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/*
* Copyright (c) 2010-2011, Pieter Noordhuis <pcnoordhuis at gmail dot com>
*
* 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 Redis 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 OWNER 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.
*/
#ifndef __HIREDIS_LIBEVENT_H__
#define __HIREDIS_LIBEVENT_H__
#include <event2/event.h>
#include "../hiredis.h"
#include "../async.h"
#define REDIS_LIBEVENT_DELETED 0x01
#define REDIS_LIBEVENT_ENTERED 0x02
typedef struct redisLibeventEvents {
redisAsyncContext *context;
struct event *ev;
struct event_base *base;
struct timeval tv;
short flags;
short state;
} redisLibeventEvents;
static void redisLibeventDestroy(redisLibeventEvents *e) {
hi_free(e);
}
static void redisLibeventHandler(evutil_socket_t fd, short event, void *arg) {
((void)fd);
redisLibeventEvents *e = (redisLibeventEvents*)arg;
e->state |= REDIS_LIBEVENT_ENTERED;
#define CHECK_DELETED() if (e->state & REDIS_LIBEVENT_DELETED) {\
redisLibeventDestroy(e);\
return; \
}
if ((event & EV_TIMEOUT) && (e->state & REDIS_LIBEVENT_DELETED) == 0) {
redisAsyncHandleTimeout(e->context);
CHECK_DELETED();
}
if ((event & EV_READ) && e->context && (e->state & REDIS_LIBEVENT_DELETED) == 0) {
redisAsyncHandleRead(e->context);
CHECK_DELETED();
}
if ((event & EV_WRITE) && e->context && (e->state & REDIS_LIBEVENT_DELETED) == 0) {
redisAsyncHandleWrite(e->context);
CHECK_DELETED();
}
e->state &= ~REDIS_LIBEVENT_ENTERED;
#undef CHECK_DELETED
}
static void redisLibeventUpdate(void *privdata, short flag, int isRemove) {
redisLibeventEvents *e = (redisLibeventEvents *)privdata;
const struct timeval *tv = e->tv.tv_sec || e->tv.tv_usec ? &e->tv : NULL;
if (isRemove) {
if ((e->flags & flag) == 0) {
return;
} else {
e->flags &= ~flag;
}
} else {
if (e->flags & flag) {
return;
} else {
e->flags |= flag;
}
}
event_del(e->ev);
event_assign(e->ev, e->base, e->context->c.fd, e->flags | EV_PERSIST,
redisLibeventHandler, privdata);
event_add(e->ev, tv);
}
static void redisLibeventAddRead(void *privdata) {
redisLibeventUpdate(privdata, EV_READ, 0);
}
static void redisLibeventDelRead(void *privdata) {
redisLibeventUpdate(privdata, EV_READ, 1);
}
static void redisLibeventAddWrite(void *privdata) {
redisLibeventUpdate(privdata, EV_WRITE, 0);
}
static void redisLibeventDelWrite(void *privdata) {
redisLibeventUpdate(privdata, EV_WRITE, 1);
}
static void redisLibeventCleanup(void *privdata) {
redisLibeventEvents *e = (redisLibeventEvents*)privdata;
if (!e) {
return;
}
event_del(e->ev);
event_free(e->ev);
e->ev = NULL;
if (e->state & REDIS_LIBEVENT_ENTERED) {
e->state |= REDIS_LIBEVENT_DELETED;
} else {
redisLibeventDestroy(e);
}
}
static void redisLibeventSetTimeout(void *privdata, struct timeval tv) {
redisLibeventEvents *e = (redisLibeventEvents *)privdata;
short flags = e->flags;
e->flags = 0;
e->tv = tv;
redisLibeventUpdate(e, flags, 0);
}
static int redisLibeventAttach(redisAsyncContext *ac, struct event_base *base) {
redisContext *c = &(ac->c);
redisLibeventEvents *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 = (redisLibeventEvents*)hi_calloc(1, sizeof(*e));
if (e == NULL)
return REDIS_ERR;
e->context = ac;
/* Register functions to start/stop listening for events */
ac->ev.addRead = redisLibeventAddRead;
ac->ev.delRead = redisLibeventDelRead;
ac->ev.addWrite = redisLibeventAddWrite;
ac->ev.delWrite = redisLibeventDelWrite;
ac->ev.cleanup = redisLibeventCleanup;
ac->ev.scheduleTimer = redisLibeventSetTimeout;
ac->ev.data = e;
/* Initialize and install read/write events */
e->ev = event_new(base, c->fd, EV_READ | EV_WRITE, redisLibeventHandler, e);
e->base = base;
return REDIS_OK;
}
#endif
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