X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/23c64fe50ddbc01f825ebe64f1a8b5f14c584327..a3309139992de03f3e68ec648db188c1c43057a0:/src/t_set.c

diff --git a/src/t_set.c b/src/t_set.c
index 97fc5bf4..be083c8b 100644
--- a/src/t_set.c
+++ b/src/t_set.c
@@ -8,7 +8,7 @@
  * an integer-encodable value, an intset will be returned. Otherwise a regular
  * hash table. */
 robj *setTypeCreate(robj *value) {
-    if (getLongLongFromObject(value,NULL) == REDIS_OK)
+    if (isObjectRepresentableAsLongLong(value,NULL) == REDIS_OK)
         return createIntsetObject();
     return createSetObject();
 }
@@ -21,7 +21,7 @@ int setTypeAdd(robj *subject, robj *value) {
             return 1;
         }
     } else if (subject->encoding == REDIS_ENCODING_INTSET) {
-        if (getLongLongFromObject(value,&llval) == REDIS_OK) {
+        if (isObjectRepresentableAsLongLong(value,&llval) == REDIS_OK) {
             uint8_t success = 0;
             subject->ptr = intsetAdd(subject->ptr,llval,&success);
             if (success) {
@@ -47,17 +47,17 @@ int setTypeAdd(robj *subject, robj *value) {
     return 0;
 }
 
-int setTypeRemove(robj *subject, robj *value) {
+int setTypeRemove(robj *setobj, robj *value) {
     long long llval;
-    if (subject->encoding == REDIS_ENCODING_HT) {
-        if (dictDelete(subject->ptr,value) == DICT_OK) {
-            if (htNeedsResize(subject->ptr)) dictResize(subject->ptr);
+    if (setobj->encoding == REDIS_ENCODING_HT) {
+        if (dictDelete(setobj->ptr,value) == DICT_OK) {
+            if (htNeedsResize(setobj->ptr)) dictResize(setobj->ptr);
             return 1;
         }
-    } else if (subject->encoding == REDIS_ENCODING_INTSET) {
-        if (getLongLongFromObject(value,&llval) == REDIS_OK) {
-            uint8_t success;
-            subject->ptr = intsetRemove(subject->ptr,llval,&success);
+    } else if (setobj->encoding == REDIS_ENCODING_INTSET) {
+        if (isObjectRepresentableAsLongLong(value,&llval) == REDIS_OK) {
+            int success;
+            setobj->ptr = intsetRemove(setobj->ptr,llval,&success);
             if (success) return 1;
         }
     } else {
@@ -71,7 +71,7 @@ int setTypeIsMember(robj *subject, robj *value) {
     if (subject->encoding == REDIS_ENCODING_HT) {
         return dictFind((dict*)subject->ptr,value) != NULL;
     } else if (subject->encoding == REDIS_ENCODING_INTSET) {
-        if (getLongLongFromObject(value,&llval) == REDIS_OK) {
+        if (isObjectRepresentableAsLongLong(value,&llval) == REDIS_OK) {
             return intsetFind((intset*)subject->ptr,llval);
         }
     } else {
@@ -101,40 +101,77 @@ void setTypeReleaseIterator(setTypeIterator *si) {
 }
 
 /* Move to the next entry in the set. Returns the object at the current
- * position, or NULL when the end is reached. This object will have its
- * refcount incremented, so the caller needs to take care of this. */
-robj *setTypeNext(setTypeIterator *si) {
-    robj *ret = NULL;
+ * position.
+ *
+ * Since set elements can be internally be stored as redis objects or
+ * simple arrays of integers, setTypeNext returns the encoding of the
+ * set object you are iterating, and will populate the appropriate pointer
+ * (eobj) or (llobj) accordingly.
+ *
+ * When there are no longer elements -1 is returned.
+ * Returned objects ref count is not incremented, so this function is
+ * copy on write friendly. */
+int setTypeNext(setTypeIterator *si, robj **objele, int64_t *llele) {
     if (si->encoding == REDIS_ENCODING_HT) {
         dictEntry *de = dictNext(si->di);
-        if (de != NULL) {
-            ret = dictGetEntryKey(de);
-            incrRefCount(ret);
-        }
+        if (de == NULL) return -1;
+        *objele = dictGetEntryKey(de);
     } else if (si->encoding == REDIS_ENCODING_INTSET) {
-        int64_t llval;
-        if (intsetGet(si->subject->ptr,si->ii++,&llval))
-            ret = createStringObjectFromLongLong(llval);
+        if (!intsetGet(si->subject->ptr,si->ii++,llele))
+            return -1;
     }
-    return ret;
+    return si->encoding;
 }
 
+/* The not copy on write friendly version but easy to use version
+ * of setTypeNext() is setTypeNextObject(), returning new objects
+ * or incrementing the ref count of returned objects. So if you don't
+ * retain a pointer to this object you should call decrRefCount() against it.
+ *
+ * This function is the way to go for write operations where COW is not
+ * an issue as the result will be anyway of incrementing the ref count. */
+robj *setTypeNextObject(setTypeIterator *si) {
+    int64_t intele;
+    robj *objele;
+    int encoding;
+
+    encoding = setTypeNext(si,&objele,&intele);
+    switch(encoding) {
+        case -1:    return NULL;
+        case REDIS_ENCODING_INTSET:
+            return createStringObjectFromLongLong(intele);
+        case REDIS_ENCODING_HT:
+            incrRefCount(objele);
+            return objele;
+        default:
+            redisPanic("Unsupported encoding");
+    }
+    return NULL; /* just to suppress warnings */
+}
 
-/* Return random element from set. The returned object will always have
- * an incremented refcount. */
-robj *setTypeRandomElement(robj *subject) {
-    robj *ret = NULL;
-    if (subject->encoding == REDIS_ENCODING_HT) {
-        dictEntry *de = dictGetRandomKey(subject->ptr);
-        ret = dictGetEntryKey(de);
-        incrRefCount(ret);
-    } else if (subject->encoding == REDIS_ENCODING_INTSET) {
-        long long llval = intsetRandom(subject->ptr);
-        ret = createStringObjectFromLongLong(llval);
+/* Return random element from a non empty set.
+ * The returned element can be a int64_t value if the set is encoded
+ * as an "intset" blob of integers, or a redis object if the set
+ * is a regular set.
+ *
+ * The caller provides both pointers to be populated with the right
+ * object. The return value of the function is the object->encoding
+ * field of the object and is used by the caller to check if the
+ * int64_t pointer or the redis object pointere was populated.
+ *
+ * When an object is returned (the set was a real set) the ref count
+ * of the object is not incremented so this function can be considered
+ * copy on write friendly. */
+int setTypeRandomElement(robj *setobj, robj **objele, int64_t *llele) {
+    if (setobj->encoding == REDIS_ENCODING_HT) {
+        dictEntry *de = dictGetRandomKey(setobj->ptr);
+        *objele = dictGetEntryKey(de);
+    } else if (setobj->encoding == REDIS_ENCODING_INTSET) {
+        *llele = intsetRandom(setobj->ptr);
     } else {
         redisPanic("Unknown set encoding");
     }
-    return ret;
+    return setobj->encoding;
 }
 
 unsigned long setTypeSize(robj *subject) {
@@ -150,25 +187,30 @@ unsigned long setTypeSize(robj *subject) {
 /* Convert the set to specified encoding. The resulting dict (when converting
  * to a hashtable) is presized to hold the number of elements in the original
  * set. */
-void setTypeConvert(robj *subject, int enc) {
+void setTypeConvert(robj *setobj, int enc) {
     setTypeIterator *si;
-    robj *element;
-    redisAssert(subject->type == REDIS_SET);
+    redisAssert(setobj->type == REDIS_SET &&
+                setobj->encoding == REDIS_ENCODING_INTSET);
 
     if (enc == REDIS_ENCODING_HT) {
+        int64_t intele;
         dict *d = dictCreate(&setDictType,NULL);
+        robj *element;
+
         /* Presize the dict to avoid rehashing */
-        dictExpand(d,intsetLen(subject->ptr));
+        dictExpand(d,intsetLen(setobj->ptr));
 
-        /* setTypeGet returns a robj with incremented refcount */
-        si = setTypeInitIterator(subject);
-        while ((element = setTypeNext(si)) != NULL)
+        /* To add the elements we extract integers and create redis objects */
+        si = setTypeInitIterator(setobj);
+        while (setTypeNext(si,NULL,&intele) != -1) {
+            element = createStringObjectFromLongLong(intele);
             redisAssert(dictAdd(d,element,NULL) == DICT_OK);
+        }
         setTypeReleaseIterator(si);
 
-        subject->encoding = REDIS_ENCODING_HT;
-        zfree(subject->ptr);
-        subject->ptr = d;
+        setobj->encoding = REDIS_ENCODING_HT;
+        zfree(setobj->ptr);
+        setobj->ptr = d;
     } else {
         redisPanic("Unsupported set conversion");
     }
@@ -176,6 +218,7 @@ void setTypeConvert(robj *subject, int enc) {
 
 void saddCommand(redisClient *c) {
     robj *set;
+    int j, added = 0;
 
     set = lookupKeyWrite(c->db,c->argv[1]);
     if (set == NULL) {
@@ -187,36 +230,41 @@ void saddCommand(redisClient *c) {
             return;
         }
     }
-    if (setTypeAdd(set,c->argv[2])) {
-        touchWatchedKey(c->db,c->argv[1]);
-        server.dirty++;
-        addReply(c,shared.cone);
-    } else {
-        addReply(c,shared.czero);
+
+    for (j = 2; j < c->argc; j++) {
+        c->argv[j] = tryObjectEncoding(c->argv[j]);
+        if (setTypeAdd(set,c->argv[j])) added++;
     }
+    if (added) signalModifiedKey(c->db,c->argv[1]);
+    server.dirty += added;
+    addReplyLongLong(c,added);
 }
 
 void sremCommand(redisClient *c) {
     robj *set;
+    int j, deleted = 0;
 
     if ((set = lookupKeyWriteOrReply(c,c->argv[1],shared.czero)) == NULL ||
         checkType(c,set,REDIS_SET)) return;
 
-    if (setTypeRemove(set,c->argv[2])) {
-        if (setTypeSize(set) == 0) dbDelete(c->db,c->argv[1]);
-        touchWatchedKey(c->db,c->argv[1]);
-        server.dirty++;
-        addReply(c,shared.cone);
-    } else {
-        addReply(c,shared.czero);
+    for (j = 2; j < c->argc; j++) {
+        if (setTypeRemove(set,c->argv[j])) {
+            if (setTypeSize(set) == 0) dbDelete(c->db,c->argv[1]);
+            deleted++;
+        }
+    }
+    if (deleted) {
+        signalModifiedKey(c->db,c->argv[1]);
+        server.dirty += deleted;
     }
+    addReplyLongLong(c,deleted);
 }
 
 void smoveCommand(redisClient *c) {
     robj *srcset, *dstset, *ele;
     srcset = lookupKeyWrite(c->db,c->argv[1]);
     dstset = lookupKeyWrite(c->db,c->argv[2]);
-    ele = c->argv[3];
+    ele = c->argv[3] = tryObjectEncoding(c->argv[3]);
 
     /* If the source key does not exist return 0 */
     if (srcset == NULL) {
@@ -243,8 +291,8 @@ void smoveCommand(redisClient *c) {
 
     /* Remove the src set from the database when empty */
     if (setTypeSize(srcset) == 0) dbDelete(c->db,c->argv[1]);
-    touchWatchedKey(c->db,c->argv[1]);
-    touchWatchedKey(c->db,c->argv[2]);
+    signalModifiedKey(c->db,c->argv[1]);
+    signalModifiedKey(c->db,c->argv[2]);
     server.dirty++;
 
     /* Create the destination set when it doesn't exist */
@@ -264,6 +312,7 @@ void sismemberCommand(redisClient *c) {
     if ((set = lookupKeyReadOrReply(c,c->argv[1],shared.czero)) == NULL ||
         checkType(c,set,REDIS_SET)) return;
 
+    c->argv[2] = tryObjectEncoding(c->argv[2]);
     if (setTypeIsMember(set,c->argv[2]))
         addReply(c,shared.cone);
     else
@@ -276,40 +325,56 @@ void scardCommand(redisClient *c) {
     if ((o = lookupKeyReadOrReply(c,c->argv[1],shared.czero)) == NULL ||
         checkType(c,o,REDIS_SET)) return;
 
-    addReplyUlong(c,setTypeSize(o));
+    addReplyLongLong(c,setTypeSize(o));
 }
 
 void spopCommand(redisClient *c) {
     robj *set, *ele;
+    int64_t llele;
+    int encoding;
 
     if ((set = lookupKeyWriteOrReply(c,c->argv[1],shared.nullbulk)) == NULL ||
         checkType(c,set,REDIS_SET)) return;
 
-    ele = setTypeRandomElement(set);
-    if (ele == NULL) {
-        addReply(c,shared.nullbulk);
+    encoding = setTypeRandomElement(set,&ele,&llele);
+    if (encoding == REDIS_ENCODING_INTSET) {
+        ele = createStringObjectFromLongLong(llele);
+        set->ptr = intsetRemove(set->ptr,llele,NULL);
     } else {
+        incrRefCount(ele);
         setTypeRemove(set,ele);
-        addReplyBulk(c,ele);
-        decrRefCount(ele);
-        if (setTypeSize(set) == 0) dbDelete(c->db,c->argv[1]);
-        touchWatchedKey(c->db,c->argv[1]);
-        server.dirty++;
     }
+
+    /* Change argv to replicate as SREM */
+    c->argc = 3;
+    c->argv = zrealloc(c->argv,sizeof(robj*)*(c->argc));
+
+    /* Overwrite SREM with SPOP (same length) */
+    redisAssert(sdslen(c->argv[0]->ptr) == 4);
+    memcpy(c->argv[0]->ptr, "SREM", 4);
+
+    /* Popped element already has incremented refcount */
+    c->argv[2] = ele;
+
+    addReplyBulk(c,ele);
+    if (setTypeSize(set) == 0) dbDelete(c->db,c->argv[1]);
+    signalModifiedKey(c->db,c->argv[1]);
+    server.dirty++;
 }
 
 void srandmemberCommand(redisClient *c) {
     robj *set, *ele;
+    int64_t llele;
+    int encoding;
 
     if ((set = lookupKeyReadOrReply(c,c->argv[1],shared.nullbulk)) == NULL ||
         checkType(c,set,REDIS_SET)) return;
 
-    ele = setTypeRandomElement(set);
-    if (ele == NULL) {
-        addReply(c,shared.nullbulk);
+    encoding = setTypeRandomElement(set,&ele,&llele);
+    if (encoding == REDIS_ENCODING_INTSET) {
+        addReplyBulkLongLong(c,llele);
     } else {
         addReplyBulk(c,ele);
-        decrRefCount(ele);
     }
 }
 
@@ -320,8 +385,11 @@ int qsortCompareSetsByCardinality(const void *s1, const void *s2) {
 void sinterGenericCommand(redisClient *c, robj **setkeys, unsigned long setnum, robj *dstkey) {
     robj **sets = zmalloc(sizeof(robj*)*setnum);
     setTypeIterator *si;
-    robj *ele, *lenobj = NULL, *dstset = NULL;
+    robj *eleobj, *dstset = NULL;
+    int64_t intobj;
+    void *replylen = NULL;
     unsigned long j, cardinality = 0;
+    int encoding;
 
     for (j = 0; j < setnum; j++) {
         robj *setobj = dstkey ?
@@ -331,7 +399,7 @@ void sinterGenericCommand(redisClient *c, robj **setkeys, unsigned long setnum,
             zfree(sets);
             if (dstkey) {
                 if (dbDelete(c->db,dstkey)) {
-                    touchWatchedKey(c->db,dstkey);
+                    signalModifiedKey(c->db,dstkey);
                     server.dirty++;
                 }
                 addReply(c,shared.czero);
@@ -356,9 +424,7 @@ void sinterGenericCommand(redisClient *c, robj **setkeys, unsigned long setnum,
      * to the output list and save the pointer to later modify it with the
      * right length */
     if (!dstkey) {
-        lenobj = createObject(REDIS_STRING,NULL);
-        addReply(c,lenobj);
-        decrRefCount(lenobj);
+        replylen = addDeferredMultiBulkLength(c);
     } else {
         /* If we have a target key where to store the resulting set
          * create this key with an empty set inside */
@@ -369,20 +435,61 @@ void sinterGenericCommand(redisClient *c, robj **setkeys, unsigned long setnum,
      * the element against all the other sets, if at least one set does
      * not include the element it is discarded */
     si = setTypeInitIterator(sets[0]);
-    while((ele = setTypeNext(si)) != NULL) {
-        for (j = 1; j < setnum; j++)
-            if (!setTypeIsMember(sets[j],ele)) break;
+    while((encoding = setTypeNext(si,&eleobj,&intobj)) != -1) {
+        for (j = 1; j < setnum; j++) {
+            if (sets[j] == sets[0]) continue;
+            if (encoding == REDIS_ENCODING_INTSET) {
+                /* intset with intset is simple... and fast */
+                if (sets[j]->encoding == REDIS_ENCODING_INTSET &&
+                    !intsetFind((intset*)sets[j]->ptr,intobj))
+                {
+                    break;
+                /* in order to compare an integer with an object we
+                 * have to use the generic function, creating an object
+                 * for this */
+                } else if (sets[j]->encoding == REDIS_ENCODING_HT) {
+                    eleobj = createStringObjectFromLongLong(intobj);
+                    if (!setTypeIsMember(sets[j],eleobj)) {
+                        decrRefCount(eleobj);
+                        break;
+                    }
+                    decrRefCount(eleobj);
+                }
+            } else if (encoding == REDIS_ENCODING_HT) {
+                /* Optimization... if the source object is integer
+                 * encoded AND the target set is an intset, we can get
+                 * a much faster path. */
+                if (eleobj->encoding == REDIS_ENCODING_INT &&
+                    sets[j]->encoding == REDIS_ENCODING_INTSET &&
+                    !intsetFind((intset*)sets[j]->ptr,(long)eleobj->ptr))
+                {
+                    break;
+                /* else... object to object check is easy as we use the
+                 * type agnostic API here. */
+                } else if (!setTypeIsMember(sets[j],eleobj)) {
+                    break;
+                }
+            }
+        }
 
         /* Only take action when all sets contain the member */
         if (j == setnum) {
             if (!dstkey) {
-                addReplyBulk(c,ele);
+                if (encoding == REDIS_ENCODING_HT)
+                    addReplyBulk(c,eleobj);
+                else
+                    addReplyBulkLongLong(c,intobj);
                 cardinality++;
             } else {
-                setTypeAdd(dstset,ele);
+                if (encoding == REDIS_ENCODING_INTSET) {
+                    eleobj = createStringObjectFromLongLong(intobj);
+                    setTypeAdd(dstset,eleobj);
+                    decrRefCount(eleobj);
+                } else {
+                    setTypeAdd(dstset,eleobj);
+                }
             }
         }
-        decrRefCount(ele);
     }
     setTypeReleaseIterator(si);
 
@@ -397,10 +504,10 @@ void sinterGenericCommand(redisClient *c, robj **setkeys, unsigned long setnum,
             decrRefCount(dstset);
             addReply(c,shared.czero);
         }
-        touchWatchedKey(c->db,dstkey);
+        signalModifiedKey(c->db,dstkey);
         server.dirty++;
     } else {
-        lenobj->ptr = sdscatprintf(sdsempty(),"*%lu\r\n",cardinality);
+        setDeferredMultiBulkLength(c,replylen,cardinality);
     }
     zfree(sets);
 }
@@ -450,7 +557,7 @@ void sunionDiffGenericCommand(redisClient *c, robj **setkeys, int setnum, robj *
         if (!sets[j]) continue; /* non existing keys are like empty sets */
 
         si = setTypeInitIterator(sets[j]);
-        while((ele = setTypeNext(si)) != NULL) {
+        while((ele = setTypeNextObject(si)) != NULL) {
             if (op == REDIS_OP_UNION || j == 0) {
                 if (setTypeAdd(dstset,ele)) {
                     cardinality++;
@@ -470,9 +577,9 @@ void sunionDiffGenericCommand(redisClient *c, robj **setkeys, int setnum, robj *
 
     /* Output the content of the resulting set, if not in STORE mode */
     if (!dstkey) {
-        addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",cardinality));
+        addReplyMultiBulkLen(c,cardinality);
         si = setTypeInitIterator(dstset);
-        while((ele = setTypeNext(si)) != NULL) {
+        while((ele = setTypeNextObject(si)) != NULL) {
             addReplyBulk(c,ele);
             decrRefCount(ele);
         }
@@ -489,7 +596,7 @@ void sunionDiffGenericCommand(redisClient *c, robj **setkeys, int setnum, robj *
             decrRefCount(dstset);
             addReply(c,shared.czero);
         }
-        touchWatchedKey(c->db,dstkey);
+        signalModifiedKey(c->db,dstkey);
         server.dirty++;
     }
     zfree(sets);