Added Monasca Helper

In this changeset, I implemented a Helper class to deal with
Monasca requests.

Change-Id: I14cfab2c45451b8bb2ea5f1f48254b41fa5abae8
Partially-Implements: blueprint monasca-support

watcher/tests/datasource/test_ceilometer_helper.py

@@ -0,0 +1,95 @@
+# -*- encoding: utf-8 -*-
+# Copyright (c) 2015 b<>com
+#
+# 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.
+
+from __future__ import absolute_import
+from __future__ import unicode_literals
+
+import mock
+
+from watcher.common import clients
+from watcher.datasource import ceilometer as ceilometer_helper
+from watcher.tests import base
+
+
+@mock.patch.object(clients.OpenStackClients, 'ceilometer')
+class TestCeilometerHelper(base.BaseTestCase):
+
+    def test_build_query(self, mock_ceilometer):
+        mock_ceilometer.return_value = mock.MagicMock()
+        cm = ceilometer_helper.CeilometerHelper()
+        expected = [{'field': 'user_id', 'op': 'eq', 'value': u'user_id'},
+                    {'field': 'project_id', 'op': 'eq', 'value': u'tenant_id'},
+                    {'field': 'resource_id', 'op': 'eq',
+                     'value': u'resource_id'}]
+
+        query = cm.build_query(user_id="user_id",
+                               tenant_id="tenant_id",
+                               resource_id="resource_id",
+                               user_ids=["user_ids"],
+                               tenant_ids=["tenant_ids"],
+                               resource_ids=["resource_ids"])
+        self.assertEqual(expected, query)
+
+    def test_statistic_aggregation(self, mock_ceilometer):
+        cm = ceilometer_helper.CeilometerHelper()
+        ceilometer = mock.MagicMock()
+        statistic = mock.MagicMock()
+        expected_result = 100
+        statistic[-1]._info = {'aggregate': {'avg': expected_result}}
+        ceilometer.statistics.list.return_value = statistic
+        mock_ceilometer.return_value = ceilometer
+        cm = ceilometer_helper.CeilometerHelper()
+        val = cm.statistic_aggregation(
+            resource_id="INSTANCE_ID",
+            meter_name="cpu_util",
+            period="7300"
+        )
+        self.assertEqual(expected_result, val)
+
+    def test_get_last_sample(self, mock_ceilometer):
+        ceilometer = mock.MagicMock()
+        statistic = mock.MagicMock()
+        expected_result = 100
+        statistic[-1]._info = {'counter_volume': expected_result}
+        ceilometer.samples.list.return_value = statistic
+        mock_ceilometer.return_value = ceilometer
+        cm = ceilometer_helper.CeilometerHelper()
+        val = cm.get_last_sample_value(
+            resource_id="id",
+            meter_name="compute.node.percent"
+        )
+        self.assertEqual(expected_result, val)
+
+    def test_get_last_sample_none(self, mock_ceilometer):
+        ceilometer = mock.MagicMock()
+        expected = []
+        ceilometer.samples.list.return_value = expected
+        mock_ceilometer.return_value = ceilometer
+        cm = ceilometer_helper.CeilometerHelper()
+        val = cm.get_last_sample_values(
+            resource_id="id",
+            meter_name="compute.node.percent"
+        )
+        self.assertEqual(expected, val)
+
+    def test_statistic_list(self, mock_ceilometer):
+        ceilometer = mock.MagicMock()
+        expected_value = []
+        ceilometer.statistics.list.return_value = expected_value
+        mock_ceilometer.return_value = ceilometer
+        cm = ceilometer_helper.CeilometerHelper()
+        val = cm.statistic_list(meter_name="cpu_util")
+        self.assertEqual(expected_value, val)