redis/deps/hiredis/adapters/libevent.h

/*
 * 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"

typedef struct redisLibeventEvents {
    redisAsyncContext *context;
    struct event *rev, *wev;
} redisLibeventEvents;

static void redisLibeventReadEvent(int fd, short event, void *arg) {
    ((void)fd); ((void)event);
    redisLibeventEvents *e = (redisLibeventEvents*)arg;
    redisAsyncHandleRead(e->context);
}

static void redisLibeventWriteEvent(int fd, short event, void *arg) {
    ((void)fd); ((void)event);
    redisLibeventEvents *e = (redisLibeventEvents*)arg;
    redisAsyncHandleWrite(e->context);
}

static void redisLibeventAddRead(void *privdata) {
    redisLibeventEvents *e = (redisLibeventEvents*)privdata;
    event_add(e->rev,NULL);
}

static void redisLibeventDelRead(void *privdata) {
    redisLibeventEvents *e = (redisLibeventEvents*)privdata;
    event_del(e->rev);
}

static void redisLibeventAddWrite(void *privdata) {
    redisLibeventEvents *e = (redisLibeventEvents*)privdata;
    event_add(e->wev,NULL);
}

static void redisLibeventDelWrite(void *privdata) {
    redisLibeventEvents *e = (redisLibeventEvents*)privdata;
    event_del(e->wev);
}

static void redisLibeventCleanup(void *privdata) {
    redisLibeventEvents *e = (redisLibeventEvents*)privdata;
    event_del(e->rev);
    event_del(e->wev);
    free(e);
}

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*)malloc(sizeof(*e));
    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.data = e;

    /* Initialize and install read/write events */
    e->rev = event_new(base, c->fd, EV_READ, redisLibeventReadEvent, e);
    e->wev = event_new(base, c->fd, EV_WRITE, redisLibeventWriteEvent, e);
    event_add(e->rev, NULL);
    event_add(e->wev, NULL);
    return REDIS_OK;
}
#endif