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Support dual encoding for ZRANGEBYSCORE et al

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This commit is contained in:
Pieter Noordhuis 2011-03-09 11:29:21 +01:00
parent 4c5f0966b2
commit aff255c81d
1 changed files with 121 additions and 52 deletions
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105
src/t_zset.c
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@ -1318,10 +1318,8 @@ void zrevrangeCommand(redisClient *c) {
* If "justcount", only the number of elements in the range is returned. */
void genericZrangebyscoreCommand(redisClient *c, int reverse, int justcount) {
zrangespec range;
robj *o, *emptyreply;
zset *zsetobj;
zskiplist *zsl;
zskiplistNode *ln;
robj *key = c->argv[1];
robj *emptyreply, *zobj;
int offset = 0, limit = -1;
int withscores = 0;
unsigned long rangelen = 0;
@ -1365,18 +1363,87 @@ void genericZrangebyscoreCommand(redisClient *c, int reverse, int justcount) {
/* Ok, lookup the key and get the range */
emptyreply = justcount ? shared.czero : shared.emptymultibulk;
if ((o = lookupKeyReadOrReply(c,c->argv[1],emptyreply)) == NULL ||
checkType(c,o,REDIS_ZSET)) return;
zsetobj = o->ptr;
zsl = zsetobj->zsl;
if ((zobj = lookupKeyReadOrReply(c,key,emptyreply)) == NULL ||
checkType(c,zobj,REDIS_ZSET)) return;
if (zobj->encoding == REDIS_ENCODING_ZIPLIST) {
unsigned char *zl = zobj->ptr;
unsigned char *eptr, *sptr;
unsigned char *vstr;
unsigned int vlen;
long long vlong;
double score;
/* If reversed, get the last node in range as starting point. */
if (reverse) {
ln = zslLastInRange(zsl,range);
} else {
ln = zslFirstInRange(zsl,range);
if (reverse)
eptr = zzlLastInRange(zobj,range);
else
eptr = zzlFirstInRange(zobj,range);
/* No "first" element in the specified interval. */
if (eptr == NULL) {
addReply(c,emptyreply);
return;
}
/* Get score pointer for the first element. */
redisAssert(eptr != NULL);
sptr = ziplistNext(zl,eptr);
/* We don't know in advance how many matching elements there are in the
* list, so we push this object that will represent the multi-bulk
* length in the output buffer, and will "fix" it later */
if (!justcount)
replylen = addDeferredMultiBulkLength(c);
/* If there is an offset, just traverse the number of elements without
* checking the score because that is done in the next loop. */
while (eptr && offset--)
if (reverse)
zzlPrev(zl,&eptr,&sptr);
else
zzlNext(zl,&eptr,&sptr);
while (eptr && limit--) {
score = zzlGetScore(sptr);
/* Abort when the node is no longer in range. */
if (reverse) {
if (!zslValueGteMin(score,&range)) break;
} else {
if (!zslValueLteMax(score,&range)) break;
}
/* Do our magic */
rangelen++;
if (!justcount) {
redisAssert(ziplistGet(eptr,&vstr,&vlen,&vlong));
if (vstr == NULL)
addReplyBulkLongLong(c,vlong);
else
addReplyBulkCBuffer(c,vstr,vlen);
if (withscores)
addReplyDouble(c,score);
}
/* Move to next node */
if (reverse)
zzlPrev(zl,&eptr,&sptr);
else
zzlNext(zl,&eptr,&sptr);
}
} else if (zobj->encoding == REDIS_ENCODING_RAW) {
zset *zs = zobj->ptr;
zskiplist *zsl = zs->zsl;
zskiplistNode *ln;
/* If reversed, get the last node in range as starting point. */
if (reverse)
ln = zslLastInRange(zsl,range);
else
ln = zslFirstInRange(zsl,range);
/* No "first" element in the specified interval. */
if (ln == NULL) {
addReply(c,emptyreply);
@ -1384,16 +1451,15 @@ void genericZrangebyscoreCommand(redisClient *c, int reverse, int justcount) {
}
/* We don't know in advance how many matching elements there are in the
* list, so we push this object that will represent the multi-bulk length
* in the output buffer, and will "fix" it later */
* list, so we push this object that will represent the multi-bulk
* length in the output buffer, and will "fix" it later */
if (!justcount)
replylen = addDeferredMultiBulkLength(c);
/* If there is an offset, just traverse the number of elements without
* checking the score because that is done in the next loop. */
while(ln && offset--) {
while (ln && offset--)
ln = reverse ? ln->backward : ln->level[0].forward;
}
while (ln && limit--) {
/* Abort when the node is no longer in range. */
@ -1414,12 +1480,15 @@ void genericZrangebyscoreCommand(redisClient *c, int reverse, int justcount) {
/* Move to next node */
ln = reverse ? ln->backward : ln->level[0].forward;
}
} else {
redisPanic("Unknown sorted set encoding");
}
if (justcount) {
addReplyLongLong(c,(long)rangelen);
} else {
setDeferredMultiBulkLength(c,replylen,
withscores ? (rangelen*2) : rangelen);
if (withscores) rangelen *= 2;
setDeferredMultiBulkLength(c,replylen,rangelen);
}
}