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.

This also removes the unused placement-support-package tag.

Change-Id: I31bac02c5895dc6f4090c1012db14bcdc1100aa3

manifests/api.pp

@@ -62,6 +62,9 @@ class placement::api (
       Service <| title == 'httpd' |> { tag +> 'placement-service' }
     } else {
       $api_service_name_real = $api_service_name
+
+      # On any uwsgi config change, we must restart Placement API.
+      Placement_api_uwsgi_config<||> ~> Service['placement-api']
     }
   } else {
     $api_service_name_real = $api_service_name

manifests/db.pp

@@ -86,4 +86,8 @@ class placement::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['placement_config'] -> Anchor['placement::dbsync::begin']
 }

manifests/deps.pp

@@ -24,30 +24,9 @@ class placement::deps {
   ~> Service<| tag == 'placement-service' |>
   ~> anchor { 'placement::service::end': }
 
-  # Support packages need to be installed in the install phase, but we don't
-  # put them in the chain above because we don't want any false dependencies
-  # between packages with the placement-package tag and the placement-support-package
-  # tag.  Note: the package resources here will have a 'before' relationship on
-  # the placement::install::end anchor.  The line between placement-support-package
-  # and placement-package should be whether or not placement services would
-  # need to be restarted if the package state was changed.
-  Anchor['placement::install::begin']
-  -> Package<| tag == 'placement-support-package'|>
-  -> Anchor['placement::install::end']
-
-  # all db settings should be applied and all packages should be installed
-  # before dbsync starts
-  Oslo::Db<||> -> Anchor['placement::dbsync::begin']
-
-  # policy config should occur in the config block also.
-  Anchor['placement::config::begin']
-  -> Openstacklib::Policy<| tag == 'placement' |>
-  -> Anchor['placement::config::end']
-
-  # On any uwsgi config change, we must restart Placement.
   Anchor['placement::config::begin']
   -> Placement_api_uwsgi_config<||>
-  ~> Anchor['placement::config::end']
+  -> Anchor['placement::config::end']
 
   # Installation or config changes will always restart services.
   Anchor['placement::install::end'] ~> Anchor['placement::service::begin']

manifests/keystone/authtoken.pp

@@ -279,4 +279,6 @@ class placement::keystone::authtoken(
       service_type                   => $service_type,
       interface                      => $interface;
   }
+
+  Keystone::Resource::Authtoken['placement_config'] -> Anchor['placement::config::end']
 }

manifests/policy.pp

@@ -65,11 +65,15 @@ class placement::policy (
     file_group   => $::placement::params::group,
     file_format  => 'yaml',
     purge_config => $purge_config,
-    tag          => 'placement',
   }
 
   create_resources('openstacklib::policy', { $policy_path => $policy_parameters })
 
+  # policy config should occur in the config block also.
+  Anchor['placement::config::begin']
+  -> Openstacklib::Policy[$policy_path]
+  -> Anchor['placement::config::end']
+
   oslo::policy { 'placement_config':
     enforce_scope        => $enforce_scope,
     enforce_new_defaults => $enforce_new_defaults,
@@ -77,5 +81,4 @@ class placement::policy (
     policy_default_rule  => $policy_default_rule,
     policy_dirs          => $policy_dirs,
   }
-
 }

spec/classes/placement_policy_spec.rb

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