Rework mkgeo to use bandwidth constraints

[dns.git] / bin / mkgeo

diff --git a/bin/mkgeo b/bin/mkgeo
index ce98991c345d38339f7e0292044226742200573d..a47ea816a0dc39510a87a0ec595160706c41943e 100755 (executable)
--- a/bin/mkgeo
+++ b/bin/mkgeo
@@ -15,85 +15,136 @@ my $source = shift @ARGV;
 my $zone = shift @ARGV;
 my $servers = YAML::LoadFile("src/${source}");
 
 my $zone = shift @ARGV;
 my $servers = YAML::LoadFile("src/${source}");
 

-my $ua = LWP::UserAgent->new;
+# Initialise server details
+while (my($name,$server) = each %$servers)
+{
+    $server->{name} = $name;
+    $server->{bandwidth} = $server->{bandwidth} * 1024 * 1024;

 
 

-$ua->default_header("App-Key", "2cohi62u5haxvqmypk3ljqqrze1jufrh");
-$ua->credentials("api.pingdom.com:443", "Pingdom API", $ENV{PINGDOM_USERNAME}, $ENV{PINGDOM_PASSWORD});
+    if ($ENV{PINGDOM_USERNAME} && $ENV{PINGDOM_PASSWORD})
+    {
+        $server->{status} = "down";
+    }
+    else
+    {
+        $server->{status} = "up";
+    }
+}

 
 

-foreach my $server (values %$servers)
+# If pingdom support is enabled then check which servers are up
+if ($ENV{PINGDOM_USERNAME} && $ENV{PINGDOM_PASSWORD})

 {
 {

-    $server->{status} = "down";
+    my $ua = LWP::UserAgent->new;

 
 

-    if (my $checkid = $server->{pingdom})
-    {
-        my $response = $ua->get("https://api.pingdom.com/api/2.0/checks/${checkid}");
+    $ua->default_header("App-Key", "2cohi62u5haxvqmypk3ljqqrze1jufrh");
+    $ua->credentials("api.pingdom.com:443", "Pingdom API", $ENV{PINGDOM_USERNAME}, $ENV{PINGDOM_PASSWORD});

 
 

-        if ($response->is_success)
+    foreach my $server (values %$servers)
+    {
+        if (my $checkid = $server->{pingdom})

         {
         {

-            my $check = decode_json($response->content);
+            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};
+                $server->{status} = $check->{check}->{status};
+            }

         }
     }
 }
 
 my %countries = ();
         }
     }
 }
 
 my %countries = ();

+my @mappings = ();

 
 

+# Create a parser for the country database

 my $countries = XML::TreeBuilder->new;
 
 my $countries = XML::TreeBuilder->new;
 

+# Parse the country database

 $countries->parsefile("lib/countries.xml");
 
 $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;
 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 $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 $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 );
     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);
 
         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});
 
         {
             my $priority = $match eq "preferred" ? 20 : 10;
             my $distance = distance($lat, $lon, $server->{lat}, $server->{lon});
 

-            $priority = $priority * 10 if $server->{status} eq "up";
-
-#            print STDERR "$servername is $match for $name with distance $distance\n";
-
-            push @servers, { name => $servername, priority => $priority, distance => $distance };
+            push @mappings, {
+                country => $countries{$code}, server => $server,
+                priority => $priority, distance => $distance
+            };

         }
     }
         }
     }

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

 }
 
 }
 

+# Discard the parsed country database

 $countries->delete;
 
 $countries->delete;
 

+# 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 = $mapping->{server};
+
+    if ($country->{bandwidth} <= $server->{bandwidth} && !exists($country->{server}))
+    {
+        $country->{server} = $server;
+        $server->{bandwidth} = $server->{bandwidth} - $country->{bandwidth};
+    }
+}
+
+# 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};
+
+    $country->{server} = $server unless exists($country->{server});
+}
+
+# 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');
 
 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');
 

+# Output the KML header

 $kmlwriter->xmlDecl();
 $kmlwriter->startTag("kml", "xmlns" => "http://www.opengis.net/kml/2.2");
 $kmlwriter->startTag("Document");
 
 $kmlwriter->xmlDecl();
 $kmlwriter->startTag("kml", "xmlns" => "http://www.opengis.net/kml/2.2");
 $kmlwriter->startTag("Document");
 

+# Output details for each country

 foreach my $country (values %countries)
 {
 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};
     my $clon = $country->{lon};
     my $clat = $country->{lat};
     my $slon = $server->{lon};


@@ -103,8 +154,12 @@ foreach my $country (values %countries)
     {
         $clon = $clon - 360;
     }
     {
         $clon = $clon - 360;
     }

+    elsif ($slon > 0 && $clon < 0 && 360 + $clon - $slon < $slon - $clon)
+    {
+        $slon = $slon - 360;
+    }

 
 

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

 
     $kmlwriter->startTag("Placemark");
     $kmlwriter->dataElement("name", $country->{name});
 
     $kmlwriter->startTag("Placemark");
     $kmlwriter->dataElement("name", $country->{name});


@@ -114,20 +169,26 @@ foreach my $country (values %countries)
     $kmlwriter->endTag("Placemark");
 }
 
     $kmlwriter->endTag("Placemark");
 }
 

+# 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");
 }
 
 foreach my $server (grep { $servers->{$_}->{default} } keys %$servers)
 {
     $zonefile->print("Cxx.${zone}:${server}.${zone}:600\n");
 }
 

+# End the KML file

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

+# Close the output files

 $kmlfile->close();
 $zonefile->close();
 
 exit 0;
 
 $kmlfile->close();
 $zonefile->close();
 
 exit 0;
 

+#
+# Find the centre value between two latitudes
+#

 sub centre_lat
 {
     my $south = shift;
 sub centre_lat
 {
     my $south = shift;


@@ -136,6 +197,9 @@ sub centre_lat
     return ( $south + $north ) / 2;
 }
 
     return ( $south + $north ) / 2;
 }
 

+#
+# Find the centre value between two longitudes
+#

 sub centre_lon
 {
     my $west = shift;
 sub centre_lon
 {
     my $west = shift;


@@ -156,6 +220,9 @@ sub centre_lon
     return $lon
 }
 
     return $lon
 }
 

+#
+# Match a country against a server
+#

 sub match_country
 {
     my $server = shift;
 sub match_country
 {
     my $server = shift;


@@ -187,9 +254,21 @@ sub match_country
     {
         $match = "allowed";
     }
     {
         $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 ($server->{allowed})
     {
     elsif ($server->{allowed})
     {

-        $match = "none";
+        $match = "denied";

     }
     else
     {
     }
     else
     {


@@ -199,6 +278,9 @@ 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);