X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/cea8c5cd75b88cd5a13d9b253d792cc045d28b62..d2906893e8c5aaab000cdd150c2be6ce4f453190:/src/sort.c diff --git a/src/sort.c b/src/sort.c index 1cf8932e..3f02e49a 100644 --- a/src/sort.c +++ b/src/sort.c @@ -1,5 +1,6 @@ #include "redis.h" #include "pqsort.h" /* Partial qsort for SORT+LIMIT */ +#include /* isnan() */ redisSortOperation *createSortOperation(int type, robj *pattern) { redisSortOperation *so = zmalloc(sizeof(*so)); @@ -102,7 +103,10 @@ int sortCompare(const void *s1, const void *s2) { } else if (so1->u.score < so2->u.score) { cmp = -1; } else { - cmp = 0; + /* Objects have the same score, but we don't want the comparison + * to be undefined, so we compare objects lexicographycally. + * This way the result of SORT is deterministic. */ + cmp = compareStringObjects(so1->obj,so2->obj); } } else { /* Alphanumeric sorting */ @@ -133,19 +137,16 @@ void sortCommand(redisClient *c) { list *operations; unsigned int outputlen = 0; int desc = 0, alpha = 0; - int limit_start = 0, limit_count = -1, start, end; + long limit_start = 0, limit_count = -1, start, end; int j, dontsort = 0, vectorlen; int getop = 0; /* GET operation counter */ + int int_convertion_error = 0; robj *sortval, *sortby = NULL, *storekey = NULL; redisSortObject *vector; /* Resulting vector to sort */ /* Lookup the key to sort. It must be of the right types */ sortval = lookupKeyRead(c->db,c->argv[1]); - if (sortval == NULL) { - addReply(c,shared.emptymultibulk); - return; - } - if (sortval->type != REDIS_SET && sortval->type != REDIS_LIST && + if (sortval && sortval->type != REDIS_SET && sortval->type != REDIS_LIST && sortval->type != REDIS_ZSET) { addReply(c,shared.wrongtypeerr); @@ -161,7 +162,10 @@ void sortCommand(redisClient *c) { /* Now we need to protect sortval incrementing its count, in the future * SORT may have options able to overwrite/delete keys during the sorting * and the sorted key itself may get destroied */ - incrRefCount(sortval); + if (sortval) + incrRefCount(sortval); + else + sortval = createListObject(); /* The SORT command has an SQL-alike syntax, parse it */ while(j < c->argc) { @@ -173,8 +177,8 @@ void sortCommand(redisClient *c) { } else if (!strcasecmp(c->argv[j]->ptr,"alpha")) { alpha = 1; } else if (!strcasecmp(c->argv[j]->ptr,"limit") && leftargs >= 2) { - limit_start = atoi(c->argv[j+1]->ptr); - limit_count = atoi(c->argv[j+2]->ptr); + if ((getLongFromObjectOrReply(c, c->argv[j+1], &limit_start, NULL) != REDIS_OK) || + (getLongFromObjectOrReply(c, c->argv[j+2], &limit_count, NULL) != REDIS_OK)) return; j+=2; } else if (!strcasecmp(c->argv[j]->ptr,"store") && leftargs >= 1) { storekey = c->argv[j+1]; @@ -199,6 +203,19 @@ void sortCommand(redisClient *c) { j++; } + /* If we have STORE we need to force sorting for deterministic output + * and replication. We use alpha sorting since this is guaranteed to + * work with any input. */ + if (storekey && dontsort) { + dontsort = 0; + alpha = 1; + sortby = NULL; + } + + /* Destructively convert encoded sorted sets for SORT. */ + if (sortval->type == REDIS_ZSET) + zsetConvert(sortval, REDIS_ENCODING_SKIPLIST); + /* Load the sorting vector with all the objects to sort */ switch(sortval->type) { case REDIS_LIST: vectorlen = listTypeLength(sortval); break; @@ -235,7 +252,7 @@ void sortCommand(redisClient *c) { dictEntry *setele; di = dictGetIterator(set); while((setele = dictNext(di)) != NULL) { - vector[j].obj = dictGetEntryKey(setele); + vector[j].obj = dictGetKey(setele); vector[j].u.score = 0; vector[j].u.cmpobj = NULL; j++; @@ -244,7 +261,7 @@ void sortCommand(redisClient *c) { } else { redisPanic("Unknown type"); } - redisAssert(j == vectorlen); + redisAssertWithInfo(c,sortval,j == vectorlen); /* Now it's time to load the right scores in the sorting vector */ if (dontsort == 0) { @@ -263,14 +280,21 @@ void sortCommand(redisClient *c) { if (sortby) vector[j].u.cmpobj = getDecodedObject(byval); } else { if (byval->encoding == REDIS_ENCODING_RAW) { - vector[j].u.score = strtod(byval->ptr,NULL); + char *eptr; + + vector[j].u.score = strtod(byval->ptr,&eptr); + if (eptr[0] != '\0' || errno == ERANGE || + isnan(vector[j].u.score)) + { + int_convertion_error = 1; + } } else if (byval->encoding == REDIS_ENCODING_INT) { /* Don't need to decode the object if it's * integer-encoded (the only encoding supported) so * far. We can just cast it */ vector[j].u.score = (long)byval->ptr; } else { - redisAssert(1 != 1); + redisAssertWithInfo(c,sortval,1 != 1); } } @@ -292,6 +316,7 @@ void sortCommand(redisClient *c) { } if (end >= vectorlen) end = vectorlen-1; + server.sort_dontsort = dontsort; if (dontsort == 0) { server.sort_desc = desc; server.sort_alpha = alpha; @@ -305,7 +330,9 @@ void sortCommand(redisClient *c) { /* Send command output to the output buffer, performing the specified * GET/DEL/INCR/DECR operations if any. */ outputlen = getop ? getop*(end-start+1) : end-start+1; - if (storekey == NULL) { + if (int_convertion_error) { + addReplyError(c,"One or more scores can't be converted into double"); + } else if (storekey == NULL) { /* STORE option not specified, sent the sorting result to client */ addReplyMultiBulkLen(c,outputlen); for (j = start; j <= end; j++) { @@ -327,7 +354,8 @@ void sortCommand(redisClient *c) { decrRefCount(val); } } else { - redisAssert(sop->type == REDIS_SORT_GET); /* always fails */ + /* Always fails */ + redisAssertWithInfo(c,sortval,sop->type == REDIS_SORT_GET); } } } @@ -357,18 +385,20 @@ void sortCommand(redisClient *c) { listTypePush(sobj,val,REDIS_TAIL); decrRefCount(val); } else { - /* always fails */ - redisAssert(sop->type == REDIS_SORT_GET); + /* Always fails */ + redisAssertWithInfo(c,sortval,sop->type == REDIS_SORT_GET); } } } } - dbReplace(c->db,storekey,sobj); - /* Note: we add 1 because the DB is dirty anyway since even if the - * SORT result is empty a new key is set and maybe the old content - * replaced. */ - server.dirty += 1+outputlen; - signalModifiedKey(c->db,storekey); + if (outputlen) { + setKey(c->db,storekey,sobj); + server.dirty += outputlen; + } else if (dbDelete(c->db,storekey)) { + signalModifiedKey(c->db,storekey); + server.dirty++; + } + decrRefCount(sobj); addReplyLongLong(c,outputlen); }