7 use Math::Trig qw(deg2rad pip2 great_circle_distance);
12 my $originfile = shift @ARGV;
13 my $clusterfile = shift @ARGV;
14 my $zone = shift @ARGV;
15 my $targetoriginfile = shift @ARGV;
16 my $origins = YAML::LoadFile($originfile);
17 my $clusters = YAML::LoadFile($clusterfile);
20 # Initialise cluster details
21 while (my($name,$cluster) = each %$clusters)
23 if ($cluster->{servers})
25 $cluster->{bandwidth} = 0;
27 foreach my $server (@{$cluster->{servers}})
29 $server->{cluster} = $cluster;
30 $cluster->{bandwidth} = $cluster->{bandwidth} + $server->{bandwidth};
32 push @servers, $server;
39 pingdom => $cluster->{pingdom},
40 bandwidth => $cluster->{bandwidth},
41 ipv4 => $cluster->{ipv4},
42 ipv6 => $cluster->{ipv6}
45 $cluster->{servers} = [ $server ];
47 push @servers, $server;
50 $cluster->{name} = $name;
51 $cluster->{status} = "down";
54 # Initialise server details
55 foreach my $server (@servers)
57 $server->{status} = "up";
60 # If pingdom support is enabled then check which servers are up
61 if ($ENV{PINGDOM_USERNAME} && $ENV{PINGDOM_PASSWORD})
63 my $ua = LWP::UserAgent->new;
67 $ua->default_header("App-Key", "2cohi62u5haxvqmypk3ljqqrze1jufrh");
68 $ua->credentials("api.pingdom.com:443", "Pingdom API", $ENV{PINGDOM_USERNAME}, $ENV{PINGDOM_PASSWORD});
72 $cache = YAML::LoadFile("pingdom.yml");
79 foreach my $server (@servers)
81 if (my $checkid = $server->{pingdom})
83 my $response = $ua->get("https://api.pingdom.com/api/2.0/checks/${checkid}");
85 if ($response->is_success)
87 my $check = decode_json($response->content);
89 $server->{status} = $check->{check}->{status};
90 $cache->{$server->{pingdom}} = $check->{check}->{status};
94 $server->{status} = $cache->{$server->{pingdom}} || "down";
99 YAML::DumpFile("pingdom.yml", $cache);
102 # Mark a cluster as up if any servers are up
103 foreach my $server (@servers)
105 if ($server->{status} eq "up")
107 $server->{cluster}->{status} = "up";
111 $server->{cluster}->{bandwidth} = $server->{cluster}->{bandwidth} - $server->{bandwidth};
115 # Create target origins object
116 my $targetorigins = {};
118 # Initialise cluster details
119 while (my($name,$cluster) = each %$clusters)
121 $cluster->{bandwidth_limit} = $cluster->{bandwidth} * 1024 * 1024;
122 $cluster->{bandwidth_used} = 0;
124 $targetorigins->{$cluster->{name}} = {
125 code => $cluster->{name},
126 name => $cluster->{name},
127 lat => $cluster->{lat},
128 lon => $cluster->{lon},
135 # Scan origins and work out which clusters each can use
136 foreach my $origin (values %$origins)
138 foreach my $cluster (values %$clusters)
140 my $match = match_origin($cluster, $origin);
142 if ($cluster->{status} eq "up" && $match ne "denied")
144 my $priority = $match eq "preferred" ? 20 : 10;
145 my $distance = distance($origin->{lat}, $origin->{lon}, $cluster->{lat}, $cluster->{lon});
148 origin => $origin, cluster => $cluster,
149 priority => $priority, distance => $distance
155 # Allocate each country to a cluster
156 allocate_clusters(@mappings);
158 # If we failed to allocate every origin then loop, increasing
159 # the bandwidth for each cluster by a little and retrying until
160 # we manage to allocate everything
161 while (grep { !exists($_->{cluster}) } values %$origins)
163 # Clear any existing mappings of countries to clusters
164 foreach my $origin (values %$origins)
166 delete $origin->{cluster};
169 # Reset bandwidth usage for clusters and increase limits by 10%
170 foreach my $cluster (values %$clusters)
172 $cluster->{bandwidth_used} = 0;
173 $cluster->{bandwidth_limit} = $cluster->{bandwidth_limit} * 1.1;
176 # Try the allocate again
177 allocate_clusters(@mappings);
180 # Create JSON collection object
184 my $zonefile = IO::File->new("> data/${zone}") || die "$!";
185 my $jsonfile = IO::File->new("> json/${zone}.json") || die "$!";
187 # Output details for each country
188 foreach my $origin (values %$origins)
190 my $cluster = $origin->{cluster};
191 my $clon = $origin->{lon};
192 my $clat = $origin->{lat};
193 my $slon = $cluster->{lon};
194 my $slat = $cluster->{lat};
196 if ($clon > 0 && $slon < 0 && 360 + $slon - $clon < $clon - $slon)
200 elsif ($slon > 0 && $clon < 0 && 360 + $clon - $slon < $slon - $clon)
205 $zonefile->print("# $origin->{name}\n");
206 $zonefile->print("C\L$origin->{code}\E.${zone}:$cluster->{name}.${zone}:600\n");
211 type => "LineString",
212 coordinates => [ [ $clon, $clat ], [ $slon, $slat ] ]
215 origin => $origin->{name},
216 server => $cluster->{name},
217 colour => $cluster->{colour}
221 $targetorigins->{$cluster->{name}}->{bandwidth} += $origin->{bandwidth};
224 # Header for default records
225 $zonefile->print("# Unknown origins\n");
227 # Output default records for IPs that can't be mapped to a country
228 while (my($name,$cluster) = each %$clusters)
230 if (my $default = $cluster->{default})
232 output_server($zonefile, "${default}.${zone}", $cluster);
234 elsif (exists($cluster->{default}))
236 output_server($zonefile, "${zone}", $cluster);
240 # Header for underlying servers
241 $zonefile->print("# Servers\n");
243 # Output A records for each cluster
244 while (my($name,$cluster) = each %$clusters)
246 output_server($zonefile, "${name}.${zone}", $cluster);
249 # Output the GeoJSON text
250 $jsonfile->print(encode_json(\@json));
252 # Close the output files
256 # Output the target details in origin format if required
257 YAML::DumpFile($targetoriginfile, $targetorigins) if $targetoriginfile;
262 # Match an origin against a cluster
270 if ($cluster->{preferred} &&
271 $cluster->{preferred}->{countries} &&
272 grep { $_ eq $origin->{country} } @{$cluster->{preferred}->{countries}})
274 $match = "preferred";
276 elsif ($cluster->{allowed} &&
277 $cluster->{allowed}->{countries} &&
278 grep { $_ eq $origin->{country} } @{$cluster->{allowed}->{countries}})
282 elsif ($cluster->{denied} &&
283 $cluster->{denied}->{countries} &&
284 grep { $_ eq $origin->{country} } @{$cluster->{denied}->{countries}})
288 elsif ($cluster->{preferred} &&
289 $cluster->{preferred}->{continents} &&
290 grep { $_ eq $origin->{continent} } @{$cluster->{preferred}->{continents}})
292 $match = "preferred";
294 elsif ($cluster->{allowed} &&
295 $cluster->{allowed}->{continents} &&
296 grep { $_ eq $origin->{continent} } @{$cluster->{allowed}->{continents}})
300 elsif ($cluster->{denied} &&
301 $cluster->{denied}->{continents} &&
302 grep { $_ eq $origin->{continent} } @{$cluster->{denied}->{continents}})
306 elsif ($cluster->{allowed})
319 # Compute the great circle distance between two points
323 my $lat1 = deg2rad(shift);
324 my $lon1 = deg2rad(shift);
325 my $lat2 = deg2rad(shift);
326 my $lon2 = deg2rad(shift);
328 return great_circle_distance($lon1, pip2 - $lat1, $lon2, pip2 - $lat2);
332 # Allocate each origin to a cluster
334 sub allocate_clusters
336 my @mappings = sort { compare_mappings($a, $b) } @_;
338 # Loop over the mappings, trying to assign each origin to the
339 # nearest cluster, but subject to the bandwidth limits
340 while (my $mapping = shift @mappings)
344 push @group, $mapping;
346 while (@mappings && compare_mappings($mapping, $mappings[0]) == 0)
348 push @group, shift @mappings;
351 for my $mapping (sort compare_bandwidth @group)
353 my $origin = $mapping->{origin};
354 my $cluster = $mapping->{cluster};
356 if (!exists($origin->{cluster}) &&
357 $cluster->{bandwidth_used} + $origin->{bandwidth} <= $cluster->{bandwidth_limit})
359 $origin->{cluster} = $cluster;
360 $cluster->{bandwidth_used} = $cluster->{bandwidth_used} + $origin->{bandwidth};
369 # Compare two mappings to decide which to use
376 return $b->{priority} <=> $a->{priority} ||
377 $a->{distance} <=> $b->{distance};
381 # Compare two mappings to decide which to try first
383 sub compare_bandwidth
385 my $a_used = ( $a->{cluster}->{bandwidth_used} * 100.0 ) / ( $a->{cluster}->{bandwidth_limit} * 1.0 );
386 my $b_used = ( $b->{cluster}->{bandwidth_used} * 100.0 ) / ( $b->{cluster}->{bandwidth_limit} * 1.0 );
388 return $a_used <=> $b_used;
392 # Output DNS records for a server
396 my $zonefile = shift;
400 foreach my $server (@{$cluster->{servers}})
402 if ($server->{status} eq "up")
404 $zonefile->print("+${name}:$server->{ipv4}:3600\n");
408 # $zonefile->print("3${name}:$server->{ipv6}:3600\n");