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/*
* Copyright (c) 2013, Salvatore Sanfilippo <antirez 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.
*/
#include "redis.h"
/* This file implements keyspace events notification via Pub/Sub ad
* described at http://redis.io/topics/keyspace-events.
*
* The API provided to the rest of the Redis core is a simple function:
*
* notifyKeyspaceEvent(char *event, robj *key, int dbid);
*
* 'event' is a C string representing the event name.
* 'key' is a Redis object representing the key name.
* 'dbid' is the database ID where the key lives.
*/
void notifyKeyspaceEvent(char *event, robj *key, int dbid) {
sds keyspace_chan, keyevent_chan;
int len;
char buf[24];
robj *chan1, *chan2, *eventobj;
if (!server.notify_keyspace_events) return;
/* The prefix of the two channels is identical if not for
* 'keyspace' that is 'keyevent' in the event channel name, so
* we build a single prefix and overwrite 'event' with 'space'. */
keyspace_chan = sdsnewlen("__keyspace@",11);
len = ll2string(buf,sizeof(buf),dbid);
keyspace_chan = sdscatlen(keyspace_chan, buf, len);
keyspace_chan = sdscatlen(keyspace_chan, "__:", 3);
keyevent_chan = sdsdup(keyspace_chan); /* Dup the prefix. */
memcpy(keyevent_chan+5,"event",5); /* Fix it. */
eventobj = createStringObject(event,strlen(event));
/* The keyspace channel name has a trailing key name, while
* the keyevent channel name has a trailing event name. */
keyspace_chan = sdscatsds(keyspace_chan, key->ptr);
keyevent_chan = sdscatsds(keyevent_chan, eventobj->ptr);
chan1 = createObject(REDIS_STRING, keyspace_chan);
chan2 = createObject(REDIS_STRING, keyevent_chan);
/* Finally publish the two notifications. */
pubsubPublishMessage(chan1, eventobj);
pubsubPublishMessage(chan2, key);
/* Release objects. */
decrRefCount(eventobj);
decrRefCount(chan1);
decrRefCount(chan2);
}
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