Convert placement to new uwsgi mode

This converts the placement API to use the new WSGI_MODE variable
(which is not introduced until the next changeset). We do this so that
placement and keystone patches can be reviewed independently, but
there are some hidden coupling of mod_wsgi setup which happens only in
keystone, so if we do keystone first, it breaks placement.

Change-Id: Id5b2c67701bcc7b12c8e3764c7199d10f85df80f

lib/placement

@@ -32,7 +32,15 @@ set +o xtrace
 PLACEMENT_CONF_DIR=/etc/nova
 PLACEMENT_CONF=$PLACEMENT_CONF_DIR/nova.conf
 PLACEMENT_AUTH_STRATEGY=${PLACEMENT_AUTH_STRATEGY:-placement}
-
+# Nova virtual environment
+if [[ ${USE_VENV} = True ]]; then
+    PROJECT_VENV["nova"]=${NOVA_DIR}.venv
+    PLACEMENT_BIN_DIR=${PROJECT_VENV["nova"]}/bin
+else
+    PLACEMENT_BIN_DIR=$(get_python_exec_prefix)
+fi
+PLACEMENT_UWSGI=$PLACEMENT_BIN_DIR/nova-placement-api
+PLACEMENT_UWSGI_CONF=$PLACEMENT_CONF_DIR/placement-uwsgi.ini
 
 # The placement service can optionally use a separate database
 # connection. Set PLACEMENT_DB_ENABLED to True to use it.
@@ -114,7 +122,13 @@ function configure_placement {
     if [ "$PLACEMENT_DB_ENABLED" != False ]; then
         iniset $PLACEMENT_CONF placement_database connection `database_connection_url placement`
     fi
-    _config_placement_apache_wsgi
+    # TODO(sdague): this really should flag off of something else, but
+    # it won't really work without systemd today.
+    if [[ "$WSGI_MODE" == "uwsgi" ]]; then
+        write_uwsgi_config "$PLACEMENT_UWSGI_CONF" "$PLACEMENT_UWSGI" "/placement"
+    else
+        _config_placement_apache_wsgi
+    fi
 }
 
 # create_placement_accounts() - Set up required placement accounts
@@ -147,9 +161,13 @@ function install_placement {
 
 # start_placement_api() - Start the API processes ahead of other things
 function start_placement_api {
-    enable_apache_site placement-api
-    restart_apache_server
-    tail_log placement-api /var/log/$APACHE_NAME/placement-api.log
+    if [[ "$WSGI_MODE" == "uwsgi" ]]; then
+        run_process "placement-api" "$PLACEMENT_BIN_DIR/uwsgi --ini $PLACEMENT_UWSGI_CONF"
+    else
+        enable_apache_site placement-api
+        restart_apache_server
+        tail_log placement-api /var/log/$APACHE_NAME/placement-api.log
+    fi
 
     echo "Waiting for placement-api to start..."
     if ! wait_for_service $SERVICE_TIMEOUT $PLACEMENT_SERVICE_PROTOCOL://$PLACEMENT_SERVICE_HOST/placement; then
@@ -163,8 +181,13 @@ function start_placement {
 
 # stop_placement() - Disable the api service and stop it.
 function stop_placement {
-    disable_apache_site placement-api
-    restart_apache_server
+    if [[ "$WSGI_MODE" == "uwsgi" ]]; then
+        stop_process "placement-api"
+        remove_uwsgi_config "$PLACEMENT_UWSGI_CONF" "$PLACEMENT_UWSGI"
+    else
+        disable_apache_site placement-api
+        restart_apache_server
+    fi
 }
 
 # Restore xtrace