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-rw-r--r--pylog/onaplogging/logWatchDog.py95
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diff --git a/pylog/onaplogging/logWatchDog.py b/pylog/onaplogging/logWatchDog.py
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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 as e:
+ traceback.print_exc(e)
+ 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 as e:
+ traceback.print_exc(e)
+
+
+def patch_loggingYaml():
+
+ # The patch to add yam config forlogginf and runtime
+ # reload logging when modify yaml file
+ config.yamlConfig = _yamlConfig