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