Add max_request_body_size option support

Octavia enabled sizelimit middleware in API. This introduces support
for the max_request_body_size option so that users can customize
the limit.

Depends-on: https://review.opendev.org/902049
Change-Id: Iab79e9a4d50e65ea663bb5bb5428585dff48720d

manifests/api.pp

@@ -60,6 +60,10 @@
 #   HTTPProxyToWSGI middleware.
 #   Defaults to $facts['os_service_default'].
 #
+# [*max_request_body_size*]
+#   (Optional) Set max request body size
+#   Defaults to $facts['os_service_default'].
+#
 # [*default_provider_driver*]
 #   (optional) Configure the default provider driver.
 #   Defaults to $facts['os_service_default']
@@ -135,6 +139,7 @@ class octavia::api (
   $allow_tls_terminated_listeners = $facts['os_service_default'],
   Boolean $sync_db                = false,
   $enable_proxy_headers_parsing   = $facts['os_service_default'],
+  $max_request_body_size          = $facts['os_service_default'],
   $default_provider_driver        = $facts['os_service_default'],
   $enabled_provider_drivers       = $facts['os_service_default'],
   $pagination_max_limit           = $facts['os_service_default'],
@@ -238,5 +243,6 @@ running as a standalone service, or httpd for being run by a httpd server")
 
   oslo::middleware { 'octavia_config':
     enable_proxy_headers_parsing => $enable_proxy_headers_parsing
+    max_request_body_size        => $max_request_body_size,
   }
 }

releasenotes/notes/max_request_body_size-152d9e3efb95a859.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    The new ``octavia::api::max_request_body_size`` option has been added.

spec/classes/octavia_api_spec.rb

@@ -71,6 +71,7 @@ describe 'octavia::api' do
         is_expected.to contain_octavia_config('api_settings/allow_prometheus_listeners').with_value('<SERVICE DEFAULT>')
         is_expected.to contain_oslo__middleware('octavia_config').with(
           :enable_proxy_headers_parsing => '<SERVICE DEFAULT>',
+          :max_request_body_size        => '<SERVICE DEFAULT>',
         )
       end
       it 'does not sync the database' do
@@ -123,14 +124,17 @@ describe 'octavia::api' do
       it { is_expected.to contain_class('octavia::db::sync') }
     end
 
-    context 'with enable_proxy_headers_parsing set' do
+    context 'with oslo.middleware options set' do
       before do
         params.merge!({
-          :enable_proxy_headers_parsing => true})
+          :enable_proxy_headers_parsing => true,
+          :max_request_body_size        => 114688,
+        })
       end
       it 'configures enable_proxy_headers_parsing' do
         is_expected.to contain_oslo__middleware('octavia_config').with(
           :enable_proxy_headers_parsing => true,
+          :max_request_body_size        => 114688,
         )
       end
     end