add bare except to catch errors

Change-Id: Ibe78912cf923591bddd6a8cf0e683cd028c9c4e8

swift/common/middleware/catch_errors.py

@@ -14,7 +14,6 @@
 # limitations under the License.
 
 from swift import gettext_ as _
-from eventlet import Timeout
 
 from swift.common.swob import Request, HTTPServerError
 from swift.common.utils import get_logger, generate_trans_id
@@ -35,8 +34,8 @@ class CatchErrorsContext(WSGIContext):
         try:
             # catch any errors in the pipeline
             resp = self._app_call(env)
-        except (Exception, Timeout) as err:
-            self.logger.exception(_('Error: %s'), err)
+        except:  # noqa
+            self.logger.exception(_('Error: An error occurred'))
             resp = HTTPServerError(request=Request(env),
                                    body='An error occurred',
                                    content_type='text/plain')

test/unit/common/middleware/test_except.py

@@ -20,6 +20,10 @@ from swift.common.middleware import catch_errors
 from swift.common.utils import get_logger
 
 
+class StrangeException(BaseException):
+    pass
+
+
 class FakeApp(object):
 
     def __init__(self, error=False, body_iter=None):
@@ -30,6 +34,8 @@ class FakeApp(object):
         if 'swift.trans_id' not in env:
             raise Exception('Trans id should always be in env')
         if self.error:
+            if self.error == 'strange':
+                raise StrangeException('whoa')
             raise Exception('An error occurred')
         if self.body_iter is None:
             return ["FAKE APP"]
@@ -97,6 +103,12 @@ class TestCatchErrors(unittest.TestCase):
         app(req.environ, start_response)
         self.assertTrue(self.logger.txn_id.endswith('-stuff'))
 
+    def test_catcherrors_with_unexpected_error(self):
+        app = catch_errors.CatchErrorMiddleware(FakeApp(error='strange'), {})
+        req = Request.blank('/', environ={'REQUEST_METHOD': 'GET'})
+        resp = app(req.environ, start_response)
+        self.assertEquals(list(resp), ['An error occurred'])
+
 
 if __name__ == '__main__':
     unittest.main()