[redis.git] / src / pubsub.c

#include "redis.h"

/*-----------------------------------------------------------------------------
 * Pubsub low level API
 *----------------------------------------------------------------------------*/

void freePubsubPattern(void *p) {
    pubsubPattern *pat = p;

    decrRefCount(pat->pattern);
    zfree(pat);
}

int listMatchPubsubPattern(void *a, void *b) {
    pubsubPattern *pa = a, *pb = b;

    return (pa->client == pb->client) &&
           (equalStringObjects(pa->pattern,pb->pattern));
}

/* Subscribe a client to a channel. Returns 1 if the operation succeeded, or
 * 0 if the client was already subscribed to that channel. */
int pubsubSubscribeChannel(redisClient *c, robj *channel) {
    struct dictEntry *de;
    list *clients = NULL;
    int retval = 0;

    /* Add the channel to the client -> channels hash table */
    if (dictAdd(c->pubsub_channels,channel,NULL) == DICT_OK) {
        retval = 1;
        incrRefCount(channel);
        /* Add the client to the channel -> list of clients hash table */
        de = dictFind(server.pubsub_channels,channel);
        if (de == NULL) {
            clients = listCreate();
            dictAdd(server.pubsub_channels,channel,clients);
            incrRefCount(channel);
        } else {
            clients = dictGetVal(de);
        }
        listAddNodeTail(clients,c);
    }
    /* Notify the client */
    addReply(c,shared.mbulkhdr[3]);
    addReply(c,shared.subscribebulk);
    addReplyBulk(c,channel);
    addReplyLongLong(c,dictSize(c->pubsub_channels)+listLength(c->pubsub_patterns));
    return retval;
}

/* Unsubscribe a client from a channel. Returns 1 if the operation succeeded, or
 * 0 if the client was not subscribed to the specified channel. */
int pubsubUnsubscribeChannel(redisClient *c, robj *channel, int notify) {
    struct dictEntry *de;
    list *clients;
    listNode *ln;
    int retval = 0;

    /* Remove the channel from the client -> channels hash table */
    incrRefCount(channel); /* channel may be just a pointer to the same object
                            we have in the hash tables. Protect it... */
    if (dictDelete(c->pubsub_channels,channel) == DICT_OK) {
        retval = 1;
        /* Remove the client from the channel -> clients list hash table */
        de = dictFind(server.pubsub_channels,channel);
        redisAssertWithInfo(c,NULL,de != NULL);
        clients = dictGetVal(de);
        ln = listSearchKey(clients,c);
        redisAssertWithInfo(c,NULL,ln != NULL);
        listDelNode(clients,ln);
        if (listLength(clients) == 0) {
            /* Free the list and associated hash entry at all if this was
             * the latest client, so that it will be possible to abuse
             * Redis PUBSUB creating millions of channels. */
            dictDelete(server.pubsub_channels,channel);
        }
    }
    /* Notify the client */
    if (notify) {
        addReply(c,shared.mbulkhdr[3]);
        addReply(c,shared.unsubscribebulk);
        addReplyBulk(c,channel);
        addReplyLongLong(c,dictSize(c->pubsub_channels)+
                       listLength(c->pubsub_patterns));

    }
    decrRefCount(channel); /* it is finally safe to release it */
    return retval;
}

/* Subscribe a client to a pattern. Returns 1 if the operation succeeded, or 0 if the clinet was already subscribed to that pattern. */
int pubsubSubscribePattern(redisClient *c, robj *pattern) {
    int retval = 0;

    if (listSearchKey(c->pubsub_patterns,pattern) == NULL) {
        retval = 1;
        pubsubPattern *pat;
        listAddNodeTail(c->pubsub_patterns,pattern);
        incrRefCount(pattern);
        pat = zmalloc(sizeof(*pat));
        pat->pattern = getDecodedObject(pattern);
        pat->client = c;
        listAddNodeTail(server.pubsub_patterns,pat);
    }
    /* Notify the client */
    addReply(c,shared.mbulkhdr[3]);
    addReply(c,shared.psubscribebulk);
    addReplyBulk(c,pattern);
    addReplyLongLong(c,dictSize(c->pubsub_channels)+listLength(c->pubsub_patterns));
    return retval;
}

/* Unsubscribe a client from a channel. Returns 1 if the operation succeeded, or
 * 0 if the client was not subscribed to the specified channel. */
int pubsubUnsubscribePattern(redisClient *c, robj *pattern, int notify) {
    listNode *ln;
    pubsubPattern pat;
    int retval = 0;

    incrRefCount(pattern); /* Protect the object. May be the same we remove */
    if ((ln = listSearchKey(c->pubsub_patterns,pattern)) != NULL) {
        retval = 1;
        listDelNode(c->pubsub_patterns,ln);
        pat.client = c;
        pat.pattern = pattern;
        ln = listSearchKey(server.pubsub_patterns,&pat);
        listDelNode(server.pubsub_patterns,ln);
    }
    /* Notify the client */
    if (notify) {
        addReply(c,shared.mbulkhdr[3]);
        addReply(c,shared.punsubscribebulk);
        addReplyBulk(c,pattern);
        addReplyLongLong(c,dictSize(c->pubsub_channels)+
                       listLength(c->pubsub_patterns));
    }
    decrRefCount(pattern);
    return retval;
}

/* Unsubscribe from all the channels. Return the number of channels the
 * client was subscribed from. */
int pubsubUnsubscribeAllChannels(redisClient *c, int notify) {
    dictIterator *di = dictGetSafeIterator(c->pubsub_channels);
    dictEntry *de;
    int count = 0;

    while((de = dictNext(di)) != NULL) {
        robj *channel = dictGetKey(de);

        count += pubsubUnsubscribeChannel(c,channel,notify);
    }
    dictReleaseIterator(di);
    return count;
}

/* Unsubscribe from all the patterns. Return the number of patterns the
 * client was subscribed from. */
int pubsubUnsubscribeAllPatterns(redisClient *c, int notify) {
    listNode *ln;
    listIter li;
    int count = 0;

    listRewind(c->pubsub_patterns,&li);
    while ((ln = listNext(&li)) != NULL) {
        robj *pattern = ln->value;

        count += pubsubUnsubscribePattern(c,pattern,notify);
    }
    return count;
}

/* Publish a message */
int pubsubPublishMessage(robj *channel, robj *message) {
    int receivers = 0;
    struct dictEntry *de;
    listNode *ln;
    listIter li;

    /* Send to clients listening for that channel */
    de = dictFind(server.pubsub_channels,channel);
    if (de) {
        list *list = dictGetVal(de);
        listNode *ln;
        listIter li;

        listRewind(list,&li);
        while ((ln = listNext(&li)) != NULL) {
            redisClient *c = ln->value;

            addReply(c,shared.mbulkhdr[3]);
            addReply(c,shared.messagebulk);
            addReplyBulk(c,channel);
            addReplyBulk(c,message);
            receivers++;
        }
    }
    /* Send to clients listening to matching channels */
    if (listLength(server.pubsub_patterns)) {
        listRewind(server.pubsub_patterns,&li);
        channel = getDecodedObject(channel);
        while ((ln = listNext(&li)) != NULL) {
            pubsubPattern *pat = ln->value;

            if (stringmatchlen((char*)pat->pattern->ptr,
                                sdslen(pat->pattern->ptr),
                                (char*)channel->ptr,
                                sdslen(channel->ptr),0)) {
                addReply(pat->client,shared.mbulkhdr[4]);
                addReply(pat->client,shared.pmessagebulk);
                addReplyBulk(pat->client,pat->pattern);
                addReplyBulk(pat->client,channel);
                addReplyBulk(pat->client,message);
                receivers++;
            }
        }
        decrRefCount(channel);
    }
    return receivers;
}

/*-----------------------------------------------------------------------------
 * Pubsub commands implementation
 *----------------------------------------------------------------------------*/

void subscribeCommand(redisClient *c) {
    int j;

    for (j = 1; j < c->argc; j++)
        pubsubSubscribeChannel(c,c->argv[j]);
}

void unsubscribeCommand(redisClient *c) {
    if (c->argc == 1) {
        pubsubUnsubscribeAllChannels(c,1);
        return;
    } else {
        int j;

        for (j = 1; j < c->argc; j++)
            pubsubUnsubscribeChannel(c,c->argv[j],1);
    }
}

void psubscribeCommand(redisClient *c) {
    int j;

    for (j = 1; j < c->argc; j++)
        pubsubSubscribePattern(c,c->argv[j]);
}

void punsubscribeCommand(redisClient *c) {
    if (c->argc == 1) {
        pubsubUnsubscribeAllPatterns(c,1);
        return;
    } else {
        int j;

        for (j = 1; j < c->argc; j++)
            pubsubUnsubscribePattern(c,c->argv[j],1);
    }
}

void publishCommand(redisClient *c) {
    int receivers = pubsubPublishMessage(c->argv[1],c->argv[2]);
    addReplyLongLong(c,receivers);
}
Commit	Line	Data
e2641e09	1	#include "redis.h"
e2641e09	2
0f49d6b0	3	/*-----------------------------------------------------------------------------
	4	* Pubsub low level API
	5	----------------------------------------------------------------------------/
	6
e2641e09	7	void freePubsubPattern(void *p) {
	8	pubsubPattern *pat = p;
	9
	10	decrRefCount(pat->pattern);
	11	zfree(pat);
	12	}
	13
	14	int listMatchPubsubPattern(void a, void b) {
	15	pubsubPattern pa = a, pb = b;
	16
	17	return (pa->client == pb->client) &&
	18	(equalStringObjects(pa->pattern,pb->pattern));
	19	}
	20
	21	/* Subscribe a client to a channel. Returns 1 if the operation succeeded, or
	22	* 0 if the client was already subscribed to that channel. */
	23	int pubsubSubscribeChannel(redisClient c, robj channel) {
	24	struct dictEntry *de;
	25	list *clients = NULL;
	26	int retval = 0;
	27
	28	/* Add the channel to the client -> channels hash table */
	29	if (dictAdd(c->pubsub_channels,channel,NULL) == DICT_OK) {
	30	retval = 1;
	31	incrRefCount(channel);
	32	/* Add the client to the channel -> list of clients hash table */
	33	de = dictFind(server.pubsub_channels,channel);
	34	if (de == NULL) {
	35	clients = listCreate();
	36	dictAdd(server.pubsub_channels,channel,clients);
	37	incrRefCount(channel);
	38	} else {
c0ba9ebe	39	clients = dictGetVal(de);
e2641e09	40	}
	41	listAddNodeTail(clients,c);
	42	}
	43	/* Notify the client */
355f8591	44	addReply(c,shared.mbulkhdr[3]);
e2641e09	45	addReply(c,shared.subscribebulk);
	46	addReplyBulk(c,channel);
	47	addReplyLongLong(c,dictSize(c->pubsub_channels)+listLength(c->pubsub_patterns));
	48	return retval;
	49	}
	50
	51	/* Unsubscribe a client from a channel. Returns 1 if the operation succeeded, or
	52	* 0 if the client was not subscribed to the specified channel. */
	53	int pubsubUnsubscribeChannel(redisClient c, robj channel, int notify) {
	54	struct dictEntry *de;
	55	list *clients;
	56	listNode *ln;
	57	int retval = 0;
	58
	59	/* Remove the channel from the client -> channels hash table */
	60	incrRefCount(channel); /* channel may be just a pointer to the same object
	61	we have in the hash tables. Protect it... */
	62	if (dictDelete(c->pubsub_channels,channel) == DICT_OK) {
	63	retval = 1;
	64	/* Remove the client from the channel -> clients list hash table */
	65	de = dictFind(server.pubsub_channels,channel);
eab0e26e	66	redisAssertWithInfo(c,NULL,de != NULL);
c0ba9ebe	67	clients = dictGetVal(de);
e2641e09	68	ln = listSearchKey(clients,c);
eab0e26e	69	redisAssertWithInfo(c,NULL,ln != NULL);
e2641e09	70	listDelNode(clients,ln);
	71	if (listLength(clients) == 0) {
	72	/* Free the list and associated hash entry at all if this was
	73	* the latest client, so that it will be possible to abuse
	74	* Redis PUBSUB creating millions of channels. */
	75	dictDelete(server.pubsub_channels,channel);
	76	}
	77	}
	78	/* Notify the client */
	79	if (notify) {
355f8591	80	addReply(c,shared.mbulkhdr[3]);
e2641e09	81	addReply(c,shared.unsubscribebulk);
	82	addReplyBulk(c,channel);
	83	addReplyLongLong(c,dictSize(c->pubsub_channels)+
	84	listLength(c->pubsub_patterns));
	85
	86	}
	87	decrRefCount(channel); /* it is finally safe to release it */
	88	return retval;
	89	}
	90
	91	/* Subscribe a client to a pattern. Returns 1 if the operation succeeded, or 0 if the clinet was already subscribed to that pattern. */
	92	int pubsubSubscribePattern(redisClient c, robj pattern) {
	93	int retval = 0;
	94
	95	if (listSearchKey(c->pubsub_patterns,pattern) == NULL) {
	96	retval = 1;
	97	pubsubPattern *pat;
	98	listAddNodeTail(c->pubsub_patterns,pattern);
	99	incrRefCount(pattern);
	100	pat = zmalloc(sizeof(*pat));
	101	pat->pattern = getDecodedObject(pattern);
	102	pat->client = c;
	103	listAddNodeTail(server.pubsub_patterns,pat);
	104	}
	105	/* Notify the client */
355f8591	106	addReply(c,shared.mbulkhdr[3]);
e2641e09	107	addReply(c,shared.psubscribebulk);
	108	addReplyBulk(c,pattern);
	109	addReplyLongLong(c,dictSize(c->pubsub_channels)+listLength(c->pubsub_patterns));
	110	return retval;
	111	}
	112
	113	/* Unsubscribe a client from a channel. Returns 1 if the operation succeeded, or
	114	* 0 if the client was not subscribed to the specified channel. */
	115	int pubsubUnsubscribePattern(redisClient c, robj pattern, int notify) {
	116	listNode *ln;
	117	pubsubPattern pat;
	118	int retval = 0;
	119
	120	incrRefCount(pattern); /* Protect the object. May be the same we remove */
	121	if ((ln = listSearchKey(c->pubsub_patterns,pattern)) != NULL) {
	122	retval = 1;
	123	listDelNode(c->pubsub_patterns,ln);
	124	pat.client = c;
	125	pat.pattern = pattern;
	126	ln = listSearchKey(server.pubsub_patterns,&pat);
	127	listDelNode(server.pubsub_patterns,ln);
	128	}
	129	/* Notify the client */
	130	if (notify) {
355f8591	131	addReply(c,shared.mbulkhdr[3]);
e2641e09	132	addReply(c,shared.punsubscribebulk);
	133	addReplyBulk(c,pattern);
	134	addReplyLongLong(c,dictSize(c->pubsub_channels)+
	135	listLength(c->pubsub_patterns));
	136	}
	137	decrRefCount(pattern);
	138	return retval;
	139	}
	140
	141	/* Unsubscribe from all the channels. Return the number of channels the
	142	* client was subscribed from. */
	143	int pubsubUnsubscribeAllChannels(redisClient *c, int notify) {
efc34087	144	dictIterator *di = dictGetSafeIterator(c->pubsub_channels);
e2641e09	145	dictEntry *de;
	146	int count = 0;
	147
	148	while((de = dictNext(di)) != NULL) {
c0ba9ebe	149	robj *channel = dictGetKey(de);
e2641e09	150
	151	count += pubsubUnsubscribeChannel(c,channel,notify);
	152	}
	153	dictReleaseIterator(di);
	154	return count;
	155	}
	156
	157	/* Unsubscribe from all the patterns. Return the number of patterns the
	158	* client was subscribed from. */
	159	int pubsubUnsubscribeAllPatterns(redisClient *c, int notify) {
	160	listNode *ln;
	161	listIter li;
	162	int count = 0;
	163
	164	listRewind(c->pubsub_patterns,&li);
	165	while ((ln = listNext(&li)) != NULL) {
	166	robj *pattern = ln->value;
	167
	168	count += pubsubUnsubscribePattern(c,pattern,notify);
	169	}
	170	return count;
	171	}
	172
	173	/* Publish a message */
	174	int pubsubPublishMessage(robj channel, robj message) {
	175	int receivers = 0;
	176	struct dictEntry *de;
	177	listNode *ln;
	178	listIter li;
	179
	180	/* Send to clients listening for that channel */
	181	de = dictFind(server.pubsub_channels,channel);
	182	if (de) {
c0ba9ebe	183	list *list = dictGetVal(de);
e2641e09	184	listNode *ln;
	185	listIter li;
	186
	187	listRewind(list,&li);
	188	while ((ln = listNext(&li)) != NULL) {
	189	redisClient *c = ln->value;
	190
355f8591	191	addReply(c,shared.mbulkhdr[3]);
e2641e09	192	addReply(c,shared.messagebulk);
	193	addReplyBulk(c,channel);
	194	addReplyBulk(c,message);
	195	receivers++;
	196	}
	197	}
	198	/* Send to clients listening to matching channels */
	199	if (listLength(server.pubsub_patterns)) {
	200	listRewind(server.pubsub_patterns,&li);
	201	channel = getDecodedObject(channel);
	202	while ((ln = listNext(&li)) != NULL) {
	203	pubsubPattern *pat = ln->value;
	204
	205	if (stringmatchlen((char*)pat->pattern->ptr,
	206	sdslen(pat->pattern->ptr),
	207	(char*)channel->ptr,
	208	sdslen(channel->ptr),0)) {
355f8591	209	addReply(pat->client,shared.mbulkhdr[4]);
e2641e09	210	addReply(pat->client,shared.pmessagebulk);
	211	addReplyBulk(pat->client,pat->pattern);
	212	addReplyBulk(pat->client,channel);
	213	addReplyBulk(pat->client,message);
	214	receivers++;
	215	}
	216	}
	217	decrRefCount(channel);
	218	}
	219	return receivers;
	220	}
	221
0f49d6b0	222	/*-----------------------------------------------------------------------------
	223	* Pubsub commands implementation
	224	----------------------------------------------------------------------------/
	225
e2641e09	226	void subscribeCommand(redisClient *c) {
	227	int j;
	228
	229	for (j = 1; j < c->argc; j++)
	230	pubsubSubscribeChannel(c,c->argv[j]);
	231	}
	232
	233	void unsubscribeCommand(redisClient *c) {
	234	if (c->argc == 1) {
	235	pubsubUnsubscribeAllChannels(c,1);
	236	return;
	237	} else {
	238	int j;
	239
	240	for (j = 1; j < c->argc; j++)
	241	pubsubUnsubscribeChannel(c,c->argv[j],1);
	242	}
	243	}
	244
	245	void psubscribeCommand(redisClient *c) {
	246	int j;
	247
	248	for (j = 1; j < c->argc; j++)
	249	pubsubSubscribePattern(c,c->argv[j]);
	250	}
	251
	252	void punsubscribeCommand(redisClient *c) {
	253	if (c->argc == 1) {
	254	pubsubUnsubscribeAllPatterns(c,1);
	255	return;
	256	} else {
	257	int j;
	258
	259	for (j = 1; j < c->argc; j++)
	260	pubsubUnsubscribePattern(c,c->argv[j],1);
	261	}
	262	}
	263
	264	void publishCommand(redisClient *c) {
	265	int receivers = pubsubPublishMessage(c->argv[1],c->argv[2]);
	266	addReplyLongLong(c,receivers);
	267	}