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64 lines
1.8 KiB
Python
64 lines
1.8 KiB
Python
#!/usr/bin/env python
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# Copyright 2004 Google Inc. All Rights Reserved.
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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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#
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# This code must be source compatible with Python 2.6 through 3.3.
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"""Import this module to add a hook to call pdb on uncaught exceptions.
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To enable this, do the following in your top-level application:
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import google.apputils.debug
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and then in your main():
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google.apputils.debug.Init()
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Then run your program with --pdb.
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"""
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import sys
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import gflags as flags
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flags.DEFINE_boolean('pdb', 0, 'Drop into pdb on uncaught exceptions')
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old_excepthook = None
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def _DebugHandler(exc_class, value, tb):
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if not flags.FLAGS.pdb or hasattr(sys, 'ps1') or not sys.stderr.isatty():
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# we aren't in interactive mode or we don't have a tty-like
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# device, so we call the default hook
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old_excepthook(exc_class, value, tb)
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else:
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# Don't impose import overhead on apps that never raise an exception.
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import traceback
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import pdb
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# we are in interactive mode, print the exception...
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traceback.print_exception(exc_class, value, tb)
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sys.stdout.write('\n')
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# ...then start the debugger in post-mortem mode.
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pdb.pm()
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def Init():
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# Must back up old excepthook.
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global old_excepthook # pylint: disable=global-statement
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if old_excepthook is None:
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old_excepthook = sys.excepthook
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sys.excepthook = _DebugHandler
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