Add backward compatible drivers structure

Change-Id: I3e904d0e456aa6999cd9a02a268f54e6d8b729de
Spec: Multi backend support

3 files changed, 4 insertions, 28 deletions

diff --git a/osprofiler/cmd/commands.py b/osprofiler/cmd/commands.py
index b2700b6..b369c23 100644
--- a/osprofiler/cmd/commands.py
+++ b/osprofiler/cmd/commands.py
@@ -17,7 +17,7 @@ import json
 import os
 
 from osprofiler.cmd import cliutils
-from osprofiler.cmd import exc
+from osprofiler import exc
 from osprofiler.parsers import ceilometer as ceiloparser
 
 
@@ -90,4 +90,4 @@ class TraceCommands(BaseCommand):
             with open(args.file_name, "w+") as output_file:
                 output_file.write(output)
         else:
-            print (output)
+            print(output)
diff --git a/osprofiler/cmd/exc.py b/osprofiler/cmd/exc.py
deleted file mode 100644
index 0ffc9c9..0000000
--- a/osprofiler/cmd/exc.py
+++ /dev/null
@@ -1,24 +0,0 @@
-# Copyright 2014 Mirantis Inc.
-# 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.
-
-
-class CommandError(Exception):
-    """Invalid usage of CLI."""
-
-    def __init__(self, message=None):
-        self.message = message
-
-    def __str__(self):
-        return self.message or self.__class__.__doc__
diff --git a/osprofiler/cmd/shell.py b/osprofiler/cmd/shell.py
index e613a90..ca7dc95 100644
--- a/osprofiler/cmd/shell.py
+++ b/osprofiler/cmd/shell.py
@@ -26,7 +26,7 @@ import argparse
 import osprofiler
 from osprofiler.cmd import cliutils
 from osprofiler.cmd import commands
-from osprofiler.cmd import exc
+from osprofiler import exc
 
 
 class OSProfilerShell(object):
@@ -235,7 +235,7 @@ def main(args=None):
     try:
         OSProfilerShell(args)
     except exc.CommandError as e:
-        print (e.message)
+        print(e.message)
         return 1