Add support for db_max_retries param

The db_max_retries parameter regulates the number of reconnection
attempts performed after an error raised rather than at startup.

Change-Id: Ib3cfc7b27945389f523d7112d88462995e7416af
Releated-Bug: #1579718

manifests/api/db.pp

@@ -4,6 +4,11 @@
 #
 # === Parameters
 #
+# [*database_db_max_retries*]
+#   (optional) Maximum retries in case of connection error or deadlock error
+#   before error is raised. Set to -1 to specify an infinite retry count.
+#   Defaults to $::os_service_default.
+#
 # [*database_connection*]
 #   Url used to connect to database.
 #   (Optional) Defaults to 'sqlite:///var/lib/glance/glance.sqlite'.
@@ -34,6 +39,7 @@
 #   (Optional) Defaults to $::os_service_default.
 #
 class glance::api::db (
+  $database_db_max_retries = $::os_service_default,
   $database_connection     = 'sqlite:///var/lib/glance/glance.sqlite',
   $database_idle_timeout   = $::os_service_default,
   $database_min_pool_size  = $::os_service_default,
@@ -59,6 +65,7 @@ class glance::api::db (
     '^(sqlite|mysql(\+pymysql)?|postgresql):\/\/(\S+:\S+@\S+\/\S+)?')
 
   oslo::db { 'glance_api_config':
+    db_max_retries => $database_db_max_retries,
     connection     => $database_connection_real,
     idle_timeout   => $database_idle_timeout_real,
     min_pool_size  => $database_min_pool_size_real,

releasenotes/notes/add_db_max_retries-81df176353e781a5.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - Add new option glance::api::db::database_db_max_retries.
+    The database_db_max_retries parameter regulates the
+    number of reconnection attempts performed after an
+    error raised rather than at startup.

spec/classes/glance_api_db_spec.rb

@@ -5,6 +5,7 @@ describe 'glance::api::db' do
   shared_examples 'glance::api::db' do
     context 'with default parameters' do
       it { is_expected.to contain_oslo__db('glance_api_config').with(
+        :db_max_retries => '<SERVICE DEFAULT>',
         :connection     => 'sqlite:///var/lib/glance/glance.sqlite',
         :idle_timeout   => '<SERVICE DEFAULT>',
         :min_pool_size  => '<SERVICE DEFAULT>',
@@ -21,6 +22,7 @@ describe 'glance::api::db' do
           :database_idle_timeout   => '3601',
           :database_min_pool_size  => '2',
           :database_max_retries    => '11',
+          :database_db_max_retries => '-1',
           :database_retry_interval => '11',
           :database_max_pool_size  => '11',
           :database_max_overflow   => '21',
@@ -33,6 +35,7 @@ describe 'glance::api::db' do
         :min_pool_size  => '2',
         :max_pool_size  => '11',
         :max_retries    => '11',
+        :db_max_retries => '-1',
         :retry_interval => '11',
         :max_overflow   => '21',
       )}