add federation configuration

[vchepkov]

Please consider to add rabbitmq_federation plugin managing/configuration

[mUbsta]

rabbitmq_plugin { 'rabbitmq_federation_management': }

will manage the plugin.

This snippet from README.md shows how to setup federation:-

  component_name => 'federation-upstream',
    value          => {
        'uri'     => 'amqp://myserver',
        'expires' => '360000',
    },
  }

[vchepkov]

Unfortunately, I can't properly form uri string with multiple upstream servers

/sbin/rabbitmqctl set_parameter -p VHOST federation-upstream failover '{"uri":["amqp://user:pass@server1/VHOST","amqp://user:pass@server2"],"ack-mode":"on-publish","max-hops":1}

I tried different combinations, but it seems provider doesn't pass it properly

  $upstreams     = $nodes.map | $f | { "amqp://${admin_user}:${admin_pass}@${f}/${vhost}" }
  $upstream_list = $upstreams.join(',')
  $uri           = "[${upstream_list}]"