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70 lines
2.2 KiB
70 lines
2.2 KiB
4 years ago
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# coding: utf-8
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"""A mixin for adding a debug log file.
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"""
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# Copyright (c) Jupyter Development Team.
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# Distributed under the terms of the Modified BSD License.
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import contextlib
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import logging
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import os
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import sys
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import tempfile
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import traceback
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from traitlets import Unicode, default
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from traitlets.config import Configurable
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class DebugLogFileMixin(Configurable):
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debug_log_path = Unicode('', config=True, help='Path to use for the debug log file')
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@contextlib.contextmanager
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def debug_logging(self):
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log_path = self.debug_log_path
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if os.path.isdir(log_path):
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log_path = os.path.join(log_path, 'jupyterlab-debug.log')
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if not log_path:
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handle, log_path = tempfile.mkstemp(prefix='jupyterlab-debug-', suffix='.log')
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os.close(handle)
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log = self.log
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# Transfer current log level to the handlers:
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for h in log.handlers:
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h.setLevel(self.log_level)
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log.setLevel('DEBUG')
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# Create our debug-level file handler:
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_debug_handler = logging.FileHandler(
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log_path, 'w', 'utf8', delay=True)
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_log_formatter = self._log_formatter_cls(fmt=self.log_format, datefmt=self.log_datefmt)
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_debug_handler.setFormatter(_log_formatter)
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_debug_handler.setLevel('DEBUG')
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log.addHandler(_debug_handler)
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try:
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yield
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except Exception as ex:
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_, _, exc_traceback = sys.exc_info()
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msg = traceback.format_exception(ex.__class__, ex, exc_traceback)
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for line in msg:
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self.log.debug(line)
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if isinstance(ex, SystemExit):
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print('An error occured. See the log file for details: ', log_path)
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raise
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print('An error occured.')
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print(msg[-1].strip())
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print('See the log file for details: ', log_path)
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self.exit(1)
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else:
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log.removeHandler(_debug_handler)
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_debug_handler.flush()
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_debug_handler.close()
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try:
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os.remove(log_path)
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except FileNotFoundError:
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pass
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log.removeHandler(_debug_handler)
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