The following module was proposed for inclusion in the Module List:
description: Compact and fast IP address range filter
userid: DAVEWEBB (Dave Webb)
chapterid: 23 (Miscellaneous_Modules)
NET::IPFilter Net::BitTorrent::Network::IPFilter Config::IPFilter
I was looking for an IP address filter I could plug into the perl
bittorrent server named bitflu.
Using the paranoid ipfilter.dat file, which has about 300k entries,
as the list of IP addresses and ranges to block, I found the
existing CPAN modules *very* slow to check whether an individual IP
address was in those ranges. They all operate by iterating over the
list of ranges, which means 300k tests per IP address.
Plus the Moose-based modules (Net::BitTorrent::Network::IPFilter,
Config::IPFilter) were using hundreds or thousands of MB of RAM to
hold the filter, which was too much for the machine I was intending
to run it on.
I remembered that there was a tree structure optimised for range
searches, and found Set::IntervalTree which is an xs-based module.
An IP filter wrapped around that is hundreds of times faster for
searches, and uses a fraction of the RAM than the existing modules.
Net::IPAddress::Filter seemed a meaningful namespace for this
purpose, as it's a stand-alone filter, not tied to any particular
purpose or data source.
enteredby: DAVEWEBB (Dave Webb)
enteredon: Thu Nov 8 13:58:58 2012 GMT
The resulting entry would be:
::Filter adpOd Compact and fast IP address range filter DAVEWEBB
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