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

Change-Id: I3a658d4426689ba09188b0889082b63a744065fc
Closes-Bug: #1835161

manifests/api.pp

@@ -50,6 +50,10 @@
 #   HTTPProxyToWSGI middleware.
 #   Defaults to $::os_service_default.
 #
+# [*max_request_body_size*]
+#   (Optional) Set max request body size
+#   Defaults to $::os_service_default.
+#
 # [*auth_strategy*]
 #   (optional) Type of authentication to be used.
 #   Defaults to 'keystone'
@@ -64,6 +68,7 @@ class mistral::api (
   $package_ensure                  = present,
   $service_name                    = $::mistral::params::api_service_name,
   $enable_proxy_headers_parsing    = $::os_service_default,
+  $max_request_body_size           = $::os_service_default,
   $auth_strategy                   = 'keystone',
 ) inherits mistral::params {
 
@@ -124,6 +129,7 @@ as a standalone service, or httpd for being run by a httpd server")
 
   oslo::middleware { 'mistral_config':
     enable_proxy_headers_parsing => $enable_proxy_headers_parsing,
+    max_request_body_size        => $max_request_body_size,
   }
 
 }

releasenotes/notes/max_request_body_size-86d0d951e94d181e.yaml

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

spec/classes/mistral_api_spec.rb

@@ -9,6 +9,7 @@ describe 'mistral::api' do
       :bind_host                       => '127.0.0.1',
       :bind_port                       => '1234',
       :enable_proxy_headers_parsing    => false,
+      :max_request_body_size           => '102400',
       :allow_action_execution_deletion => false
     }
   end
@@ -30,6 +31,7 @@ describe 'mistral::api' do
       it { is_expected.to contain_mistral_config('api/port').with_value( params[:bind_port] ) }
       it { is_expected.to contain_oslo__middleware('mistral_config').with(
         :enable_proxy_headers_parsing => params[:enable_proxy_headers_parsing],
+        :max_request_body_size        => params[:max_request_body_size],
       )}
       it { is_expected.to contain_mistral_config('api/allow_action_execution_deletion').with_value( params[:allow_action_execution_deletion] ) }
 
@@ -65,6 +67,16 @@ describe 'mistral::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('mistral_config').with(
+        :max_request_body_size => params[:max_request_body_size],
+      )}
+    end
+
     context 'with disabled service managing' do
       before do
         params.merge!({