Prefix memcached_servers IPv6 address with `inet6:`

New dependency: openstack/openstacklib

Depends-On: https://review.opendev.org/661136
Change-Id: I3e1d2108403ece5866a0df0afd367fb80145a0df

manifests/init.pp

@@ -546,6 +546,10 @@ class horizon(
     fail('Only one of cache_server_url or cache_server_ip can be set.')
   }
 
+  if $cache_server_ip {
+    $cache_server_ip_real = inet6_prefix($cache_server_ip)
+  }
+
   $hypervisor_defaults = {
     'can_set_mount_point' => true,
     'can_set_password'    => false,

metadata.json

@@ -12,6 +12,10 @@
         {
             "name": "saz/memcached",
             "version_requirement": ">=2.0.2 <3.0.0"
+        },
+        {
+            "name": "openstack/openstacklib",
+            "version_requirement": ">=15.0.0 <16.0.0"
         }
     ],
     "description": "Installs and configures OpenStack Horizon (Dashboard).",

spec/classes/horizon_init_spec.rb

@@ -249,6 +249,23 @@ describe 'horizon' do
       it { is_expected.to contain_exec('refresh_horizon_django_compress') }
     end
 
+    context 'with overridden parameters and IPv6 cache_server_ip array' do
+      before do
+        params.merge!({
+          :cache_server_ip => ['fd12:3456:789a:1::1','fd12:3456:789a:1::2'],
+        })
+      end
+
+      it 'generates local_settings.py' do
+        verify_concat_fragment_contents(catalogue, 'local_settings.py', [
+          "        'LOCATION': [ 'inet6:[fd12:3456:789a:1::1]:11211','inet6:[fd12:3456:789a:1::2]:11211', ],",
+        ])
+      end
+
+      it { is_expected.to contain_exec('refresh_horizon_django_cache') }
+      it { is_expected.to contain_exec('refresh_horizon_django_compress') }
+    end
+
     context 'with overridden parameters and cache_server_url' do
       before do
         params.merge!({

templates/local_settings.py.erb

@@ -226,11 +226,11 @@ CACHES = {
     <% end -%>
     'BACKEND': '<%= @cache_backend %>',
     <% if @cache_server_ip %>
-          <% if @cache_server_ip.kind_of?(Array) %>
+          <% if @cache_server_ip_real.kind_of?(Array) %>
             <%  split = ":" + @cache_server_port + "','" %>
-        'LOCATION': [ <% @cache_server_ip.each do |ip| -%>'<%= ip -%>:<%= @cache_server_port -%>',<% end -%> ],
+        'LOCATION': [ <% @cache_server_ip_real.each do |ip| -%>'<%= ip -%>:<%= @cache_server_port -%>',<% end -%> ],
           <% else %>
-        'LOCATION': '<%= @cache_server_ip %>:<%= @cache_server_port %>',
+        'LOCATION': '<%= @cache_server_ip_real %>:<%= @cache_server_port %>',
           <% end %>
     <% end %>
     <% if @cache_server_url %>