Add API to retrieve default quotas

Currently there is no support to retrieve default quotas set
for all projects. This patch adds a new API function to get
default quotas.
GET /v2.0/quotas/<tenant-id>/default

DocImpact: Document new API to used to retrieve default quotas
APIImpact: New Read-only API to retrieve default quotas

Change-Id: If40a44348e305da444acd6196d2e0c04202b8f7a
Closes-Bug: #1204956

neutron/db/quota/driver.py

@@ -33,6 +33,22 @@ class DbQuotaDriver(object):
     The default driver utilizes the local database.
     """
 
+    @staticmethod
+    def get_default_quotas(context, resources, tenant_id):
+        """Given a list of resources, retrieve the default quotas set for
+        a tenant.
+
+        :param context: The request context, for access checks.
+        :param resources: A dictionary of the registered resource keys.
+        :param tenant_id: The ID of the tenant to return default quotas for.
+        :return dict: from resource name to dict of name and limit
+        """
+        # Currently the tenant_id parameter is unused, since all tenants
+        # share the same default values. This may change in the future so
+        # we include tenant-id to remain backwards compatible.
+        return dict((key, resource.default)
+                    for key, resource in resources.items())
+
     @staticmethod
     def get_tenant_quotas(context, resources, tenant_id):
         """Given a list of resources, retrieve the quotas for the given

neutron/extensions/quotasv2.py

@@ -31,6 +31,8 @@ from neutron import quota
 from neutron.quota import resource_registry
 from neutron import wsgi
 
+
+DEFAULT_QUOTAS_ACTION = 'default'
 RESOURCE_NAME = 'quota'
 RESOURCE_COLLECTION = RESOURCE_NAME + "s"
 QUOTAS = quota.QUOTAS
@@ -67,6 +69,16 @@ class QuotaSetsController(wsgi.Controller):
             resource_registry.get_all_resources(),
             tenant_id)
 
+    def default(self, request, id):
+        if id != request.context.tenant_id:
+            self._check_admin(request.context,
+                              reason=_("Only admin is authorized "
+                                       "to access quotas for another tenant"))
+        return {self._resource_name: self._driver.get_default_quotas(
+                   context=request.context,
+                   resources=resource_registry.get_all_resources(),
+                   tenant_id=id)}
+
     def create(self, request, body=None):
         msg = _('POST requests are not supported on this resource.')
         raise webob.exc.HTTPNotImplemented(msg)
@@ -144,6 +156,7 @@ class Quotasv2(extensions.ExtensionDescriptor):
         return [extensions.ResourceExtension(
             Quotasv2.get_alias(),
             controller,
+            member_actions={DEFAULT_QUOTAS_ACTION: 'GET'},
             collection_actions={'tenant': 'GET'})]
 
     @classmethod

neutron/tests/unit/db/quota/test_driver.py

@@ -76,6 +76,13 @@ class TestDbQuotaDriver(testlib_api.SqlTestCase):
         quotas = self.plugin.get_tenant_quotas(self.context, defaults, PROJECT)
         self.assertEqual(4, quotas[RESOURCE])
 
+    def test_get_default_quotas(self):
+        defaults = {RESOURCE: TestResource(RESOURCE, 4)}
+        user_ctx = context.Context(user_id=PROJECT, tenant_id=PROJECT)
+        self.plugin.update_quota_limit(self.context, PROJECT, RESOURCE, 2)
+        quotas = self.plugin.get_default_quotas(user_ctx, defaults, PROJECT)
+        self.assertEqual(4, quotas[RESOURCE])
+
     def test_get_tenant_quotas(self):
         user_ctx = context.Context(user_id=PROJECT, tenant_id=PROJECT)
         self.plugin.update_quota_limit(self.context, PROJECT, RESOURCE, 2)

neutron/tests/unit/extensions/test_quotasv2.py

@@ -35,6 +35,7 @@ from neutron.tests import tools
 from neutron.tests.unit.api.v2 import test_base
 from neutron.tests.unit import testlib_api
 
+DEFAULT_QUOTAS_ACTION = 'default'
 TARGET_PLUGIN = 'neutron.plugins.ml2.plugin.Ml2Plugin'
 
 _get_path = test_base._get_path
@@ -126,6 +127,44 @@ class QuotaExtensionDbTestCase(QuotaExtensionTestCase):
              'port': -1,
              'extra1': -1})
 
+    def test_show_default_quotas_with_admin(self):
+        tenant_id = 'tenant_id1'
+        env = {'neutron.context': context.Context('', tenant_id + '2',
+                                                  is_admin=True)}
+        res = self.api.get(_get_path('quotas', id=tenant_id,
+                                     action=DEFAULT_QUOTAS_ACTION,
+                                     fmt=self.fmt),
+                           extra_environ=env)
+        self.assertEqual(200, res.status_int)
+        quota = self.deserialize(res)
+        self.assertEqual(10, quota['quota']['network'])
+        self.assertEqual(10, quota['quota']['subnet'])
+        self.assertEqual(50, quota['quota']['port'])
+
+    def test_show_default_quotas_with_owner_tenant(self):
+        tenant_id = 'tenant_id1'
+        env = {'neutron.context': context.Context('', tenant_id,
+                                                  is_admin=False)}
+        res = self.api.get(_get_path('quotas', id=tenant_id,
+                                     action=DEFAULT_QUOTAS_ACTION,
+                                     fmt=self.fmt),
+                           extra_environ=env)
+        self.assertEqual(200, res.status_int)
+        quota = self.deserialize(res)
+        self.assertEqual(10, quota['quota']['network'])
+        self.assertEqual(10, quota['quota']['subnet'])
+        self.assertEqual(50, quota['quota']['port'])
+
+    def test_show_default_quotas_without_admin_forbidden_returns_403(self):
+        tenant_id = 'tenant_id1'
+        env = {'neutron.context': context.Context('', tenant_id + '2',
+                                                  is_admin=False)}
+        res = self.api.get(_get_path('quotas', id=tenant_id,
+                                     action=DEFAULT_QUOTAS_ACTION,
+                                     fmt=self.fmt),
+                           extra_environ=env, expect_errors=True)
+        self.assertEqual(403, res.status_int)
+
     def test_show_quotas_with_admin(self):
         tenant_id = 'tenant_id1'
         env = {'neutron.context': context.Context('', tenant_id + '2',