[SR-Users] Htable simple CPS Limit

[Gareth Rylance]

Thanks for the feedback -- Here is my updated version.



modparam("htable", "htable",
"htable_source_group_rates_sec=>size=8;dbtable=htable_source_group_rates_sec;initval=0;autoexpire=300;")
modparam("htable", "htable",
"htable_source_group_rates_min=>size=8;dbtable=htable_source_group_rates_min;initval=0;autoexpire=1800;")
modparam("htable", "htable",
"htable_source_group_limits=>size=8;dbtable=htable_source_group_limits;initval=500;")



route[SOURCE_GROUP_LIMIT] {

if (is_method("INVITE")){
$var(rateHashSec) = (str)$var(srcgroup)+":sec:"+$timef(%Y/%m/%d_%H_%M_%S);
$var(rateHashMin) = (str)$var(srcgroup)+":min:"+$timef(%Y/%m/%d_%H_%M_00);
 $var(ratePerSec) =
$shtinc(htable_source_group_rates_sec=>$var(rateHashSec));
$var(ratePerMin) =
$shtinc(htable_source_group_rates_min=>$var(rateHashMin));
$var(limitPerSec) =  $sht(htable_source_group_limits=>$var(srcgroup));
 if($var(ratePerSec) >  $var(limitPerSec))
{
sl_send_reply("503", "$si over source Limit of $var(ratePerSec)) /
 $var(limitPerSec)");
exit;
}
}
}


On 12 September 2013 21:31, Daniel-Constantin Mierla <miconda at gmail.com>wrote:

>  Hello,
>
> nice approach and glad to see I could throw some seeds for new ideas out
> there!
>
> You should use $shtinc(...), like:
>
> $var(rps) = $shtinc(htable_source_group_rates=>$var(rateHashSec));
> $var(rpm) = $shtinc(htable_source_group_rates=>$var(rateHashMin));
>
> In this way you avoid races on increment operation done with '+'.
> Alternatives would be to use locks via cfgutils module.
>
> Then you can use $var(...) for test if you want to allow the requests that
> came below the limit, or the current value with $sht(...) to block if there
> were other requests coming meanwhile (after the increment).
>
> Cheers,
> Daniel
>
>
> On 9/12/13 9:21 PM, Gareth Rylance wrote:
>
>
>
>  I was inspired by Daniels ClueCon 2013 talk and have decide to try to
> add simple rate limiting using a HTable.
> $var(srcgroup) is an id that identifies the invites source/ I wish to
> limit invites from a given source.
>
>  $var(rateHashMin) was added just to allow simple monitoring.
> I query the table via XML-RPC to get an idea of current load.
> I think it would be better to add it to a seperate table and then I could
> increase the exprires time to capture more of the course grain points.
>
>
>
>  I am interested in any comments.
>
>
>  ----------------------
>  modparam("htable", "htable",
> "htable_source_group_rates=>size=8;dbtable=htable_source_group_rates;initval=0;autoexpire=300;")
> modparam("htable", "htable",
> "htable_source_group_limits=>size=8;dbtable=htable_source_group_limits;initval=500;")
>  ----------------------
>  ----------------------
>  route[SOURCE_GROUP_LIMIT] {
>
>  if (is_method("INVITE")){
>  $var(rateHashSec) =
> (str)$var(srcgroup)+":sec:"+$timef(%Y/%m/%d_%H_%M_%S);
>  $var(rateHashMin) =
> (str)$var(srcgroup)+":min:"+$timef(%Y/%m/%d_%H_%M_00);
>    $sht(htable_source_group_rates=>$var(rateHashSec)) =
> $sht(htable_source_group_rates=>$var(rateHashSec)) + 1;
>  $sht(htable_source_group_rates=>$var(rateHashMin)) =
> $sht(htable_source_group_rates=>$var(rateHashMin)) + 1;
>   if($sht(htable_source_group_rates=>$var(rateHashSec)) >
> $sht(htable_source_group_limits=>$var(srcgroup)))
>  {
>  sl_send_reply("503", "$si over source Limit of
> $sht(htable_source_group_rates=>$var(rateHashSec)) /
>  $sht(htable_source_group_limits=>$var(srcgroup)");
>  exit;
>  }
>  }
> }
> ----------------------
>
>
>
>  Thanks Gareth
>
>
> _______________________________________________
> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing listsr-users at lists.sip-router.orghttp://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>
>
> --
> Daniel-Constantin Mierla - http://www.asipto.comhttp://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
> Kamailio Advanced Trainings - Berlin, Oct 21-24; Miami, Nov 11-13, 2013
>   - more details about Kamailio trainings at http://www.asipto.com -
>
>
> _______________________________________________
> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
> sr-users at lists.sip-router.org
> http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.sip-router.org/pipermail/sr-users/attachments/20130913/d63607af/attachment.html>