Refresh iforumpermission cache

[Jawelin]

Hi.
I tried to retrieve each usergroup permission on a given forum using the getpermission(forumid,0,groupid) function.
(it would be too complex doing that uprising the inheritance at database level ... as I tried to do days ago... :hurt: )

But noticed, cycling by the usergroup, a strange behavior based upon the order I tested the groups.
Analyzing the code, I realized there's a kind of cache of permission stored each time in global environment.

So, for example, if I test first usergroups 6 and 5, I get they CAN access to some forum. If I test them later, after some other groups, I get they CAN'T do the same access to the same forum.

Question is simple: how could I bypass this 'cache-due' strange and unpredictable behavior ?

Thank you very much.
Hope someone could give an answer.
Thanks

[Admin]

Stick:

unset($permscache, $usergroupcache);

Before calling getpermissions().

[Jawelin]

Thanks. It seems working on cleaning cache... At least, when I
change the order of groups I call the function for, I always get
the same results...

But they are unexpected, mostly for usergroups 5 and 6 !!!

I wrote this function (used a function to avoid some side effect
coming from global variables not explicitly declared):

PHP Code:

function testugperm($forum2test=9) {
    global $DB_site;

    $usergroups=$DB_site->query("SELECT usergroupid,title FROM usergroup ORDER BY usergroupid");

    echo "<p><pre>";
    while ($usergroup=$DB_site->fetch_array($usergroups)) {

        unset($permscache, $usergroupcache);
        $perms=getpermissions($forum2test,0,$usergroup[usergroupid]);

        if ($perms[canview])
            echo "<br>Forum <b>$forum2test</b> <b> can </b> be accessed by usergroup $usergroup[usergroupid] ($usergroup[title])";
        else
            echo "<br>Forum <b>$forum2test</b> <b>can't</b> be accessed by usergroup $usergroup[usergroupid] ($usergroup[title])";
    }
    echo "</pre></p>";
} 


but - even on public forums or private without specific access
masks - I see Admin & Supermods can't access them.

Besides, I think there should be some cache interference yet, as -
for example - if I test permissions by users with

PHP Code:

        unset($permscache, $usergroupcache);
        $perms=getpermissions($forum2test,$userid); 


for first 20 users, when the cycle passes from a group to another,
I see the new group couldn't access that forum ...
Instead, it can !

Even, i tried to unset the corresponding GLOBALS[] array
variables, as I'm within a function...
But results are the same.

Any idea ?

Thank you very much.

[Admin]

You need [minicode]global $permscache, $usergroupcache;[/minicode] in the function.

[Jawelin]

Btw, OUTSIDE the function,
getpermission($forumid,$userid) doesn't work even on first 20 users. I get 'canview' access only for Admins...
When the counter switches to Supermods, I get a "CAN'T" ...

If I reverse the sort (counting users from 20 to 1), I get userids 6-8 (supermods) can access... Admins can't .... :eek

Thnx

[Jawelin]

For usergroup permissions (in particular for Mods & Supermods) the function behavior is unpredictable.
Where could I find into db such informations ?

Thanks.
Need help ....

[Jawelin]

FF, you're very avaricious when we're talking about enhanced MySQL DB queries ... aren't you ?

After all, you can do it... Don't ?

We have done so much, for so long, with so little, we are now qualified to do anything with nothing.

Thanks

[Jawelin]

Originally posted by FireFly
Stick:

unset($permscache, $usergroupcache);

Before calling getpermissions().

There's something not working. I can't manage to clean the
cache, even outside the function...

If want, please try to upload this code to the admin/ directory
and try to execute vs. some private/protected forum (&forumid=xx) and with moderator or supermods usergroup (&grpid=y).
Even, a single user (&singleuser=uuu) can be specified.

PHP Code:

<?php
error_reporting(E_ALL);

require("./global.php");
cpheader();

echo "<p>Group <b>$grpid</b> crossed with Forum <b>$forumid</b></p>";

if (isset($forumid) and isset($grpid)) {

   $forum2test=$forumid;

    $usergroups=$DB_site->query("SELECT usergroupid,title FROM usergroup where usergroupid=$grpid");

    echo "<p>";
    while ($usergroup=$DB_site->fetch_array($usergroups)) {

        $id=$usergroup[usergroupid];

        $perms[$id]=getpermissions($forum2test,0,$id);

        $k=$perms[$id];
        if ($k[canview])
            echo "<br>Forum <b>$forum2test</b> <b> can </b> be accessed by usergroup $usergroup[usergroupid] ($usergroup[title])";
        else
            echo "<br>Forum <b>$forum2test</b> <b>can't</b> be accessed by usergroup $usergroup[usergroupid] ($usergroup[title])";
    }
    echo "</p>";


    $users=$DB_site->query("SELECT userid,username FROM user WHERE usergroupid=$grpid ORDER BY userid");

    echo "<p>";
    while ($user=$DB_site->fetch_array($users)) {

        unset($permscache, $usergroupcache);

        $id=$user[userid];

        $permuser[$id]=getpermissions($forum2test,$id);

        $k=$permuser[$id];
        if ($k[canview])
            echo "<br>Forum <b>$forum2test</b> <b> can </b> be accessed by user $user[userid] ($user[username])";
        else
            echo "<br>Forum <b>$forum2test</b> <b>can't</b> be accessed by user $user[userid] ($user[username])";
    }
    echo "</p>";


    // copy this code right before the first select...
    if (isset($singleuser)) {

        unset($permscache, $usergroupcache);

        $user[userid]=$singleuser;
        $permsingleuser=getpermissions($forum2test,$user[userid]);

        if ($permsingleuser[canview])
            echo "<br>Forum <b>$forum2test</b> <b> can </b> be accessed by user $user[userid]";
        else
            echo "<br>Forum <b>$forum2test</b> <b>can't</b> be accessed by user $user[userid]";

    }
    //  ... and if run with an user of the usergroup specified,
    //  you'll get different values for same instructions.

}

echo "<br><br><p>Performance stats: <b>".number_format($query_count)."</b> queries done in <b>".number_format($querytime,7)."</b> seconds</p>";

cpfooter();

?>

You can notice if run with a single user, that:
- if the user belongs to the specified group, permissions are
cached (i.e. wrong results if such user has single access mask
set)
- if not, permissions returned are true (reflecting the actual user ones)
- if you copy the same section of $singleuser also before the first
getpermissions(), you'll obtain true values ANY CASE, much
different from the same code at the end of the script.


It means that permissions are cached per usergroup and per
forum. And the unsets aren't enough ....

Thank you for attention.

Any idea ?
Bye

[Admin]

Ok, now I understand what is wrong. I'll try and fix it...

[Jawelin]

Originally posted by FireFly
Ok, now I understand what is wrong. I'll try and fix it...

Here I'm ! I rely on you...
Thanks.
Let me know.
Bye