From 76f343c5868556f12f9ee74b7ef2291cf5e2ff85 Mon Sep 17 00:00:00 2001
From: Rodolfo Alonso Hernandez <ralonsoh@redhat.com>
Date: Wed, 31 Jul 2024 10:53:14 +0000
Subject: [PATCH] Monkey patch the system libraries before calling them

The Neutron API with WSGI module, and specifically when using ML2/OVN,
was importing some system libraries before patching them. That was
leading to a recursion error, as reported in the related LP bug.
By calling ``eventlet_utils.monkey_patch()`` at the very beginning
of the WSGI entry point [1], this issue is fixed.

[1] WSGI entry point:
  $ cat /etc/neutron/neutron-api-uwsgi.ini
  ...
  module = neutron.wsgi.api:application

Closes-Bug: #2075147
Change-Id: If2aa37b2a510a85172da833ca20564810817d246
---
 neutron/wsgi/api.py | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/neutron/wsgi/api.py b/neutron/wsgi/api.py
index ad5ba332a27..7fbafb0f65a 100644
--- a/neutron/wsgi/api.py
+++ b/neutron/wsgi/api.py
@@ -12,10 +12,17 @@
 
 """WSGI application entry-point for Neutron API."""
 
-import threading
+# NOTE: the WSGI module needs to monkey patch the libraries before any other
+# module loads them. That will prevent the recursion error in the SSL library
+# reported in LP#2075147
+# pylint: disable=wrong-import-position
+from neutron.common import eventlet_utils
+eventlet_utils.monkey_patch()
 
-from neutron import server
-from neutron.server import api_eventlet
+import threading  # noqa:E402
+
+from neutron import server  # noqa:E402
+from neutron.server import api_eventlet  # noqa:E402
 
 application = None
 lock = threading.Lock()