Function lmoveGenericCommand

src/t_list.cpp:781–822

}

void lmoveGenericCommand(client *c, int wherefrom, int whereto) {
    robj *sobj, *value;
    if ((sobj = lookupKeyWriteOrReply(c,c->argv[1],shared.null[c->resp]))
        == NULL || checkType(c,sobj,OBJ_LIST)) return;

    if (listTypeLength(sobj) == 0) {
        /* This may only happen after loading very old RDB files. Recent
         * versions of Redis delete keys of empty lists. */
        addReplyNull(c);
    } else {
        robj *dobj = lookupKeyWrite(c->db,c->argv[2]);
        robj *touchedkey = c->argv[1];

        if (checkType(c,dobj,OBJ_LIST)) return;
        value = listTypePop(sobj,wherefrom);
        serverAssert(value); /* assertion for valgrind (avoid NPD) */
        lmoveHandlePush(c,c->argv[2],dobj,value,whereto);

        /* listTypePop returns an object with its refcount incremented */
        decrRefCount(value);

        /* Delete the source list when it is empty */
        notifyKeyspaceEvent(NOTIFY_LIST,
                            wherefrom == LIST_HEAD ? "lpop" : "rpop",
                            touchedkey,
                            c->db->id);
        if (listTypeLength(sobj) == 0) {
            dbDelete(c->db,touchedkey);
            notifyKeyspaceEvent(NOTIFY_GENERIC,"del",
                                touchedkey,c->db->id);
        }
        signalModifiedKey(c,c->db,touchedkey);
        g_pserver->dirty++;
        if (c->cmd->proc == blmoveCommand) {
            rewriteClientCommandVector(c,5,shared.lmove,
                                       c->argv[1],c->argv[2],c->argv[3],c->argv[4]);
        } else if (c->cmd->proc == brpoplpushCommand) {
            rewriteClientCommandVector(c,3,shared.rpoplpush,
                                       c->argv[1],c->argv[2]);
        }
    }
}

/* LMOVE <source> <destination> (LEFT|RIGHT) (LEFT|RIGHT) */
void lmoveCommand(client *c) {