Support same projects in different domain

Getting 500 error when there are same project name
in different domain.
Selecting one domain from service_credentials.
e.g. services(or service) projects are in default and service_domain
having differrent id. so this selects default's services project
instead of service_domain's services project

Closes-Bug: #1776375
Change-Id: Ibb79423a06062f2e00785c30f54e7ac2a41a4705

aodh/api/controllers/v2/alarm_rules/gnocchi.py

@@ -34,6 +34,10 @@ GNOCCHI_OPTS = [
                default="service",
                help='Project name of resources creator in Gnocchi. '
                '(For example the Ceilometer project name'),
+    cfg.StrOpt('gnocchi_external_domain_name',
+               default="Default",
+               help='Domain name of resources creator in Gnocchi. '
+               '(For example, default or service_domain'),
 ]
 
 
@@ -139,8 +143,12 @@ class AggregationMetricByResourcesLookupRule(AlarmGnocchiThresholdRule):
     def get_external_project_owner():
         kc = keystone_client.get_client(pecan.request.cfg)
         project_name = pecan.request.cfg.api.gnocchi_external_project_owner
+        domain_name = pecan.request.cfg.api.gnocchi_external_domain_name
+        domains = kc.domains.list(name=domain_name)
         try:
-            project = kc.projects.find(name=project_name)
+            project = kc.projects.find(
+                name=project_name,
+                domain_id=domains[0].id)
             return project.id
         except ka_exceptions.NotFound:
             return None

aodh/tests/functional/api/v2/test_alarm_scenarios.py

@@ -2370,6 +2370,9 @@ class TestAlarmsRuleGnocchi(TestAlarmsBase):
         ]}
 
         ks_client = mock.Mock()
+        ks_client.domains.list.return_value = [mock.Mock(
+            id='<my-uuid>',
+            name='Default')]
         ks_client.projects.find.return_value = mock.Mock(id='<my-uuid>')
         get_client.return_value = ks_client