Intiial utils push to ONAP

Issue-Id: DCAEGEN2-80
Change-Id: I1dc8f2d384b0af346fccb86e6767b7e3ca484078
Signed-off-by: Tommy Carpenter <tommy@research.att.com>

1 files changed, 78 insertions, 0 deletions

diff --git a/python-discovery-client/discovery_client/util.py b/python-discovery-client/discovery_client/util.py
new file mode 100644
index 0000000..b59647a
--- /dev/null
+++ b/python-discovery-client/discovery_client/util.py
@@ -0,0 +1,78 @@
+# org.onap.dcae
+# ================================================================================
+# Copyright (c) 2017 AT&T Intellectual Property. All rights reserved.
+# ================================================================================
+# 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.
+# ============LICENSE_END=========================================================
+#
+# ECOMP is a trademark and service mark of AT&T Intellectual Property.
+
+import collections
+import logging, sys
+import six
+
+#####
+# Module contains utility methods
+#####
+
+def update_json(src, key, value):
+    """Updates a nested JSON value
+
+    This method does a recursive lookup for a value given a compound key and then
+    replaces that value with the passed in new value.
+
+    For example, given a src json { "a": [ { "aa": 1 }, "foo" ], "b": "2 } and a
+    key ("a", 0, "aa"), the value parameter would replace 1.
+
+    :param src: json to update
+    :type src: dict or list
+    :param key: compound key used to lookup
+    :type key: tuple
+    :param value: new value used to replace
+    :type value: object
+
+    :return: updated json
+    """
+    if key:
+        src[key[0]] = update_json(src[key[0]], key[1:], value)
+    else:
+        # We've found the value we want to replace regardless of whether or not
+        # the object we are replacing is another copmlicated data structure.
+        src = value
+    return src
+
+def _has_handlers(logger):
+    """Check if logger has handlers"""
+    if six.PY3:
+        return logger.hasHandlers()
+    else:
+        # TODO: Not sure how to check if a handler has already been attached
+        # WATCH: Downside is lines get printed multiple times
+        return False
+
+def get_logger(name, level=logging.INFO):
+    """Get a logger with sensible defaults
+
+    This method returns a logger from logging by name that has been set with sensible
+    defaults if the logger hasn't already been setup with any handlers. The
+    default handler is a stream handler to stdout.
+    """
+    logger = logging.getLogger(name)
+
+    if not _has_handlers(logger):
+        # No handlers attached which means logging hasn't been setup. Set
+        # "sensible" defaults which means stdout, INFO
+        logger.setLevel(level)
+        logger.addHandler(logging.StreamHandler(stream=sys.stdout))
+
+    return logger