Prohibit the importation of a list of libraries

Some modules can't be imported and used in Yardstick. For example,
"ansible" has GPLv3 license and can't be used as a library in this
project without modifying Yardstick license.

JIRA: YARDSTICK-896

Change-Id: I9d6bec0493ac50f1051235cc77e81059dfc3e01c
Signed-off-by: Rodolfo Alonso Hernandez <rodolfo.alonso.hernandez@intel.com>

2 files changed, 36 insertions, 0 deletions

diff --git a/yardstick/common/exceptions.py b/yardstick/common/exceptions.py
index e38dd246c..8e6077b04 100644
--- a/yardstick/common/exceptions.py
+++ b/yardstick/common/exceptions.py
@@ -59,6 +59,11 @@ class FunctionNotImplemented(YardstickException):
                '"%(class_name)" class.')
 
 
+class YardstickBannedModuleImported(YardstickException):
+    # pragma: no cover
+    message = 'Module "%(module)s" cannnot be imported. Reason: "%(reason)s"'
+
+
 class HeatTemplateError(YardstickException):
     """Error in Heat during the stack deployment"""
     message = ('Error in Heat during the creation of the OpenStack stack '
diff --git a/yardstick/common/import_tools.py b/yardstick/common/import_tools.py
new file mode 100644
index 000000000..bf8dc7e07
--- /dev/null
+++ b/yardstick/common/import_tools.py
@@ -0,0 +1,31 @@
+# Copyright (c) 2018 Intel Corporation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import sys
+
+from yardstick.common import exceptions
+
+
+BANNED_MODULES = {'ansible': 'Module with GPLv3 license'}
+
+
+def decorator_banned_modules(cls):
+    def _class(*args, **kwargs):
+        for module in sys.modules:
+            for banned_module, reason in BANNED_MODULES.items():
+                if module.startswith(banned_module):
+                    raise exceptions.YardstickBannedModuleImported(
+                        module=banned_module, reason=reason)
+        return cls(*args, **kwargs)
+    return _class