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# Copyright 2004 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS-IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# This code must be source compatible with Python 2.6 through 3.3.
"""Import this module to add a hook to call pdb on uncaught exceptions.
To enable this, do the following in your top-level application:
import google.apputils.debug
and then in your main():
google.apputils.debug.Init()
Then run your program with --pdb.
"""
import sys
import gflags as flags
flags.DEFINE_boolean('pdb', 0, 'Drop into pdb on uncaught exceptions')
old_excepthook = None
def _DebugHandler(exc_class, value, tb):
if not flags.FLAGS.pdb or hasattr(sys, 'ps1') or not sys.stderr.isatty():
# we aren't in interactive mode or we don't have a tty-like
# device, so we call the default hook
old_excepthook(exc_class, value, tb)
else:
# Don't impose import overhead on apps that never raise an exception.
import traceback
import pdb
# we are in interactive mode, print the exception...
traceback.print_exception(exc_class, value, tb)
sys.stdout.write('\n')
# ...then start the debugger in post-mortem mode.
pdb.pm()
def Init():
# Must back up old excepthook.
global old_excepthook # pylint: disable=global-statement
if old_excepthook is None:
old_excepthook = sys.excepthook
sys.excepthook = _DebugHandler