}
}
-/* Get the value from a hash identified by key. Returns either a string
- * object or NULL if the value cannot be found. The refcount of the object
- * is always increased by 1 when the value was found. */
-robj *hashTypeGet(robj *o, robj *key) {
- robj *value = NULL;
+/* Get the value from a hash identified by key.
+ *
+ * If the string is found either REDIS_ENCODING_HT or REDIS_ENCODING_ZIPMAP
+ * is returned, and either **objval or **v and *vlen are set accordingly,
+ * so that objects in hash tables are returend as objects and pointers
+ * inside a zipmap are returned as such.
+ *
+ * If the object was not found -1 is returned.
+ *
+ * This function is copy on write friendly as there is no incr/decr
+ * of refcount needed if objects are accessed just for reading operations. */
+int hashTypeGet(robj *o, robj *key, robj **objval, unsigned char **v,
+ unsigned int *vlen)
+{
if (o->encoding == REDIS_ENCODING_ZIPMAP) {
- unsigned char *v;
- unsigned int vlen;
+ int found;
+
key = getDecodedObject(key);
- if (zipmapGet(o->ptr,key->ptr,sdslen(key->ptr),&v,&vlen)) {
- value = createStringObject((char*)v,vlen);
- }
+ found = zipmapGet(o->ptr,key->ptr,sdslen(key->ptr),v,vlen);
decrRefCount(key);
+ if (!found) return -1;
} else {
dictEntry *de = dictFind(o->ptr,key);
- if (de != NULL) {
- value = dictGetEntryVal(de);
- incrRefCount(value);
- }
+ if (de == NULL) return -1;
+ *objval = dictGetEntryVal(de);
+ }
+ return o->encoding;
+}
+
+/* Higher level function of hashTypeGet() that always returns a Redis
+ * object (either new or with refcount incremented), so that the caller
+ * can retain a reference or call decrRefCount after the usage.
+ *
+ * The lower level function can prevent copy on write so it is
+ * the preferred way of doing read operations. */
+robj *hashTypeGetObject(robj *o, robj *key) {
+ robj *objval;
+ unsigned char *v;
+ unsigned int vlen;
+
+ int encoding = hashTypeGet(o,key,&objval,&v,&vlen);
+ switch(encoding) {
+ case REDIS_ENCODING_HT:
+ incrRefCount(objval);
+ return objval;
+ case REDIS_ENCODING_ZIPMAP:
+ objval = createStringObject((char*)v,vlen);
+ return objval;
+ default: return NULL;
}
- return value;
}
/* Test if the key exists in the given hash. Returns 1 if the key
}
/* Get key or value object at current iteration position.
- * This increases the refcount of the field object by 1. */
-robj *hashTypeCurrent(hashTypeIterator *hi, int what) {
- robj *o;
+ * The returned item differs with the hash object encoding:
+ * - When encoding is REDIS_ENCODING_HT, the objval pointer is populated
+ * with the original object.
+ * - When encoding is REDIS_ENCODING_ZIPMAP, a pointer to the string and
+ * its length is retunred populating the v and vlen pointers.
+ * This function is copy on write friendly as accessing objects in read only
+ * does not require writing to any memory page.
+ *
+ * The function returns the encoding of the object, so that the caller
+ * can underestand if the key or value was returned as object or C string. */
+int hashTypeCurrent(hashTypeIterator *hi, int what, robj **objval, unsigned char **v, unsigned int *vlen) {
if (hi->encoding == REDIS_ENCODING_ZIPMAP) {
if (what & REDIS_HASH_KEY) {
- o = createStringObject((char*)hi->zk,hi->zklen);
+ *v = hi->zk;
+ *vlen = hi->zklen;
} else {
- o = createStringObject((char*)hi->zv,hi->zvlen);
+ *v = hi->zv;
+ *vlen = hi->zvlen;
}
} else {
- if (what & REDIS_HASH_KEY) {
- o = dictGetEntryKey(hi->de);
- } else {
- o = dictGetEntryVal(hi->de);
- }
- incrRefCount(o);
+ if (what & REDIS_HASH_KEY)
+ *objval = dictGetEntryKey(hi->de);
+ else
+ *objval = dictGetEntryVal(hi->de);
+ }
+ return hi->encoding;
+}
+
+/* A non copy-on-write friendly but higher level version of hashTypeCurrent()
+ * that always returns an object with refcount incremented by one (or a new
+ * object), so it's up to the caller to decrRefCount() the object if no
+ * reference is retained. */
+robj *hashTypeCurrentObject(hashTypeIterator *hi, int what) {
+ robj *obj;
+ unsigned char *v = NULL;
+ unsigned int vlen = 0;
+ int encoding = hashTypeCurrent(hi,what,&obj,&v,&vlen);
+
+ if (encoding == REDIS_ENCODING_HT) {
+ incrRefCount(obj);
+ return obj;
+ } else {
+ return createStringObject((char*)v,vlen);
}
- return o;
}
robj *hashTypeLookupWriteOrCreate(redisClient *c, robj *key) {
robj *o;
if ((o = hashTypeLookupWriteOrCreate(c,c->argv[1])) == NULL) return;
- c->argv[3] = tryObjectEncoding(c->argv[3]);
hashTypeTryConversion(o,c->argv,2,3);
hashTypeTryObjectEncoding(o,&c->argv[2], &c->argv[3]);
update = hashTypeSet(o,c->argv[2],c->argv[3]);
void hsetnxCommand(redisClient *c) {
robj *o;
if ((o = hashTypeLookupWriteOrCreate(c,c->argv[1])) == NULL) return;
- c->argv[3] = tryObjectEncoding(c->argv[3]);
hashTypeTryConversion(o,c->argv,2,3);
if (hashTypeExists(o, c->argv[2])) {
}
if ((o = hashTypeLookupWriteOrCreate(c,c->argv[1])) == NULL) return;
- c->argv[c->argc-1] = tryObjectEncoding(c->argv[c->argc-1]);
hashTypeTryConversion(o,c->argv,2,c->argc-1);
for (i = 2; i < c->argc; i += 2) {
hashTypeTryObjectEncoding(o,&c->argv[i], &c->argv[i+1]);
if (getLongLongFromObjectOrReply(c,c->argv[3],&incr,NULL) != REDIS_OK) return;
if ((o = hashTypeLookupWriteOrCreate(c,c->argv[1])) == NULL) return;
- if ((current = hashTypeGet(o,c->argv[2])) != NULL) {
+ if ((current = hashTypeGetObject(o,c->argv[2])) != NULL) {
if (getLongLongFromObjectOrReply(c,current,&value,
"hash value is not an integer") != REDIS_OK) {
decrRefCount(current);
void hgetCommand(redisClient *c) {
robj *o, *value;
+ unsigned char *v;
+ unsigned int vlen;
+ int encoding;
+
if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.nullbulk)) == NULL ||
checkType(c,o,REDIS_HASH)) return;
- c->argv[2] = tryObjectEncoding(c->argv[2]);
- if ((value = hashTypeGet(o,c->argv[2])) != NULL) {
- addReplyBulk(c,value);
- decrRefCount(value);
+ if ((encoding = hashTypeGet(o,c->argv[2],&value,&v,&vlen)) != -1) {
+ if (encoding == REDIS_ENCODING_HT)
+ addReplyBulk(c,value);
+ else
+ addReplyBulkCBuffer(c,v,vlen);
} else {
addReply(c,shared.nullbulk);
}
}
void hmgetCommand(redisClient *c) {
- int i;
+ int i, encoding;
robj *o, *value;
+ unsigned char *v;
+ unsigned int vlen;
+
o = lookupKeyRead(c->db,c->argv[1]);
if (o != NULL && o->type != REDIS_HASH) {
addReply(c,shared.wrongtypeerr);
+ return;
}
/* Note the check for o != NULL happens inside the loop. This is
* done because objects that cannot be found are considered to be
* an empty hash. The reply should then be a series of NULLs. */
addReplyMultiBulkLen(c,c->argc-2);
- c->argv[c->argc-1] = tryObjectEncoding(c->argv[c->argc-1]);
for (i = 2; i < c->argc; i++) {
- if (o != NULL && (value = hashTypeGet(o,c->argv[i])) != NULL) {
- addReplyBulk(c,value);
- decrRefCount(value);
+ if (o != NULL &&
+ (encoding = hashTypeGet(o,c->argv[i],&value,&v,&vlen)) != -1) {
+ if (encoding == REDIS_ENCODING_HT)
+ addReplyBulk(c,value);
+ else
+ addReplyBulkCBuffer(c,v,vlen);
} else {
addReply(c,shared.nullbulk);
}
if ((o = lookupKeyWriteOrReply(c,c->argv[1],shared.czero)) == NULL ||
checkType(c,o,REDIS_HASH)) return;
- c->argv[2] = tryObjectEncoding(c->argv[2]);
if (hashTypeDelete(o,c->argv[2])) {
if (hashTypeLength(o) == 0) dbDelete(c->db,c->argv[1]);
addReply(c,shared.cone);
}
void genericHgetallCommand(redisClient *c, int flags) {
- robj *o, *obj;
+ robj *o;
unsigned long count = 0;
hashTypeIterator *hi;
void *replylen = NULL;
replylen = addDeferredMultiBulkLength(c);
hi = hashTypeInitIterator(o);
while (hashTypeNext(hi) != REDIS_ERR) {
+ robj *obj;
+ unsigned char *v = NULL;
+ unsigned int vlen = 0;
+ int encoding;
+
if (flags & REDIS_HASH_KEY) {
- obj = hashTypeCurrent(hi,REDIS_HASH_KEY);
- addReplyBulk(c,obj);
- decrRefCount(obj);
+ encoding = hashTypeCurrent(hi,REDIS_HASH_KEY,&obj,&v,&vlen);
+ if (encoding == REDIS_ENCODING_HT)
+ addReplyBulk(c,obj);
+ else
+ addReplyBulkCBuffer(c,v,vlen);
count++;
}
if (flags & REDIS_HASH_VALUE) {
- obj = hashTypeCurrent(hi,REDIS_HASH_VALUE);
- addReplyBulk(c,obj);
- decrRefCount(obj);
+ encoding = hashTypeCurrent(hi,REDIS_HASH_VALUE,&obj,&v,&vlen);
+ if (encoding == REDIS_ENCODING_HT)
+ addReplyBulk(c,obj);
+ else
+ addReplyBulkCBuffer(c,v,vlen);
count++;
}
}
if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.czero)) == NULL ||
checkType(c,o,REDIS_HASH)) return;
- c->argv[2] = tryObjectEncoding(c->argv[2]);
addReply(c, hashTypeExists(o,c->argv[2]) ? shared.cone : shared.czero);
}
projects / redis.git / blobdiff