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#
30# WebKit's Python module for logging
31# This module is now deprecated in favor of python's built-in logging.py.
32
33import codecs
34import os
35import sys
36
37
38def log(string):
39    print >> sys.stderr, string
40
41
42def error(string):
43    log("ERROR: %s" % string)
44    exit(1)
45
46
47# Simple class to split output between multiple destinations
48class tee:
49    def __init__(self, *files):
50        self.files = files
51
52    # Callers should pass an already encoded string for writing.
53    def write(self, bytes):
54        for file in self.files:
55            file.write(bytes)
56
57
58class OutputTee:
59    def __init__(self):
60        self._original_stdout = None
61        self._original_stderr = None
62        self._files_for_output = []
63
64    def add_log(self, path):
65        log_file = self._open_log_file(path)
66        self._files_for_output.append(log_file)
67        self._tee_outputs_to_files(self._files_for_output)
68        return log_file
69
70    def remove_log(self, log_file):
71        self._files_for_output.remove(log_file)
72        self._tee_outputs_to_files(self._files_for_output)
73        log_file.close()
74
75    @staticmethod
76    def _open_log_file(log_path):
77        (log_directory, log_name) = os.path.split(log_path)
78        if log_directory and not os.path.exists(log_directory):
79            os.makedirs(log_directory)
80        return codecs.open(log_path, "a+", "utf-8")
81
82    def _tee_outputs_to_files(self, files):
83        if not self._original_stdout:
84            self._original_stdout = sys.stdout
85            self._original_stderr = sys.stderr
86        if files and len(files):
87            sys.stdout = tee(self._original_stdout, *files)
88            sys.stderr = tee(self._original_stderr, *files)
89        else:
90            sys.stdout = self._original_stdout
91            sys.stderr = self._original_stderr
92