use Math::Trig qw(deg2rad pip2 great_circle_distance);
use JSON::XS;
use LWP::UserAgent;
-use XML::TreeBuilder;
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;
-# Initialise server details
-while (my($name,$server) = each %$servers)
+# Initialise cluster details
+while (my($name,$cluster) = each %$clusters)
{
- $server->{name} = $name;
- $server->{bandwidth} = $server->{bandwidth} * 1024 * 1024;
-
- if ($ENV{PINGDOM_USERNAME} && $ENV{PINGDOM_PASSWORD})
+ if ($cluster->{servers})
{
- $server->{status} = "down";
+ $cluster->{bandwidth} = 0;
+
+ foreach my $server (@{$cluster->{servers}})
+ {
+ $server->{cluster} = $cluster;
+ $cluster->{bandwidth} = $cluster->{bandwidth} + $server->{bandwidth};
+
+ push @servers, $server;
+ }
}
else
{
- $server->{status} = "up";
+ my $server = {
+ cluster => $cluster,
+ pingdom => $cluster->{pingdom},
+ 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)
+{
+ $server->{status} = "up";
}
# If pingdom support is enabled then check which servers are up
if ($ENV{PINGDOM_USERNAME} && $ENV{PINGDOM_PASSWORD})
{
my $ua = LWP::UserAgent->new;
+ my $cache;
+ $ua->timeout(5);
$ua->default_header("App-Key", "2cohi62u5haxvqmypk3ljqqrze1jufrh");
$ua->credentials("api.pingdom.com:443", "Pingdom API", $ENV{PINGDOM_USERNAME}, $ENV{PINGDOM_PASSWORD});
- foreach my $server (values %$servers)
+ if (-f "pingdom.yml")
+ {
+ $cache = YAML::LoadFile("pingdom.yml");
+ }
+ else
+ {
+ $cache = {};
+ }
+
+ foreach my $server (@servers)
{
if (my $checkid = $server->{pingdom})
{
my $check = decode_json($response->content);
$server->{status} = $check->{check}->{status};
+ $cache->{$server->{pingdom}} = $check->{check}->{status};
+ }
+ else
+ {
+ $server->{status} = $cache->{$server->{pingdom}} || "down";
}
}
+ else
+ {
+ $server->{status} = "down";
+ }
}
-}
-my %countries = ();
-my @mappings = ();
-
-# Create a parser for the country database
-my $countries = XML::TreeBuilder->new;
+ YAML::DumpFile("pingdom.yml", $cache);
+}
-# Parse the country database
-$countries->parsefile("lib/countries.xml");
+# 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};
+ }
+}
-# Load the per-country bandwidth details
-my $bandwidth = YAML::LoadFile("bandwidth/${source}.yml");
+# Create target origins object
+my $targetorigins = {};
-# Fill in country table and work out which servers each can use
-foreach my $country ($countries->look_down("_tag" => "country"))
+# Initialise cluster details
+while (my($name,$cluster) = each %$clusters)
{
- 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 $east = $country->look_down("_tag" => "east")->as_text;
- my $south = $country->look_down("_tag" => "south")->as_text;
- my $lat = centre_lat( $south, $north );
- my $lon = centre_lon( $west, $east );
-
- $countries{$code} = {
- code => $code, name => $name, continent => $continent,
- bandwidth => $bandwidth, lat => $lat, lon => $lon
+ $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 = ();
- foreach my $server (values %$servers)
+# Scan origins and work out which clusters each can use
+foreach my $origin (values %$origins)
+{
+ foreach my $cluster (values %$clusters)
{
- my $match = match_country($server, $code, $continent);
+ my $match = match_origin($cluster, $origin);
- if ($server->{status} eq "up" && $match ne "denied")
+ if ($cluster->{status} eq "up" && $match ne "denied")
{
my $priority = $match eq "preferred" ? 20 : 10;
- my $distance = distance($lat, $lon, $server->{lat}, $server->{lon});
+ my $distance = distance($origin->{lat}, $origin->{lon}, $cluster->{lat}, $cluster->{lon});
push @mappings, {
- country => $countries{$code}, server => $server,
+ origin => $origin, cluster => $cluster,
priority => $priority, distance => $distance
};
}
}
}
-# Discard the parsed country database
-$countries->delete;
+# Allocate each country to a cluster
+allocate_clusters(@mappings);
-# 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} <=> $b->{distance} } @mappings)
+# If we failed to allocate every origin then loop, increasing
+# the bandwidth for each cluster by a little and retrying until
+# we manage to allocate everything
+while (grep { !exists($_->{cluster}) } values %$origins)
{
- my $country = $mapping->{country};
- my $server = $mapping->{server};
-
- if ($country->{bandwidth} <= $server->{bandwidth} && !exists($country->{server}))
+ # Clear any existing mappings of countries to clusters
+ foreach my $origin (values %$origins)
{
- $country->{server} = $server;
- $server->{bandwidth} = $server->{bandwidth} - $country->{bandwidth};
+ delete $origin->{cluster};
}
-}
-# Loop over the mappings again, assigning anything that is left
-# as best we can, and allowing bandwidth limits to be exeeded
-foreach my $mapping (sort { $b->{priority} <=> $a->{priority} || $a->{distance} <=> $b->{distance} } @mappings)
-{
- my $country = $mapping->{country};
- my $server = $mapping->{server};
+ # 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;
+ }
- $country->{server} = $server unless exists($country->{server});
+ # Try the allocate again
+ allocate_clusters(@mappings);
}
# Create JSON collection object
my $jsonfile = IO::File->new("> json/${zone}.json") || die "$!";
# Output details for each country
-foreach my $country (values %countries)
+foreach my $origin (values %$origins)
{
- my $server = $country->{server};
- my $clon = $country->{lon};
- my $clat = $country->{lat};
- my $slon = $server->{lon};
- my $slat = $server->{lat};
+ 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)
{
$clon = $clon + 360;
}
- $zonefile->print("C\L$country->{code}\E.${zone}:$server->{name}.${zone}:600\n");
+ $zonefile->print("# $origin->{name}\n");
+ $zonefile->print("C\L$origin->{code}\E.${zone}:$cluster->{name}.${zone}:600\n");
push @json, {
type => "Feature",
coordinates => [ [ $clon, $clat ], [ $slon, $slat ] ]
},
properties => {
- country => $country->{name}
+ origin => $origin->{name},
+ server => $cluster->{name},
+ colour => $cluster->{colour}
}
};
+
+ $targetorigins->{$cluster->{name}}->{bandwidth} += $origin->{bandwidth};
}
+# Header for default records
+$zonefile->print("# Unknown origins\n");
+
# Output default records for IPs that can't be mapped to a country
-foreach my $server (grep { $servers->{$_}->{default} } keys %$servers)
+while (my($name,$cluster) = each %$clusters)
{
- $zonefile->print("Cxx.${zone}:${server}.${zone}:600\n");
+ if (my $default = $cluster->{default})
+ {
+ output_server($zonefile, "${default}.${zone}", $cluster);
+ }
+ elsif (exists($cluster->{default}))
+ {
+ output_server($zonefile, "${zone}", $cluster);
+ }
+}
+
+# Header for underlying servers
+$zonefile->print("# Servers\n");
+
+# Output A records for each cluster
+while (my($name,$cluster) = each %$clusters)
+{
+ output_server($zonefile, "${name}.${zone}", $cluster);
}
# Output the GeoJSON text
$jsonfile->close();
$zonefile->close();
-exit 0;
-
-#
-# Find the centre value between two latitudes
-#
-sub centre_lat
-{
- my $south = shift;
- my $north = shift;
-
- return ( $south + $north ) / 2;
-}
-
-#
-# Find the centre value between two longitudes
-#
-sub centre_lon
-{
- my $west = shift;
- my $east = shift;
- my $lon;
-
- if ($west < $east)
- {
- $lon = ( $west + $east ) / 2;
- }
- else
- {
- $lon = ( $west + $east + 360 ) / 2;
- }
-
- $lon = $lon - 360 if $lon > 180;
+# Output the target details in origin format if required
+YAML::DumpFile($targetoriginfile, $targetorigins) if $targetoriginfile;
- return $lon
-}
+exit 0;
#
-# Match a country against a server
+# Match an origin against a cluster
#
-sub match_country
+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->{allowed} &&
+ $cluster->{allowed}->{countries} &&
+ grep { $_ eq $origin->{country} } @{$cluster->{allowed}->{countries}})
{
- $match = "preferred";
+ $match = "allowed";
}
- elsif ($server->{allowed} &&
- $server->{allowed}->{countries} &&
- grep { $_ eq $country } @{$server->{allowed}->{countries}})
+ elsif ($cluster->{denied} &&
+ $cluster->{denied}->{countries} &&
+ grep { $_ eq $origin->{country} } @{$cluster->{denied}->{countries}})
{
- $match = "allowed";
+ $match = "denied";
}
- elsif ($server->{allowed} &&
- $server->{allowed}->{continents} &&
- grep { $_ eq $continent } @{$server->{allowed}->{continents}})
+ elsif ($cluster->{preferred} &&
+ $cluster->{preferred}->{continents} &&
+ grep { $_ eq $origin->{continent} } @{$cluster->{preferred}->{continents}})
{
- $match = "allowed";
+ $match = "preferred";
}
- elsif ($server->{denied} &&
- $server->{denied}->{countries} &&
- grep { $_ eq $country } @{$server->{preferred}->{countries}})
+ elsif ($cluster->{allowed} &&
+ $cluster->{allowed}->{continents} &&
+ grep { $_ eq $origin->{continent} } @{$cluster->{allowed}->{continents}})
{
- $match = "denied";
+ $match = "allowed";
}
- elsif ($server->{denied} &&
- $server->{denied}->{continents} &&
- grep { $_ eq $continent } @{$server->{preferred}->{continents}})
+ elsif ($cluster->{denied} &&
+ $cluster->{denied}->{continents} &&
+ grep { $_ eq $origin->{continent} } @{$cluster->{denied}->{continents}})
{
$match = "denied";
}
- elsif ($server->{allowed})
+ elsif ($cluster->{allowed})
{
$match = "denied";
}
return great_circle_distance($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}:$server->{ipv4}:600\n");
+
+ if ($server->{ipv6})
+ {
+# $zonefile->print("3${name}:$server->{ipv6}:600\n");
+ }
+ }
+ }
+
+ return;
+}
projects / dns.git / blobdiff