1# Copyright (c) 2009, Google Inc. All rights reserved. 2# Copyright (c) 2009 Apple Inc. All rights reserved. 3# 4# Redistribution and use in source and binary forms, with or without 5# modification, are permitted provided that the following conditions are 6# met: 7# 8# * Redistributions of source code must retain the above copyright 9# notice, this list of conditions and the following disclaimer. 10# * Redistributions in binary form must reproduce the above 11# copyright notice, this list of conditions and the following disclaimer 12# in the documentation and/or other materials provided with the 13# distribution. 14# * Neither the name of Google Inc. nor the names of its 15# contributors may be used to endorse or promote products derived from 16# this software without specific prior written permission. 17# 18# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 30import codecs 31import os 32import sys 33 34 35# Simple class to split output between multiple destinations 36class Tee: 37 def __init__(self, *files): 38 self.files = files 39 40 # Callers should pass an already encoded string for writing. 41 def write(self, bytes): 42 for file in self.files: 43 file.write(bytes) 44 45 46class OutputTee: 47 def __init__(self): 48 self._original_stdout = None 49 self._original_stderr = None 50 self._files_for_output = [] 51 52 def add_log(self, path): 53 log_file = self._open_log_file(path) 54 self._files_for_output.append(log_file) 55 self._tee_outputs_to_files(self._files_for_output) 56 return log_file 57 58 def remove_log(self, log_file): 59 self._files_for_output.remove(log_file) 60 self._tee_outputs_to_files(self._files_for_output) 61 log_file.close() 62 63 @staticmethod 64 def _open_log_file(log_path): 65 (log_directory, log_name) = os.path.split(log_path) 66 if log_directory and not os.path.exists(log_directory): 67 os.makedirs(log_directory) 68 return codecs.open(log_path, "a+", "utf-8") 69 70 def _tee_outputs_to_files(self, files): 71 if not self._original_stdout: 72 self._original_stdout = sys.stdout 73 self._original_stderr = sys.stderr 74 if files and len(files): 75 sys.stdout = Tee(self._original_stdout, *files) 76 sys.stderr = Tee(self._original_stderr, *files) 77 else: 78 sys.stdout = self._original_stdout 79 sys.stderr = self._original_stderr 80