Implement watcher datamodel list in watcher-decision-engine

1. Add datamodel list endpoint and rpc process.
2. Add datamodel list parased and return.
3. Add related unittest.

Partially Implements:blueprint show-datamodel-api

Change-Id: I758b7ca2bc3d8d596d3457277744336c6629bc4e

watcher/tests/decision_engine/messaging/test_data_model_endpoint.py

@@ -0,0 +1,54 @@
+# -*- encoding: utf-8 -*-
+# Copyright 2019 ZTE Corporation.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+# implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import mock
+import unittest
+
+from watcher.common import exception
+from watcher.common import utils
+from watcher.decision_engine.messaging import data_model_endpoint
+from watcher.decision_engine.model.collector import manager
+from watcher.objects import audit
+
+
+class TestDataModelEndpoint(unittest.TestCase):
+    def setUp(self):
+        self.endpoint_instance = data_model_endpoint.DataModelEndpoint('fake')
+
+    @mock.patch.object(audit.Audit, 'get')
+    def test_get_audit_scope(self, mock_get):
+        mock_get.return_value = mock.Mock(scope='fake_scope')
+        audit_uuid = utils.generate_uuid()
+
+        result = self.endpoint_instance.get_audit_scope(
+            context=None,
+            audit=audit_uuid)
+        self.assertEqual('fake_scope', result)
+
+    @mock.patch.object(audit.Audit, 'get_by_name')
+    def test_get_audit_scope_with_error_name(self, mock_get_by_name):
+        mock_get_by_name.side_effect = exception.AuditNotFound()
+        audit_name = 'error_audit_name'
+
+        self.assertRaises(
+            exception.InvalidIdentity,
+            self.endpoint_instance.get_audit_scope,
+            context=None,
+            audit=audit_name)
+
+    @mock.patch.object(manager, 'CollectorManager', mock.Mock())
+    def test_get_data_model_info(self):
+        result = self.endpoint_instance.get_data_model_info(context='fake')
+        self.assertIn('context', result)

watcher/tests/decision_engine/model/test_model.py

@@ -16,6 +16,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import mock
 import os
 
 from oslo_utils import uuidutils
@@ -63,6 +64,27 @@ class TestModel(base.TestCase):
         model = model_root.ModelRoot.from_xml(struct_str)
         self.assertEqual(expected_model.to_string(), model.to_string())
 
+    @mock.patch.object(model_root.ModelRoot, 'get_all_compute_nodes')
+    @mock.patch.object(model_root.ModelRoot, 'get_node_instances')
+    def test_get_model_to_list(self, mock_instances, mock_nodes):
+        fake_compute_node = mock.MagicMock(
+            uuid='fake_node_uuid',
+            fields=['uuid'])
+        fake_instance = mock.MagicMock(
+            uuid='fake_instance_uuid',
+            fields=['uuid'])
+
+        mock_nodes.return_value = {'fake_node_uuid': fake_compute_node}
+        mock_instances.return_value = [fake_instance]
+
+        expected_keys = ['server_uuid', 'node_uuid']
+
+        result = model_root.ModelRoot().to_list()
+        self.assertEqual(1, len(result))
+
+        result_keys = result[0].keys()
+        self.assertEqual(sorted(expected_keys), sorted(result_keys))
+
     def test_get_node_by_instance_uuid(self):
         model = model_root.ModelRoot()
         uuid_ = "{0}".format(uuidutils.generate_uuid())

watcher/tests/decision_engine/test_rpcapi.py

@@ -52,3 +52,14 @@ class TestDecisionEngineAPI(base.TestCase):
             self.api.get_strategy_info(self.context, "dummy")
             mock_call.assert_called_once_with(
                 self.context, 'get_strategy_info', strategy_name="dummy")
+
+    def test_get_data_model_info(self):
+        with mock.patch.object(om.RPCClient, 'call') as mock_call:
+            self.api.get_data_model_info(
+                self.context,
+                data_model_type='compute',
+                audit=None)
+            mock_call.assert_called_once_with(
+                self.context, 'get_data_model_info',
+                data_model_type='compute',
+                audit=None)