use Math::Trig qw(deg2rad pip2 great_circle_distance);
use JSON::XS;
use LWP::UserAgent;
-use XML::Writer;
use XML::TreeBuilder;
use YAML;
my $zone = shift @ARGV;
my $servers = YAML::LoadFile("src/${source}");
-foreach my $server (values %$servers)
+# Initialise server details
+while (my($name,$server) = each %$servers)
{
- $server->{status} = "down";
+ $server->{name} = $name;
+ $server->{bandwidth_limit} = $server->{bandwidth} * 1024 * 1024;
+ $server->{bandwidth_used} = 0;
+
+ if ($ENV{PINGDOM_USERNAME} && $ENV{PINGDOM_PASSWORD})
+ {
+ $server->{status} = "down";
+ }
+ else
+ {
+ $server->{status} = "up";
+ }
}
+# If pingdom support is enabled then check which servers are up
if ($ENV{PINGDOM_USERNAME} && $ENV{PINGDOM_PASSWORD})
{
my $ua = LWP::UserAgent->new;
}
my %countries = ();
+my @mappings = ();
+# Create a parser for the country database
my $countries = XML::TreeBuilder->new;
+# Parse the country database
$countries->parsefile("lib/countries.xml");
+# Load the per-country bandwidth details
+my $bandwidth = YAML::LoadFile("bandwidth/${source}.yml");
+
+# Fill in country table and work out which servers each can use
foreach my $country ($countries->look_down("_tag" => "country"))
{
my $code = $country->look_down("_tag" => "countryCode")->as_text;
my $name = $country->look_down("_tag" => "countryName")->as_text;
+ my $population = $country->look_down("_tag" => "population")->as_text;
+ my $bandwidth = $bandwidth->{$code} || 0;
my $continent = $country->look_down("_tag" => "continent")->as_text;
my $west = $country->look_down("_tag" => "west")->as_text;
my $north = $country->look_down("_tag" => "north")->as_text;
my $south = $country->look_down("_tag" => "south")->as_text;
my $lat = centre_lat( $south, $north );
my $lon = centre_lon( $west, $east );
- my @servers;
- foreach my $servername (keys %$servers)
+ $countries{$code} = {
+ code => $code, name => $name, continent => $continent,
+ bandwidth => $bandwidth, lat => $lat, lon => $lon
+ };
+
+ foreach my $server (values %$servers)
{
- my $server = $servers->{$servername};
my $match = match_country($server, $code, $continent);
- if ($match eq "preferred" || $match eq "allowed")
+ if ($server->{status} eq "up" && $match ne "denied")
{
my $priority = $match eq "preferred" ? 20 : 10;
my $distance = distance($lat, $lon, $server->{lat}, $server->{lon});
- $priority = $priority * 10 if $server->{status} eq "up";
+ push @mappings, {
+ country => $countries{$code}, server => $server,
+ priority => $priority, distance => $distance
+ };
+ }
+ }
+}
-# print STDERR "$servername is $match for $name with distance $distance\n";
+# Discard the parsed country database
+$countries->delete;
- push @servers, { name => $servername, priority => $priority, distance => $distance };
- }
+# Allocate each country to a server
+allocate_servers(\@mappings);
+
+# If we failed to allocate every country then loop, increasing
+# the bandwidth for each server by a little and retrying until
+# we manage to allocate everything
+while (grep { !exists($_->{server}) } values %countries)
+{
+ # Clear any existing mappings of countries to servers
+ foreach my $country (values %countries)
+ {
+ delete $country->{server};
}
- $countries{$code} = {
- code => $code, name => $name, continent => $continent,
- lat => $lat, lon => $lon, servers => \@servers
- };
+ # Reset bandwidth usage for servers and increase limits by 10%
+ foreach my $server (values %$servers)
+ {
+ $server->{bandwidth_used} = 0;
+ $server->{bandwidth_limit} = $server->{bandwidth_limit} * 1.1;
+ }
+
+ # Try the allocate again
+ allocate_servers(\@mappings);
}
-$countries->delete;
+# Create JSON collection object
+my @json;
+# Open output files
my $zonefile = IO::File->new("> data/${zone}") || die "$!";
-my $kmlfile = IO::File->new("> kml/${zone}.kml") || die "$!";
-my $kmlwriter = XML::Writer->new(OUTPUT => $kmlfile, ENCODING => 'utf-8');
-
-$kmlwriter->xmlDecl();
-$kmlwriter->startTag("kml", "xmlns" => "http://www.opengis.net/kml/2.2");
-$kmlwriter->startTag("Document");
+my $jsonfile = IO::File->new("> json/${zone}.json") || die "$!";
+# Output details for each country
foreach my $country (values %countries)
{
- my @servers = sort { $b->{priority} <=> $a->{priority} || $a->{distance} <=> $b->{distance} } @{$country->{servers}};
- my $server = $servers->{$servers[0]->{name}};
+ my $server = $country->{server};
my $clon = $country->{lon};
my $clat = $country->{lat};
my $slon = $server->{lon};
if ($clon > 0 && $slon < 0 && 360 + $slon - $clon < $clon - $slon)
{
- $clon = $clon - 360;
+ $slon = $slon + 360;
}
elsif ($slon > 0 && $clon < 0 && 360 + $clon - $slon < $slon - $clon)
{
- $slon = $slon - 360;
+ $clon = $clon + 360;
}
- $zonefile->print("C\L$country->{code}\E.${zone}:$servers[0]->{name}.${zone}:600\n");
-
- $kmlwriter->startTag("Placemark");
- $kmlwriter->dataElement("name", $country->{name});
- $kmlwriter->startTag("LineString");
- $kmlwriter->dataElement("coordinates", "$clon,$clat $slon,$slat");
- $kmlwriter->endTag("LineString");
- $kmlwriter->endTag("Placemark");
+ $zonefile->print("# $country->{name}\n");
+ $zonefile->print("C\L$country->{code}\E.${zone}:$server->{name}.${zone}:600\n");
+
+ push @json, {
+ type => "Feature",
+ geometry => {
+ type => "LineString",
+ coordinates => [ [ $clon, $clat ], [ $slon, $slat ] ]
+ },
+ properties => {
+ country => $country->{name},
+ server => $server->{name},
+ colour => $server->{colour}
+ }
+ };
}
+# Output default records for IPs that can't be mapped to a country
foreach my $server (grep { $servers->{$_}->{default} } keys %$servers)
{
$zonefile->print("Cxx.${zone}:${server}.${zone}:600\n");
}
-$kmlwriter->endTag("Document");
-$kmlwriter->endTag("kml");
-$kmlwriter->end();
+# Output the GeoJSON text
+$jsonfile->print(encode_json(\@json));
-$kmlfile->close();
+# Close the output files
+$jsonfile->close();
$zonefile->close();
exit 0;
+#
+# Find the centre value between two latitudes
+#
sub centre_lat
{
my $south = shift;
return ( $south + $north ) / 2;
}
+#
+# Find the centre value between two longitudes
+#
sub centre_lon
{
my $west = shift;
return $lon
}
+#
+# Match a country against a server
+#
sub match_country
{
my $server = shift;
{
$match = "allowed";
}
+ elsif ($server->{denied} &&
+ $server->{denied}->{countries} &&
+ grep { $_ eq $country } @{$server->{preferred}->{countries}})
+ {
+ $match = "denied";
+ }
+ elsif ($server->{denied} &&
+ $server->{denied}->{continents} &&
+ grep { $_ eq $continent } @{$server->{preferred}->{continents}})
+ {
+ $match = "denied";
+ }
elsif ($server->{allowed})
{
- $match = "none";
+ $match = "denied";
}
else
{
return $match;
}
+#
+# Compute the great circle distance between two points
+#
sub distance
{
my $lat1 = deg2rad(shift);
return great_circle_distance($lon1, pip2 - $lat1, $lon2, pip2 - $lat2);
}
+
+#
+# Allocate each country to a server
+#
+sub allocate_servers
+{
+ my $mappings = shift;
+
+ # Loop over the mappings, trying to assign each country to the
+ # nearest server, but subject to the bandwidth limits
+ foreach my $mapping (sort { $b->{priority} <=> $a->{priority} || $a->{distance} <=> $b->{distance} } @$mappings)
+ {
+ my $country = $mapping->{country};
+ my $server = $mapping->{server};
+
+ if (!exists($country->{server}) &&
+ $server->{bandwidth_used} + $country->{bandwidth} <= $server->{bandwidth_limit})
+ {
+ $country->{server} = $server;
+ $server->{bandwidth_used} = $server->{bandwidth_used} + $country->{bandwidth};
+ }
+ }
+
+ return;
+}
projects / dns.git / blobdiff