Remove dead versions code

The versions endpoint is now handled by Pecan
and there is no way to reach this old endpoint
now that we have dropped the web_framework option.

Change-Id: I5d493623b107f125cb9426310f2e43612c94bb7f

etc/api-paste.ini

@@ -36,7 +36,7 @@ paste.filter_factory = keystonemiddleware.auth_token:filter_factory
 paste.filter_factory = neutron.api.extensions:plugin_aware_extension_middleware_factory
 
 [app:neutronversions]
-paste.app_factory = neutron.api.versions:Versions.factory
+paste.app_factory = neutron.pecan_wsgi.app:versions_factory
 
 [app:neutronapiapp_v2_0]
 paste.app_factory = neutron.api.v2.router:APIRouter.factory

neutron/api/versions.py

@@ -13,54 +13,15 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import oslo_i18n
-import webob.dec
+from debtcollector import removals
 
-from neutron._i18n import _
-from neutron.api.views import versions as versions_view
 from neutron.pecan_wsgi import app as pecan_app
-from neutron import wsgi
 
 
 class Versions(object):
 
+    @removals.remove(version="Queens", removal_version="Rocky",
+                     message="Use neutron.pecan_wsgi.app:versions_factory")
     @classmethod
     def factory(cls, global_config, **local_config):
-        # TODO(kevinbenton): get rid of whole class
         return pecan_app.versions_factory(global_config, **local_config)
-
-    @webob.dec.wsgify(RequestClass=wsgi.Request)
-    def __call__(self, req):
-        """Respond to a request for all Neutron API versions."""
-        version_objs = [
-            {
-                "id": "v2.0",
-                "status": "CURRENT",
-            },
-        ]
-
-        if req.path != '/':
-            if self.app:
-                return req.get_response(self.app)
-            language = req.best_match_language()
-            msg = _('Unknown API version specified')
-            msg = oslo_i18n.translate(msg, language)
-            return webob.exc.HTTPNotFound(explanation=msg)
-
-        builder = versions_view.get_view_builder(req)
-        versions = [builder.build(version) for version in version_objs]
-        response = dict(versions=versions)
-        metadata = {}
-
-        content_type = req.best_match_content_type()
-        body = (wsgi.Serializer(metadata=metadata).
-                serialize(response, content_type))
-
-        response = webob.Response()
-        response.content_type = content_type
-        response.body = wsgi.encode_body(body)
-
-        return response
-
-    def __init__(self, app):
-        self.app = app

neutron/tests/etc/api-paste.ini

@@ -36,7 +36,7 @@ paste.filter_factory = keystonemiddleware.auth_token:filter_factory
 paste.filter_factory = neutron.api.extensions:plugin_aware_extension_middleware_factory
 
 [app:neutronversions]
-paste.app_factory = neutron.api.versions:Versions.factory
+paste.app_factory = neutron.pecan_wsgi.app:versions_factory
 
 [app:neutronapiapp_v2_0]
 paste.app_factory = neutron.api.v2.router:APIRouter.factory

releasenotes/notes/noneutronversions-fbbdb98f350767d8.yaml

@@ -0,0 +1,8 @@
+---
+deprecations:
+  - |
+    The api-paste entrypoint ``neutron.api.versions:Versions.factory`` has been
+    deprecated and will be removed in the Rocky release. Please update your
+    api-paste.ini file to use the one that ships with Queens or update any
+    references to the Versions factory to point to
+    ``neutron.pecan_wsgi.app:versions_factory`` instead.