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.
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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