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63 lines
1.8 KiB
63 lines
1.8 KiB
#!/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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