Merge pull request #321 from mkwiatkowski/ticket227

[redis.git] / src / sort.c

diff --git a/src/sort.c b/src/sort.c
index aa1ce929399dc64bfdbcccda95f1db3ae1b2c9c6..038aec27afbbb3b9f233cf8c0967734a6d71a1c2 100644 (file)
--- a/src/sort.c
+++ b/src/sort.c
@@ -76,7 +76,7 @@ robj *lookupKeyByPattern(redisDb *db, robj *pattern, robj *subst) {
         /* Retrieve value from hash by the field name. This operation
          * already increases the refcount of the returned object. */
         initStaticStringObject(fieldobj,((char*)&fieldname)+(sizeof(struct sdshdr)));
-        o = hashTypeGet(o, &fieldobj);
+        o = hashTypeGetObject(o, &fieldobj);
     } else {
         if (o->type != REDIS_STRING) return NULL;
 
@@ -133,7 +133,7 @@ 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 */
     robj *sortval, *sortby = NULL, *storekey = NULL;
@@ -141,11 +141,7 @@ void sortCommand(redisClient *c) {
 
     /* 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 +157,10 @@ 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 +172,8 @@ 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 +198,10 @@ void sortCommand(redisClient *c) {
         j++;
     }
 
+    /* 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;
@@ -222,7 +225,7 @@ void sortCommand(redisClient *c) {
     } else if (sortval->type == REDIS_SET) {
         setTypeIterator *si = setTypeInitIterator(sortval);
         robj *ele;
-        while((ele = setTypeNext(si)) != NULL) {
+        while((ele = setTypeNextObject(si)) != NULL) {
             vector[j].obj = ele;
             vector[j].u.score = 0;
             vector[j].u.cmpobj = NULL;
@@ -235,7 +238,7 @@ 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 +247,7 @@ 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) {
@@ -270,7 +273,7 @@ void sortCommand(redisClient *c) {
                      * far. We can just cast it */
                     vector[j].u.score = (long)byval->ptr;
                 } else {
-                    redisAssert(1 != 1);
+                    redisAssertWithInfo(c,sortval,1 != 1);
                 }
             }
 
@@ -307,7 +310,7 @@ void sortCommand(redisClient *c) {
     outputlen = getop ? getop*(end-start+1) : end-start+1;
     if (storekey == NULL) {
         /* STORE option not specified, sent the sorting result to client */
-        addReplySds(c,sdscatprintf(sdsempty(),"*%d\r\n",outputlen));
+        addReplyMultiBulkLen(c,outputlen);
         for (j = start; j <= end; j++) {
             listNode *ln;
             listIter li;
@@ -327,7 +330,8 @@ 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);
                 }
             }
         }
@@ -357,19 +361,21 @@ 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;
-        touchWatchedKey(c->db,storekey);
-        addReplySds(c,sdscatprintf(sdsempty(),":%d\r\n",outputlen));
+        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);
     }
 
     /* Cleanup */