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# Copyright (c) 2018 VMware, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
import os
import yaml
import traceback
from logging import config
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler
__all__ = ['patch_loggingYaml']
def _yaml2Dict(filename):
with open(filename, 'rt') as f:
return yaml.load(f.read())
class FileEventHandlers(FileSystemEventHandler):
def __init__(self, filepath):
FileSystemEventHandler.__init__(self)
self.filepath = filepath
self.currentConfig = None
def on_modified(self, event):
try:
if event.src_path == self.filepath:
newConfig = _yaml2Dict(self.filepath)
print("reload logging configure file %s" % event.src_path)
config.dictConfig(newConfig)
self.currentConfig = newConfig
except Exception:
traceback.print_exc()
print("Reuse the old configuration to avoid this"
"exception terminate program")
if self.currentConfig:
config.dictConfig(self.currentConfig)
def _yamlConfig(filepath=None, watchDog=None):
"""
load logging configureation from yaml file and monitor file status
:param filepath: logging yaml configure file absolute path
:param watchDog: monitor yaml file identifier status
:return:
"""
if os.path.isfile(filepath) is False:
raise OSError("wrong file")
dirpath = os.path.dirname(filepath)
event_handler = None
try:
dictConfig = _yaml2Dict(filepath)
# The watchdog could monitor yaml file status,if be modified
# will send a notify then we could reload logging configuration
if watchDog:
observer = Observer()
event_handler = FileEventHandlers(filepath)
observer.schedule(event_handler=event_handler, path=dirpath,
recursive=False)
observer.setDaemon(True)
observer.start()
config.dictConfig(dictConfig)
if event_handler:
# here we keep the correct configuration for reusing
event_handler.currentConfig = dictConfig
except Exception:
traceback.print_exc()
def patch_loggingYaml():
# The patch to add yam config forlogginf and runtime
# reload logging when modify yaml file
config.yamlConfig = _yamlConfig
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