Manage oslo_middleware/max_request_body_size

So that we can increase it from the default 114688

Useful in case for example the OS-Federation mapping is too large.

If this limit is breached panko will return a 413 Entity Too Large
and not log anything to panko.log.

Change-Id: Ifc011b5a261b7dfd13edf606c8f3cc711ca53489
Closes-Bug: #1835161

manifests/api.pp

@@ -54,6 +54,10 @@
 #   HTTPProxyToWSGI middleware.
 #   Defaults to $::os_service_default.
 #
+# [*max_request_body_size*]
+#   (Optional) Set max request body size
+#   Defaults to $::os_service_default.
+#
 # [*max_retries*]
 #   (Optional) Maximum number of connection retries during startup.
 #   Set to -1 to specify an infinite retry count. (integer value)
@@ -88,6 +92,7 @@ class panko::api (
   $sync_db                      = false,
   $auth_strategy                = 'keystone',
   $enable_proxy_headers_parsing = $::os_service_default,
+  $max_request_body_size        = $::os_service_default,
   $max_retries                  = $::os_service_default,
   $retry_interval               = $::os_service_default,
   $es_ssl_enabled               = $::os_service_default,
@@ -172,6 +177,7 @@ running as a standalone service, or httpd for being run by a httpd server")
 
   oslo::middleware { 'panko_config':
     enable_proxy_headers_parsing => $enable_proxy_headers_parsing,
+    max_request_body_size        => $max_request_body_size,
   }
 
 }

releasenotes/notes/max_request_body_size-b4d7bf22decb115a.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Add support to configure `[oslo_middleware]/max_request_body_size` with
+    `$max_request_body_size`.

spec/classes/panko_api_spec.rb

@@ -50,6 +50,7 @@ describe 'panko::api' do
       is_expected.to contain_panko_config('storage/es_index_name').with_value(params[:es_index_name])
       is_expected.to contain_oslo__middleware('panko_config').with(
         :enable_proxy_headers_parsing => '<SERVICE DEFAULT>',
+        :max_request_body_size        => '<SERVICE DEFAULT>',
       )
       is_expected.to contain_panko_config('database/event_time_to_live').with_value( params[:event_time_to_live] )
     end
@@ -93,6 +94,16 @@ describe 'panko::api' do
       )}
     end
 
+    context 'with max_request_body_size' do
+      before do
+        params.merge!({:max_request_body_size => '102400' })
+      end
+
+      it { is_expected.to contain_oslo__middleware('panko_config').with(
+        :max_request_body_size => '102400',
+      )}
+    end
+
     context 'with disabled service managing' do
       before do
         params.merge!({