Change the wsgi path for devstack

Since pip 23.1, the wsgi_script from PBR are not installed anymore
(see [1])

So, instead, rely on the wsgi.py app which is directly bundled in
mistral source code.

[1] https://discuss.python.org/t/adding-support-for-wsgi-scripts-entrypoint/30905/11

Change-Id: Ideed8421427e865f8010b7bfca58c3f010ac6bd6
Signed-off-by: Arnaud M <arnaud.morin@gmail.com>

README.rst

@@ -35,3 +35,5 @@ Project Resources
 
 * Source for the project can be found at:
   https://opendev.org/openstack/mistral
+
+* WSGI app is located in `mistral/api/wsgi.py`

devstack/files/apache-mistral-api.template

@@ -1,9 +1,9 @@
 Listen %PUBLICPORT%
 
 <VirtualHost *:%PUBLICPORT%>
-    WSGIDaemonProcess mistral-api processes=%API_WORKERS% threads=1 user=%USER% display-name=%{GROUP} %VIRTUALENV%
+    WSGIDaemonProcess mistral-api processes=%API_WORKERS% threads=1 user=%USER% display-name=%{GROUP} python-home=%MISTRAL_ENV_DIR%
     WSGIProcessGroup mistral-api
-    WSGIScriptAlias / %MISTRAL_BIN_DIR%/mistral-wsgi-api
+    WSGIScriptAlias / %MISTRAL_DIR%/mistral/api/wsgi.py
     WSGIApplicationGroup %{GLOBAL}
     WSGIPassAuthorization On
     AllowEncodedSlashes On
@@ -12,11 +12,8 @@ Listen %PUBLICPORT%
     </IfVersion>
     ErrorLog /var/log/%APACHE_NAME%/mistral_api.log
     CustomLog /var/log/%APACHE_NAME%/mistral_api_access.log combined
-    %SSLENGINE%
-    %SSLCERTFILE%
-    %SSLKEYFILE%
 
-    <Directory %MISTRAL_BIN_DIR%>
+    <Directory %MISTRAL_DIR%/mistral/api/>
         <IfVersion >= 2.4>
             Require all granted
         </IfVersion>

devstack/plugin.sh

@@ -21,6 +21,10 @@ else
     MISTRAL_BIN_DIR=$(get_python_exec_prefix)
 fi
 
+# By default, mistral is installed in DEVSTACK_VENV
+# NOTE(arnaud) maybe check if PROJECT_VENV should be used here
+MISTRAL_ENV_DIR=${DEVSTACK_VENV}
+
 # Toggle for deploying Mistral API under HTTPD + mod_wsgi
 MISTRAL_USE_MOD_WSGI=${MISTRAL_USE_MOD_WSGI:-True}
 
@@ -249,23 +253,16 @@ function _mistral_cleanup_apache_wsgi {
 function _config_mistral_apache_wsgi {
     local mistral_apache_conf
     mistral_apache_conf=$(apache_site_config_for mistral-api)
-    local mistral_ssl=""
-    local mistral_certfile=""
-    local mistral_keyfile=""
     local mistral_api_port=$MISTRAL_SERVICE_PORT
-    local venv_path=""
 
     sudo cp $MISTRAL_FILES_DIR/apache-mistral-api.template $mistral_apache_conf
     sudo sed -e "
         s|%PUBLICPORT%|$mistral_api_port|g;
         s|%APACHE_NAME%|$APACHE_NAME|g;
-        s|%MISTRAL_BIN_DIR%|$MISTRAL_BIN_DIR|g;
+        s|%MISTRAL_DIR%|$MISTRAL_DIR|g;
+        s|%MISTRAL_ENV_DIR%|$MISTRAL_ENV_DIR|g;
         s|%API_WORKERS%|$API_WORKERS|g;
-        s|%SSLENGINE%|$mistral_ssl|g;
-        s|%SSLCERTFILE%|$mistral_certfile|g;
-        s|%SSLKEYFILE%|$mistral_keyfile|g;
         s|%USER%|$STACK_USER|g;
-        s|%VIRTUALENV%|$venv_path|g
     " -i $mistral_apache_conf
 }
 

setup.cfg

@@ -28,9 +28,6 @@ console_scripts =
     mistral-server = mistral.cmd.launch:main
     mistral-db-manage = mistral.db.sqlalchemy.migration.cli:main
 
-wsgi_scripts =
-    mistral-wsgi-api = mistral.api.app:init_wsgi
-
 mistral.rpc.backends =
     oslo_client = mistral.rpc.oslo.oslo_client:OsloRPCClient
     oslo_server = mistral.rpc.oslo.oslo_server:OsloRPCServer