From f1ea0f2d9be21e1a013ed9990f0f86adabb2ecbd Mon Sep 17 00:00:00 2001
From: "Zhang Lei (Sneeze)" <sneezezhang@cienet.com.cn>
Date: Wed, 26 Jun 2013 13:39:42 +0800
Subject: [PATCH] Raise suitable exception when stack validation fails

fixed Bug#1191009

If nova returns an error looking up images during stack validation, we
return a StackValidationFailed, but we should probably catch
this and return ServerError instead, since this is really an internal
error not a validation failure.

Change-Id: Id509b2fa9f78e197cacfe44bae6c3db37cfd6179
---
 heat/engine/parser.py             |  4 ++++
 heat/engine/resources/instance.py |  5 ++++-
 heat/tests/test_validate.py       | 34 +++++++++++++++++++++++++++++++
 3 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/heat/engine/parser.py b/heat/engine/parser.py
index 14b260ae..062e693e 100644
--- a/heat/engine/parser.py
+++ b/heat/engine/parser.py
@@ -32,6 +32,7 @@ from heat.engine.clients import Clients
 from heat.db import api as db_api
 
 from heat.openstack.common import log as logging
+from heat.common.exception import ServerError
 from heat.common.exception import StackValidationFailed
 
 logger = logging.getLogger(__name__)
@@ -238,6 +239,9 @@ class Stack(object):
         for res in self:
             try:
                 result = res.validate()
+            except ServerError as ex:
+                logger.exception(ex)
+                raise ex
             except Exception as ex:
                 logger.exception(ex)
                 raise StackValidationFailed(message=str(ex))
diff --git a/heat/engine/resources/instance.py b/heat/engine/resources/instance.py
index 1d8fbca0..58fb1b59 100644
--- a/heat/engine/resources/instance.py
+++ b/heat/engine/resources/instance.py
@@ -485,7 +485,10 @@ class Instance(resource.Resource):
                             % image_identifier)
                 raise exception.ImageNotFound(image_name=image_identifier)
         else:
-            image_list = self.nova().images.list()
+            try:
+                image_list = self.nova().images.list()
+            except clients.novaclient.exceptions.ClientException as ex:
+                raise exception.ServerError(message=str(ex))
             image_names = dict(
                 (o.id, o.name)
                 for o in image_list if o.name == image_identifier)
diff --git a/heat/tests/test_validate.py b/heat/tests/test_validate.py
index 1cbe1b66..bf6f3c64 100644
--- a/heat/tests/test_validate.py
+++ b/heat/tests/test_validate.py
@@ -14,6 +14,7 @@
 
 from testtools import skipIf
 
+from heat.engine import clients
 from heat.engine import environment
 from heat.tests.v1_1 import fakes
 from heat.common import exception
@@ -430,6 +431,23 @@ test_template_invalid_secgroupids = '''
     }
     '''
 
+test_template_nova_client_exception = '''
+{
+  "AWSTemplateFormatVersion" : "2010-09-09",
+  "Description" : "test.",
+  "Resources" : {
+    "Instance": {
+      "Type": "AWS::EC2::Instance",
+      "DeletionPolicy": "Delete",
+      "Properties": {
+        "ImageId": "image_name",
+        "InstanceType": "m1.large"
+      }
+    }
+  }
+}
+'''
+
 
 class validateTest(HeatTestCase):
     def setUp(self):
@@ -617,3 +635,19 @@ class validateTest(HeatTestCase):
 
         resource = stack.resources['Instance']
         self.assertNotEqual(resource.validate(), None)
+
+    def test_client_exception_from_nova_client(self):
+        t = template_format.parse(test_template_nova_client_exception)
+        template = parser.Template(t)
+        stack = parser.Stack(None, 'test_stack', template)
+
+        self.m.StubOutWithMock(self.fc.images, 'list')
+        self.fc.images.list()\
+            .AndRaise(clients.novaclient.exceptions.ClientException(500))
+        self.m.StubOutWithMock(instances.Instance, 'nova')
+        instances.Instance.nova().AndReturn(self.fc)
+        self.m.ReplayAll()
+
+        self.assertRaises(exception.ServerError,
+                          stack.validate)
+        self.m.VerifyAll()
-- 
2.45.2