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| 1 # Copyright 2013 The Chromium Authors. All rights reserved. | |
| 2 # Use of this source code is governed by a BSD-style license that can be | |
| 3 # found in the LICENSE file. | |
| 4 | |
| 5 """Print prettier and more detailed exceptions.""" | |
| 6 | |
| 7 import math | |
| 8 import os | |
| 9 import sys | |
| 10 import traceback | |
| 11 | |
| 12 from telemetry.core import util | |
| 13 | |
| 14 | |
| 15 def InstallUnhandledExceptionFormatter(): | |
| 16 sys.excepthook = PrintFormattedException | |
| 17 | |
| 18 | |
| 19 def PrintFormattedException(exception_class, exception, tb): | |
| 20 """Prints an Exception in a more useful format than the default. | |
| 21 | |
| 22 TODO(tonyg): Consider further enhancements. For instance: | |
| 23 - Report stacks to maintainers like depot_tools does. | |
| 24 - Add a debug flag to automatically start pdb upon exception. | |
| 25 """ | |
| 26 def _GetFinalFrame(frame): | |
| 27 final_frame = None | |
| 28 while frame is not None: | |
| 29 final_frame = frame | |
| 30 frame = frame.tb_next | |
| 31 return final_frame | |
| 32 | |
| 33 def _AbbreviateMiddle(target, middle, length): | |
| 34 assert length >= 0, 'Must provide positive length' | |
| 35 assert len(middle) <= length, 'middle must not be greater than length' | |
| 36 if len(target) <= length: | |
| 37 return target | |
| 38 half_length = (length - len(middle)) / 2. | |
| 39 return '%s%s%s' % (target[:int(math.floor(half_length))], | |
| 40 middle, | |
| 41 target[-int(math.ceil(half_length)):]) | |
| 42 | |
| 43 base_dir = os.path.abspath(util.GetChromiumSrcDir()) | |
| 44 formatted_exception = traceback.format_exception( | |
| 45 exception_class, exception, tb) | |
| 46 extracted_tb = traceback.extract_tb(tb) | |
| 47 traceback_header = formatted_exception[0].strip() | |
| 48 exception = ''.join([l[2:] if l[:2] == ' ' else l for l in | |
| 49 traceback.format_exception_only(exception_class, | |
| 50 exception)]) | |
| 51 local_variables = [(variable, value) for variable, value in | |
| 52 _GetFinalFrame(tb).tb_frame.f_locals.iteritems() | |
| 53 if variable != 'self'] | |
| 54 | |
| 55 # Format the traceback. | |
| 56 print >> sys.stderr | |
| 57 print >> sys.stderr, traceback_header | |
| 58 for filename, line, function, text in extracted_tb: | |
| 59 filename = os.path.abspath(filename) | |
| 60 if filename.startswith(base_dir): | |
| 61 filename = filename[len(base_dir)+1:] | |
| 62 print >> sys.stderr, ' %s at %s:%d' % (function, filename, line) | |
| 63 print >> sys.stderr, ' %s' % text | |
| 64 | |
| 65 # Format the locals. | |
| 66 if local_variables: | |
| 67 print >> sys.stderr | |
| 68 print >> sys.stderr, 'Locals:' | |
| 69 longest_variable = max([len(v) for v, _ in local_variables]) | |
| 70 for variable, value in sorted(local_variables): | |
| 71 value = repr(value) | |
| 72 possibly_truncated_value = _AbbreviateMiddle(value, ' ... ', 1024) | |
| 73 truncation_indication = '' | |
| 74 if len(possibly_truncated_value) != len(value): | |
| 75 truncation_indication = ' (truncated)' | |
| 76 print >> sys.stderr, ' %s: %s%s' % (variable.ljust(longest_variable + 1), | |
| 77 possibly_truncated_value, | |
| 78 truncation_indication) | |
| 79 | |
| 80 # Format the exception. | |
| 81 print >> sys.stderr | |
| 82 print >> sys.stderr, exception | |
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Chromium Code Reviews
Issue 205243003:
[telemetry] Consolidate global hooks. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src