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# Copyright 2017 New Vector Ltd
#
# 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 logging
import traceback
from io import StringIO
from types import TracebackType
from typing import Optional, Tuple, Type
class LogFormatter(logging.Formatter):
"""Log formatter which gives more detail for exceptions
This is the same as the standard log formatter, except that when logging
exceptions [typically via log.foo("msg", exc_info=1)], it prints the
sequence that led up to the point at which the exception was caught.
(Normally only stack frames between the point the exception was raised and
where it was caught are logged).
"""
def formatException(
self,
ei: Tuple[
Optional[Type[BaseException]],
Optional[BaseException],
Optional[TracebackType],
],
) -> str:
sio = StringIO()
(typ, val, tb) = ei
# log the stack above the exception capture point if possible, but
# check that we actually have an f_back attribute to work around
# https://twistedmatrix.com/trac/ticket/9305
if tb and hasattr(tb.tb_frame, "f_back"):
sio.write("Capture point (most recent call last):\n")
traceback.print_stack(tb.tb_frame.f_back, None, sio)
traceback.print_exception(typ, val, tb, None, sio)
s = sio.getvalue()
sio.close()
if s[-1:] == "\n":
s = s[:-1]
return s
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