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Avoids reallocating and double String on truncate

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This commit is contained in:
Itamar Haber 2016-04-25 01:41:29 -07:00 committed by antirez
parent d41bd233d5
commit 3816f16a53
1 changed files with 17 additions and 18 deletions
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15
src/module.c
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@ -1093,15 +1093,13 @@ int RM_StringTruncate(RedisModuleKey *key, size_t newlen) {
* doing anything. */ * doing anything. */
if (key->value == NULL && newlen == 0) return REDISMODULE_OK; if (key->value == NULL && newlen == 0) return REDISMODULE_OK;
/* Empty key: fill it with a zero-length key so that we can handle the
* resize with a common code path. */
if (key->value == NULL) { if (key->value == NULL) {
robj *emptyobj = createStringObject("",0); /* Empty key: create it with the new size. */
setKey(key->db,key->key,emptyobj); robj *o = createObject(OBJ_STRING,sdsnewlen(NULL, newlen));
key->value = emptyobj; setKey(key->db,key->key,o);
decrRefCount(emptyobj); key->value = o;
} decrRefCount(o);
} else {
/* Unshare and resize. */ /* Unshare and resize. */
key->value = dbUnshareStringValue(key->db, key->key, key->value); key->value = dbUnshareStringValue(key->db, key->key, key->value);
size_t curlen = sdslen(key->value->ptr); size_t curlen = sdslen(key->value->ptr);
@ -1113,6 +1111,7 @@ int RM_StringTruncate(RedisModuleKey *key, size_t newlen) {
if (sdslen(key->value->ptr) < sdsavail(key->value->ptr)) if (sdslen(key->value->ptr) < sdsavail(key->value->ptr))
key->value->ptr = sdsRemoveFreeSpace(key->value->ptr); key->value->ptr = sdsRemoveFreeSpace(key->value->ptr);
} }
}
return REDISMODULE_OK; return REDISMODULE_OK;
} }