Do not call Zabbix in case of deletion of cluster

No reason to call Zabbix to report about changes because
we delete node with it few seconds after.

Also fixed:

zabbix error respond may not contain data field

Example:

{ 'jsonrpc': '2.0', 'id': '1', 'error': {
  'message': "Error connecting to database [Can't connect
              to local MySQL server through socket
              '/var/run/mysqld/mysqld.sock' (2)]",
  'code': 1}}

Change-Id: Ia25c7107b3dc535b6e14db74a82d096fd6caa4d0
Closes-Bug: #1419775

nailgun/nailgun/task/task.py

@@ -380,7 +380,7 @@ class DeletionTask(object):
 
         # TODO(ikalnitsky): remove this, let the flow always go through Astute
         # No need to call Astute if no nodes are specified
-        if respond_to == 'remove_cluster_resp' and \
+        if task.name == consts.TASK_NAMES.cluster_deletion and \
                 not (nodes and nodes['nodes_to_delete']):
             logger.debug("No nodes specified, exiting")
             rcvr = rpc.receiver.NailgunReceiver()
@@ -396,7 +396,8 @@ class DeletionTask(object):
 
         # check if there's a Zabbix server in an environment
         # and if there is, remove hosts
-        if ZabbixManager.get_zabbix_node(task.cluster):
+        if (task.name != consts.TASK_NAMES.cluster_deletion
+                and ZabbixManager.get_zabbix_node(task.cluster)):
             zabbix_credentials = ZabbixManager.get_zabbix_credentials(
                 task.cluster
             )

nailgun/nailgun/test/integration/test_deletion_task.py

@@ -69,6 +69,29 @@ class TestDeletionTask(BaseIntegrationTest):
         self.assertEqual(len(self.cluster_db.nodes), 0)
         self.assertEqual(len(ret), 0)
 
+    @mock.patch('nailgun.task.task.rpc')
+    @mock.patch('nailgun.task.task.make_astute_message')
+    @mock.patch('nailgun.task.task.ZabbixManager')
+    def test_execute_with_zabbix_node(
+            self,
+            mock_zabbix_manager,
+            mmake_astute_message,
+            mrpc):
+        self.add_node(consts.NODE_STATUSES.ready)
+
+        nodes = DeletionTask.get_task_nodes_for_cluster(self.cluster_db)
+        self.assertEqual(len(nodes['nodes_to_delete']), 1)
+
+        task = models.Task(
+            name=consts.TASK_NAMES.cluster_deletion,
+            cluster=self.cluster_db
+        )
+        db().add(task)
+        db().commit()
+
+        DeletionTask.execute(task, nodes=nodes)
+        self.assertEqual(mock_zabbix_manager.get_zabbix_node.called, False)
+
     @mock.patch('nailgun.task.task.rpc')
     @mock.patch('nailgun.task.task.make_astute_message')
     @mock.patch.object(DeletionTask, 'remove_undeployed_nodes_from_db')

nailgun/nailgun/test/unit/test_zabbix_manager.py

@@ -0,0 +1,44 @@
+# -*- coding: utf-8 -*-
+
+#    Copyright 2015 Mirantis, Inc.
+#
+#    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 json
+
+from mock import Mock
+from mock import patch
+
+from nailgun.errors import errors
+from nailgun.test.base import BaseTestCase
+from nailgun.utils.zabbix import ZabbixManager
+
+
+class TestZabbixManager(BaseTestCase):
+
+    @patch('nailgun.utils.zabbix.urllib2.urlopen')
+    def test_error_zabbix_request(self, mock_urlopen):
+        urlopen_value = Mock()
+        urlopen_value.read.return_value = json.dumps({
+            'jsonrpc': '2.0',
+            'id': '1',
+            'error': {
+                'message': "Error connecting to database]",
+                'code': 1}})
+        mock_urlopen.return_value = urlopen_value
+        with self.assertRaises(errors.ZabbixRequestError):
+            ZabbixManager._make_zabbix_request(
+                'fake_url',
+                'user.authenticate',
+                {'password': 'zabbix', 'user': 'admin'},
+                auth=None),

nailgun/nailgun/utils/zabbix.py

@@ -49,7 +49,7 @@ class ZabbixManager(object):
         if 'error' in result:
             code = result['error']['code']
             msg = result['error']['message']
-            data = result['error']['data']
+            data = result['error'].get('data', '')
             raise errors.ZabbixRequestError(
                 "Zabbix returned error code {0}, {1}: {2}".format(
                     code, msg, data