Add support for external Dynflow core

manifests/plugin/dynflow.pp

@@ -24,6 +24,7 @@
 #
 # $open_file_limit::       Limit number of open files - Only Red Hat Operating Systems with Software Collections.
 #
+# $external_core::         Forces usage of external/internal Dynflow core
 class foreman_proxy::plugin::dynflow (
   Boolean $enabled = $::foreman_proxy::plugin::dynflow::params::enabled,
   Foreman_proxy::ListenOn $listen_on = $::foreman_proxy::plugin::dynflow::params::listen_on,
@@ -34,6 +35,7 @@
   Optional[Array[String]] $ssl_disabled_ciphers = $::foreman_proxy::plugin::dynflow::params::ssl_disabled_ciphers,
   Optional[Array[String]] $tls_disabled_versions = $::foreman_proxy::plugin::dynflow::params::tls_disabled_versions,
   Integer[1] $open_file_limit = $::foreman_proxy::plugin::dynflow::params::open_file_limit,
+  Optional[Boolean] $external_core = $::foreman_proxy::plugin::dynflow::params::external_core,
 ) inherits foreman_proxy::plugin::dynflow::params {
   if $::foreman_proxy::ssl {
     $core_url = "https://${::fqdn}:${core_port}"

manifests/plugin/dynflow/params.pp

@@ -10,4 +10,8 @@
   $ssl_disabled_ciphers  = undef
   $tls_disabled_versions = undef
   $open_file_limit       = 1000000
+  $external_core         = $facts['osfamily'] ? {
+    'RedHat' => true,
+    default  => undef
+  }
 }

spec/classes/foreman_proxy__plugin__dynflow_spec.rb

@@ -27,12 +27,16 @@
         it { should contain_foreman_proxy__plugin('dynflow') }
 
         it 'should generate correct dynflow.yml' do
-          verify_exact_contents(catalogue, "#{etc_dir}/foreman-proxy/settings.d/dynflow.yml", [
+          lines = [
             '---',
             ':enabled: https',
             ':database: ',
             ':core_url: https://foo.example.com:8008',
-          ])
+          ]
+          lines << ':external_core: true' if has_core
+          verify_exact_contents(catalogue,
+                                "#{etc_dir}/foreman-proxy/settings.d/dynflow.yml",
+                                lines)
         end
 
         if has_core
@@ -78,6 +82,7 @@
           :ssl_disabled_ciphers  => ['NULL-MD5', 'NULL-SHA'],
           :tls_disabled_versions => ['1.1'],
           :open_file_limit       => 8000,
+          :external_core         => false,
         } end
 
         it { should compile.with_all_deps }
@@ -110,6 +115,16 @@
               ':tls_disabled_versions: ["1.1"]',
             ])
           end
+
+          it 'should generate correct dynflow.yml' do
+            verify_exact_contents(catalogue, "#{etc_dir}/foreman-proxy/settings.d/dynflow.yml", [
+              '---',
+              ':enabled: https',
+              ':database: /var/lib/foreman-proxy/dynflow/dynflow.sqlite',
+              ':core_url: https://foo.example.com:8008',
+              ':external_core: false',
+            ])
+          end
         else
           it { should_not contain_foreman_proxy__plugin('dynflow_core') }
           it { should_not contain_file("#{etc_dir}/smart_proxy_dynflow_core/settings.d") }

templates/plugin/dynflow.yml.erb

@@ -2,3 +2,13 @@
 :enabled: <%= @module_enabled %>
 :database: <%= scope.lookupvar('::foreman_proxy::plugin::dynflow::database_path') %>
 :core_url: <%= scope.lookupvar('::foreman_proxy::plugin::dynflow::core_url') %>
+
+# If true, external core will be used even if the core gem is available
+# If false, the feature will be disabled if the core gem is unavailable
+# If unset, the process will fallback to autodetection, using external core if the core gem is unavailable
+<% external_core = scope.lookupvar('::foreman_proxy::plugin::dynflow::external_core') -%>
+<% if [nil, :undefined, :undef].include?(external_core) -%>
+# :external_core: true
+<% else -%>
+:external_core: <%= external_core %>
+<% end -%>