Add mysql_enable_ndb option

Add mysql_enable_ndb parameter to select mysql storage engine.

Change-Id: If5d812cde298d85bcac4b7bfb879bc975658f0c6
Depends-On: https://review.opendev.org/#/c/748067
Closes-Bug: #1892952

manifests/db.pp

@@ -38,6 +38,11 @@
 #   (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
+#
 class watcher::db (
   $database_connection              = 'sqlite:////var/lib/watcher/watcher.sqlite',
   $database_connection_recycle_time = $::os_service_default,
@@ -47,6 +52,7 @@ class watcher::db (
   $database_retry_interval          = $::os_service_default,
   $database_max_overflow            = $::os_service_default,
   $database_pool_timeout            = $::os_service_default,
+  $mysql_enable_ndb                 = $::os_service_default,
 ) {
 
   include watcher::deps
@@ -63,5 +69,6 @@ class watcher::db (
     max_pool_size           => $database_max_pool_size,
     max_overflow            => $database_max_overflow,
     pool_timeout            => $database_pool_timeout,
+    mysql_enable_ndb        => $mysql_enable_ndb,
   }
 }

releasenotes/notes/add_mysql_enable_ndb-option-827bb4c2f9aae8fa.yaml

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

spec/classes/watcher_db_spec.rb

@@ -14,6 +14,7 @@ describe 'watcher::db' do
         :retry_interval          => '<SERVICE DEFAULT>',
         :max_overflow            => '<SERVICE DEFAULT>',
         :pool_timeout            => '<SERVICE DEFAULT>',
+        :mysql_enable_ndb        => '<SERVICE DEFAULT>',
       )}
     end
 
@@ -28,6 +29,7 @@ describe 'watcher::db' do
           :database_max_pool_size           => '11',
           :database_max_overflow            => '21',
           :database_pool_timeout            => '21',
+          :mysql_enable_ndb                 => true,
         }
       end
 
@@ -42,6 +44,7 @@ describe 'watcher::db' do
         :retry_interval          => '11',
         :max_overflow            => '21',
         :pool_timeout            => '21',
+        :mysql_enable_ndb        => true,
       )}
     end
   end