placement: Separate deployment from configuration

To allow for the deprecation and future removal of any Placement service
deployment logic from puppet-nova this code first needs to be separated
into its own class.

Change-Id: Iadc2970afb65a6b3a1a3241147d042e6b04b0ad2

manifests/placement.pp

@@ -1,6 +1,6 @@
 # == Class: nova::placement
 #
-# Class for configuring [placement] section in nova.conf.
+# Class for deploying Placement and configuring the [placement] section in nova.conf.
 #
 # === Parameters:
 #
@@ -98,26 +98,17 @@ class nova::placement(
 
   include ::nova::deps
 
-  validate_bool($enabled)
-
   if $os_interface {
     warning('nova::placement::os_interface is deprecated for removal, please use valid_interfaces instead.')
   }
   $valid_interfaces_real = pick($os_interface, $valid_interfaces)
 
-  if $service_name == 'nova-placement-api' {
-    nova::generic_service { 'nova-placement-api':
-      enabled        => $enabled,
-      manage_service => $manage_service,
-      package_name   => $package_name,
-      service_name   => $service_name,
-      ensure_package => $ensure_package,
-    }
-  } elsif $service_name == 'httpd' {
-    # we need to make sure nova-placement-api/uwsgi is stopped before trying to start apache
-    if ($::os_package_type == 'debian') {
-      Service['nova-placement-api'] -> Service[$service_name]
-    }
+  class { '::nova::placement::service':
+    enabled        => $enabled,
+    manage_service => $manage_service,
+    package_name   => $package_name,
+    service_name   => $service_name,
+    ensure_package => $ensure_package,
   }
 
   nova_config {

manifests/placement/service.pp

@@ -0,0 +1,57 @@
+# == Class: nova::placement::service
+#
+# Class for deploying the Placement service.
+#
+# === Parameters:
+#
+# [*enabled*]
+#   (optional) Whether the nova placement api service will be run
+#   Defaults to true
+#
+# [*manage_service*]
+#   (optional) Whether to start/stop the service
+#   Only useful if $::nova::params::service_name is set to
+#   nova-placement-api.
+#   Defaults to true
+#
+# [*package_name*]
+#   (optional) The package name for nova placement.
+#   Defaults to $::nova::params::placement_package_name
+#
+# [*service_name*]
+#   (optional) The service name for the placement service.
+#   Defaults to $::nova::params::placement_service_name
+#
+# [*ensure_package*]
+#   (optional) The state of the nova placement package
+#   Defaults to 'present'
+#
+class nova::placement::service(
+  $enabled             = true,
+  $manage_service      = true,
+  $package_name        = $::nova::params::placement_package_name,
+  $service_name        = $::nova::params::placement_service_name,
+  $ensure_package      = 'present',
+) inherits nova::params {
+
+  include ::nova::deps
+
+  assert_private()
+
+  validate_bool($enabled)
+
+  if $service_name == 'nova-placement-api' {
+    nova::generic_service { 'nova-placement-api':
+      enabled        => $enabled,
+      manage_service => $manage_service,
+      package_name   => $package_name,
+      service_name   => $service_name,
+      ensure_package => $ensure_package,
+    }
+  } elsif $service_name == 'httpd' {
+    # we need to make sure nova-placement-api/uwsgi is stopped before trying to start apache
+    if ($::os_package_type == 'debian') {
+      Service['nova-placement-api'] -> Service[$service_name]
+    }
+  }
+}