Refactor resource dependencies

This refactors resource dependencies to improve the following points.

 - Avoid unnecessary dependencies across services. For example aodh
   service does not require cinder db.

 - Restart only api service when config files like paste.ini, which
   are used only be api service is changed.

Change-Id: I6a4c65e81b97235d0ce8a142245927c92ab6e48d

manifests/api.pp

@@ -584,6 +584,12 @@ enabled_backends instead.')
         hasrestart => true,
         tag        => 'glance-service',
       }
+
+      # On any paste-api.ini config change, we must restart Glance API.
+      Glance_api_paste_ini<||> ~> Service['glance-api']
+      # On any uwsgi config change, we must restart Glance API.
+      Glance_api_uwsgi_config<||> ~> Service['glance-api']
+
     } elsif $service_name == 'httpd' {
       service { 'glance-api':
         ensure => 'stopped',
@@ -595,6 +601,10 @@ enabled_backends instead.')
 
       # we need to make sure glance-api/eventlet is stopped before trying to start apache
       Service['glance-api'] -> Service[$service_name]
+
+      # On any paste-api.ini config change, we must restart Glance API.
+      Glance_api_paste_ini<||> ~> Service['glance-api']
+
     } else {
     fail("Invalid service_name. ${::glance::params::api_service_name} for \
 running as a standalone service, or httpd for being run by a httpd server")

manifests/api/authtoken.pp

@@ -278,5 +278,7 @@ class glance::api::authtoken(
       service_token_roles_required   => $service_token_roles_required,
       service_type                   => $service_type,
       interface                      => $interface;
-    }
+  }
+
+  Keystone::Resource::Authtoken['glance_api_config'] -> Anchor['glance::config::end']
 }

manifests/api/db.pp

@@ -68,4 +68,8 @@ class glance::api::db (
     pool_timeout            => $database_pool_timeout,
     mysql_enable_ndb        => $mysql_enable_ndb,
   }
+
+  # all db settings should be applied and all packages should be installed
+  # before dbsync starts
+  Oslo::Db['glance_api_config'] -> Anchor['glance::dbsync::begin']
 }

manifests/deps.pp

@@ -24,19 +24,13 @@ class glance::deps {
   ~> Service<| tag == 'glance-service' |>
   ~> anchor { 'glance::service::end': }
 
-  # all db settings should be applied and all packages should be installed
-  # before dbsync starts
-  Oslo::Db<||> -> Anchor['glance::dbsync::begin']
-
-  # policy config should occur in the config block also.
-  Anchor['glance::config::begin']
-  -> Openstacklib::Policy<| tag == 'glance' |>
-  -> Anchor['glance::config::end']
-
-  # On any uwsgi config change, we must restart Glance API.
   Anchor['glance::config::begin']
   -> Glance_api_uwsgi_config<||>
-  ~> Anchor['glance::config::end']
+  -> Anchor['glance::config::end']
+
+  Anchor['glance::config::begin']
+  -> Glance_api_paste_ini<||>
+  -> Anchor['glance::config::end']
 
   # We need openstackclient before marking service end so that glance
   # will have clients available to create resources. This tag handles the
@@ -46,7 +40,6 @@ class glance::deps {
   -> Anchor['glance::service::end']
 
   # All other inifile providers need to be processed in the config block
-  Anchor['glance::config::begin'] -> Glance_api_paste_ini<||> ~> Anchor['glance::config::end']
   Anchor['glance::config::begin'] -> Glance_image_import_config<||> ~> Anchor['glance::config::end']
   Anchor['glance::config::begin'] -> Glance_swift_config<||> ~> Anchor['glance::config::end']
   Anchor['glance::config::begin'] -> Glance_rootwrap_config<||> ~> Anchor['glance::config::end']

manifests/policy.pp

@@ -70,6 +70,11 @@ class glance::policy (
 
   create_resources('openstacklib::policy', { $policy_path => $policy_parameters })
 
+  # policy config should occur in the config block also.
+  Anchor['glance::config::begin']
+  -> Openstacklib::Policy[$policy_path]
+  -> Anchor['glance::config::end']
+
   oslo::policy { 'glance_api_config':
     enforce_scope        => $enforce_scope,
     enforce_new_defaults => $enforce_new_defaults,

spec/classes/glance_policy_spec.rb

@@ -33,7 +33,6 @@ describe 'glance::policy' do
           :file_group   => 'glance',
           :file_format  => 'yaml',
           :purge_config => false,
-          :tag          => 'glance',
         )
         is_expected.to contain_oslo__policy('glance_api_config').with(
           :enforce_scope        => false,
@@ -64,7 +63,6 @@ describe 'glance::policy' do
           :file_group   => 'glance',
           :file_format  => 'yaml',
           :purge_config => true,
-          :tag          => 'glance',
         )
         is_expected.to contain_oslo__policy('glance_api_config').with(
           :enforce_scope        => false,