Merge pull request #707 from NanXiao/patch-1

[redis.git] / src / t_hash.c

diff --git a/src/t_hash.c b/src/t_hash.c
index a22de242990db7f95aa62f910fe5ef98ab4dce20..aa021b03814b60bd35a036c3a72877898b6e92f2 100644 (file)
--- a/src/t_hash.c
+++ b/src/t_hash.c
@@ -75,10 +75,7 @@ int hashTypeGetFromHashTable(robj *o, robj *field, robj **value) {
     redisAssert(o->encoding == REDIS_ENCODING_HT);
 
     de = dictFind(o->ptr, field);
-    if (de == NULL) {
-        return -1;
-    }
-
+    if (de == NULL) return -1;
     *value = dictGetVal(de);
     return 0;
 }
@@ -112,11 +109,9 @@ robj *hashTypeGetObject(robj *o, robj *field) {
             incrRefCount(aux);
             value = aux;
         }
-
     } else {
         redisPanic("Unknown hash encoding");
     }
-
     return value;
 }
 
@@ -128,26 +123,21 @@ int hashTypeExists(robj *o, robj *field) {
         unsigned int vlen = UINT_MAX;
         long long vll = LLONG_MAX;
 
-        if (hashTypeGetFromZiplist(o, field, &vstr, &vlen, &vll) == 0) {
-            return 1;
-        }
-
+        if (hashTypeGetFromZiplist(o, field, &vstr, &vlen, &vll) == 0) return 1;
     } else if (o->encoding == REDIS_ENCODING_HT) {
         robj *aux;
 
-        if (hashTypeGetFromHashTable(o, field, &aux) == 0) {
-            return 1;
-        }
-
+        if (hashTypeGetFromHashTable(o, field, &aux) == 0) return 1;
     } else {
         redisPanic("Unknown hash encoding");
     }
-
     return 0;
 }
 
 /* Add an element, discard the old if the key already exists.
- * Return 0 on insert and 1 on update. */
+ * Return 0 on insert and 1 on update.
+ * This function will take care of incrementing the reference count of the
+ * retained fields and value objects. */
 int hashTypeSet(robj *o, robj *field, robj *value) {
     int update = 0;
 
@@ -180,30 +170,23 @@ int hashTypeSet(robj *o, robj *field, robj *value) {
             zl = ziplistPush(zl, field->ptr, sdslen(field->ptr), ZIPLIST_TAIL);
             zl = ziplistPush(zl, value->ptr, sdslen(value->ptr), ZIPLIST_TAIL);
         }
-
         o->ptr = zl;
-
         decrRefCount(field);
         decrRefCount(value);
 
         /* Check if the ziplist needs to be converted to a hash table */
-        if (hashTypeLength(o) > server.hash_max_ziplist_entries) {
+        if (hashTypeLength(o) > server.hash_max_ziplist_entries)
             hashTypeConvert(o, REDIS_ENCODING_HT);
-        }
-
     } else if (o->encoding == REDIS_ENCODING_HT) {
         if (dictReplace(o->ptr, field, value)) { /* Insert */
             incrRefCount(field);
         } else { /* Update */
             update = 1;
         }
-
         incrRefCount(value);
-
     } else {
         redisPanic("Unknown hash encoding");
     }
-
     return update;
 }
 
@@ -306,10 +289,7 @@ int hashTypeNext(hashTypeIterator *hi) {
             redisAssert(vptr != NULL);
             fptr = ziplistNext(zl, vptr);
         }
-
-        if (fptr == NULL) {
-            return REDIS_ERR;
-        }
+        if (fptr == NULL) return REDIS_ERR;
 
         /* Grab pointer to the value (fptr points to the field) */
         vptr = ziplistNext(zl, fptr);
@@ -318,16 +298,11 @@ int hashTypeNext(hashTypeIterator *hi) {
         /* fptr, vptr now point to the first or next pair */
         hi->fptr = fptr;
         hi->vptr = vptr;
-
     } else if (hi->encoding == REDIS_ENCODING_HT) {
-        if ((hi->de = dictNext(hi->di)) == NULL) {
-            return REDIS_ERR;
-        }
-
+        if ((hi->de = dictNext(hi->di)) == NULL) return REDIS_ERR;
     } else {
         redisPanic("Unknown hash encoding");
     }
-
     return REDIS_OK;
 }
 
@@ -428,7 +403,11 @@ void hashTypeConvertZiplist(robj *o, int enc) {
             value = hashTypeCurrentObject(hi, REDIS_HASH_VALUE);
             value = tryObjectEncoding(value);
             ret = dictAdd(dict, field, value);
-            redisAssert(ret == DICT_OK);
+            if (ret != DICT_OK) {
+                redisLogHexDump(REDIS_WARNING,"ziplist with dup elements dump",
+                    o->ptr,ziplistBlobLen(o->ptr));
+                redisAssert(ret == DICT_OK);
+            }
         }
 
         hashTypeReleaseIterator(hi);
@@ -506,7 +485,7 @@ void hmsetCommand(redisClient *c) {
 }
 
 void hincrbyCommand(redisClient *c) {
-    long long value, incr;
+    long long value, incr, oldvalue;
     robj *o, *current, *new;
 
     if (getLongLongFromObjectOrReply(c,c->argv[3],&incr,NULL) != REDIS_OK) return;
@@ -522,6 +501,12 @@ void hincrbyCommand(redisClient *c) {
         value = 0;
     }
 
+    oldvalue = value;
+    if ((incr < 0 && oldvalue < 0 && incr < (LLONG_MIN-oldvalue)) ||
+        (incr > 0 && oldvalue > 0 && incr > (LLONG_MAX-oldvalue))) {
+        addReplyError(c,"increment or decrement would overflow");
+        return;
+    }
     value += incr;
     new = createStringObjectFromLongLong(value);
     hashTypeTryObjectEncoding(o,&c->argv[2],NULL);
@@ -534,7 +519,7 @@ void hincrbyCommand(redisClient *c) {
 
 void hincrbyfloatCommand(redisClient *c) {
     double long value, incr;
-    robj *o, *current, *new;
+    robj *o, *current, *new, *aux;
 
     if (getLongDoubleFromObjectOrReply(c,c->argv[3],&incr,NULL) != REDIS_OK) return;
     if ((o = hashTypeLookupWriteOrCreate(c,c->argv[1])) == NULL) return;
@@ -554,9 +539,17 @@ void hincrbyfloatCommand(redisClient *c) {
     hashTypeTryObjectEncoding(o,&c->argv[2],NULL);
     hashTypeSet(o,c->argv[2],new);
     addReplyBulk(c,new);
-    decrRefCount(new);
     signalModifiedKey(c->db,c->argv[1]);
     server.dirty++;
+
+    /* Always replicate HINCRBYFLOAT as an HSET command with the final value
+     * in order to make sure that differences in float pricision or formatting
+     * will not create differences in replicas or after an AOF restart. */
+    aux = createStringObject("HSET",4);
+    rewriteClientCommandArgument(c,0,aux);
+    decrRefCount(aux);
+    rewriteClientCommandArgument(c,3,new);
+    decrRefCount(new);
 }
 
 static void addHashFieldToReply(redisClient *c, robj *o, robj *field) {