Added olso_middleware.sizelimit support

Change-Id: I484e4a88993196f63c8c9285dc2772507cc4d8c5

doc/source/configuration/configref.rst

@@ -26,4 +26,5 @@ Octavia Configuration Options
     oslo.db
     oslo.log
     oslo.messaging
+    oslo.middleware.sizelimit
     cotyledon

etc/config/octavia-config-generator.conf

@@ -9,6 +9,7 @@ namespace = oslo.messaging
 namespace = oslo.middleware.cors
 namespace = oslo.middleware.http_proxy_to_wsgi
 namespace = oslo.middleware.healthcheck
+namespace = oslo.middleware.sizelimit
 namespace = oslo.policy
 namespace = keystonemiddleware.audit
 namespace = keystonemiddleware.auth_token

octavia/api/app.py

@@ -20,6 +20,7 @@ from oslo_log import log as logging
 from oslo_middleware import cors
 from oslo_middleware import http_proxy_to_wsgi
 from oslo_middleware import request_id
+from oslo_middleware import sizelimit
 from pecan import configuration as pecan_configuration
 from pecan import make_app as pecan_make_app
 
@@ -103,4 +104,6 @@ def _wrap_app(app):
         expose_headers=['X-Auth-Token', 'X-Openstack-Request-Id']
     )
 
+    app = sizelimit.RequestBodySizeLimiter(app, cfg.CONF)
+
     return app

releasenotes/notes/add-sizelimit-middleware-91dc6078522f81ec.yaml

@@ -0,0 +1,7 @@
+---
+upgrade:
+  - |
+    Octavia now uses the oslo middleware sizelimit module. It allows to limit
+    the size of the incoming requests in the API. Admins may need to ajust the
+    ``[oslo_middleware].max_request_body_size`` setting to their needs. The
+    default value for ``max_request_body_size`` is 114688 bytes.