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#ifndef HIREDIS_LIBSDEVENT_H
#define HIREDIS_LIBSDEVENT_H
#include <systemd/sd-event.h>
#include "../hiredis.h"
#include "../async.h"
#define REDIS_LIBSDEVENT_DELETED 0x01
#define REDIS_LIBSDEVENT_ENTERED 0x02
typedef struct redisLibsdeventEvents {
redisAsyncContext *context;
struct sd_event *event;
struct sd_event_source *fdSource;
struct sd_event_source *timerSource;
int fd;
short flags;
short state;
} redisLibsdeventEvents;
static void redisLibsdeventDestroy(redisLibsdeventEvents *e) {
if (e->fdSource) {
e->fdSource = sd_event_source_disable_unref(e->fdSource);
}
if (e->timerSource) {
e->timerSource = sd_event_source_disable_unref(e->timerSource);
}
sd_event_unref(e->event);
hi_free(e);
}
static int redisLibsdeventTimeoutHandler(sd_event_source *s, uint64_t usec, void *userdata) {
((void)s);
((void)usec);
redisLibsdeventEvents *e = (redisLibsdeventEvents*)userdata;
redisAsyncHandleTimeout(e->context);
return 0;
}
static int redisLibsdeventHandler(sd_event_source *s, int fd, uint32_t event, void *userdata) {
((void)s);
((void)fd);
redisLibsdeventEvents *e = (redisLibsdeventEvents*)userdata;
e->state |= REDIS_LIBSDEVENT_ENTERED;
#define CHECK_DELETED() if (e->state & REDIS_LIBSDEVENT_DELETED) {\
redisLibsdeventDestroy(e);\
return 0; \
}
if ((event & EPOLLIN) && e->context && (e->state & REDIS_LIBSDEVENT_DELETED) == 0) {
redisAsyncHandleRead(e->context);
CHECK_DELETED();
}
if ((event & EPOLLOUT) && e->context && (e->state & REDIS_LIBSDEVENT_DELETED) == 0) {
redisAsyncHandleWrite(e->context);
CHECK_DELETED();
}
e->state &= ~REDIS_LIBSDEVENT_ENTERED;
#undef CHECK_DELETED
return 0;
}
static void redisLibsdeventAddRead(void *userdata) {
redisLibsdeventEvents *e = (redisLibsdeventEvents*)userdata;
if (e->flags & EPOLLIN) {
return;
}
e->flags |= EPOLLIN;
if (e->flags & EPOLLOUT) {
sd_event_source_set_io_events(e->fdSource, e->flags);
} else {
sd_event_add_io(e->event, &e->fdSource, e->fd, e->flags, redisLibsdeventHandler, e);
}
}
static void redisLibsdeventDelRead(void *userdata) {
redisLibsdeventEvents *e = (redisLibsdeventEvents*)userdata;
e->flags &= ~EPOLLIN;
if (e->flags) {
sd_event_source_set_io_events(e->fdSource, e->flags);
} else {
e->fdSource = sd_event_source_disable_unref(e->fdSource);
}
}
static void redisLibsdeventAddWrite(void *userdata) {
redisLibsdeventEvents *e = (redisLibsdeventEvents*)userdata;
if (e->flags & EPOLLOUT) {
return;
}
e->flags |= EPOLLOUT;
if (e->flags & EPOLLIN) {
sd_event_source_set_io_events(e->fdSource, e->flags);
} else {
sd_event_add_io(e->event, &e->fdSource, e->fd, e->flags, redisLibsdeventHandler, e);
}
}
static void redisLibsdeventDelWrite(void *userdata) {
redisLibsdeventEvents *e = (redisLibsdeventEvents*)userdata;
e->flags &= ~EPOLLOUT;
if (e->flags) {
sd_event_source_set_io_events(e->fdSource, e->flags);
} else {
e->fdSource = sd_event_source_disable_unref(e->fdSource);
}
}
static void redisLibsdeventCleanup(void *userdata) {
redisLibsdeventEvents *e = (redisLibsdeventEvents*)userdata;
if (!e) {
return;
}
if (e->state & REDIS_LIBSDEVENT_ENTERED) {
e->state |= REDIS_LIBSDEVENT_DELETED;
} else {
redisLibsdeventDestroy(e);
}
}
static void redisLibsdeventSetTimeout(void *userdata, struct timeval tv) {
redisLibsdeventEvents *e = (redisLibsdeventEvents *)userdata;
uint64_t usec = tv.tv_sec * 1000000 + tv.tv_usec;
if (!e->timerSource) {
sd_event_add_time_relative(e->event, &e->timerSource, CLOCK_MONOTONIC, usec, 1, redisLibsdeventTimeoutHandler, e);
} else {
sd_event_source_set_time_relative(e->timerSource, usec);
}
}
static int redisLibsdeventAttach(redisAsyncContext *ac, struct sd_event *event) {
redisContext *c = &(ac->c);
redisLibsdeventEvents *e;
/* Nothing should be attached when something is already attached */
if (ac->ev.data != NULL)
return REDIS_ERR;
/* Create container for context and r/w events */
e = (redisLibsdeventEvents*)hi_calloc(1, sizeof(*e));
if (e == NULL)
return REDIS_ERR;
/* Initialize and increase event refcount */
e->context = ac;
e->event = event;
e->fd = c->fd;
sd_event_ref(event);
/* Register functions to start/stop listening for events */
ac->ev.addRead = redisLibsdeventAddRead;
ac->ev.delRead = redisLibsdeventDelRead;
ac->ev.addWrite = redisLibsdeventAddWrite;
ac->ev.delWrite = redisLibsdeventDelWrite;
ac->ev.cleanup = redisLibsdeventCleanup;
ac->ev.scheduleTimer = redisLibsdeventSetTimeout;
ac->ev.data = e;
return REDIS_OK;
}
#endif
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