;
};
struct evthr {
int rdr;
int wdr;
char err;
struct event *event;
struct event_base *evbase;
httpd_server *server;
pthread_mutex_t lock;
pthread_t *thr;
evthr_init_cb init_cb;
evthr_exit_cb exit_cb;
void *arg;
void *aux;
#ifdef EVTHR_SHARED_PIPE
int pool_rdr;
struct event *shared_pool_ev;
#endif
TAILQ_ENTRY(evthr) next;
};
static void
_evthr_read_cmd(evutil_socket_t sock, short which, void *args)
{
struct evthr *thread;
struct evthr_cmd cmd;
int stopped;
if (!(thread = (struct evthr *)args)) {
return;
}
stopped = 0;
if (_evthr_read(thread, &cmd, sock) == 1) {
stopped = cmd.stop;
if (cmd.cb != NULL) {
(cmd.cb)(thread, cmd.args, thread->arg);
}
}
if (stopped == 1) {
event_base_loopbreak(thread->evbase);
}
return;
}
static void *
_evthr_loop(void *args)
{
struct evthr *thread;
if (!(thread = (struct evthr *)args)) {
return NULL;
}
if (thread == NULL || thread->thr == NULL) {
pthread_exit(NULL);
}
thread->evbase = event_base_new();
thread->event = event_new(thread->evbase, thread->rdr,
EV_READ | EV_PERSIST, _evthr_read_cmd, args);
event_add(thread->event, NULL);
#ifdef EVTHR_SHARED_PIPE
if (thread->pool_rdr > 0) {
thread->shared_pool_ev = event_new(thread->evbase, thread->pool_rdr,
EV_READ | EV_PERSIST, _evthr_read_cmd, args);
event_add(thread->shared_pool_ev, NULL);
}
#endif
pthread_mutex_lock(&thread->lock);
if (thread->init_cb != NULL) {
(thread->init_cb)(thread, thread->arg);
}
pthread_mutex_unlock(&thread->lock);
CHECK_ERR(L_MAIN, thread->err);
event_base_loop(thread->evbase, 0);
pthread_mutex_lock(&thread->lock);
if (thread->exit_cb != NULL) {
(thread->exit_cb)(thread, thread->arg);
}
pthread_mutex_unlock(&thread->lock);
pthread_exit(NULL);
}
static enum evthr_res
evthr_stop(struct evthr *thread)
{
struct evthr_cmd cmd = {
.cb = NULL,
.args = NULL,
.stop = 1
};
if (send(thread->wdr, &cmd, sizeof(struct evthr_cmd), 0) < 0) {
return EVTHR_RES_RETRY;
}
pthread_join(*thread->thr, NULL);
return EVTHR_RES_OK;
}
static void
evthr_free(struct evthr *thread)
{
if (thread == NULL) {
return;
}
if (thread->rdr > 0) {
close(thread->rdr);
}
if (thread->wdr > 0) {
close(thread->wdr);
}
if (thread->thr) {
free(thread->thr);
}
if (thread->event) {
event_free(thread->event);
}
#ifdef EVTHR_SHARED_PIPE
if (thread->shared_pool_ev) {
event_free(thread->shared_pool_ev);
}
#endif
if (thread->evbase) {
event_base_free(thread->evbase);
}
free(thread);
}
static struct evthr *
evthr_wexit_new(evthr_init_cb init_cb, evthr_exit_cb exit_cb, void *args)
{
struct evthr *thread;
int fds[2];
if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == -1) {
return NULL;
}
evutil_make_socket_nonblocking(fds[0]);
evutil_make_socket_nonblocking(fds[1]);
if (!(thread = calloc(1, sizeof(struct evthr)))) {
return NULL;
}
thread->thr = malloc(sizeof(pthread_t));
thread->arg = args;
thread->rdr = fds[0];
thread->wdr = fds[1];
thread->init_cb = init_cb;
thread->exit_cb = exit_cb;
if (pthread_mutex_init(&thread->lock, NULL)) {
evthr_free(thread);
return NULL;
}
return thread;
}
static int
evthr_start(struct evthr *thread)
{
if (thread == NULL || thread->thr == NULL) {
return -1;
}
if (pthread_create(thread->thr, NULL, _evthr_loop, (void *)thread)) {
return -1;
}
return 0;
}
static void
evthr_pool_free(struct evthr_pool *pool)
{
struct evthr *thread;
struct evthr *save;
if (pool == NULL) {
return;
}
TAILQ_FOREACH_SAFE(thread, &pool->threads, next, save) {
TAILQ_REMOVE(&pool->threads, thread, next);
evthr_free(thread);
}
free(pool);
}
static enum evthr_res
evthr_pool_stop(struct evthr_pool *pool)
{
struct evthr *thr;
struct evthr *save;
if (pool == NULL) {
return EVTHR_RES_FATAL;
}
TAILQ_FOREACH_SAFE(thr, &pool->threads, next, save) {
evthr_stop(thr);
}
return EVTHR_RES_OK;
}
static inline int
get_backlog_(struct evthr *thread)
{
int backlog = 0;
ioctl(thread->rdr, FIONREAD, &backlog);
return (int)(backlog / sizeof(struct evthr_cmd));
}
static struct evthr_pool *
evthr_pool_wexit_new(int nthreads, evthr_init_cb init_cb, evthr_exit_cb exit_cb, void *shared)
{
struct evthr_pool *pool;
int i;
#ifdef EVTHR_SHARED_PIPE
int fds[2];
#endif
if (nthreads == 0) {
return NULL;
}
if (!(pool = calloc(1, sizeof(struct evthr_pool)))) {
return NULL;
}
pool->nthreads = nthreads;
TAILQ_INIT(&pool->threads);
#ifdef EVTHR_SHARED_PIPE
if (evutil_socketpair(AF_UNIX, SOCK_DGRAM, 0, fds) == -1) {
return NULL;
}
evutil_make_socket_nonblocking(fds[0]);
evutil_make_socket_nonblocking(fds[1]);
pool->rdr = fds[0];
pool->wdr = fds[1];
#endif
for (i = 0; i < nthreads; i++) {
struct evthr * thread;
if (!(thread = evthr_wexit_new(init_cb, exit_cb, shared))) {
evthr_pool_free(pool);
return NULL;
}
#ifdef EVTHR_SHARED_PIPE
thread->pool_rdr = fds[0];
#endif
TAILQ_INSERT_TAIL(&pool->threads, thread, next);
}
return pool;
}
static int
evthr_pool_start(struct evthr_pool *pool)
{
struct evthr *evthr = NULL;
if (pool == NULL) {
return -1;
}
TAILQ_FOREACH(evthr, &pool->threads, next) {
if (evthr_start(evthr) < 0) {
return -1;
}
usleep(5000);
}
return 0;
}
/* -------------------------------- HELPERS --------------------------------- */
static int
@ -1747,37 +1386,44 @@ httpd_basic_auth(struct httpd_request *hreq, const char *user, const char *passw
return -1;
}
static int
bind_test(short unsigned port)
{
int fd;
fd = net_bind(&port, SOCK_STREAM, "httpd init");
if (fd < 0)
return -1;
close(fd);
return 0;
}
static void
thread_init_cb(struct evthr *thr, void *shared)
{
int ret;
struct event_base *evbase;
httpd_server *server;
thread_setname(pthread_self(), "httpd");
ret = db_perthread_init();
if (ret < 0)
{
DPRINTF(E_FATAL, L_HTTPD, "Error: DB init failed\n");
thr->err = EIO;
return;
}
thr->server = httpd_server_new(thr->evbase, httpd_port, request_cb, NULL);
if (!thr->server)
{
DPRINTF(E_FATAL, L_HTTPD, "Could not create HTTP server on port %d (server already running?)\n", httpd_port);
thr->err = EIO;
return;
}
CHECK_ERR(L_HTTPD, db_perthread_init());
CHECK_NULL(L_HTTPD, evbase = evthr_get_base(thr));
CHECK_NULL(L_HTTPD, server = httpd_server_new(evbase, httpd_port, request_cb, NULL));
// For CORS headers
httpd_server_allow_origin_set(thr->server, httpd_allow_origin);
httpd_server_allow_origin_set(server, httpd_allow_origin);
evthr_set_aux(thr, server);
}
static void
thread_exit_cb(struct evthr *thr, void *shared)
{
httpd_server_free(thr->server);
httpd_server *server;
server = evthr_get_aux(thr);
httpd_server_free(server);
db_perthread_deinit();
}
@ -1813,6 +1459,15 @@ httpd_init(const char *webroot)
if (strlen(httpd_allow_origin) == 0)
httpd_allow_origin = NULL;
// Test that the port is free. We do it here because we can make a nicer exit
// than we can in thread_init_cb(), where the actual binding takes place.
ret = bind_test(httpd_port);
if (ret < 0)
{
DPRINTF(E_FATAL, L_HTTPD, "Could not create HTTP server on port %d (server already running?)\n", httpd_port);
return -1;
}
// Prepare modules, e.g. httpd_daap
ret = modules_init();
if (ret < 0)

4
src/httpd_internal.h
View File

@ -235,9 +235,7 @@ httpd_send_reply_end(struct httpd_request *hreq);
void
httpd_send_error(struct httpd_request *hreq, int error, const char *reason);
/*
* Redirects to the given path
*/
void
httpd_redirect_to(struct httpd_request *hreq, const char *path);

2
src/httpd_libevhttp.c
View File

@ -278,7 +278,7 @@ httpd_server_new(struct event_base *evbase, unsigned short port, httpd_request_c
server->request_cb = cb;
server->request_cb_arg = arg;
server->fd = net_bind(&port, SOCK_STREAM | SOCK_NONBLOCK, "httpd");
server->fd = net_bind_with_reuseport(&port, SOCK_STREAM | SOCK_NONBLOCK, "httpd");
if (server->fd <= 0)
goto error;

21
src/misc.c
View File

@ -278,8 +278,8 @@ net_connect(const char *addr, unsigned short port, int type, const char *log_ser
// If *port is 0 then a random port will be assigned, and *port will be updated
// with the port number
int
net_bind(short unsigned *port, int type, const char *log_service_name)
static int
net_bind_impl(short unsigned *port, int type, const char *log_service_name, bool reuseport)
{
struct addrinfo hints = { 0 };
struct addrinfo *servinfo;
@ -318,7 +318,10 @@ net_bind(short unsigned *port, int type, const char *log_service_name)
continue;
// Makes us able to attach multiple threads to the same port
ret = setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &yes, sizeof(yes));
if (reuseport)
ret = setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &yes, sizeof(yes));
else
ret = setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &no, sizeof(no));
if (ret < 0)
continue;
@ -381,6 +384,18 @@ net_bind(short unsigned *port, int type, const char *log_service_name)
return -1;
}
int
net_bind(short unsigned *port, int type, const char *log_service_name)
{
return net_bind_impl(port, type, log_service_name, false);
}
int
net_bind_with_reuseport(short unsigned *port, int type, const char *log_service_name)
{
return net_bind_impl(port, type, log_service_name, true);
}
int
net_evhttp_bind(struct evhttp *evhttp, unsigned short port, const char *log_service_name)
{

3
src/misc.h
View File

@ -53,6 +53,9 @@ net_connect(const char *addr, unsigned short port, int type, const char *log_ser
int
net_bind(short unsigned *port, int type, const char *log_service_name);
int
net_bind_with_reuseport(short unsigned *port, int type, const char *log_service_name);
// To avoid polluting namespace too much we don't include event2/http.h here
struct evhttp;

437
src/worker.c
View File

@ -31,7 +31,6 @@
#include <errno.h>
#include <sys/queue.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <pthread.h>
@ -41,438 +40,14 @@
#include "db.h"
#include "logger.h"
#include "worker.h"
#include "evthr.h"
#include "misc.h"
#define THREADPOOL_NTHREADS 2
struct evthr_pool;
static struct evthr_pool *worker_threadpool;
/* ----------------- Thread handling borrowed from libevhtp ----------------- */
#ifndef TAILQ_FOREACH_SAFE
#define TAILQ_FOREACH_SAFE(var, head, field, tvar) \
for ((var) = TAILQ_FIRST((head)); \
(var) && ((tvar) = TAILQ_NEXT((var), field), 1); \
(var) = (tvar))
#endif
#define _evthr_read(thr, cmd, sock) \
(recv(sock, cmd, sizeof(struct evthr_cmd), 0) == sizeof(struct evthr_cmd)) ? 1 : 0
#define EVTHR_SHARED_PIPE 1
enum evthr_res {
EVTHR_RES_OK = 0,
EVTHR_RES_BACKLOG,
EVTHR_RES_RETRY,
EVTHR_RES_NOCB,
EVTHR_RES_FATAL
};
struct evthr;
typedef void (*evthr_cb)(struct evthr *thr, void *cmd_arg, void *shared);
typedef void (*evthr_init_cb)(struct evthr *thr, void *shared);
typedef void (*evthr_exit_cb)(struct evthr *thr, void *shared);
struct evthr_cmd {
uint8_t stop;
void *args;
evthr_cb cb;
} __attribute__((packed));
struct evthr_pool {
#ifdef EVTHR_SHARED_PIPE
int rdr;
int wdr;
#endif
int nthreads;
TAILQ_HEAD(evthr_pool_slist, evthr) threads;
};
struct evthr {
int rdr;
int wdr;
char err;
struct event *event;
struct event_base *evbase;
pthread_mutex_t lock;
pthread_t *thr;
evthr_init_cb init_cb;
evthr_exit_cb exit_cb;
void *arg;
void *aux;
#ifdef EVTHR_SHARED_PIPE
int pool_rdr;
struct event *shared_pool_ev;
#endif
TAILQ_ENTRY(evthr) next;
};
static void
_evthr_read_cmd(evutil_socket_t sock, short which, void *args)
{
struct evthr *thread;
struct evthr_cmd cmd;
int stopped;
if (!(thread = (struct evthr *)args)) {
return;
}
stopped = 0;
if (_evthr_read(thread, &cmd, sock) == 1) {
stopped = cmd.stop;
if (cmd.cb != NULL) {
(cmd.cb)(thread, cmd.args, thread->arg);
}
}
if (stopped == 1) {
event_base_loopbreak(thread->evbase);
}
return;
}
static void *
_evthr_loop(void *args)
{
struct evthr *thread;
if (!(thread = (struct evthr *)args)) {
return NULL;
}
if (thread == NULL || thread->thr == NULL) {
pthread_exit(NULL);
}
thread->evbase = event_base_new();
thread->event = event_new(thread->evbase, thread->rdr,
EV_READ | EV_PERSIST, _evthr_read_cmd, args);
event_add(thread->event, NULL);
#ifdef EVTHR_SHARED_PIPE
if (thread->pool_rdr > 0) {
thread->shared_pool_ev = event_new(thread->evbase, thread->pool_rdr,
EV_READ | EV_PERSIST, _evthr_read_cmd, args);
event_add(thread->shared_pool_ev, NULL);
}
#endif
pthread_mutex_lock(&thread->lock);
if (thread->init_cb != NULL) {
(thread->init_cb)(thread, thread->arg);
}
pthread_mutex_unlock(&thread->lock);
CHECK_ERR(L_MAIN, thread->err);
event_base_loop(thread->evbase, 0);
pthread_mutex_lock(&thread->lock);
if (thread->exit_cb != NULL) {
(thread->exit_cb)(thread, thread->arg);
}
pthread_mutex_unlock(&thread->lock);
pthread_exit(NULL);
}
static enum evthr_res
evthr_defer(struct evthr *thread, evthr_cb cb, void *arg)
{
struct evthr_cmd cmd = {
.cb = cb,
.args = arg,
.stop = 0
};
if (send(thread->wdr, &cmd, sizeof(cmd), 0) <= 0) {
return EVTHR_RES_RETRY;
}
return EVTHR_RES_OK;
}
static enum evthr_res
evthr_stop(struct evthr *thread)
{
struct evthr_cmd cmd = {
.cb = NULL,
.args = NULL,
.stop = 1
};
if (send(thread->wdr, &cmd, sizeof(struct evthr_cmd), 0) < 0) {
return EVTHR_RES_RETRY;
}
pthread_join(*thread->thr, NULL);
return EVTHR_RES_OK;
}
static struct event_base *
evthr_get_base(struct evthr * thr)
{
return thr ? thr->evbase : NULL;
}
static void
evthr_free(struct evthr *thread)
{
if (thread == NULL) {
return;
}
if (thread->rdr > 0) {
close(thread->rdr);
}
if (thread->wdr > 0) {
close(thread->wdr);
}
if (thread->thr) {
free(thread->thr);
}
if (thread->event) {
event_free(thread->event);
}
#ifdef EVTHR_SHARED_PIPE
if (thread->shared_pool_ev) {
event_free(thread->shared_pool_ev);
}
#endif
if (thread->evbase) {
event_base_free(thread->evbase);
}
free(thread);
}
static struct evthr *
evthr_wexit_new(evthr_init_cb init_cb, evthr_exit_cb exit_cb, void *args)
{
struct evthr *thread;
int fds[2];
if (evutil_socketpair(AF_UNIX, SOCK_STREAM, 0, fds) == -1) {
return NULL;
}
evutil_make_socket_nonblocking(fds[0]);
evutil_make_socket_nonblocking(fds[1]);
if (!(thread = calloc(1, sizeof(struct evthr)))) {
return NULL;
}
thread->thr = malloc(sizeof(pthread_t));
thread->arg = args;
thread->rdr = fds[0];
thread->wdr = fds[1];
thread->init_cb = init_cb;
thread->exit_cb = exit_cb;
if (pthread_mutex_init(&thread->lock, NULL)) {
evthr_free(thread);
return NULL;
}
return thread;
}
static int
evthr_start(struct evthr *thread)
{
if (thread == NULL || thread->thr == NULL) {
return -1;
}
if (pthread_create(thread->thr, NULL, _evthr_loop, (void *)thread)) {
return -1;
}
return 0;
}
static void
evthr_pool_free(struct evthr_pool *pool)
{
struct evthr *thread;
struct evthr *save;
if (pool == NULL) {
return;
}
TAILQ_FOREACH_SAFE(thread, &pool->threads, next, save) {
TAILQ_REMOVE(&pool->threads, thread, next);
evthr_free(thread);
}
free(pool);
}
static enum evthr_res
evthr_pool_stop(struct evthr_pool *pool)
{
struct evthr *thr;
struct evthr *save;
if (pool == NULL) {
return EVTHR_RES_FATAL;
}
TAILQ_FOREACH_SAFE(thr, &pool->threads, next, save) {
evthr_stop(thr);
}
return EVTHR_RES_OK;
}
static inline int
get_backlog_(struct evthr *thread)
{
int backlog = 0;
ioctl(thread->rdr, FIONREAD, &backlog);
return (int)(backlog / sizeof(struct evthr_cmd));
}
static enum evthr_res
evthr_pool_defer(struct evthr_pool *pool, evthr_cb cb, void *arg)
{
#ifdef EVTHR_SHARED_PIPE
struct evthr_cmd cmd = {
.cb = cb,
.args = arg,
.stop = 0
};
if (send(pool->wdr, &cmd, sizeof(cmd), 0) == -1) {
return EVTHR_RES_RETRY;
}
return EVTHR_RES_OK;
#endif
struct evthr *thread = NULL;
struct evthr *min_thread = NULL;
int min_backlog = 0;
if (pool == NULL) {
return EVTHR_RES_FATAL;
}
if (cb == NULL) {
return EVTHR_RES_NOCB;
}
TAILQ_FOREACH(thread, &pool->threads, next) {
int backlog = get_backlog_(thread);
if (backlog == 0) {
min_thread = thread;
break;
}
if (min_thread == NULL || backlog < min_backlog) {
min_thread = thread;
min_backlog = backlog;
}
}
return evthr_defer(min_thread, cb, arg);
}
static struct evthr_pool *
evthr_pool_wexit_new(int nthreads, evthr_init_cb init_cb, evthr_exit_cb exit_cb, void *shared)
{
struct evthr_pool *pool;
int i;
#ifdef EVTHR_SHARED_PIPE
int fds[2];
#endif
if (nthreads == 0) {
return NULL;
}
if (!(pool = calloc(1, sizeof(struct evthr_pool)))) {
return NULL;
}
pool->nthreads = nthreads;
TAILQ_INIT(&pool->threads);
#ifdef EVTHR_SHARED_PIPE
if (evutil_socketpair(AF_UNIX, SOCK_DGRAM, 0, fds) == -1) {
return NULL;
}
evutil_make_socket_nonblocking(fds[0]);
evutil_make_socket_nonblocking(fds[1]);
pool->rdr = fds[0];
pool->wdr = fds[1];
#endif
for (i = 0; i < nthreads; i++) {
struct evthr * thread;
if (!(thread = evthr_wexit_new(init_cb, exit_cb, shared))) {
evthr_pool_free(pool);
return NULL;
}
#ifdef EVTHR_SHARED_PIPE
thread->pool_rdr = fds[0];
#endif
TAILQ_INSERT_TAIL(&pool->threads, thread, next);
}
return pool;
}
static int
evthr_pool_start(struct evthr_pool *pool)
{
struct evthr *evthr = NULL;
if (pool == NULL) {
return -1;
}
TAILQ_FOREACH(evthr, &pool->threads, next) {
if (evthr_start(evthr) < 0) {
return -1;
}
usleep(5000);
}
return 0;
}
/* ----------------------------- CALLBACK EXECUTION ------------------------- */
/* Worker threads */
@ -521,15 +96,7 @@ execute(struct evthr *thr, void *arg, void *shared)
static void
init_cb(struct evthr *thr, void *shared)
{
int ret;
ret = db_perthread_init();
if (ret < 0)
{
DPRINTF(E_FATAL, L_MAIN, "Error: DB init failed (worker thread)\n");
thr->err = EIO;
return;
}
CHECK_ERR(L_MAIN, db_perthread_init());
thread_setname(pthread_self(), "worker");
}