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

Change-Id: I0834578df444671bbf86b4d08e6b719ece16c661
Closes-Bug: #1835161

manifests/server.pp

@@ -239,6 +239,10 @@
 #   HTTPProxyToWSGI middleware.
 #   Defaults to $::os_service_default.
 #
+# [*max_request_body_size*]
+#   (Optional) Set max request body size
+#   Defaults to $::os_service_default.
+#
 # [*ovs_integration_bridge*]
 #   (Optional) Name of Open vSwitch bridge to use
 #   Defaults to $::os_service_default
@@ -286,6 +290,7 @@ class neutron::server (
   $service_providers                = $::os_service_default,
   $auth_strategy                    = 'keystone',
   $enable_proxy_headers_parsing     = $::os_service_default,
+  $max_request_body_size            = $::os_service_default,
   $ovs_integration_bridge           = $::os_service_default,
 ) inherits ::neutron::params {
 
@@ -426,6 +431,7 @@ class neutron::server (
 
   oslo::middleware { 'neutron_config':
     enable_proxy_headers_parsing => $enable_proxy_headers_parsing,
+    max_request_body_size        => $max_request_body_size,
   }
 
   if $manage_service {

releasenotes/notes/max_request_body_size-8c6e25ab27444c04.yaml

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

spec/classes/neutron_server_spec.rb

@@ -74,6 +74,7 @@ describe 'neutron::server' do
       should contain_neutron_config('DEFAULT/router_scheduler_driver').with_value(p[:router_scheduler_driver])
       should contain_oslo__middleware('neutron_config').with(
         :enable_proxy_headers_parsing => '<SERVICE DEFAULT>',
+        :max_request_body_size        => '<SERVICE DEFAULT>',
       )
       should contain_neutron_config('DEFAULT/ovs_integration_bridge').with_value('<SERVICE DEFAULT>')
     end
@@ -211,6 +212,16 @@ describe 'neutron::server' do
       )}
     end
 
+    context 'with max_request_body_size' do
+      before :each do
+        params.merge!( :max_request_body_size => '102400' )
+      end
+
+      it { should contain_oslo__middleware('neutron_config').with(
+        :max_request_body_size => '102400',
+      )}
+    end
+
     context 'when running neutron-api in wsgi' do
       before :each do
         params.merge!( :service_name => 'httpd' )