1 files changed, 141 insertions, 0 deletions
diff --git a/conf/__init__.py b/conf/__init__.py
new file mode 100644
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+++ b/conf/__init__.py
@@ -0,0 +1,141 @@
+# Copyright 2015 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.
+
+"""Settings and configuration handlers.
+
+Settings will be loaded from several .conf files
+and any user provided settings file.
+"""
+
+# pylint: disable=invalid-name
+
+import os
+import re
+import pprint
+
+class Settings(object):
+    """Holding class for settings.
+    """
+    def __init__(self):
+        pass
+
+    def getValue(self, attr):
+        """Return a settings item value
+        """
+        if attr in self.__dict__:
+            return getattr(self, attr)
+        else:
+            raise AttributeError("%r object has no attribute %r" %
+                                 (self.__class__, attr))
+
+    def __setattr__(self, name, value):
+        """Set a value
+        """
+        # skip non-settings. this should exclude built-ins amongst others
+        if not name.isupper():
+            return
+
+        # we can assume all uppercase keys are valid settings
+        super(Settings, self).__setattr__(name, value)
+
+    def load_from_file(self, path):
+        """Update ``settings`` with values found in module at ``path``.
+        """
+        import imp
+
+        custom_settings = imp.load_source('custom_settings', path)
+
+        for key in dir(custom_settings):
+            if getattr(custom_settings, key) is not None:
+                setattr(self, key, getattr(custom_settings, key))
+
+    def load_from_dir(self, dir_path):
+        """Update ``settings`` with contents of the .conf files at ``path``.
+
+        Each file must be named Nfilename.conf, where N is a single or
+        multi-digit decimal number.  The files are loaded in ascending order of
+        N - so if a configuration item exists in more that one file the setting
+        in the file with the largest value of N takes precedence.
+
+        :param dir_path: The full path to the dir from which to load the .conf
+            files.
+
+        :returns: None
+        """
+        regex = re.compile("^(?P<digit_part>[0-9]+).*.conf$")
+
+        def get_prefix(filename):
+            """
+            Provide a suitable function for sort's key arg
+            """
+            match_object = regex.search(os.path.basename(filename))
+            return int(match_object.group('digit_part'))
+
+        # get full file path to all files & dirs in dir_path
+        file_paths = os.listdir(dir_path)
+        file_paths = [os.path.join(dir_path, x) for x in file_paths]
+
+        # filter to get only those that are a files, with a leading
+        # digit and end in '.conf'
+        file_paths = [x for x in file_paths if os.path.isfile(x) and
+                      regex.search(os.path.basename(x))]
+
+        # sort ascending on the leading digits
+        file_paths.sort(key=get_prefix)
+
+        # load settings from each file in turn
+        for filepath in file_paths:
+            self.load_from_file(filepath)
+
+    def load_from_dict(self, conf):
+        """
+        Update ``settings`` with values found in ``conf``.
+
+        Unlike the other loaders, this is case insensitive.
+        """
+        for key in conf:
+            if conf[key] is not None:
+                setattr(self, key.upper(), conf[key])
+
+    def load_from_env(self):
+        """
+        Update ``settings`` with values found in the environment.
+        """
+        for key in os.environ:
+            setattr(self, key, os.environ[key])
+
+    def __str__(self):
+        """Provide settings as a human-readable string.
+
+        This can be useful for debug.
+
+        Returns:
+            A human-readable string.
+        """
+        return pprint.pformat(self.__dict__)
+
+
+settings = Settings()
+
+
+def get_test_param(key, default=None):
+    """Retrieve value for test param ``key`` if available.
+
+    :param key: Key to retrieve from test params.
+    :param default: Default to return if key not found.
+
+    :returns: Value for ``key`` if found, else ``default``.
+    """
+    test_params = settings.getValue('TEST_PARAMS')
+    return test_params.get(key, default) if test_params else default