fix broken logic of only using hasattr to check for get_x_counts

bug 1081259

Change-Id: I1dad596830685968ae47394e0e85afe1b72ab544

quantum/quantum_plugin_base_v2.py

@@ -23,6 +23,8 @@ methods that needs to be implemented by a v2 Quantum Plug-in.
 
 from abc import ABCMeta, abstractmethod
 
+from quantum.common import exceptions
+
 
 class QuantumPluginBaseV2(object):
 
@@ -87,7 +89,6 @@ class QuantumPluginBaseV2(object):
         """
         pass
 
-    @abstractmethod
     def get_subnets_count(self, context, filters=None):
         """
         Return the number of subnets.  The result depends on the identity of
@@ -101,8 +102,11 @@ class QuantumPluginBaseV2(object):
             match comparison for that value.  Each result returned by this
             function will have matched one of the values for each key in
             filters.
+
+        NOTE: this method is optional, as it was not part of the originally
+              defined plugin API.
         """
-        pass
+        raise exceptions.NotImplementedError()
 
     @abstractmethod
     def delete_subnet(self, context, id):
@@ -172,7 +176,6 @@ class QuantumPluginBaseV2(object):
         """
         pass
 
-    @abstractmethod
     def get_networks_count(self, context, filters=None):
         """
         Return the number of networks.  The result depends on the identity
@@ -186,8 +189,11 @@ class QuantumPluginBaseV2(object):
             match comparison for that value.  Each result returned by this
             function will have matched one of the values for each key in
             filters.
+
+        NOTE: this method is optional, as it was not part of the originally
+              defined plugin API.
         """
-        pass
+        raise exceptions.NotImplementedError()
 
     @abstractmethod
     def delete_network(self, context, id):
@@ -257,7 +263,6 @@ class QuantumPluginBaseV2(object):
         """
         pass
 
-    @abstractmethod
     def get_ports_count(self, context, filters=None):
         """
         Return the number of ports.  The result depends on the identity of
@@ -271,8 +276,11 @@ class QuantumPluginBaseV2(object):
             match comparison for that value.  Each result returned by this
             function will have matched one of the values for each key in
             filters.
+
+        NOTE: this method is optional, as it was not part of the originally
+              defined plugin API.
         """
-        pass
+        raise exceptions.NotImplementedError()
 
     @abstractmethod
     def delete_port(self, context, id):

quantum/quota.py

@@ -272,10 +272,10 @@ def _count_resource(context, plugin, resources, tenant_id):
     # using a DB's optimized counting features. We try to use that one
     # if present. Otherwise just use regular getter to retrieve all objects
     # and count in python, allowing older plugins to still be supported
-    if hasattr(plugin, count_getter_name):
+    try:
         obj_count_getter = getattr(plugin, count_getter_name)
         return obj_count_getter(context, filters={'tenant_id': [tenant_id]})
-    else:
+    except (exceptions.NotImplementedError, AttributeError):
         obj_getter = getattr(plugin, "get_%s" % resources)
         obj_list = obj_getter(context, filters={'tenant_id': [tenant_id]})
         return len(obj_list) if obj_list else 0

quantum/tests/unit/test_api_v2.py

@@ -762,6 +762,23 @@ class QuotaTest(APIv2TestBase):
         self.assertTrue("Quota exceeded for resources" in
                         res.json['QuantumError'])
 
+    def test_create_network_quota_no_counts(self):
+        cfg.CONF.set_override('quota_network', 1, group='QUOTAS')
+        initial_input = {'network': {'name': 'net1', 'tenant_id': _uuid()}}
+        full_input = {'network': {'admin_state_up': True, 'subnets': []}}
+        full_input['network'].update(initial_input['network'])
+
+        instance = self.plugin.return_value
+        instance.get_networks_count.side_effect = (
+            q_exc.NotImplementedError())
+        instance.get_networks.return_value = ["foo"]
+        res = self.api.post_json(
+            _get_path('networks'), initial_input, expect_errors=True)
+        instance.get_networks_count.assert_called_with(mock.ANY,
+                                                       filters=mock.ANY)
+        self.assertTrue("Quota exceeded for resources" in
+                        res.json['QuantumError'])
+
     def test_create_network_quota_without_limit(self):
         cfg.CONF.set_override('quota_network', -1, group='QUOTAS')
         initial_input = {'network': {'name': 'net1', 'tenant_id': _uuid()}}