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mod_load_limit.php

<?php

/*

Nanoweb Server Load Based Access Limiter Module
===============================================

Copyright (C) 2002-2003 Vincent Negrier aka. sIX <six@aegis-corp.org>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

*/


class mod_load_limit {

    function mod_load_limit(){

        $this->modtype="core_after_decode";
        $this->modname="access limit based on server load average";

    }

    function main(){

        global $conf, $pri_err, $pri_redir, $add_errmsg, $pri_redir_code;

            $maxload=(float)access_query("loadlimit", 0);
            $action=access_query("loadlimitaction", 0) or $action="error";
            
            $pl=@file("/proc/loadavg");
            $lg=explode(" ", $pl[0]);

            $loadavg=(float)$lg[0];
            
            if ($loadavg>$maxload) {

                  switch ($action) {
                  
                        case "redir":
                        $pri_redir=$this->nsv_str_replace(access_query("loadlimitredirect", 0));
                        $pri_redir_code=307;
                        break;
                        
                        case "error":
                        $err=access_query("loadlimiterror", 0) or $err=503;
                        $pri_err=$err;
                        $msg=access_query("loadlimiterrormessage", 0) or $msg="Server load is too high (<b>%CUR_LOAD/%MAX_LOAD</b>), try again in a few moments.";
                        $msg=str_replace("%CUR_LOAD", sprintf("%.1f", $loadavg), $msg);
                        $msg=str_replace("%MAX_LOAD", sprintf("%.1f", $maxload), $msg);
                        $add_errmsg=$msg."<br><br>";
                        break;

                  }

            }

    }

      function nsv_str_replace($s) {

            if (strpos($s, '%')!==false) if ($nsv=nw_server_vars(strpos($s, '%HTTP')!==false)) foreach ($nsv as $key=>$val) $s=str_replace('%'.$key, $val, $s);
            return($s);

      }

}

?>

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