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: I85d48b646b3d0778aae3a7dd3942ad45b4af002d

charmhelpers/contrib/openstack/context.py

@@ -1748,9 +1748,9 @@ class WSGIWorkerConfigContext(WorkerConfigContext):
 
     def __call__(self):
         total_processes = _calculate_workers()
-        enable_wsgi_rotation = config('wsgi-rotation')
-        if enable_wsgi_rotation is None:
-            enable_wsgi_rotation = True
+        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,
@@ -1764,7 +1764,7 @@ class WSGIWorkerConfigContext(WorkerConfigContext):
             "public_processes": int(math.ceil(self.public_process_weight *
                                               total_processes)),
             "threads": 1,
-            "wsgi_rotation": enable_wsgi_rotation,
+            "wsgi_socket_rotation": enable_wsgi_socket_rotation,
         }
         return ctxt
 

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

@@ -12,7 +12,7 @@ Listen {{ admin_port }}
 Listen {{ public_port }}
 {% endif -%}
 
-{% if wsgi_rotation -%}
+{% if wsgi_socket_rotation -%}
 WSGISocketRotation On
 {% else -%}
 WSGISocketRotation Off

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

@@ -12,7 +12,7 @@ Listen {{ admin_port }}
 Listen {{ public_port }}
 {% endif -%}
 
-{% if wsgi_rotation -%}
+{% if wsgi_socket_rotation -%}
 WSGISocketRotation On
 {% else -%}
 WSGISocketRotation Off

charmhelpers/contrib/storage/linux/ceph.py

@@ -158,15 +158,19 @@ def get_osd_settings(relation_name):
     return _order_dict_by_key(osd_settings)
 
 
-def send_application_name(relid=None):
+def send_application_name(relid=None, app_name=None):
     """Send the application name down the relation.
 
     :param relid: Relation id to set application name in.
     :type relid: str
+    :param app_name: Application name to send in the relation.
+    :type app_name: str
     """
+    if app_name is None:
+        app_name = application_name()
     relation_set(
         relation_id=relid,
-        relation_settings={'application-name': application_name()})
+        relation_settings={'application-name': app_name})
 
 
 def send_osd_settings():

charmhelpers/core/unitdata.py

@@ -529,7 +529,8 @@ def kv():
 
     env_var = os.environ.get("CHARM_HELPERS_TESTMODE", "auto").lower()
     if env_var not in ["auto", "no", "yes"]:
-        logging.warning(f"Unknown value for CHARM_HELPERS_TESTMODE '{env_var}', assuming 'no'")
+        logging.warning("Unknown value for CHARM_HELPERS_TESTMODE '%s'"
+                        ", assuming 'no'", env_var)
         env_var = "no"
 
     if env_var == "no":

charmhelpers/fetch/snap.py

@@ -52,7 +52,7 @@ def _snap_exec(commands):
     :param commands: List commands
     :return: Integer exit code
     """
-    assert type(commands) == list
+    assert isinstance(commands, list)
 
     retry_count = 0
     return_code = None

config.yaml

@@ -790,3 +790,11 @@ options:
       allowed and letting the request fail, Negative number: Allows
       unlimited number of local devices, Positive number: Allows only
       these many number of local devices.
+  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.