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crashhandler.py
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crashhandler.py
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# encoding: utf-8
"""sys.excepthook for IPython itself, leaves a detailed report on disk.
Authors:
* Fernando Perez
* Brian E. Granger
"""
#-----------------------------------------------------------------------------
# Copyright (C) 2001-2007 Fernando Perez. <fperez@colorado.edu>
# Copyright (C) 2008-2010 The IPython Development Team
#
# Distributed under the terms of the BSD License. The full license is in
# the file COPYING, distributed as part of this software.
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
import os
import sys
from pprint import pformat
from IPython.core import ultratb
from IPython.external.Itpl import itpl
from IPython.utils.sysinfo import sys_info
#-----------------------------------------------------------------------------
# Code
#-----------------------------------------------------------------------------
# Template for the user message.
_default_message_template = """\
Oops, $self.app_name crashed. We do our best to make it stable, but...
A crash report was automatically generated with the following information:
- A verbatim copy of the crash traceback.
- A copy of your input history during this session.
- Data on your current $self.app_name configuration.
It was left in the file named:
\t'$self.crash_report_fname'
If you can email this file to the developers, the information in it will help
them in understanding and correcting the problem.
You can mail it to: $self.contact_name at $self.contact_email
with the subject '$self.app_name Crash Report'.
If you want to do it now, the following command will work (under Unix):
mail -s '$self.app_name Crash Report' $self.contact_email < $self.crash_report_fname
To ensure accurate tracking of this issue, please file a report about it at:
$self.bug_tracker
"""
class CrashHandler(object):
"""Customizable crash handlers for IPython applications.
Instances of this class provide a :meth:`__call__` method which can be
used as a ``sys.excepthook``. The :meth:`__call__` signature is::
def __call__(self, etype, evalue, etb)
"""
message_template = _default_message_template
def __init__(self, app, contact_name=None, contact_email=None,
bug_tracker=None, show_crash_traceback=True, call_pdb=False):
"""Create a new crash handler
Parameters
----------
app : Application
A running :class:`Application` instance, which will be queried at
crash time for internal information.
contact_name : str
A string with the name of the person to contact.
contact_email : str
A string with the email address of the contact.
bug_tracker : str
A string with the URL for your project's bug tracker.
show_crash_traceback : bool
If false, don't print the crash traceback on stderr, only generate
the on-disk report
Non-argument instance attributes:
These instances contain some non-argument attributes which allow for
further customization of the crash handler's behavior. Please see the
source for further details.
"""
self.app = app
self.app_name = self.app.name
self.contact_name = contact_name
self.contact_email = contact_email
self.bug_tracker = bug_tracker
self.crash_report_fname = "Crash_report_%s.txt" % self.app_name
self.show_crash_traceback = show_crash_traceback
self.section_sep = '\n\n'+'*'*75+'\n\n'
self.call_pdb = call_pdb
#self.call_pdb = True # dbg
def __call__(self, etype, evalue, etb):
"""Handle an exception, call for compatible with sys.excepthook"""
# Report tracebacks shouldn't use color in general (safer for users)
color_scheme = 'NoColor'
# Use this ONLY for developer debugging (keep commented out for release)
#color_scheme = 'Linux' # dbg
try:
rptdir = self.app.ipython_dir
except:
rptdir = os.getcwd()
if rptdir is None or not os.path.isdir(rptdir):
rptdir = os.getcwd()
report_name = os.path.join(rptdir,self.crash_report_fname)
# write the report filename into the instance dict so it can get
# properly expanded out in the user message template
self.crash_report_fname = report_name
TBhandler = ultratb.VerboseTB(
color_scheme=color_scheme,
long_header=1,
call_pdb=self.call_pdb,
)
if self.call_pdb:
TBhandler(etype,evalue,etb)
return
else:
traceback = TBhandler.text(etype,evalue,etb,context=31)
# print traceback to screen
if self.show_crash_traceback:
print >> sys.stderr, traceback
# and generate a complete report on disk
try:
report = open(report_name,'w')
except:
print >> sys.stderr, 'Could not create crash report on disk.'
return
# Inform user on stderr of what happened
msg = itpl('\n'+'*'*70+'\n'+self.message_template)
print >> sys.stderr, msg
# Construct report on disk
report.write(self.make_report(traceback))
report.close()
raw_input("Hit <Enter> to quit this message (your terminal may close):")
def make_report(self,traceback):
"""Return a string containing a crash report."""
sec_sep = self.section_sep
report = ['*'*75+'\n\n'+'IPython post-mortem report\n\n']
rpt_add = report.append
rpt_add(sys_info())
try:
config = pformat(self.app.config)
rpt_add(sec_sep)
rpt_add('Application name: %s\n\n' % self.app_name)
rpt_add('Current user configuration structure:\n\n')
rpt_add(config)
except:
pass
rpt_add(sec_sep+'Crash traceback:\n\n' + traceback)
return ''.join(report)