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 aodh will return a 413 Entity Too Large
and not log anything to aodh.log.

Change-Id: I3ce3523f00a88dece33657a583d661eea58e90a4
Closes-Bug: #1835161

manifests/api.pp

@@ -36,6 +36,10 @@
 #   HTTPProxyToWSGI middleware.
 #   Defaults to $::os_service_default.
 #
+# [*max_request_body_size*]
+#   (Optional) Set max request body size
+#   Defaults to $::os_service_default.
+#
 # [*paste_config*]
 #   (Optional) Configuration file for WSGI definition of API
 #   Defaults to $::os_service_default.
@@ -62,6 +66,7 @@ class aodh::api (
   $sync_db                        = false,
   $auth_strategy                  = 'keystone',
   $enable_proxy_headers_parsing   = $::os_service_default,
+  $max_request_body_size          = $::os_service_default,
   $paste_config                   = $::os_service_default,
   $gnocchi_external_project_owner = 'services',
   # DEPRECATED PARAMETERS
@@ -138,5 +143,6 @@ as a standalone service, or httpd for being run by a httpd server")
 
   oslo::middleware { 'aodh_config':
     enable_proxy_headers_parsing => $enable_proxy_headers_parsing,
+    max_request_body_size        => $max_request_body_size,
   }
 }

releasenotes/notes/max_request_body_size-a9e6d2796a735b27.yaml

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

spec/classes/aodh_api_spec.rb

@@ -36,6 +36,7 @@ describe 'aodh::api' do
       is_expected.to contain_aodh_config('api/paste_config').with_value('<SERVICE DEFAULT>')
       is_expected.to contain_oslo__middleware('aodh_config').with(
         :enable_proxy_headers_parsing => '<SERVICE DEFAULT>',
+        :max_request_body_size        => '<SERVICE DEFAULT>',
       )
     end
 
@@ -78,6 +79,16 @@ describe 'aodh::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('aodh_config').with(
+        :max_request_body_size => '102400',
+      )}
+    end
+
     context 'with paste_config' do
       before do
         params.merge!({:paste_config => '/etc/aodh/api-paste.ini' })