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64 lines
2 KiB
Python
64 lines
2 KiB
Python
#
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# This file is licensed under the Affero General Public License (AGPL) version 3.
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#
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# Copyright (C) 2023 New Vector, Ltd
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# See the GNU Affero General Public License for more details:
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# <https://www.gnu.org/licenses/agpl-3.0.html>.
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#
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# Originally licensed under the Apache License, Version 2.0:
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# <http://www.apache.org/licenses/LICENSE-2.0>.
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#
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# [This file includes modifications made by New Vector Limited]
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#
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#
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import logging
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import traceback
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from io import StringIO
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from types import TracebackType
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from typing import Optional, Tuple, Type
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class LogFormatter(logging.Formatter):
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"""Log formatter which gives more detail for exceptions
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This is the same as the standard log formatter, except that when logging
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exceptions [typically via log.foo("msg", exc_info=1)], it prints the
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sequence that led up to the point at which the exception was caught.
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(Normally only stack frames between the point the exception was raised and
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where it was caught are logged).
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"""
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def formatException(
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self,
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ei: Tuple[
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Optional[Type[BaseException]],
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Optional[BaseException],
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Optional[TracebackType],
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],
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) -> str:
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sio = StringIO()
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(typ, val, tb) = ei
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# log the stack above the exception capture point if possible, but
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# check that we actually have an f_back attribute to work around
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# https://twistedmatrix.com/trac/ticket/9305
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if tb and hasattr(tb.tb_frame, "f_back"):
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sio.write("Capture point (most recent call last):\n")
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traceback.print_stack(tb.tb_frame.f_back, None, sio)
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traceback.print_exception(typ, val, tb, None, sio)
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s = sio.getvalue()
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sio.close()
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if s[-1:] == "\n":
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s = s[:-1]
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return s
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