deps/hiredis/adapters/libevent.h

   1 /*
   2  * Copyright (c) 2010-2011, Pieter Noordhuis <pcnoordhuis at gmail dot com>
   3  *
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  *   * Redistributions of source code must retain the above copyright notice,
  10  *     this list of conditions and the following disclaimer.
  11  *   * Redistributions in binary form must reproduce the above copyright
  12  *     notice, this list of conditions and the following disclaimer in the
  13  *     documentation and/or other materials provided with the distribution.
  14  *   * Neither the name of Redis nor the names of its contributors may be used
  15  *     to endorse or promote products derived from this software without
  16  *     specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28  * POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #ifndef __HIREDIS_LIBEVENT_H__
  32 #define __HIREDIS_LIBEVENT_H__
  33 #include <event.h>
  34 #include "../hiredis.h"
  35 #include "../async.h"
  36
  37 typedef struct redisLibeventEvents {
  38     redisAsyncContext *context;
  39     struct event rev, wev;
  40 } redisLibeventEvents;
  41
  42 static void redisLibeventReadEvent(int fd, short event, void *arg) {
  43     ((void)fd); ((void)event);
  44     redisLibeventEvents *e = (redisLibeventEvents*)arg;
  45     redisAsyncHandleRead(e->context);
  46 }
  47
  48 static void redisLibeventWriteEvent(int fd, short event, void *arg) {
  49     ((void)fd); ((void)event);
  50     redisLibeventEvents *e = (redisLibeventEvents*)arg;
  51     redisAsyncHandleWrite(e->context);
  52 }
  53
  54 static void redisLibeventAddRead(void *privdata) {
  55     redisLibeventEvents *e = (redisLibeventEvents*)privdata;
  56     event_add(&e->rev,NULL);
  57 }
  58
  59 static void redisLibeventDelRead(void *privdata) {
  60     redisLibeventEvents *e = (redisLibeventEvents*)privdata;
  61     event_del(&e->rev);
  62 }
  63
  64 static void redisLibeventAddWrite(void *privdata) {
  65     redisLibeventEvents *e = (redisLibeventEvents*)privdata;
  66     event_add(&e->wev,NULL);
  67 }
  68
  69 static void redisLibeventDelWrite(void *privdata) {
  70     redisLibeventEvents *e = (redisLibeventEvents*)privdata;
  71     event_del(&e->wev);
  72 }
  73
  74 static void redisLibeventCleanup(void *privdata) {
  75     redisLibeventEvents *e = (redisLibeventEvents*)privdata;
  76     event_del(&e->rev);
  77     event_del(&e->wev);
  78     free(e);
  79 }
  80
  81 static int redisLibeventAttach(redisAsyncContext *ac, struct event_base *base) {
  82     redisContext *c = &(ac->c);
  83     redisLibeventEvents *e;
  84
  85     /* Nothing should be attached when something is already attached */
  86     if (ac->ev.data != NULL)
  87         return REDIS_ERR;
  88
  89     /* Create container for context and r/w events */
  90     e = (redisLibeventEvents*)malloc(sizeof(*e));
  91     e->context = ac;
  92
  93     /* Register functions to start/stop listening for events */
  94     ac->ev.addRead = redisLibeventAddRead;
  95     ac->ev.delRead = redisLibeventDelRead;
  96     ac->ev.addWrite = redisLibeventAddWrite;
  97     ac->ev.delWrite = redisLibeventDelWrite;
  98     ac->ev.cleanup = redisLibeventCleanup;
  99     ac->ev.data = e;
 100
 101     /* Initialize and install read/write events */
 102     event_set(&e->rev,c->fd,EV_READ,redisLibeventReadEvent,e);
 103     event_set(&e->wev,c->fd,EV_WRITE,redisLibeventWriteEvent,e);
 104     event_base_set(base,&e->rev);
 105     event_base_set(base,&e->wev);
 106     return REDIS_OK;
 107 }
 108 #endif