Only log error when no load handler is set0.15

Only log an error from loading a plugin if no load
failure handler callback is provided. Otherwise,
assume the handler will do any logging it wants.

Change-Id: Iac83f3c140067bc3d1996c40c0184e4a0d0b564a

1 files changed, 3 insertions, 2 deletions

diff --git a/stevedore/extension.py b/stevedore/extension.py
index 2dd22c7..0f227a3 100644
--- a/stevedore/extension.py
+++ b/stevedore/extension.py
@@ -166,10 +166,11 @@ class ExtensionManager(object):
             except (KeyboardInterrupt, AssertionError):
                 raise
             except Exception as err:
-                LOG.error('Could not load %r: %s', ep.name, err)
-                LOG.exception(err)
                 if self._on_load_failure_callback is not None:
                     self._on_load_failure_callback(self, ep, err)
+                else:
+                    LOG.error('Could not load %r: %s', ep.name, err)
+                    LOG.exception(err)
         return extensions
 
     def _load_one_plugin(self, ep, invoke_on_load, invoke_args, invoke_kwds,