Revert 182991

tools/telemetry/telemetry/test/discover.py

-# Copyright (c) 2012 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-import inspect
-import logging
-import os
-import traceback
-
-def Discover(start_dir, top_level_dir, suffix, clazz,
-             import_error_should_raise=False):
-  """Discover all classes in |start_dir| which subclass |clazz|.
-
-  Args:
-    start_dir: The directory to recursively search.
-    suffix: file name suffix for files to import, without the '.py' ending.
-    clazz: The base class to search for.
-    import_error_should_raise: If false, then import errors are logged but do
-      not stop discovery.
-
-  Returns:
-    dict of {module_name: class}.
-  """
-  classes = {}
-  for dirpath, _, filenames in os.walk(start_dir):
-    for filename in filenames:
-      if not filename.endswith(suffix + '.py'):
-        continue
-      name, _ = os.path.splitext(filename)
-      relpath = os.path.relpath(dirpath, top_level_dir)
-      fqn = relpath.replace('/', '.') + '.' + name
-      try:
-        module = __import__(fqn, fromlist=[True])
-      except Exception:
-        if import_error_should_raise:
-          raise
-        logging.error('While importing [%s]\n' % fqn)
-        traceback.print_exc()
-        continue
-      for name, obj in inspect.getmembers(module):
-        if inspect.isclass(obj):
-          if clazz in inspect.getmro(obj):
-            name = module.__name__.split('.')[-1]
-            classes[name] = obj
-  return classes