1 # Copyright 2017 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 """Logging util functions. 5 6 It would be named logging, but other modules in this directory use the default 7 logging module, so that would break them. 8 """ 9 10 import contextlib 11 import logging 12 13 @contextlib.contextmanager 14 def CaptureLogs(file_stream): 15 if not file_stream: 16 # No file stream given, just don't capture logs. 17 yield 18 return 19 20 fh = logging.StreamHandler(file_stream) 21 22 logger = logging.getLogger() 23 # Try to copy the current log format, if one is set. 24 if logger.handlers and hasattr(logger.handlers[0], 'formatter'): 25 fh.formatter = logger.handlers[0].formatter 26 else: 27 fh.setFormatter(logging.Formatter( 28 '(%(levelname)s) %(asctime)s %(message)s')) 29 logger.addHandler(fh) 30 31 try: 32 yield 33 finally: 34 logger = logging.getLogger() 35 logger.removeHandler(fh) 36
