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3cc852d339
This is a bit of an experimental change at this point; the idea is to see if it
helps us track down where our stack overflows are coming from by logging the
stack when the exception was caught and turned into a Failure. (We'll also need
edf2704420).
If we deploy this, we'll be able to enable it via the log config yaml.
44 lines
1.5 KiB
Python
44 lines
1.5 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2017 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import StringIO
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import logging
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import traceback
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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 __init__(self, *args, **kwargs):
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super(LogFormatter, self).__init__(*args, **kwargs)
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def formatException(self, ei):
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sio = StringIO.StringIO()
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sio.write("Capture point (most recent call last):\n")
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traceback.print_stack(ei[2].tb_frame.f_back, None, sio)
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traceback.print_exception(ei[0], ei[1], ei[2], 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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