feat: consul multi-datacentre joining

- add method to join multiple consul datacentres
- set syd1 as the primary datacentre
- use default token from au-syd1 cluster in all locations
- add replication token

site/profiles/manifests/consul/server.pp

@@ -43,6 +43,8 @@ class profiles::consul::server (
   Stdlib::Absolutepath $bin_dir     = '/usr/bin',
   Boolean   $disable_remote_exec    = true,
   Boolean   $disable_update_check   = true,
+  Boolean   $join_remote_regions    = false,
+  Array[String] $remote_regions     = [],
 ) {
 
   # wait for all attributes to be ready
@@ -62,6 +64,21 @@ class profiles::consul::server (
       # if it is, find hosts, sort them so they dont cause changes every run
       $servers_array = sort(query_nodes("enc_role='${members_role}' and region='${::facts['region']}'", 'networking.fqdn'))
 
+      if $join_remote_regions {
+        # get all nodes in the members_role for each other region
+        $region_to_servers = $remote_regions.reduce({}) |$memo, $region| {
+          $servers = sort(query_nodes("enc_role='${members_role}' and region='${region}'", 'networking.fqdn'))
+          $memo + { $region => $servers }
+        }
+
+        # sort and flatten the regions into a single array of fqdns
+        $remote_servers_array = sort(flatten($region_to_servers.values))
+
+      } else {
+        # else just send an empty array
+        $remote_servers_array = []
+      }
+
     # else use provided array from params
     }else{
       $servers_array = $consul_servers
@@ -97,7 +114,8 @@ class profiles::consul::server (
           'performance'          => { 'raft_multiplier' => $raft_multiplier },
           'bind_addr'            => $::facts['networking']['ip'],
           'advertise_addr'       => $::facts['networking']['ip'],
-          'retry_join'           => $servers_array
+          'retry_join'           => $servers_array,
+          'retry_join_wan'       => $remote_servers_array,
         },
       }
     }