#!/usr/bin/perl use v5.12; use strict; use warnings; use IO::File; use Math::Trig qw(deg2rad pip2 great_circle_distance); use JSON::XS; use LWP::UserAgent; use YAML; my $originfile = shift @ARGV; my $clusterfile = shift @ARGV; my $zone = shift @ARGV; my $targetoriginfile = shift @ARGV; my $origins = YAML::LoadFile($originfile); my $clusters = YAML::LoadFile($clusterfile); my $gdnsname = shift @ARGV; my @servers; # Initialise cluster details while (my($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, statuscake => $cluster->{statuscake}, bandwidth => $cluster->{bandwidth}, ipv4 => $cluster->{ipv4}, ipv6 => $cluster->{ipv6} }; $cluster->{servers} = [ $server ]; push @servers, $server; } $cluster->{name} = $name; $cluster->{status} = "down"; } # Initialise server details foreach my $server (@servers) { $server->{status} = "up"; } # If statuscake support is enabled then check which servers are up if ($ENV{STATUSCAKE_USERNAME} && $ENV{STATUSCAKE_APIKEY}) { my $ua = LWP::UserAgent->new; my $cache; $ua->agent("mkgeo/1.0"); $ua->default_header("Username", $ENV{STATUSCAKE_USERNAME}); $ua->default_header("API", $ENV{STATUSCAKE_APIKEY}); if (-f "statuscake.yml") { $cache = YAML::LoadFile("statuscake.yml"); } else { $cache = {}; } my $response = $ua->get("https://app.statuscake.com/API/Tests/"); if ($response->is_success) { my $tests = decode_json($response->content); foreach my $test (@$tests) { my $testid = $test->{TestID}; if ($test->{Status} eq "Up" && !$test->{Paused}) { $cache->{$testid} = "up"; } else { $cache->{$testid} = "down"; } } } foreach my $server (@servers) { if (my $testids = $server->{statuscake}) { $server->{status} = "up"; for my $testid (@$testids) { my $testresult = $cache->{$testid} || "down"; $server->{status} = "down" if $testresult eq "down"; } } else { $server->{status} = "down"; } } YAML::DumpFile("statuscake.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}; } } # Create target origins object my $targetorigins = {}; # Initialise cluster details while (my($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 }; } my @mappings = (); # Scan origins and work out which clusters each can use foreach my $origin (values %$origins) { foreach my $cluster (values %$clusters) { my $match = match_origin($cluster, $origin); if ($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}); push @mappings, { origin => $origin, cluster => $cluster, priority => $priority, distance => $distance }; } } } # Allocate each country to a cluster allocate_clusters(@mappings); # If we failed to allocate every origin then loop, increasing # the bandwidth for each cluster by a little and retrying until # we manage to allocate everything while (grep { !exists($_->{cluster}) } values %$origins) { # Clear any existing mappings of countries to clusters foreach my $origin (values %$origins) { delete $origin->{cluster}; } # 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; } # Try the allocate again allocate_clusters(@mappings); } # Create JSON collection object my @json; # Open output files my $zonefile = IO::File->new("> include/${zone}.js") || die "$!"; my $jsonfile = IO::File->new("> json/${zone}.json") || die "$!"; # Output headers $zonefile->print("var \U${zone}\E_RECORDS = [\n"); # Output details for each country foreach my $origin (sort { $a->{name} cmp $b->{name} } values %$origins) { 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 = $clon + 360; } if (!defined($gdnsname)) { $zonefile->print(" CNAME(\"\L$origin->{code}\E.${zone}\", \"$cluster->{name}.${zone}.openstreetmap.org.\", TTL(\"10m\")),\n"); } push @json, { type => "Feature", geometry => { type => "LineString", coordinates => [ [ $clon, $clat ], [ $slon, $slat ] ] }, properties => { origin => $origin->{name}, server => $cluster->{name}, colour => $cluster->{colour} } }; $targetorigins->{$cluster->{name}}->{bandwidth} += $origin->{bandwidth}; } # Skip default records if we don't need them if (!defined($gdnsname)) { # Output default records for IPs that can't be mapped to a country foreach my $cluster (sort { $a->{name} cmp $b->{name} } values %$clusters) { my $name = $cluster->{name}; if (my $default = $cluster->{default}) { output_server($zonefile, "${default}.${zone}", $cluster); } elsif (exists($cluster->{default})) { output_server($zonefile, "${zone}", $cluster); } } } # Output A records for each cluster foreach my $cluster (sort { $a->{name} cmp $b->{name} } values %$clusters) { my $name = $cluster->{name}; output_server($zonefile, "${name}.${zone}", $cluster); if (@{$cluster->{servers}} > 1) { output_server($zonefile, "${name}-%02d.${zone}", $cluster); } } # Output the GeoJSON text $jsonfile->print(encode_json(\@json)); # Output footers $zonefile->print("];\n"); # Close the output files $zonefile->close(); $zonefile->close(); # Output gdnsd configuration if (defined($gdnsname)) { my $gdnsmapfile = IO::File->new("> gdns/${gdnsname}.map") || die "$!"; my $gdnsresourcefile = IO::File->new("> gdns/${gdnsname}.resource") || die "$!"; my $gdnsweightedfile = IO::File->new("> gdns/${gdnsname}.weighted") || die "$!"; my $continent = ""; $gdnsmapfile->print("${gdnsname} => {\n"); $gdnsmapfile->print(" geoip2_db => /usr/share/GeoIP/GeoLite2-Country.mmdb\n"); $gdnsmapfile->print(" datacenters => [" . join(",", sort(keys(%$clusters))) . "]\n"); $gdnsmapfile->print(" map => {\n"); $gdnsmapfile->print(" default => [" . join(",", sort(map { $_->{name} } grep { $_->{default} } values(%$clusters))) . "]\n"); foreach my $origin (sort { $a->{continent} cmp $b->{continent} || $a->{code} cmp $b->{code} } values %$origins) { my $code = $origin->{code}; my $cluster = $origin->{cluster}->{name}; next if $code eq "XK"; if ($continent ne $origin->{continent}) { $gdnsmapfile->print(" }\n") if $continent; $continent = $origin->{continent}; $gdnsmapfile->print(" ${continent} => {\n"); } $gdnsmapfile->print(" ${code} => [${cluster}]\n"); } $gdnsmapfile->print(" }\n") if $continent; $gdnsmapfile->print(" }\n"); $gdnsmapfile->print("}\n"); $gdnsresourcefile->print("${gdnsname} => {\n"); $gdnsresourcefile->print(" map => ${gdnsname}\n"); $gdnsresourcefile->print(" dcmap => {\n"); foreach my $cluster (sort { $a->{name} cmp $b->{name} } values %$clusters) { my $name = $cluster->{name}; if (@{$cluster->{servers}} > 1) { $gdnsweightedfile->print("${name} => {\n"); while (my($index,$server) = each @{$cluster->{servers}}) { if ($server->{status} eq "up") { my $number = sprintf("%02d", $index + 1); my $bandwidth = $server->{bandwidth}; $gdnsweightedfile->print(" ${name}-${number} = [ ${name}-${number}.${zone}.openstreetmap.org., ${bandwidth} ]\n"); } } $gdnsweightedfile->print("}\n"); $gdnsresourcefile->print(" ${name} => %weighted!${name}\n"); } else { $gdnsresourcefile->print(" ${name} => ${name}.${zone}.openstreetmap.org.\n"); } } $gdnsresourcefile->print(" }\n"); $gdnsresourcefile->print("}\n"); $gdnsweightedfile->close(); $gdnsresourcefile->close(); $gdnsmapfile->close(); } # Output the target details in origin format if required YAML::DumpFile($targetoriginfile, $targetorigins) if $targetoriginfile; exit 0; # # Match an origin against a cluster # sub match_origin { my $cluster = shift; my $origin = shift; my $match; if ($cluster->{preferred} && $cluster->{preferred}->{origins} && grep { $_ eq $origin->{name} } @{$cluster->{preferred}->{origins}}) { $match = "preferred"; } elsif ($cluster->{allowed} && $cluster->{allowed}->{origins} && grep { $_ eq $origin->{name} } @{$cluster->{allowed}->{origins}}) { $match = "allowed"; } elsif ($cluster->{preferred} && $cluster->{preferred}->{countries} && grep { $_ eq $origin->{country} } @{$cluster->{preferred}->{countries}}) { $match = "preferred"; } elsif ($cluster->{allowed} && $cluster->{allowed}->{countries} && grep { $_ eq $origin->{country} } @{$cluster->{allowed}->{countries}}) { $match = "allowed"; } elsif ($cluster->{denied} && $cluster->{denied}->{countries} && grep { $_ eq $origin->{country} } @{$cluster->{denied}->{countries}}) { $match = "denied"; } elsif ($cluster->{preferred} && $cluster->{preferred}->{continents} && grep { $_ eq $origin->{continent} } @{$cluster->{preferred}->{continents}}) { $match = "preferred"; } elsif ($cluster->{allowed} && $cluster->{allowed}->{continents} && grep { $_ eq $origin->{continent} } @{$cluster->{allowed}->{continents}}) { $match = "allowed"; } elsif ($cluster->{denied} && $cluster->{denied}->{continents} && grep { $_ eq $origin->{continent} } @{$cluster->{denied}->{continents}}) { $match = "denied"; } elsif ($cluster->{allowed}) { $match = "denied"; } else { $match = "allowed"; } return $match; } # # Compute the great circle distance between two points # sub distance { my $lat1 = deg2rad(shift); my $lon1 = deg2rad(shift); my $lat2 = deg2rad(shift); my $lon2 = deg2rad(shift); return great_circle_distance($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 $cluster = shift; while (my($index,$server) = each @{$cluster->{servers}}) { if ($server->{status} eq "up") { $zonefile->printf(" A(\"${name}\", \"$server->{ipv4}\", TTL(\"10m\")),\n", $index + 1); if ($server->{ipv6}) { $zonefile->printf(" AAAA(\"${name}\", \"$server->{ipv6}\", TTL(\"10m\")),\n", $index + 1); } } } return; }