Merge "use stevedore to load util plugins"

cinderclient/utils.py

@@ -15,13 +15,13 @@
 import collections
 
 import os
-import pkg_resources
 import sys
 import uuid
 
 import prettytable
 import six
 from six.moves.urllib import parse
+import stevedore
 
 from cinderclient import exceptions
 from oslo_utils import encodeutils
@@ -330,11 +330,16 @@ def safe_issubclass(*args):
 
 def _load_entry_point(ep_name, name=None):
     """Try to load the entry point ep_name that matches name."""
-    for ep in pkg_resources.iter_entry_points(ep_name, name=name):
-        try:
-            return ep.load()
-        except (ImportError, pkg_resources.UnknownExtra, AttributeError):
-            continue
+    mgr = stevedore.NamedExtensionManager(
+        namespace=ep_name,
+        names=[name],
+        # Ignore errors on load
+        on_load_failure_callback=lambda mgr, entry_point, error: None,
+    )
+    try:
+        return mgr[name].plugin
+    except KeyError:
+        pass
 
 
 def get_function_name(func):

requirements.txt

@@ -9,3 +9,4 @@ six>=1.10.0 # MIT
 oslo.i18n>=3.15.3 # Apache-2.0
 oslo.utils>=3.33.0 # Apache-2.0
 requests!=2.20.0,>=2.14.2  # Apache-2.0
+stevedore>=1.20.0 # Apache-2.0