add a logging module to configure structlog

teeth_agent/logging.py

@@ -0,0 +1,44 @@
+"""
+Copyright 2013 Rackspace, Inc.
+
+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 traceback
+
+import structlog
+
+EXCEPTION_LOG_METHODS = ['error']
+
+
+def _capture_stack_trace(logger, method, event):
+    if method in EXCEPTION_LOG_METHODS:
+        event['exception'] = traceback.format_exc()
+
+    return event
+
+
+def configure(pretty=False):
+    processors = [
+        _capture_stack_trace,
+    ]
+
+    if pretty:
+        processors.append(structlog.processors.ExceptionPrettyPrinter())
+        processors.append(structlog.processors.KeyValueRenderer())
+    else:
+        processors.append(structlog.processors.JSONRenderer())
+
+    structlog.configure(
+        processors=processors
+    )