chrome/common/extensions/docs/server2/test_util.py

   1 # Copyright 2013 The Chromium Authors. All rights reserved.
   2 # Use of this source code is governed by a BSD-style license that can be
   3 # found in the LICENSE file.
   4
   5 from __future__ import print_function
   6
   7 from extensions_paths import SERVER2
   8 import logging
   9 import os
  10 import sys
  11
  12
  13 def CaptureLogging(f):
  14   '''Call the function |f|, capturing any logging output generated. |f| must
  15   take no arguments. Returns a list of LogRecords that were emitted.
  16   '''
  17   output = []
  18   class Capture(object):
  19     def filter(self, record):
  20       output.append(record)
  21
  22   cf = Capture()
  23   logging.getLogger('').addFilter(cf)
  24   f()
  25   logging.getLogger('').removeFilter(cf)
  26
  27   return output
  28
  29
  30 def EnableLogging(name):
  31   '''Returns the output of the log with |name| to stdout.
  32   '''
  33
  34   return _ReplaceLogging(name, lambda message, *args: print(message % args))
  35
  36
  37 def DisableLogging(name):
  38   '''Disables the log with |name| for the duration of the decorated function.
  39   '''
  40   return _ReplaceLogging(name, lambda _, *args: None)
  41
  42
  43 def _ReplaceLogging(name, replacement):
  44   def decorator(fn):
  45     def impl(*args, **optargs):
  46       saved = getattr(logging, name)
  47       setattr(logging, name, replacement)
  48       try:
  49         return fn(*args, **optargs)
  50       finally:
  51         setattr(logging, name, saved)
  52     return impl
  53   return decorator
  54
  55
  56 def ChromiumPath(*path):
  57   abspath = os.path.join(
  58       sys.path[0], '..', '..', '..', '..', '..', *path)
  59   # os.path.relpath kills any trailing '/'.
  60   return os.path.relpath(abspath) + ('/' if abspath.endswith('/') else '')
  61
  62
  63 def Server2Path(*path):
  64   return ChromiumPath(SERVER2, *path)
  65
  66
  67 def ReadFile(*path, **read_args):
  68   with open(ChromiumPath(*path), **read_args) as f:
  69     return f.read()