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# 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. See the
# License for the specific language governing permissions and limitations
# under the License.
import datetime
import debtcollector
import functools
import itertools
import logging
import logging.config
import logging.handlers
import re
import socket
import sys
import traceback
from dateutil import tz
import six
from six import moves
from oslo_context import context as context_utils
from oslo_serialization import jsonutils
from oslo_utils import encodeutils
if six.PY3:
from functools import reduce
try:
# Test if to_primitive() has the fallback parameter added
# in oslo.serialization 2.21.1
jsonutils.to_primitive(1, fallback=repr)
_HAVE_JSONUTILS_FALLBACK = True
except TypeError:
_HAVE_JSONUTILS_FALLBACK = False
def _dictify_context(context):
if getattr(context, 'get_logging_values', None):
return context.get_logging_values()
elif getattr(context, 'to_dict', None):
debtcollector.deprecate(
'The RequestContext.get_logging_values() '
'method should be defined for logging context specific '
'information. The to_dict() method is deprecated '
'for oslo.log use.', version='3.8.0', removal_version='5.0.0')
return context.to_dict()
# This dict only style logging format will become deprecated
# when projects using a dictionary object for context are updated
elif isinstance(context, dict):
return context
return {}
# A configuration object is given to us when the application registers
# the logging options.
_CONF = None
def _store_global_conf(conf):
global _CONF
_CONF = conf
def _update_record_with_context(record):
"""Given a log record, update it with context information.
The request context, if there is one, will either be passed with the
incoming record or in the global thread-local store.
"""
context = record.__dict__.get(
'context',
context_utils.get_current()
)
if context:
d = _dictify_context(context)
# Copy the context values directly onto the record so they can be
# used by the formatting strings.
for k, v in d.items():
setattr(record, k, v)
return context
def _ensure_unicode(msg):
"""Do our best to turn the input argument into a unicode object.
"""
if isinstance(msg, six.text_type):
return msg
if not isinstance(msg, six.binary_type):
return six.text_type(msg)
return encodeutils.safe_decode(
msg,
incoming='utf-8',
errors='xmlcharrefreplace')
def _get_error_summary(record):
"""Return the error summary
If there is no active exception, return the default.
If the record is being logged below the warning level, return an
empty string.
If there is an active exception, format it and return the
resulting string.
"""
error_summary = ''
if record.levelno < logging.WARNING:
return ''
if record.exc_info:
# Save the exception we were given so we can include the
# summary in the log line.
exc_info = record.exc_info
else:
# Check to see if there is an active exception that was
# not given to us explicitly. If so, save it so we can
# include the summary in the log line.
exc_info = sys.exc_info()
# If we get (None, None, None) because there is no
# exception, convert it to a simple None to make the logic
# that uses the value simpler.
if not exc_info[0]:
exc_info = None
elif exc_info[0] in (TypeError, ValueError,
KeyError, AttributeError, ImportError):
# NOTE(dhellmann): Do not include information about
# common built-in exceptions used to detect cases of
# bad or missing data. We don't use isinstance() here
# to limit this filter to only the built-in
# classes. This check is only performed for cases
# where the exception info is being detected
# automatically so if a caller gives us an exception
# we will definitely log it.
exc_info = None
# If we have an exception, format it to be included in the
# output.
if exc_info:
try:
# Build the exception summary in the line with the
# primary log message, to serve as a mnemonic for error
# and warning cases.
error_summary = traceback.format_exception_only(
exc_info[0],
exc_info[1],
)[0].rstrip()
# If the exc_info wasn't explicitly passed to us, take only the
# first line of it. _Remote exceptions from oslo.messaging append
# the full traceback to the exception message, so we want to avoid
# outputting the traceback unless we've been passed exc_info
# directly (via LOG.exception(), for example).
if not record.exc_info:
error_summary = error_summary.split('\n', 1)[0]
except TypeError as type_err:
# Work around https://bugs.python.org/issue28603
error_summary = "<exception with %s>" % six.text_type(type_err)
finally:
# Remove the local reference to the exception and
# traceback to avoid a memory leak through the frame
# references.
del exc_info
return error_summary
class _ReplaceFalseValue(dict):
def __getitem__(self, key):
return dict.get(self, key, None) or '-'
_MSG_KEY_REGEX = re.compile(r'(%+)\((\w+)\)')
def _json_dumps_with_fallback(obj):
if _HAVE_JSONUTILS_FALLBACK:
# Bug #1593641: If an object cannot be serialized to JSON, convert
# it using repr() to prevent serialization errors. Using repr() is
# not ideal, but serialization errors are unexpected on logs,
# especially when the code using logs is not aware that the
# JSONFormatter will be used.
convert = functools.partial(jsonutils.to_primitive, fallback=repr)
return jsonutils.dumps(obj, default=convert)
else:
return jsonutils.dumps(obj)
class JSONFormatter(logging.Formatter):
def __init__(self, fmt=None, datefmt=None, style='%'):
# NOTE(sfinucan) we ignore the fmt and style arguments, but they're
# still there since logging.config.fileConfig passes the former in
# Python < 3.2 and both in Python >= 3.2
self.datefmt = datefmt
try:
self.hostname = socket.gethostname()
except socket.error:
self.hostname = None
def formatException(self, ei, strip_newlines=True):
try:
lines = traceback.format_exception(*ei)
except TypeError as type_error:
# Work around https://bugs.python.org/issue28603
msg = six.text_type(type_error)
lines = ['<Unprintable exception due to %s>\n' % msg]
if strip_newlines:
lines = [moves.filter(
lambda x: x,
line.rstrip().splitlines()) for line in lines]
lines = list(itertools.chain(*lines))
return lines
def format(self, record):
args = record.args
if isinstance(args, dict):
msg_keys = _MSG_KEY_REGEX.findall(record.msg)
# NOTE(bnemec): The logic around skipping escaped placeholders is
# tricky and error-prone to include in the regex. Much easier to
# just grab them all and filter after the fact.
msg_keys = [m[1] for m in msg_keys if len(m[0]) == 1]
# If no named keys were found, then the entire dict must have been
# the value to be formatted. Don't filter anything.
if msg_keys:
args = {k: v for k, v in args.items() if k in msg_keys}
message = {'message': record.getMessage(),
'asctime': self.formatTime(record, self.datefmt),
'name': record.name,
'msg': record.msg,
'args': args,
'levelname': record.levelname,
'levelno': record.levelno,
'pathname': record.pathname,
'filename': record.filename,
'module': record.module,
'lineno': record.lineno,
'funcname': record.funcName,
'created': record.created,
'msecs': record.msecs,
'relative_created': record.relativeCreated,
'thread': record.thread,
'thread_name': record.threadName,
'process_name': record.processName,
'process': record.process,
'traceback': None,
'hostname': self.hostname,
'error_summary': _get_error_summary(record)}
# Build the extra values that were given to us, including
# the context.
context = _update_record_with_context(record)
if hasattr(record, 'extra'):
extra = record.extra.copy()
else:
extra = {}
for key in getattr(record, 'extra_keys', []):
if key not in extra:
extra[key] = getattr(record, key)
# The context object might have been given from the logging call. if
# that was the case, it'll come in the 'extra' entry already. If not,
# lets use the context we fetched above. In either case, we explode it
# into the 'context' entry because the values are more useful than the
# object reference.
if 'context' in extra and extra['context']:
message['context'] = _dictify_context(extra['context'])
elif context:
message['context'] = _dictify_context(context)
else:
message['context'] = {}
extra.pop('context', None)
message['extra'] = extra
if record.exc_info:
message['traceback'] = self.formatException(record.exc_info)
return _json_dumps_with_fallback(message)
class FluentFormatter(logging.Formatter):
"""A formatter for fluentd.
format() returns dict, not string.
It expects to be used by fluent.handler.FluentHandler.
(included in fluent-logger-python)
.. versionadded:: 3.17
"""
def __init__(self, fmt=None, datefmt=None, style='%s'):
# NOTE(sfinucan) we ignore the fmt and style arguments for the same
# reason as JSONFormatter.
self.datefmt = datefmt
try:
self.hostname = socket.gethostname()
except socket.error:
self.hostname = None
self.cmdline = " ".join(sys.argv)
def formatException(self, exc_info, strip_newlines=True):
try:
lines = traceback.format_exception(*exc_info)
except TypeError as type_error:
# Work around https://bugs.python.org/issue28603
msg = six.text_type(type_error)
lines = ['<Unprintable exception due to %s>\n' % msg]
if strip_newlines:
lines = reduce(lambda a, line: a + line.rstrip().splitlines(),
lines, [])
return lines
def format(self, record):
message = {'message': record.getMessage(),
'time': self.formatTime(record, self.datefmt),
'name': record.name,
'level': record.levelname,
'filename': record.filename,
'lineno': record.lineno,
'module': record.module,
'funcname': record.funcName,
'process_name': record.processName,
'cmdline': self.cmdline,
'hostname': self.hostname,
'traceback': None,
'error_summary': _get_error_summary(record)}
# Build the extra values that were given to us, including
# the context.
context = _update_record_with_context(record)
if hasattr(record, 'extra'):
extra = record.extra.copy()
else:
extra = {}
for key in getattr(record, 'extra_keys', []):
if key not in extra:
extra[key] = getattr(record, key)
# The context object might have been given from the logging call. if
# that was the case, it'll come in the 'extra' entry already. If not,
# lets use the context we fetched above. In either case, we explode it
# into the extra dictionary because the values are more useful than the
# object reference.
if 'context' in extra and extra['context']:
message['context'] = _dictify_context(extra['context'])
elif context:
message['context'] = _dictify_context(context)
else:
message['context'] = {}
extra.pop('context', None)
# NOTE(vdrok): try to dump complex objects
primitive_types = six.string_types + six.integer_types + (
bool, type(None), float, list, dict)
for key, value in extra.items():
if not isinstance(value, primitive_types):
extra[key] = _json_dumps_with_fallback(value)
message['extra'] = extra
if record.exc_info:
message['traceback'] = self.formatException(record.exc_info)
return message
class ContextFormatter(logging.Formatter):
"""A context.RequestContext aware formatter configured through flags.
The flags used to set format strings are: logging_context_format_string
and logging_default_format_string. You can also specify
logging_debug_format_suffix to append extra formatting if the log level is
debug.
The standard variables available to the formatter are listed at:
http://docs.python.org/library/logging.html#formatter
In addition to the standard variables, one custom variable is
available to both formatting string: `isotime` produces a
timestamp in ISO8601 format, suitable for producing
RFC5424-compliant log messages.
Furthermore, logging_context_format_string has access to all of
the data in a dict representation of the context.
"""
def __init__(self, *args, **kwargs):
"""Initialize ContextFormatter instance
Takes additional keyword arguments which can be used in the message
format string.
:keyword project: project name
:type project: string
:keyword version: project version
:type version: string
"""
self.project = kwargs.pop('project', 'unknown')
self.version = kwargs.pop('version', 'unknown')
self.conf = kwargs.pop('config', _CONF)
logging.Formatter.__init__(self, *args, **kwargs)
def format(self, record):
"""Uses contextstring if request_id is set, otherwise default."""
if six.PY2:
should_use_unicode = True
args = (record.args.values() if isinstance(record.args, dict)
else record.args)
for arg in args or []:
try:
six.text_type(arg)
except UnicodeDecodeError:
should_use_unicode = False
break
if (not isinstance(record.msg, six.text_type)
and should_use_unicode):
record.msg = _ensure_unicode(record.msg)
# store project info
record.project = self.project
record.version = self.version
# FIXME(dims): We need a better way to pick up the instance
# or instance_uuid parameters from the kwargs from say
# LOG.info or LOG.warn
instance_extra = ''
instance = getattr(record, 'instance', None)
instance_uuid = getattr(record, 'instance_uuid', None)
context = _update_record_with_context(record)
if instance:
try:
instance_extra = (self.conf.instance_format
% instance)
except TypeError:
instance_extra = instance
elif instance_uuid:
instance_extra = (self.conf.instance_uuid_format
% {'uuid': instance_uuid})
elif context:
# FIXME(dhellmann): We should replace these nova-isms with
# more generic handling in the Context class. See the
# app-agnostic-logging-parameters blueprint.
instance = getattr(context, 'instance', None)
instance_uuid = getattr(context, 'instance_uuid', None)
# resource_uuid was introduced in oslo_context's
# RequestContext
resource_uuid = getattr(context, 'resource_uuid', None)
if instance:
instance_extra = (self.conf.instance_format
% {'uuid': instance})
elif instance_uuid:
instance_extra = (self.conf.instance_uuid_format
% {'uuid': instance_uuid})
elif resource_uuid:
instance_extra = (self.conf.instance_uuid_format
% {'uuid': resource_uuid})
record.instance = instance_extra
# NOTE(sdague): default the fancier formatting params
# to an empty string so we don't throw an exception if
# they get used
for key in ('instance', 'color', 'user_identity', 'resource',
'user_name', 'project_name'):
if key not in record.__dict__:
record.__dict__[key] = ''
# Set the "user_identity" value of "logging_context_format_string"
# by using "logging_user_identity_format" and
# get_logging_values of oslo.context.
if context:
record.user_identity = (
self.conf.logging_user_identity_format %
_ReplaceFalseValue(_dictify_context(context))
)
if record.__dict__.get('request_id'):
fmt = self.conf.logging_context_format_string
else:
fmt = self.conf.logging_default_format_string
# Cache the formatted traceback on the record, Logger will
# respect our formatted copy
if record.exc_info:
record.exc_text = self.formatException(record.exc_info, record)
record.error_summary = _get_error_summary(record)
if '%(error_summary)s' in fmt:
# If we have been told explicitly how to format the error
# summary, make sure there is always a default value for
# it.
record.error_summary = record.error_summary or '-'
elif record.error_summary:
# If we have not been told how to format the error and
# there is an error to summarize, make sure the format
# string includes the bits we need to include it.
fmt += ': %(error_summary)s'
if (record.levelno == logging.DEBUG and
self.conf.logging_debug_format_suffix):
fmt += " " + self.conf.logging_debug_format_suffix
self._compute_iso_time(record)
if sys.version_info < (3, 2):
self._fmt = fmt
else:
self._style = logging.PercentStyle(fmt)
self._fmt = self._style._fmt
try:
return logging.Formatter.format(self, record)
except TypeError as err:
# Something went wrong, report that instead so we at least
# get the error message.
record.msg = 'Error formatting log line msg={!r} err={!r}'.format(
record.msg, err).replace('%', '*')
return logging.Formatter.format(self, record)
def formatException(self, exc_info, record=None):
"""Format exception output with CONF.logging_exception_prefix."""
if not record:
try:
return logging.Formatter.formatException(self, exc_info)
except TypeError as type_error:
# Work around https://bugs.python.org/issue28603
msg = six.text_type(type_error)
return '<Unprintable exception due to %s>\n' % msg
stringbuffer = moves.StringIO()
try:
traceback.print_exception(exc_info[0], exc_info[1], exc_info[2],
None, stringbuffer)
except TypeError as type_error:
# Work around https://bugs.python.org/issue28603
msg = six.text_type(type_error)
stringbuffer.write('<Unprintable exception due to %s>\n' % msg)
lines = stringbuffer.getvalue().split('\n')
stringbuffer.close()
if self.conf.logging_exception_prefix.find('%(asctime)') != -1:
record.asctime = self.formatTime(record, self.datefmt)
self._compute_iso_time(record)
formatted_lines = []
for line in lines:
pl = self.conf.logging_exception_prefix % record.__dict__
fl = '%s%s' % (pl, line)
formatted_lines.append(fl)
return '\n'.join(formatted_lines)
def _compute_iso_time(self, record):
# set iso8601 timestamp
localtz = tz.tzlocal()
record.isotime = datetime.datetime.fromtimestamp(
record.created).replace(tzinfo=localtz).isoformat()
if record.created == int(record.created):
# NOTE(stpierre): when the timestamp includes no
# microseconds -- e.g., 1450274066.000000 -- then the
# microseconds aren't included in the isoformat() time. As
# a result, in literally one in a million cases
# isoformat() looks different. This adds microseconds when
# that happens.
record.isotime = "%s.000000%s" % (record.isotime[:-6],
record.isotime[-6:])
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