Add mysql_enable_ndb option

Add mysql_enable_ndb parameter to select mysql storage engine.

Change-Id: I28bc5b80058521c6918592fc7fa61f9cfdd4781c
Depends-On: https://review.opendev.org/#/c/748067
Closes-Bug: #1892952

manifests/db.pp

@@ -47,6 +47,11 @@
 #   (Optional) If set, use this value for pool_timeout with SQLAlchemy.
 #   Defaults to $::os_service_default
 #
+# [*mysql_enable_ndb*]
+#   (Optional) If True, transparently enables support for handling MySQL
+#   Cluster (NDB).
+#   Defaults to $::os_service_default
+#
 # DEPRECATED PARAMETERS
 #
 # [*database_min_pool_size*]
@@ -64,6 +69,7 @@ class barbican::db (
   $database_pool_size               = $::os_service_default,
   $database_db_max_retries          = $::os_service_default,
   $database_pool_timeout            = $::os_service_default,
+  $mysql_enable_ndb                 = $::os_service_default,
   # DEPRECATED PARAMETERS
   $database_min_pool_size           = undef,
 ) {
@@ -86,6 +92,7 @@ class barbican::db (
     max_overflow            => $database_max_overflow,
     db_max_retries          => $database_db_max_retries,
     pool_timeout            => $database_pool_timeout,
+    mysql_enable_ndb        => $mysql_enable_ndb,
   }
 
   # TODO(aschultz): Remove this config once barbican properly leverages oslo

releasenotes/notes/add_mysql_enable_ndb-option-a5d5e1bd1f274337.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    Add mysql_enable_ndb parameter to select mysql storage engine.

spec/classes/barbican_db_spec.rb

@@ -33,6 +33,7 @@ describe 'barbican::db' do
         :retry_interval          => '<SERVICE DEFAULT>',
         :max_overflow            => '<SERVICE DEFAULT>',
         :pool_timeout            => '<SERVICE DEFAULT>',
+        :mysql_enable_ndb        => '<SERVICE DEFAULT>',
       )}
 
       # TODO(aschultz): remove once oslo is properly used
@@ -52,6 +53,7 @@ describe 'barbican::db' do
           :database_retry_interval          => '11',
           :database_max_overflow            => '11',
           :database_pool_timeout            => '11',
+          :mysql_enable_ndb                 => true,
           :database_pool_size               => '2',
           :database_db_max_retries          => '-1',
         }
@@ -68,6 +70,7 @@ describe 'barbican::db' do
         :retry_interval          => '11',
         :max_overflow            => '11',
         :pool_timeout            => '11',
+        :mysql_enable_ndb        => true,
       )}
 
       # TODO(aschultz) remove once oslo is properly used