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# Copyright 2020 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Creates and manages log file objects.
Provides an object that handles opening and closing file streams for
logging purposes.
"""
import os
class LogManager(object):
def __init__(self, logs_dir):
# A dictionary with the log file path as the key and a file stream as value.
self._logs = {}
self._logs_dir = logs_dir
if self._logs_dir:
if not os.path.isdir(self._logs_dir):
os.makedirs(self._logs_dir)
def IsLoggingEnabled(self):
return self._logs_dir is not None
def GetLogDirectory(self):
"""Get the directory logs are placed into."""
return self._logs_dir
def Open(self, log_file_name):
"""Open a file stream with log_file_name in the logs directory."""
parent_dir = self.GetLogDirectory()
if not parent_dir:
return open(os.devnull, 'w')
log_file_path = os.path.join(parent_dir, log_file_name)
if log_file_path in self._logs:
return self._logs[log_file_path]
log_file = open(log_file_path, 'w', buffering=1)
self._logs[log_file_path] = log_file
return log_file
def Stop(self):
for log in self._logs.values():
log.close()
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, traceback):
self.Stop()
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