Using pre-defined Flavors when Openstack not running

Modified the code so as to use pre-defined flavors when openstack
is not running or an exception raises from openstack

Change-Id: I02950e1d615b5d232acdd2f36794acf27bbec977
Closes-Bug: #1526965

translator/hot/tosca/tests/test_tosca_compute.py

@@ -251,3 +251,35 @@ class ToscaComputeTest(TestCase):
             self._tosca_compute_test(
                 tpl_snippet,
                 expectedprops)
+
+    @patch('requests.post')
+    @patch('requests.get')
+    @patch('os.getenv')
+    def test_node_compute_without_nova_flavor(self, mock_os_getenv,
+                                              mock_get, mock_post):
+        tpl_snippet = '''
+        node_templates:
+          server:
+            type: tosca.nodes.Compute
+            capabilities:
+              host:
+                properties:
+                  num_cpus: 1
+                  disk_size: 1 GB
+                  mem_size: 1 GB
+        '''
+        with patch('translator.hot.tosca.tosca_compute.ToscaCompute.'
+                   '_check_for_env_variables') as mock_check_env:
+            mock_check_env.return_value = True
+            mock_os_getenv.side_effect = ['demo', 'demo',
+                                          'demo', 'http://abc.com/5000/']
+            mock_ks_response = mock.MagicMock()
+            mock_ks_content = {}
+            mock_ks_response.content = json.dumps(mock_ks_content)
+            expectedprops = {'key_name': 'userkey',
+                             'flavor': 'm1.small',
+                             'user_data_format': 'SOFTWARE_CONFIG',
+                             'image': None}
+            self._tosca_compute_test(
+                tpl_snippet,
+                expectedprops)

translator/hot/tosca/tosca_compute.py

@@ -20,6 +20,7 @@ from toscaparser.utils.gettextutils import _
 from toscaparser.utils.validateutils import TOSCAVersionProperty
 import translator.common.utils
 from translator.hot.syntax.hot_resource import HotResource
+
 log = logging.getLogger('heat-translator')
 
 
@@ -145,6 +146,7 @@ class ToscaCompute(HotResource):
             }
         }
         headers = {'Content-Type': 'application/json'}
+        try:
             keystone_response = requests.post(auth_url + '/tokens',
                                               data=json.dumps(auth_dict),
                                               headers=headers)
@@ -160,7 +162,8 @@ class ToscaCompute(HotResource):
             if not nova_url:
                 return None
             nova_response = requests.get(nova_url + '/flavors/detail',
-                                     headers={'X-Auth-Token': access_token})
+                                         headers={'X-Auth-Token':
+                                                  access_token})
             if nova_response.status_code != 200:
                 return None
             flavors = json.loads(nova_response.content)['flavors']
@@ -172,6 +175,11 @@ class ToscaCompute(HotResource):
                     'disk_size': flavor['disk'],
                     'num_cpus': flavor['vcpus'],
                 }
+        except Exception as e:
+            # Handles any exception coming from openstack
+            log.warn(_('Choosing predefined flavors since received '
+                       'Openstack Exception: %s') % str(e))
+            return None
         return flavor_dict
 
     def _best_flavor(self, properties):