Support disabling apache wsgi socket rotation

Bug LP 1863232 introduced a new Apache configuration option called
WSGISocketRotation which allows users to disable wsgi socket
rotation. This patch makes this configurable with a new
wsgi-socket-rotation config option that defaults to the Apache
default and can optionally be set to False.

Closes-Bug: #2021550
Change-Id: Ib9d8bae0aaf49f836c0165c82fd5e66b3fbe64cb

charmhelpers/contrib/openstack/context.py

@@ -1674,6 +1674,9 @@ class WSGIWorkerConfigContext(WorkerConfigContext):
 
     def __call__(self):
         total_processes = _calculate_workers()
+        enable_wsgi_socket_rotation = config('wsgi-socket-rotation')
+        if enable_wsgi_socket_rotation is None:
+            enable_wsgi_socket_rotation = True
         ctxt = {
             "service_name": self.service_name,
             "user": self.user,
@@ -1687,6 +1690,7 @@ class WSGIWorkerConfigContext(WorkerConfigContext):
             "public_processes": int(math.ceil(self.public_process_weight *
                                               total_processes)),
             "threads": 1,
+            "wsgi_socket_rotation": enable_wsgi_socket_rotation,
         }
         return ctxt
 

charmhelpers/contrib/openstack/templates/wsgi-openstack-api.conf

@@ -12,6 +12,12 @@ Listen {{ admin_port }}
 Listen {{ public_port }}
 {% endif -%}
 
+{% if wsgi_socket_rotation -%}
+WSGISocketRotation On
+{% else -%}
+WSGISocketRotation Off
+{% endif -%}
+
 {% if port -%}
 <VirtualHost *:{{ port }}>
     WSGIDaemonProcess {{ service_name }} processes={{ processes }} threads={{ threads }} user={{ user }} group={{ group }} \

charmhelpers/contrib/openstack/templates/wsgi-openstack-metadata.conf

@@ -12,6 +12,12 @@ Listen {{ admin_port }}
 Listen {{ public_port }}
 {% endif -%}
 
+{% if wsgi_socket_rotation -%}
+WSGISocketRotation On
+{% else -%}
+WSGISocketRotation Off
+{% endif -%}
+
 {% if port -%}
 <VirtualHost *:{{ port }}>
     WSGIDaemonProcess {{ service_name }} processes={{ processes }} threads={{ threads }} user={{ user }} group={{ group }} \

config.yaml

@@ -408,4 +408,11 @@ options:
     description: |
       Max number of entries allowed in the image volume cache. 0 means
       unlimited. Supported on OpenStack Ocata and newer.
-
+  wsgi-socket-rotation:
+    type: boolean
+    default: True
+    description: |
+      Allow users to disable Apache wsgi socket rotation. If not configured,
+      this option sets True as the default value, which is consistent with the
+      default value 'WSGISocketRotation On' in Apache. This option should be
+      used with caution. Please read the Apache doc page for more information.

test-requirements.txt

@@ -36,6 +36,10 @@ stevedore<1.31.0;python_version<'3.6'
 debtcollector<1.22.0;python_version<'3.6'
 oslo.utils<=3.41.0;python_version<'3.6'
 
+# New openstacksdk versions depend on platformdirs>=3 which does not support
+# python 3.6
+openstacksdk<1.6.0; python_version <= '3.6'
+
 coverage>=4.5.2
 pyudev              # for ceph-* charm unit tests (need to fix the ceph-* charm unit tests/mocking)
 git+https://github.com/openstack-charmers/zaza.git@stable/wallaby#egg=zaza