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() 70
