Implement keydb.hrename command

Former-commit-id: 21d842b0b0d9a0da44e4618a2c1d4ac26553f17b

src/server.cpp

@@ -1042,6 +1042,10 @@ struct redisCommand redisCommandTable[] = {
     {"keydb.cron",cronCommand,-5,
      "write use-memory",
      0,NULL,1,1,1,0,0,0},
+
+    {"keydb.hrename", hrenameCommand, 4,
+     "write fast @hash",
+     0,NULL,0,0,0,0,0,0}
 };
 
 /*============================ Utility functions ============================ */

src/server.h

@@ -2966,6 +2966,7 @@ void xdelCommand(client *c);
 void xtrimCommand(client *c);
 void aclCommand(client *c);
 void replicaReplayCommand(client *c);
+void hrenameCommand(client *c);
 
 int FBrokenLinkToMaster();
 int FActiveMaster(client *c);

src/t_hash.cpp

@@ -832,3 +832,33 @@ void hscanCommand(client *c) {
         checkType(c,o,OBJ_HASH)) return;
     scanGenericCommand(c,o,cursor);
 }
+
+void hrenameCommand(client *c) {
+    robj *o = nullptr;
+    const unsigned char *vstr;
+    unsigned int vlen;
+    long long ll;
+
+    if ((o = lookupKeyWriteOrReply(c,c->argv[1],shared.null[c->resp])) == nullptr ||
+        checkType(c,o,OBJ_HASH)) return;
+
+    if (hashTypeGetValue(o, szFromObj(c->argv[2]), &vstr, &vlen, &ll) != C_OK)
+    {
+        addReplyError(c, "hash key doesn't exist");
+        return;
+    }
+
+    sds sdsT = nullptr;
+    if (vstr != nullptr)
+    {
+        sdsT = sdsnewlen(vstr, vlen);
+    }
+    else
+    {
+        sdsT = sdsfromlonglong(ll);
+    }
+
+    hashTypeDelete(o, szFromObj(c->argv[2]));
+    hashTypeSet(o, szFromObj(c->argv[3]), sdsT, HASH_SET_TAKE_VALUE);
+    addReplyLongLong(c, 1);
+}