* from tail to head, useful for ZREVRANGE. */
zskiplistNode *zslCreateNode(int level, double score, robj *obj) {
- zskiplistNode *zn = zmalloc(sizeof(*zn));
-
- zn->forward = zmalloc(sizeof(zskiplistNode*) * level);
- if (level > 1)
- zn->span = zmalloc(sizeof(unsigned int) * (level - 1));
- else
- zn->span = NULL;
+ zskiplistNode *zn = zmalloc(sizeof(*zn)+level*sizeof(struct zskiplistLevel));
zn->score = score;
zn->obj = obj;
return zn;
zsl->length = 0;
zsl->header = zslCreateNode(ZSKIPLIST_MAXLEVEL,0,NULL);
for (j = 0; j < ZSKIPLIST_MAXLEVEL; j++) {
- zsl->header->forward[j] = NULL;
-
- /* span has space for ZSKIPLIST_MAXLEVEL-1 elements */
- if (j < ZSKIPLIST_MAXLEVEL-1)
- zsl->header->span[j] = 0;
+ zsl->header->level[j].forward = NULL;
+ zsl->header->level[j].span = 0;
}
zsl->header->backward = NULL;
zsl->tail = NULL;
void zslFreeNode(zskiplistNode *node) {
decrRefCount(node->obj);
- zfree(node->forward);
- zfree(node->span);
zfree(node);
}
void zslFree(zskiplist *zsl) {
- zskiplistNode *node = zsl->header->forward[0], *next;
+ zskiplistNode *node = zsl->header->level[0].forward, *next;
- zfree(zsl->header->forward);
- zfree(zsl->header->span);
zfree(zsl->header);
while(node) {
- next = node->forward[0];
+ next = node->level[0].forward;
zslFreeNode(node);
node = next;
}
return (level<ZSKIPLIST_MAXLEVEL) ? level : ZSKIPLIST_MAXLEVEL;
}
-void zslInsert(zskiplist *zsl, double score, robj *obj) {
+zskiplistNode *zslInsert(zskiplist *zsl, double score, robj *obj) {
zskiplistNode *update[ZSKIPLIST_MAXLEVEL], *x;
unsigned int rank[ZSKIPLIST_MAXLEVEL];
int i, level;
for (i = zsl->level-1; i >= 0; i--) {
/* store rank that is crossed to reach the insert position */
rank[i] = i == (zsl->level-1) ? 0 : rank[i+1];
-
- while (x->forward[i] &&
- (x->forward[i]->score < score ||
- (x->forward[i]->score == score &&
- compareStringObjects(x->forward[i]->obj,obj) < 0))) {
- rank[i] += i > 0 ? x->span[i-1] : 1;
- x = x->forward[i];
+ while (x->level[i].forward &&
+ (x->level[i].forward->score < score ||
+ (x->level[i].forward->score == score &&
+ compareStringObjects(x->level[i].forward->obj,obj) < 0))) {
+ rank[i] += x->level[i].span;
+ x = x->level[i].forward;
}
update[i] = x;
}
for (i = zsl->level; i < level; i++) {
rank[i] = 0;
update[i] = zsl->header;
- update[i]->span[i-1] = zsl->length;
+ update[i]->level[i].span = zsl->length;
}
zsl->level = level;
}
x = zslCreateNode(level,score,obj);
for (i = 0; i < level; i++) {
- x->forward[i] = update[i]->forward[i];
- update[i]->forward[i] = x;
+ x->level[i].forward = update[i]->level[i].forward;
+ update[i]->level[i].forward = x;
/* update span covered by update[i] as x is inserted here */
- if (i > 0) {
- x->span[i-1] = update[i]->span[i-1] - (rank[0] - rank[i]);
- update[i]->span[i-1] = (rank[0] - rank[i]) + 1;
- }
+ x->level[i].span = update[i]->level[i].span - (rank[0] - rank[i]);
+ update[i]->level[i].span = (rank[0] - rank[i]) + 1;
}
/* increment span for untouched levels */
for (i = level; i < zsl->level; i++) {
- update[i]->span[i-1]++;
+ update[i]->level[i].span++;
}
x->backward = (update[0] == zsl->header) ? NULL : update[0];
- if (x->forward[0])
- x->forward[0]->backward = x;
+ if (x->level[0].forward)
+ x->level[0].forward->backward = x;
else
zsl->tail = x;
zsl->length++;
+ return x;
}
/* Internal function used by zslDelete, zslDeleteByScore and zslDeleteByRank */
void zslDeleteNode(zskiplist *zsl, zskiplistNode *x, zskiplistNode **update) {
int i;
for (i = 0; i < zsl->level; i++) {
- if (update[i]->forward[i] == x) {
- if (i > 0) {
- update[i]->span[i-1] += x->span[i-1] - 1;
- }
- update[i]->forward[i] = x->forward[i];
+ if (update[i]->level[i].forward == x) {
+ update[i]->level[i].span += x->level[i].span - 1;
+ update[i]->level[i].forward = x->level[i].forward;
} else {
- /* invariant: i > 0, because update[0]->forward[0]
- * is always equal to x */
- update[i]->span[i-1] -= 1;
+ update[i]->level[i].span -= 1;
}
}
- if (x->forward[0]) {
- x->forward[0]->backward = x->backward;
+ if (x->level[0].forward) {
+ x->level[0].forward->backward = x->backward;
} else {
zsl->tail = x->backward;
}
- while(zsl->level > 1 && zsl->header->forward[zsl->level-1] == NULL)
+ while(zsl->level > 1 && zsl->header->level[zsl->level-1].forward == NULL)
zsl->level--;
zsl->length--;
}
x = zsl->header;
for (i = zsl->level-1; i >= 0; i--) {
- while (x->forward[i] &&
- (x->forward[i]->score < score ||
- (x->forward[i]->score == score &&
- compareStringObjects(x->forward[i]->obj,obj) < 0)))
- x = x->forward[i];
+ while (x->level[i].forward &&
+ (x->level[i].forward->score < score ||
+ (x->level[i].forward->score == score &&
+ compareStringObjects(x->level[i].forward->obj,obj) < 0)))
+ x = x->level[i].forward;
update[i] = x;
}
/* We may have multiple elements with the same score, what we need
* is to find the element with both the right score and object. */
- x = x->forward[0];
+ x = x->level[0].forward;
if (x && score == x->score && equalStringObjects(x->obj,obj)) {
zslDeleteNode(zsl, x, update);
zslFreeNode(x);
return 0; /* not found */
}
+/* Struct to hold a inclusive/exclusive range spec. */
+typedef struct {
+ double min, max;
+ int minex, maxex; /* are min or max exclusive? */
+} zrangespec;
+
/* Delete all the elements with score between min and max from the skiplist.
* Min and mx are inclusive, so a score >= min || score <= max is deleted.
* Note that this function takes the reference to the hash table view of the
* sorted set, in order to remove the elements from the hash table too. */
-unsigned long zslDeleteRangeByScore(zskiplist *zsl, double min, double max, dict *dict) {
+unsigned long zslDeleteRangeByScore(zskiplist *zsl, zrangespec range, dict *dict) {
zskiplistNode *update[ZSKIPLIST_MAXLEVEL], *x;
unsigned long removed = 0;
int i;
x = zsl->header;
for (i = zsl->level-1; i >= 0; i--) {
- while (x->forward[i] && x->forward[i]->score < min)
- x = x->forward[i];
+ while (x->level[i].forward && (range.minex ?
+ x->level[i].forward->score <= range.min :
+ x->level[i].forward->score < range.min))
+ x = x->level[i].forward;
update[i] = x;
}
- /* We may have multiple elements with the same score, what we need
- * is to find the element with both the right score and object. */
- x = x->forward[0];
- while (x && x->score <= max) {
- zskiplistNode *next = x->forward[0];
- zslDeleteNode(zsl, x, update);
+
+ /* Current node is the last with score < or <= min. */
+ x = x->level[0].forward;
+
+ /* Delete nodes while in range. */
+ while (x && (range.maxex ? x->score < range.max : x->score <= range.max)) {
+ zskiplistNode *next = x->level[0].forward;
+ zslDeleteNode(zsl,x,update);
dictDelete(dict,x->obj);
zslFreeNode(x);
removed++;
x = next;
}
- return removed; /* not found */
+ return removed;
}
/* Delete all the elements with rank between start and end from the skiplist.
x = zsl->header;
for (i = zsl->level-1; i >= 0; i--) {
- while (x->forward[i] && (traversed + (i > 0 ? x->span[i-1] : 1)) < start) {
- traversed += i > 0 ? x->span[i-1] : 1;
- x = x->forward[i];
+ while (x->level[i].forward && (traversed + x->level[i].span) < start) {
+ traversed += x->level[i].span;
+ x = x->level[i].forward;
}
update[i] = x;
}
traversed++;
- x = x->forward[0];
+ x = x->level[0].forward;
while (x && traversed <= end) {
- zskiplistNode *next = x->forward[0];
- zslDeleteNode(zsl, x, update);
+ zskiplistNode *next = x->level[0].forward;
+ zslDeleteNode(zsl,x,update);
dictDelete(dict,x->obj);
zslFreeNode(x);
removed++;
x = zsl->header;
for (i = zsl->level-1; i >= 0; i--) {
- while (x->forward[i] && x->forward[i]->score < score)
- x = x->forward[i];
+ while (x->level[i].forward && x->level[i].forward->score < score)
+ x = x->level[i].forward;
}
/* We may have multiple elements with the same score, what we need
* is to find the element with both the right score and object. */
- return x->forward[0];
+ return x->level[0].forward;
}
/* Find the rank for an element by both score and key.
x = zsl->header;
for (i = zsl->level-1; i >= 0; i--) {
- while (x->forward[i] &&
- (x->forward[i]->score < score ||
- (x->forward[i]->score == score &&
- compareStringObjects(x->forward[i]->obj,o) <= 0))) {
- rank += i > 0 ? x->span[i-1] : 1;
- x = x->forward[i];
+ while (x->level[i].forward &&
+ (x->level[i].forward->score < score ||
+ (x->level[i].forward->score == score &&
+ compareStringObjects(x->level[i].forward->obj,o) <= 0))) {
+ rank += x->level[i].span;
+ x = x->level[i].forward;
}
/* x might be equal to zsl->header, so test if obj is non-NULL */
x = zsl->header;
for (i = zsl->level-1; i >= 0; i--) {
- while (x->forward[i] && (traversed + (i>0 ? x->span[i-1] : 1)) <= rank)
+ while (x->level[i].forward && (traversed + x->level[i].span) <= rank)
{
- traversed += i > 0 ? x->span[i-1] : 1;
- x = x->forward[i];
+ traversed += x->level[i].span;
+ x = x->level[i].forward;
}
if (traversed == rank) {
return x;
return NULL;
}
+/* Populate the rangespec according to the objects min and max. */
+static int zslParseRange(robj *min, robj *max, zrangespec *spec) {
+ char *eptr;
+ spec->minex = spec->maxex = 0;
+
+ /* Parse the min-max interval. If one of the values is prefixed
+ * by the "(" character, it's considered "open". For instance
+ * ZRANGEBYSCORE zset (1.5 (2.5 will match min < x < max
+ * ZRANGEBYSCORE zset 1.5 2.5 will instead match min <= x <= max */
+ if (min->encoding == REDIS_ENCODING_INT) {
+ spec->min = (long)min->ptr;
+ } else {
+ if (((char*)min->ptr)[0] == '(') {
+ spec->min = strtod((char*)min->ptr+1,&eptr);
+ if (eptr[0] != '\0' || isnan(spec->min)) return REDIS_ERR;
+ spec->minex = 1;
+ } else {
+ spec->min = strtod((char*)min->ptr,&eptr);
+ if (eptr[0] != '\0' || isnan(spec->min)) return REDIS_ERR;
+ }
+ }
+ if (max->encoding == REDIS_ENCODING_INT) {
+ spec->max = (long)max->ptr;
+ } else {
+ if (((char*)max->ptr)[0] == '(') {
+ spec->max = strtod((char*)max->ptr+1,&eptr);
+ if (eptr[0] != '\0' || isnan(spec->max)) return REDIS_ERR;
+ spec->maxex = 1;
+ } else {
+ spec->max = strtod((char*)max->ptr,&eptr);
+ if (eptr[0] != '\0' || isnan(spec->max)) return REDIS_ERR;
+ }
+ }
+
+ return REDIS_OK;
+}
+
+
/*-----------------------------------------------------------------------------
* Sorted set commands
*----------------------------------------------------------------------------*/
-/* This generic command implements both ZADD and ZINCRBY.
- * scoreval is the score if the operation is a ZADD (doincrement == 0) or
- * the increment if the operation is a ZINCRBY (doincrement == 1). */
-void zaddGenericCommand(redisClient *c, robj *key, robj *ele, double scoreval, int doincrement) {
+/* This generic command implements both ZADD and ZINCRBY. */
+void zaddGenericCommand(redisClient *c, robj *key, robj *ele, double score, int incr) {
robj *zsetobj;
zset *zs;
- double *score;
+ zskiplistNode *znode;
zsetobj = lookupKeyWrite(c->db,key);
if (zsetobj == NULL) {
}
zs = zsetobj->ptr;
- /* Ok now since we implement both ZADD and ZINCRBY here the code
- * needs to handle the two different conditions. It's all about setting
- * '*score', that is, the new score to set, to the right value. */
- score = zmalloc(sizeof(double));
- if (doincrement) {
- dictEntry *de;
-
+ /* Since both ZADD and ZINCRBY are implemented here, we need to increment
+ * the score first by the current score if ZINCRBY is called. */
+ if (incr) {
/* Read the old score. If the element was not present starts from 0 */
- de = dictFind(zs->dict,ele);
- if (de) {
- double *oldscore = dictGetEntryVal(de);
- *score = *oldscore + scoreval;
- } else {
- *score = scoreval;
- }
- if (isnan(*score)) {
+ dictEntry *de = dictFind(zs->dict,ele);
+ if (de != NULL)
+ score += *(double*)dictGetEntryVal(de);
+
+ if (isnan(score)) {
addReplyError(c,"resulting score is not a number (NaN)");
- zfree(score);
/* Note that we don't need to check if the zset may be empty and
* should be removed here, as we can only obtain Nan as score if
* there was already an element in the sorted set. */
return;
}
- } else {
- *score = scoreval;
}
- /* What follows is a simple remove and re-insert operation that is common
- * to both ZADD and ZINCRBY... */
- if (dictAdd(zs->dict,ele,score) == DICT_OK) {
- /* case 1: New element */
+ /* We need to remove and re-insert the element when it was already present
+ * in the dictionary, to update the skiplist. Note that we delay adding a
+ * pointer to the score because we want to reference the score in the
+ * skiplist node. */
+ if (dictAdd(zs->dict,ele,NULL) == DICT_OK) {
+ dictEntry *de;
+
+ /* New element */
incrRefCount(ele); /* added to hash */
- zslInsert(zs->zsl,*score,ele);
+ znode = zslInsert(zs->zsl,score,ele);
incrRefCount(ele); /* added to skiplist */
- touchWatchedKey(c->db,c->argv[1]);
+
+ /* Update the score in the dict entry */
+ de = dictFind(zs->dict,ele);
+ redisAssert(de != NULL);
+ dictGetEntryVal(de) = &znode->score;
+ signalModifiedKey(c->db,c->argv[1]);
server.dirty++;
- if (doincrement)
- addReplyDouble(c,*score);
+ if (incr)
+ addReplyDouble(c,score);
else
addReply(c,shared.cone);
} else {
dictEntry *de;
- double *oldscore;
+ robj *curobj;
+ double *curscore;
+ int deleted;
- /* case 2: Score update operation */
+ /* Update score */
de = dictFind(zs->dict,ele);
redisAssert(de != NULL);
- oldscore = dictGetEntryVal(de);
- if (*score != *oldscore) {
- int deleted;
+ curobj = dictGetEntryKey(de);
+ curscore = dictGetEntryVal(de);
- /* Remove and insert the element in the skip list with new score */
- deleted = zslDelete(zs->zsl,*oldscore,ele);
+ /* When the score is updated, reuse the existing string object to
+ * prevent extra alloc/dealloc of strings on ZINCRBY. */
+ if (score != *curscore) {
+ deleted = zslDelete(zs->zsl,*curscore,curobj);
redisAssert(deleted != 0);
- zslInsert(zs->zsl,*score,ele);
- incrRefCount(ele);
- /* Update the score in the hash table */
- dictReplace(zs->dict,ele,score);
- touchWatchedKey(c->db,c->argv[1]);
+ znode = zslInsert(zs->zsl,score,curobj);
+ incrRefCount(curobj);
+
+ /* Update the score in the current dict entry */
+ dictGetEntryVal(de) = &znode->score;
+ signalModifiedKey(c->db,c->argv[1]);
server.dirty++;
- } else {
- zfree(score);
}
- if (doincrement)
- addReplyDouble(c,*score);
+ if (incr)
+ addReplyDouble(c,score);
else
addReply(c,shared.czero);
}
void zaddCommand(redisClient *c) {
double scoreval;
if (getDoubleFromObjectOrReply(c,c->argv[2],&scoreval,NULL) != REDIS_OK) return;
+ c->argv[3] = tryObjectEncoding(c->argv[3]);
zaddGenericCommand(c,c->argv[1],c->argv[3],scoreval,0);
}
void zincrbyCommand(redisClient *c) {
double scoreval;
if (getDoubleFromObjectOrReply(c,c->argv[2],&scoreval,NULL) != REDIS_OK) return;
+ c->argv[3] = tryObjectEncoding(c->argv[3]);
zaddGenericCommand(c,c->argv[1],c->argv[3],scoreval,1);
}
robj *zsetobj;
zset *zs;
dictEntry *de;
- double *oldscore;
+ double curscore;
int deleted;
if ((zsetobj = lookupKeyWriteOrReply(c,c->argv[1],shared.czero)) == NULL ||
checkType(c,zsetobj,REDIS_ZSET)) return;
zs = zsetobj->ptr;
+ c->argv[2] = tryObjectEncoding(c->argv[2]);
de = dictFind(zs->dict,c->argv[2]);
if (de == NULL) {
addReply(c,shared.czero);
return;
}
/* Delete from the skiplist */
- oldscore = dictGetEntryVal(de);
- deleted = zslDelete(zs->zsl,*oldscore,c->argv[2]);
+ curscore = *(double*)dictGetEntryVal(de);
+ deleted = zslDelete(zs->zsl,curscore,c->argv[2]);
redisAssert(deleted != 0);
/* Delete from the hash table */
dictDelete(zs->dict,c->argv[2]);
if (htNeedsResize(zs->dict)) dictResize(zs->dict);
if (dictSize(zs->dict) == 0) dbDelete(c->db,c->argv[1]);
- touchWatchedKey(c->db,c->argv[1]);
+ signalModifiedKey(c->db,c->argv[1]);
server.dirty++;
addReply(c,shared.cone);
}
void zremrangebyscoreCommand(redisClient *c) {
- double min;
- double max;
+ zrangespec range;
long deleted;
- robj *zsetobj;
+ robj *o;
zset *zs;
- if ((getDoubleFromObjectOrReply(c, c->argv[2], &min, NULL) != REDIS_OK) ||
- (getDoubleFromObjectOrReply(c, c->argv[3], &max, NULL) != REDIS_OK)) return;
+ /* Parse the range arguments. */
+ if (zslParseRange(c->argv[2],c->argv[3],&range) != REDIS_OK) {
+ addReplyError(c,"min or max is not a double");
+ return;
+ }
- if ((zsetobj = lookupKeyWriteOrReply(c,c->argv[1],shared.czero)) == NULL ||
- checkType(c,zsetobj,REDIS_ZSET)) return;
+ if ((o = lookupKeyWriteOrReply(c,c->argv[1],shared.czero)) == NULL ||
+ checkType(c,o,REDIS_ZSET)) return;
- zs = zsetobj->ptr;
- deleted = zslDeleteRangeByScore(zs->zsl,min,max,zs->dict);
+ zs = o->ptr;
+ deleted = zslDeleteRangeByScore(zs->zsl,range,zs->dict);
if (htNeedsResize(zs->dict)) dictResize(zs->dict);
if (dictSize(zs->dict) == 0) dbDelete(c->db,c->argv[1]);
- if (deleted) touchWatchedKey(c->db,c->argv[1]);
+ if (deleted) signalModifiedKey(c->db,c->argv[1]);
server.dirty += deleted;
addReplyLongLong(c,deleted);
}
deleted = zslDeleteRangeByRank(zs->zsl,start+1,end+1,zs->dict);
if (htNeedsResize(zs->dict)) dictResize(zs->dict);
if (dictSize(zs->dict) == 0) dbDelete(c->db,c->argv[1]);
- if (deleted) touchWatchedKey(c->db,c->argv[1]);
+ if (deleted) signalModifiedKey(c->db,c->argv[1]);
server.dirty += deleted;
addReplyLongLong(c, deleted);
}
zsetopsrc *src;
robj *dstobj;
zset *dstzset;
+ zskiplistNode *znode;
dictIterator *di;
dictEntry *de;
int touched = 0;
* from small to large, all src[i > 0].dict are non-empty too */
di = dictGetIterator(src[0].dict);
while((de = dictNext(di)) != NULL) {
- double *score = zmalloc(sizeof(double)), value;
- *score = src[0].weight * zunionInterDictValue(de);
+ double score, value;
+ score = src[0].weight * zunionInterDictValue(de);
for (j = 1; j < setnum; j++) {
dictEntry *other = dictFind(src[j].dict,dictGetEntryKey(de));
if (other) {
value = src[j].weight * zunionInterDictValue(other);
- zunionInterAggregate(score, value, aggregate);
+ zunionInterAggregate(&score,value,aggregate);
} else {
break;
}
}
- /* skip entry when not present in every source dict */
- if (j != setnum) {
- zfree(score);
- } else {
+ /* Only continue when present in every source dict. */
+ if (j == setnum) {
robj *o = dictGetEntryKey(de);
- dictAdd(dstzset->dict,o,score);
- incrRefCount(o); /* added to dictionary */
- zslInsert(dstzset->zsl,*score,o);
+ znode = zslInsert(dstzset->zsl,score,o);
incrRefCount(o); /* added to skiplist */
+ dictAdd(dstzset->dict,o,&znode->score);
+ incrRefCount(o); /* added to dictionary */
}
}
dictReleaseIterator(di);
di = dictGetIterator(src[i].dict);
while((de = dictNext(di)) != NULL) {
+ double score, value;
+
/* skip key when already processed */
- if (dictFind(dstzset->dict,dictGetEntryKey(de)) != NULL) continue;
+ if (dictFind(dstzset->dict,dictGetEntryKey(de)) != NULL)
+ continue;
- double *score = zmalloc(sizeof(double)), value;
- *score = src[i].weight * zunionInterDictValue(de);
+ /* initialize score */
+ score = src[i].weight * zunionInterDictValue(de);
/* because the zsets are sorted by size, its only possible
* for sets at larger indices to hold this entry */
dictEntry *other = dictFind(src[j].dict,dictGetEntryKey(de));
if (other) {
value = src[j].weight * zunionInterDictValue(other);
- zunionInterAggregate(score, value, aggregate);
+ zunionInterAggregate(&score,value,aggregate);
}
}
robj *o = dictGetEntryKey(de);
- dictAdd(dstzset->dict,o,score);
- incrRefCount(o); /* added to dictionary */
- zslInsert(dstzset->zsl,*score,o);
+ znode = zslInsert(dstzset->zsl,score,o);
incrRefCount(o); /* added to skiplist */
+ dictAdd(dstzset->dict,o,&znode->score);
+ incrRefCount(o); /* added to dictionary */
}
dictReleaseIterator(di);
}
}
if (dbDelete(c->db,dstkey)) {
- touchWatchedKey(c->db,dstkey);
+ signalModifiedKey(c->db,dstkey);
touched = 1;
server.dirty++;
}
if (dstzset->zsl->length) {
dbAdd(c->db,dstkey,dstobj);
addReplyLongLong(c, dstzset->zsl->length);
- if (!touched) touchWatchedKey(c->db,dstkey);
+ if (!touched) signalModifiedKey(c->db,dstkey);
server.dirty++;
} else {
decrRefCount(dstobj);
ln = start == 0 ? zsl->tail : zslistTypeGetElementByRank(zsl, llen-start);
} else {
ln = start == 0 ?
- zsl->header->forward[0] : zslistTypeGetElementByRank(zsl, start+1);
+ zsl->header->level[0].forward : zslistTypeGetElementByRank(zsl, start+1);
}
/* Return the result in form of a multi-bulk reply */
addReplyBulk(c,ele);
if (withscores)
addReplyDouble(c,ln->score);
- ln = reverse ? ln->backward : ln->forward[0];
+ ln = reverse ? ln->backward : ln->level[0].forward;
}
}
zrangeGenericCommand(c,1);
}
-/* This command implements both ZRANGEBYSCORE and ZCOUNT.
- * If justcount is non-zero, just the count is returned. */
-void genericZrangebyscoreCommand(redisClient *c, int justcount) {
- robj *o;
- double min, max;
- int minex = 0, maxex = 0; /* are min or max exclusive? */
+/* This command implements ZRANGEBYSCORE, ZREVRANGEBYSCORE and ZCOUNT.
+ * 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;
int offset = 0, limit = -1;
int withscores = 0;
- int badsyntax = 0;
+ unsigned long rangelen = 0;
+ void *replylen = NULL;
- /* Parse the min-max interval. If one of the values is prefixed
- * by the "(" character, it's considered "open". For instance
- * ZRANGEBYSCORE zset (1.5 (2.5 will match min < x < max
- * ZRANGEBYSCORE zset 1.5 2.5 will instead match min <= x <= max */
- if (((char*)c->argv[2]->ptr)[0] == '(') {
- min = strtod((char*)c->argv[2]->ptr+1,NULL);
- minex = 1;
- } else {
- min = strtod(c->argv[2]->ptr,NULL);
- }
- if (((char*)c->argv[3]->ptr)[0] == '(') {
- max = strtod((char*)c->argv[3]->ptr+1,NULL);
- maxex = 1;
- } else {
- max = strtod(c->argv[3]->ptr,NULL);
+ /* Parse the range arguments. */
+ if (zslParseRange(c->argv[2],c->argv[3],&range) != REDIS_OK) {
+ addReplyError(c,"min or max is not a double");
+ return;
}
- /* Parse "WITHSCORES": note that if the command was called with
- * the name ZCOUNT then we are sure that c->argc == 4, so we'll never
- * enter the following paths to parse WITHSCORES and LIMIT. */
- if (c->argc == 5 || c->argc == 8) {
- if (strcasecmp(c->argv[c->argc-1]->ptr,"withscores") == 0)
- withscores = 1;
- else
- badsyntax = 1;
+ /* Parse optional extra arguments. Note that ZCOUNT will exactly have
+ * 4 arguments, so we'll never enter the following code path. */
+ if (c->argc > 4) {
+ int remaining = c->argc - 4;
+ int pos = 4;
+
+ while (remaining) {
+ if (remaining >= 1 && !strcasecmp(c->argv[pos]->ptr,"withscores")) {
+ pos++; remaining--;
+ withscores = 1;
+ } else if (remaining >= 3 && !strcasecmp(c->argv[pos]->ptr,"limit")) {
+ offset = atoi(c->argv[pos+1]->ptr);
+ limit = atoi(c->argv[pos+2]->ptr);
+ pos += 3; remaining -= 3;
+ } else {
+ addReply(c,shared.syntaxerr);
+ return;
+ }
+ }
}
- if (c->argc != (4 + withscores) && c->argc != (7 + withscores))
- badsyntax = 1;
- if (badsyntax) {
- addReplyError(c,"wrong number of arguments for ZRANGEBYSCORE");
- return;
+
+ /* 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 reversed, assume the elements are sorted from high to low score. */
+ ln = zslFirstWithScore(zsl,range.min);
+ if (reverse) {
+ /* If range.min is out of range, ln will be NULL and we need to use
+ * the tail of the skiplist as first node of the range. */
+ if (ln == NULL) ln = zsl->tail;
+
+ /* zslFirstWithScore returns the first element with where with
+ * score >= range.min, so backtrack to make sure the element we use
+ * here has score <= range.min. */
+ while (ln && ln->score > range.min) ln = ln->backward;
+
+ /* Move to the right element according to the range spec. */
+ if (range.minex) {
+ /* Find last element with score < range.min */
+ while (ln && ln->score == range.min) ln = ln->backward;
+ } else {
+ /* Find last element with score <= range.min */
+ while (ln && ln->level[0].forward &&
+ ln->level[0].forward->score == range.min)
+ ln = ln->level[0].forward;
+ }
+ } else {
+ if (range.minex) {
+ /* Find first element with score > range.min */
+ while (ln && ln->score == range.min) ln = ln->level[0].forward;
+ }
}
- /* Parse "LIMIT" */
- if (c->argc == (7 + withscores) && strcasecmp(c->argv[4]->ptr,"limit")) {
- addReply(c,shared.syntaxerr);
+ /* No "first" element in the specified interval. */
+ if (ln == NULL) {
+ addReply(c,emptyreply);
return;
- } else if (c->argc == (7 + withscores)) {
- offset = atoi(c->argv[5]->ptr);
- limit = atoi(c->argv[6]->ptr);
- if (offset < 0) offset = 0;
}
- /* Ok, lookup the key and get the range */
- o = lookupKeyRead(c->db,c->argv[1]);
- if (o == NULL) {
- addReply(c,justcount ? shared.czero : shared.emptymultibulk);
- } else {
- if (o->type != REDIS_ZSET) {
- addReply(c,shared.wrongtypeerr);
- } else {
- zset *zsetobj = o->ptr;
- zskiplist *zsl = zsetobj->zsl;
- zskiplistNode *ln;
- robj *ele;
- void *replylen = NULL;
- unsigned long rangelen = 0;
-
- /* Get the first node with the score >= min, or with
- * score > min if 'minex' is true. */
- ln = zslFirstWithScore(zsl,min);
- while (minex && ln && ln->score == min) ln = ln->forward[0];
-
- if (ln == NULL) {
- /* No element matching the speciifed interval */
- addReply(c,justcount ? shared.czero : shared.emptymultibulk);
- return;
- }
+ /* 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(ln && offset--) {
+ if (reverse)
+ ln = ln->backward;
+ else
+ ln = ln->level[0].forward;
+ }
- /* 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);
-
- while(ln && (maxex ? (ln->score < max) : (ln->score <= max))) {
- if (offset) {
- offset--;
- ln = ln->forward[0];
- continue;
- }
- if (limit == 0) break;
- if (!justcount) {
- ele = ln->obj;
- addReplyBulk(c,ele);
- if (withscores)
- addReplyDouble(c,ln->score);
- }
- ln = ln->forward[0];
- rangelen++;
- if (limit > 0) limit--;
+ while (ln && limit--) {
+ /* Check if this this element is in range. */
+ if (reverse) {
+ if (range.maxex) {
+ /* Element should have score > range.max */
+ if (ln->score <= range.max) break;
+ } else {
+ /* Element should have score >= range.max */
+ if (ln->score < range.max) break;
}
- if (justcount) {
- addReplyLongLong(c,(long)rangelen);
+ } else {
+ if (range.maxex) {
+ /* Element should have score < range.max */
+ if (ln->score >= range.max) break;
} else {
- setDeferredMultiBulkLength(c,replylen,
- withscores ? (rangelen*2) : rangelen);
+ /* Element should have score <= range.max */
+ if (ln->score > range.max) break;
}
}
+
+ /* Do our magic */
+ rangelen++;
+ if (!justcount) {
+ addReplyBulk(c,ln->obj);
+ if (withscores)
+ addReplyDouble(c,ln->score);
+ }
+
+ if (reverse)
+ ln = ln->backward;
+ else
+ ln = ln->level[0].forward;
+ }
+
+ if (justcount) {
+ addReplyLongLong(c,(long)rangelen);
+ } else {
+ setDeferredMultiBulkLength(c,replylen,
+ withscores ? (rangelen*2) : rangelen);
}
}
void zrangebyscoreCommand(redisClient *c) {
- genericZrangebyscoreCommand(c,0);
+ genericZrangebyscoreCommand(c,0,0);
+}
+
+void zrevrangebyscoreCommand(redisClient *c) {
+ genericZrangebyscoreCommand(c,1,0);
}
void zcountCommand(redisClient *c) {
- genericZrangebyscoreCommand(c,1);
+ genericZrangebyscoreCommand(c,0,1);
}
void zcardCommand(redisClient *c) {
checkType(c,o,REDIS_ZSET)) return;
zs = o->ptr;
+ c->argv[2] = tryObjectEncoding(c->argv[2]);
de = dictFind(zs->dict,c->argv[2]);
if (!de) {
addReply(c,shared.nullbulk);
zs = o->ptr;
zsl = zs->zsl;
+ c->argv[2] = tryObjectEncoding(c->argv[2]);
de = dictFind(zs->dict,c->argv[2]);
if (!de) {
addReply(c,shared.nullbulk);
projects / redis.git / blobdiff