use IO::File;
use Math::Trig qw(deg2rad pip2 great_circle_distance);
-use XML::Writer;
-use XML::TreeBuilder;
+use JSON::XS;
+use LWP::UserAgent;
use YAML;
-my $source = shift @ARGV;
+my $originfile = shift @ARGV;
+my $clusterfile = shift @ARGV;
my $zone = shift @ARGV;
-my $servers = YAML::LoadFile("src/${source}");
+my $targetoriginfile = shift @ARGV;
+my $origins = YAML::LoadFile($originfile);
+my $clusters = YAML::LoadFile($clusterfile);
+my @servers;
-my %countries = ();
+# Initialise cluster details
+while (my($name,$cluster) = each %$clusters)
+{
+ if ($cluster->{servers})
+ {
+ $cluster->{bandwidth} = 0;
+
+ foreach my $server (@{$cluster->{servers}})
+ {
+ $server->{cluster} = $cluster;
+ $cluster->{bandwidth} = $cluster->{bandwidth} + $server->{bandwidth};
+
+ push @servers, $server;
+ }
+ }
+ else
+ {
+ my $server = {
+ cluster => $cluster,
+ pingdom => $cluster->{pingdom},
+ bandwidth => $cluster->{bandwidth},
+ ipv4 => $cluster->{ipv4},
+ ipv6 => $cluster->{ipv6}
+ };
-my $countries = XML::TreeBuilder->new;
+ $cluster->{servers} = [ $server ];
-$countries->parsefile("lib/countries.xml");
+ push @servers, $server;
+ }
-foreach my $country ($countries->look_down("_tag" => "country"))
+ $cluster->{name} = $name;
+ $cluster->{status} = "down";
+}
+
+# Initialise server details
+foreach my $server (@servers)
{
- my $code = $country->look_down("_tag" => "countryCode")->as_text;
- my $name = $country->look_down("_tag" => "countryName")->as_text;
- my $continent = $country->look_down("_tag" => "continent")->as_text;
- my $west = $country->look_down("_tag" => "bBoxWest")->as_text;
- my $north = $country->look_down("_tag" => "bBoxNorth")->as_text;
- my $east = $country->look_down("_tag" => "bBoxEast")->as_text;
- my $south = $country->look_down("_tag" => "bBoxSouth")->as_text;
- my $lat = centre_lat( $south, $north );
- my $lon = centre_lon( $west, $east );
- my @servers;
+ $server->{status} = "up";
+}
- foreach my $servername (keys %$servers)
- {
- my $server = $servers->{$servername};
- my $match = match_country($server, $code, $continent);
+# If pingdom support is enabled then check which servers are up
+if ($ENV{PINGDOM_USERNAME} && $ENV{PINGDOM_PASSWORD})
+{
+ my $ua = LWP::UserAgent->new;
+ my $cache;
- if ($match eq "preferred" || $match eq "allowed")
- {
- my $priority = $match eq "preferred" ? 20 : 10;
- my $distance = distance($lat, $lon, $server->{lat}, $server->{lon});
+ $ua->timeout(5);
+ $ua->default_header("App-Key", "2cohi62u5haxvqmypk3ljqqrze1jufrh");
+ $ua->credentials("api.pingdom.com:443", "Pingdom API", $ENV{PINGDOM_USERNAME}, $ENV{PINGDOM_PASSWORD});
-# print STDERR "$servername is $match for $name with distance $distance\n";
+ if (-f "pingdom.yml")
+ {
+ $cache = YAML::LoadFile("pingdom.yml");
+ }
+ else
+ {
+ $cache = {};
+ }
- push @servers, { name => $servername, priority => $priority, distance => $distance };
+ foreach my $server (@servers)
+ {
+ if (my $checkid = $server->{pingdom})
+ {
+ my $response = $ua->get("https://api.pingdom.com/api/2.0/checks/${checkid}");
+
+ if ($response->is_success)
+ {
+ my $check = decode_json($response->content);
+
+ $server->{status} = $check->{check}->{status};
+ $cache->{$server->{pingdom}} = $check->{check}->{status};
+ }
+ else
+ {
+ $server->{status} = $cache->{$server->{pingdom}} || "down";
+ }
}
}
- $countries{$code} = {
- code => $code, name => $name, continent => $continent,
- lat => $lat, lon => $lon, servers => \@servers
- };
+ YAML::DumpFile("pingdom.yml", $cache);
+}
+
+# Mark a cluster as up if any servers are up
+foreach my $server (@servers)
+{
+ if ($server->{status} eq "up")
+ {
+ $server->{cluster}->{status} = "up";
+ }
+ else
+ {
+ $server->{cluster}->{bandwidth} = $server->{cluster}->{bandwidth} - $server->{bandwidth};
+ }
}
-$countries->delete;
+# Create target origins object
+my $targetorigins = {};
-my $zonefile = IO::File->new("> data/${zone}") || die "$!";
-my $kmlfile = IO::File->new("> kml/${zone}.kml") || die "$!";
-my $kmlwriter = XML::Writer->new(OUTPUT => $kmlfile);
+# Initialise cluster details
+while (my($name,$cluster) = each %$clusters)
+{
+ $cluster->{bandwidth_limit} = $cluster->{bandwidth} * 1024 * 1024;
+ $cluster->{bandwidth_used} = 0;
+
+ $targetorigins->{$cluster->{name}} = {
+ code => $cluster->{name},
+ name => $cluster->{name},
+ lat => $cluster->{lat},
+ lon => $cluster->{lon},
+ bandwidth => 0
+ };
+}
-$kmlwriter->xmlDecl("UTF-8");
-$kmlwriter->startTag("kml", "xmlns" => "http://www.opengis.net/kml/2.2");
-$kmlwriter->startTag("Document");
+my @mappings = ();
-foreach my $country (values %countries)
+# Scan origins and work out which clusters each can use
+foreach my $origin (values %$origins)
{
- my @servers = sort { $b->{priority} <=> $a->{priority} || $a->{distance} <=> $b->{distance} } @{$country->{servers}};
- my $server = $servers->{$servers[0]->{name}};
+ foreach my $cluster (values %$clusters)
+ {
+ my $match = match_origin($cluster, $origin);
- $zonefile->print("C\L$country->{code}\E.${zone}:$servers[0]->{name}.${zone}:600\n");
+ if ($cluster->{status} eq "up" && $match ne "denied")
+ {
+ my $priority = $match eq "preferred" ? 20 : 10;
+ my $distance = distance($origin->{lat}, $origin->{lon}, $cluster->{lat}, $cluster->{lon});
- $kmlwriter->startTag("Placemark");
- $kmlwriter->dataElement("name", $country->{name});
- $kmlwriter->startTag("LineString");
- $kmlwriter->startTag("coordinates");
- $kmlwriter->characters("$country->{lon},$country->{lat}");
- $kmlwriter->characters("$server->{lon},$server->{lat}");
- $kmlwriter->endTag("coordinates");
- $kmlwriter->endTag("LineString");
- $kmlwriter->endTag("Placemark");
+ push @mappings, {
+ origin => $origin, cluster => $cluster,
+ priority => $priority, distance => $distance
+ };
+ }
+ }
}
-foreach my $server (keys %$servers)
+# Allocate each country to a cluster
+allocate_clusters(@mappings);
+
+# If we failed to allocate every origin then loop, increasing
+# the bandwidth for each cluster by a little and retrying until
+# we manage to allocate everything
+while (grep { !exists($_->{cluster}) } values %$origins)
{
- $zonefile->print("Cxx.${zone}:${server}.${zone}:600\n");
-}
+ # Clear any existing mappings of countries to clusters
+ foreach my $origin (values %$origins)
+ {
+ delete $origin->{cluster};
+ }
-$kmlwriter->endTag("Document");
-$kmlwriter->endTag("kml");
-$kmlwriter->end();
+ # Reset bandwidth usage for clusters and increase limits by 10%
+ foreach my $cluster (values %$clusters)
+ {
+ $cluster->{bandwidth_used} = 0;
+ $cluster->{bandwidth_limit} = $cluster->{bandwidth_limit} * 1.1;
+ }
-$kmlfile->close();
-$zonefile->close();
+ # Try the allocate again
+ allocate_clusters(@mappings);
+}
-exit 0;
+# Create JSON collection object
+my @json;
-sub centre_lat
+# Open output files
+my $zonefile = IO::File->new("> data/${zone}") || die "$!";
+my $jsonfile = IO::File->new("> json/${zone}.json") || die "$!";
+
+# Output details for each country
+foreach my $origin (values %$origins)
{
- my $south = shift;
- my $north = shift;
+ my $cluster = $origin->{cluster};
+ my $clon = $origin->{lon};
+ my $clat = $origin->{lat};
+ my $slon = $cluster->{lon};
+ my $slat = $cluster->{lat};
+
+ if ($clon > 0 && $slon < 0 && 360 + $slon - $clon < $clon - $slon)
+ {
+ $slon = $slon + 360;
+ }
+ elsif ($slon > 0 && $clon < 0 && 360 + $clon - $slon < $slon - $clon)
+ {
+ $clon = $clon + 360;
+ }
+
+ $zonefile->print("# $origin->{name}\n");
+ $zonefile->print("C\L$origin->{code}\E.${zone}:$cluster->{name}.${zone}:600\n");
+
+ push @json, {
+ type => "Feature",
+ geometry => {
+ type => "LineString",
+ coordinates => [ [ $clon, $clat ], [ $slon, $slat ] ]
+ },
+ properties => {
+ origin => $origin->{name},
+ server => $cluster->{name},
+ colour => $cluster->{colour}
+ }
+ };
- return ( $south + $north ) / 2;
+ $targetorigins->{$cluster->{name}}->{bandwidth} += $origin->{bandwidth};
}
-sub centre_lon
-{
- my $west = shift;
- my $east = shift;
- my $lon;
+# Header for default records
+$zonefile->print("# Unknown origins\n");
- if ($west < $east)
+# Output default records for IPs that can't be mapped to a country
+while (my($name,$cluster) = each %$clusters)
+{
+ if (my $default = $cluster->{default})
{
- $lon = ( $west + $east ) / 2;
+ output_server($zonefile, "${default}.${zone}", $cluster);
}
- else
+ elsif (exists($cluster->{default}))
{
- $lon = ( $west + $east + 360 ) / 2;
+ output_server($zonefile, "${zone}", $cluster);
}
+}
- $lon = $lon - 360 if $lon > 180;
+# Header for underlying servers
+$zonefile->print("# Servers\n");
- return $lon
+# Output A records for each cluster
+while (my($name,$cluster) = each %$clusters)
+{
+ output_server($zonefile, "${name}.${zone}", $cluster);
}
-sub match_country
+# Output the GeoJSON text
+$jsonfile->print(encode_json(\@json));
+
+# Close the output files
+$jsonfile->close();
+$zonefile->close();
+
+# Output the target details in origin format if required
+YAML::DumpFile($targetoriginfile, $targetorigins) if $targetoriginfile;
+
+exit 0;
+
+#
+# Match an origin against a cluster
+#
+sub match_origin
{
- my $server = shift;
- my $country = shift;
- my $continent = shift;
+ my $cluster = shift;
+ my $origin = shift;
my $match;
- if ($server->{preferred} &&
- $server->{preferred}->{countries} &&
- grep { $_ eq $country } @{$server->{preferred}->{countries}})
+ if ($cluster->{preferred} &&
+ $cluster->{preferred}->{countries} &&
+ grep { $_ eq $origin->{country} } @{$cluster->{preferred}->{countries}})
{
$match = "preferred";
}
- elsif ($server->{preferred} &&
- $server->{preferred}->{continents} &&
- grep { $_ eq $continent } @{$server->{preferred}->{continents}})
+ elsif ($cluster->{preferred} &&
+ $cluster->{preferred}->{continents} &&
+ grep { $_ eq $origin->{continent} } @{$cluster->{preferred}->{continents}})
{
$match = "preferred";
}
- elsif ($server->{allowed} &&
- $server->{allowed}->{countries} &&
- grep { $_ eq $country } @{$server->{allowed}->{countries}})
+ elsif ($cluster->{allowed} &&
+ $cluster->{allowed}->{countries} &&
+ grep { $_ eq $origin->{country} } @{$cluster->{allowed}->{countries}})
{
$match = "allowed";
}
- elsif ($server->{allowed} &&
- $server->{allowed}->{continents} &&
- grep { $_ eq $continent } @{$server->{allowed}->{continents}})
+ elsif ($cluster->{allowed} &&
+ $cluster->{allowed}->{continents} &&
+ grep { $_ eq $origin->{continent} } @{$cluster->{allowed}->{continents}})
{
$match = "allowed";
}
- elsif ($server->{allowed})
+ elsif ($cluster->{denied} &&
+ $cluster->{denied}->{countries} &&
+ grep { $_ eq $origin->{country} } @{$cluster->{preferred}->{countries}})
{
- $match = "none";
+ $match = "denied";
+ }
+ elsif ($cluster->{denied} &&
+ $cluster->{denied}->{continents} &&
+ grep { $_ eq $origin->{continent} } @{$cluster->{preferred}->{continents}})
+ {
+ $match = "denied";
+ }
+ elsif ($cluster->{allowed})
+ {
+ $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 - $lat2);
}
+
+#
+# Allocate each origin to a cluster
+#
+sub allocate_clusters
+{
+ my @mappings = sort { compare_mappings($a, $b) } @_;
+
+ # Loop over the mappings, trying to assign each origin to the
+ # nearest cluster, but subject to the bandwidth limits
+ while (my $mapping = shift @mappings)
+ {
+ my @group;
+
+ push @group, $mapping;
+
+ while (@mappings && compare_mappings($mapping, $mappings[0]) == 0)
+ {
+ push @group, shift @mappings;
+ }
+
+ for my $mapping (sort compare_bandwidth @group)
+ {
+ my $origin = $mapping->{origin};
+ my $cluster = $mapping->{cluster};
+
+ if (!exists($origin->{cluster}) &&
+ $cluster->{bandwidth_used} + $origin->{bandwidth} <= $cluster->{bandwidth_limit})
+ {
+ $origin->{cluster} = $cluster;
+ $cluster->{bandwidth_used} = $cluster->{bandwidth_used} + $origin->{bandwidth};
+ }
+ }
+ }
+
+ return;
+}
+
+#
+# Compare two mappings to decide which to use
+#
+sub compare_mappings
+{
+ my $a = shift;
+ my $b = shift;
+
+ return $b->{priority} <=> $a->{priority} ||
+ $a->{distance} <=> $b->{distance};
+}
+
+#
+# Compare two mappings to decide which to try first
+#
+sub compare_bandwidth
+{
+ my $a_used = ( $a->{cluster}->{bandwidth_used} * 100.0 ) / ( $a->{cluster}->{bandwidth_limit} * 1.0 );
+ my $b_used = ( $b->{cluster}->{bandwidth_used} * 100.0 ) / ( $b->{cluster}->{bandwidth_limit} * 1.0 );
+
+ return $a_used <=> $b_used;
+}
+
+#
+# Output DNS records for a server
+#
+sub output_server
+{
+ my $zonefile = shift;
+ my $name = shift;
+ my $cluster = shift;
+
+ foreach my $server (@{$cluster->{servers}})
+ {
+ if ($server->{status} eq "up")
+ {
+ $zonefile->print("+${name}:$server->{ipv4}:3600\n");
+
+ if ($server->{ipv6})
+ {
+# $zonefile->print("3${name}:$server->{ipv6}:3600\n");
+ }
+ }
+ }
+
+ return;
+}
projects / dns.git / blobdiff