Drop unused A records for clustered CDN nodes

[dns.git] / bin / mkgeo

diff --git a/bin/mkgeo b/bin/mkgeo
index bb29fe60f9fc9604e9e22a61602ff2323ab10c5e..ce0ff2f10c6a19db32408eaf168aad252f0616ca 100755 (executable)
--- a/bin/mkgeo
+++ b/bin/mkgeo
@@ -1,169 +1,442 @@
 #!/usr/bin/perl
 
 #!/usr/bin/perl
 

+use v5.12;
+

 use strict;
 use warnings;
 
 use IO::File;
 use Math::Trig qw(deg2rad pip2 great_circle_distance);
 use strict;
 use warnings;
 
 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;
 
 use YAML;
 

-my $source = shift @ARGV;
+my $originfile = shift @ARGV;
+my $clusterfile = shift @ARGV;

 my $zone = 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 $gdnsname = shift @ARGV;
+my @servers;
+
+# Initialise cluster details
+while (my($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}
+        };

 
 

-my %countries = ();
+        $cluster->{servers} = [ $server ];

 
 

-my $countries = XML::TreeBuilder->new;
+        push @servers, $server;
+    }
+
+    $cluster->{name} = $name;
+    $cluster->{status} = "down";
+}

 
 

-$countries->parsefile("lib/countries.xml");
+# Initialise server details
+foreach my $server (@servers)
+{
+    $server->{status} = "up";
+}

 
 

-foreach my $country ($countries->look_down("_tag" => "country"))
+# If statuscake support is enabled then check which servers are up
+if ($ENV{STATUSCAKE_USERNAME} && $ENV{STATUSCAKE_APIKEY})

 {
 {

-    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;
+    my $ua = LWP::UserAgent->new;
+    my $cache;

 
 

-    foreach my $servername (keys %$servers)
+    $ua->agent("mkgeo/1.0");
+    $ua->default_header("Username", $ENV{STATUSCAKE_USERNAME});
+    $ua->default_header("API", $ENV{STATUSCAKE_APIKEY});
+
+    if (-f "statuscake.yml")

     {
     {

-        my $server = $servers->{$servername};
-        my $match = match_country($server, $code, $continent);
+        $cache = YAML::LoadFile("statuscake.yml");
+    }
+    else
+    {
+        $cache = {};
+    }

 
 

-        if ($match eq "preferred" || $match eq "allowed")
+    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 $priority = $match eq "preferred" ? 20 : 10;
-            my $distance = distance($lat, $lon, $server->{lat}, $server->{lon});
+            my $testid = $test->{TestID};
+
+            if ($test->{Status} eq "Up" && !$test->{Paused})
+            {
+                $cache->{$testid} = "up";
+            }
+            else
+            {
+                $cache->{$testid} = "down";
+            }
+        }
+    }

 
 

-#            print STDERR "$servername is $match for $name with distance $distance\n";
+    foreach my $server (@servers)
+    {
+        if (my $testids = $server->{statuscake})
+        {
+            $server->{status} = "up";

 
 

-            push @servers, { name => $servername, priority => $priority, distance => $distance };
+            for my $testid (@$testids)
+            {
+                my $testresult = $cache->{$testid} || "down";
+
+                $server->{status} = "down" if $testresult eq "down";
+            }
+        }
+        else
+        {
+            $server->{status} = "down";

         }
     }
 
         }
     }
 

-    $countries{$code} = {
-        code => $code, name => $name, continent => $continent,
-        lat => $lat, lon => $lon, servers => \@servers
-    };
+    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};
+    }

 }
 
 }
 

-$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 => $kmlfile, ENCODING => 'utf-8');
+# Initialise cluster details
+while (my($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
+    };
+}

 
 

-$kmlwriter->xmlDecl();
-$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}};
-    my $clon = $country->{lon};
-    my $clat = $country->{lat};
-    my $slon = $server->{lon};
-    my $slat = $server->{lat};
+    foreach my $cluster (values %$clusters)
+    {
+        my $match = match_origin($cluster, $origin);

 
 

-    if ($clon > 0 && $slon < 0 && 360 + $slon - $clon < $clon - $slon)
+        if ($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)

     {
     {

-        $clon = $clon - 360;
+        delete $origin->{cluster};

     }
 
     }
 

-    $zonefile->print("C\L$country->{code}\E.${zone}:$servers[0]->{name}.${zone}:600\n");
+    # 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;
+    }

 
 

-    $kmlwriter->startTag("Placemark");
-    $kmlwriter->dataElement("name", $country->{name});
-    $kmlwriter->startTag("LineString");
-    $kmlwriter->dataElement("coordinates", "$clon,$clat $slon,$slat");
-    $kmlwriter->endTag("LineString");
-    $kmlwriter->endTag("Placemark");
+    # Try the allocate again
+    allocate_clusters(@mappings);

 }
 
 }
 

-foreach my $server (grep { $servers->{$_}->{default} }keys %$servers)
+# 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}.openstreetmap.org.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)

 {
 {

-    $zonefile->print("Cxx.${zone}:${server}.${zone}:600\n");
-}
+    my $cluster = $origin->{cluster};
+    my $clon = $origin->{lon};
+    my $clat = $origin->{lat};
+    my $slon = $cluster->{lon};
+    my $slat = $cluster->{lat};

 
 

-$kmlwriter->endTag("Document");
-$kmlwriter->endTag("kml");
-$kmlwriter->end();
+    if ($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;
+    }

 
 

-$kmlfile->close();
-$zonefile->close();
+    if (!defined($gdnsname))
+    {
+        $zonefile->print("  CNAME(\"\L$origin->{code}\E.${zone}\", \"$cluster->{name}.${zone}.openstreetmap.org.\", TTL(\"10m\")),\n");
+    }

 
 

-exit 0;
+    push @json, {
+        type => "Feature",
+        geometry => {
+            type => "LineString",
+            coordinates => [ [ $clon, $clat ], [ $slon, $slat ] ]
+        },
+        properties => {
+            origin => $origin->{name},
+            server => $cluster->{name},
+            colour => $cluster->{colour}
+        }
+    };

 
 

-sub centre_lat
+    $targetorigins->{$cluster->{name}}->{bandwidth} += $origin->{bandwidth};
+}
+
+# Skip default records if we don't need them
+if (!defined($gdnsname))

 {
 {

-    my $south = shift;
-    my $north = shift;
+    # 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};

 
 

-    return ( $south + $north ) / 2;
+        if (my $default = $cluster->{default})
+        {
+            output_server($zonefile, "${default}.${zone}", $cluster);
+        }
+        elsif (exists($cluster->{default}))
+        {
+            output_server($zonefile, "${zone}", $cluster);
+        }
+    }

 }
 
 }
 

-sub centre_lon
+# Output A records for each cluster
+foreach my $cluster (sort { $a->{name} cmp $b->{name} } values %$clusters)

 {
 {

-    my $west = shift;
-    my $east = shift;
-    my $lon;
+    my $name = $cluster->{name};

 
 

-    if ($west < $east)
+    if (@{$cluster->{servers}} > 1)

     {
     {

-        $lon = ( $west + $east ) / 2;
+        output_server($zonefile, "${name}-%02d.${zone}", $cluster);

     }
     else
     {
     }
     else
     {

-        $lon = ( $west + $east + 360 ) / 2;
+        output_server($zonefile, "${name}.${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");

     }
 
     }
 

-    $lon = $lon - 360 if $lon > 180;
+    $gdnsmapfile->print("    }\n") if $continent;
+
+    $gdnsmapfile->print("  }\n");
+    $gdnsmapfile->print("}\n");
+
+    $gdnsresourcefile->print("${gdnsname} => {\n");
+    $gdnsresourcefile->print("  map => ${gdnsname}\n");
+    $gdnsresourcefile->print("  dcmap => {\n");

 
 

-    return $lon
+    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();

 }
 
 }
 

-sub match_country
+# 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;
 
     my $match;
 

-    if ($server->{preferred} &&
-        $server->{preferred}->{countries} &&
-        grep { $_ eq $country } @{$server->{preferred}->{countries}})
+    if ($cluster->{preferred} &&
+        $cluster->{preferred}->{origins} &&
+        grep { $_ eq $origin->{name} } @{$cluster->{preferred}->{origins}})

     {
         $match = "preferred";
     }
     {
         $match = "preferred";
     }

-    elsif ($server->{preferred} &&
-           $server->{preferred}->{continents} &&
-           grep { $_ eq $continent } @{$server->{preferred}->{continents}})
+    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";
     }
     {
         $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";
     }
     {
         $match = "allowed";
     }

-    elsif ($server->{allowed} &&
-           $server->{allowed}->{continents} &&
-           grep { $_ eq $continent } @{$server->{allowed}->{continents}})
+    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";
     }
     {
         $match = "allowed";
     }

-    elsif ($server->{allowed})
+    elsif ($cluster->{denied} &&
+           $cluster->{denied}->{continents} &&
+           grep { $_ eq $origin->{continent} } @{$cluster->{denied}->{continents}})

     {
     {

-        $match = "none";
+        $match = "denied";
+    }
+    elsif ($cluster->{allowed})
+    {
+        $match = "denied";

     }
     else
     {
     }
     else
     {


@@ -173,6 +446,9 @@ sub match_country
     return $match;
 }
 
     return $match;
 }
 

+#
+# Compute the great circle distance between two points
+#

 sub distance
 {
     my $lat1 = deg2rad(shift);
 sub distance
 {
     my $lat1 = deg2rad(shift);


@@ -182,3 +458,88 @@ sub distance
 
     return great_circle_distance($lon1, pip2 - $lat1, $lon2, pip2 - $lat2);
 }
 
     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;
+}