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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 logging
import threading
import os
import sys
import functools
__all__ = ['patch_loggingMDC', 'MDC']
_replace_func_name = ['info', 'critical', 'fatal', 'debug',
'error', 'warn', 'warning', 'findCaller']
class MDCContext(threading.local):
"""
A Thread local instance to storage mdc values
"""
def __init__(self):
super(MDCContext, self).__init__()
self._localDict = {}
def get(self, key):
return self._localDict.get(key, None)
def put(self, key, value):
self._localDict[key] = value
def remove(self, key):
if key in self.localDict:
del self._localDict[key]
def clear(self):
self._localDict.clear()
def result(self):
return self._localDict
def isEmpty(self):
return self._localDict == {} or self._localDict is None
MDC = MDCContext()
def fetchkeys(func):
@functools.wraps(func)
def replace(*args, **kwargs):
kwargs['extra'] = _getmdcs(extra=kwargs.get('extra', None))
func(*args, **kwargs)
return replace
def _getmdcs(extra=None):
"""
Put mdc dict in logging record extra filed with key 'mdc'
:param extra: dict
:return: mdc dict
"""
if MDC.isEmpty():
return
mdc = MDC.result()
if extra is not None:
for key in extra:
# make sure extra key dosen't override mdckey
if key in mdc or key == 'mdc':
raise KeyError("Attempt to overwrite %r in MDC" % key)
else:
extra = {}
extra['mdc'] = mdc
del mdc
return extra
@fetchkeys
def info(self, msg, *args, **kwargs):
if self.isEnabledFor(logging.INFO):
self._log(logging.INFO, msg, args, **kwargs)
@fetchkeys
def debug(self, msg, *args, **kwargs):
if self.isEnabledFor(logging.DEBUG):
self._log(logging.DEBUG, msg, args, **kwargs)
@fetchkeys
def warning(self, msg, *args, **kwargs):
if self.isEnabledFor(logging.WARNING):
self._log(logging.WARNING, msg, args, **kwargs)
@fetchkeys
def exception(self, msg, *args, **kwargs):
kwargs['exc_info'] = 1
self.error(msg, *args, **kwargs)
@fetchkeys
def critical(self, msg, *args, **kwargs):
if self.isEnabledFor(logging.CRITICAL):
self._log(logging.CRITICAL, msg, args, **kwargs)
@fetchkeys
def error(self, msg, *args, **kwargs):
if self.isEnabledFor(logging.ERROR):
self._log(logging.ERROR, msg, args, **kwargs)
def findCaller(self):
f = logging.currentframe()
if f is not None:
f = f.f_back
rv = "(unkown file)", 0, "(unknow function)"
while hasattr(f, "f_code"):
co = f.f_code
filename = os.path.normcase(co.co_filename)
# jump through local 'replace' func frame
if filename == logging._srcfile or co.co_name == "replace":
f = f.f_back
continue
rv = (co.co_filename, f.f_lineno, co.co_name)
break
return rv
def patch_loggingMDC():
"""
The patch to add MDC ability in logging Record instance at runtime
"""
localModule = sys.modules[__name__]
for attr in dir(logging.Logger):
if attr in _replace_func_name:
newfunc = getattr(localModule, attr, None)
if newfunc:
setattr(logging.Logger, attr, newfunc)
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