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Streams: XREAD get-keys method.

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This commit is contained in:
antirez 2017-09-08 11:40:16 +02:00
parent fa61720d30
commit 110041825c
3 changed files with 31 additions and 0 deletions
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28
src/db.c
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@ -1363,6 +1363,34 @@ int *georadiusGetKeys(struct redisCommand *cmd, robj **argv, int argc, int *numk
return keys;
}
/* XREAD [BLOCK <milliseconds>] [COUNT <count>] [GROUP <groupname> <ttl>]
* [RETRY <milliseconds> <ttl>] STREAMS key_1 ID_1 key_2 ID_2 ...
* key_N ID_N */
int *xreadGetKeys(struct redisCommand *cmd, robj **argv, int argc, int *numkeys) {
int i, num, *keys;
UNUSED(cmd);
/* We need to seek the last argument that contains "STREAMS", because other
* arguments before may contain it (for example the group name). */
int streams_pos = -1;
for (i = 1; i < argc; i++) {
char *arg = argv[i]->ptr;
if (!strcasecmp(arg, "streams")) streams_pos = i;
}
/* Syntax error. */
if (streams_pos == -1) {
*numkeys = 0;
return NULL;
}
num = argc - streams_pos - 1;
keys = zmalloc(sizeof(int) * num);
for (i = streams_pos+1; i < argc; i++) keys[i-streams_pos-1] = i;
*numkeys = num;
return keys;
}
/* Slot to Key API. This is used by Redis Cluster in order to obtain in
* a fast way a key that belongs to a specified hash slot. This is useful
* while rehashing the cluster and in other conditions when we need to

1
src/server.c
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@ -305,6 +305,7 @@ struct redisCommand redisCommandTable[] = {
{"xadd",xaddCommand,-4,"wmF",0,NULL,1,1,1,0,0},
{"xrange",xrangeCommand,-4,"r",0,NULL,1,1,1,0,0},
{"xlen",xlenCommand,2,"rF",0,NULL,1,1,1,0,0},
{"xread",xreadCommand,-3,"rs",0,xreadGetKeys,1,1,1,0,0},
{"post",securityWarningCommand,-1,"lt",0,NULL,0,0,0,0,0},
{"host:",securityWarningCommand,-1,"lt",0,NULL,0,0,0,0,0},
{"latency",latencyCommand,-2,"aslt",0,NULL,0,0,0,0,0}

2
src/server.h
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@ -1767,6 +1767,7 @@ int *evalGetKeys(struct redisCommand *cmd, robj **argv, int argc, int *numkeys);
int *sortGetKeys(struct redisCommand *cmd, robj **argv, int argc, int *numkeys);
int *migrateGetKeys(struct redisCommand *cmd, robj **argv, int argc, int *numkeys);
int *georadiusGetKeys(struct redisCommand *cmd, robj **argv, int argc, int *numkeys);
int *xreadGetKeys(struct redisCommand *cmd, robj **argv, int argc, int *numkeys);
/* Cluster */
void clusterInit(void);
@ -2011,6 +2012,7 @@ void securityWarningCommand(client *c);
void xaddCommand(client *c);
void xrangeCommand(client *c);
void xlenCommand(client *c);
void xreadCommand(client *c);
#if defined(__GNUC__)
void *calloc(size_t count, size_t size) __attribute__ ((deprecated));