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402 lines
14 KiB
Python
402 lines
14 KiB
Python
5 years ago
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"""
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Represent an exception with a lot of information.
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Provides 2 useful functions:
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format_exc: format an exception into a complete traceback, with full
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debugging instruction.
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format_outer_frames: format the current position in the stack call.
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Adapted from IPython's VerboseTB.
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"""
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# Authors: Gael Varoquaux < gael dot varoquaux at normalesup dot org >
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# Nathaniel Gray <n8gray@caltech.edu>
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# Fernando Perez <fperez@colorado.edu>
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# Copyright: 2010, Gael Varoquaux
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# 2001-2004, Fernando Perez
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# 2001 Nathaniel Gray
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# License: BSD 3 clause
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import inspect
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import keyword
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import linecache
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import os
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import pydoc
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import sys
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import time
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import tokenize
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import traceback
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try: # Python 2
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generate_tokens = tokenize.generate_tokens
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except AttributeError: # Python 3
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generate_tokens = tokenize.tokenize
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INDENT = ' ' * 8
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###############################################################################
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# some internal-use functions
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def safe_repr(value):
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"""Hopefully pretty robust repr equivalent."""
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# this is pretty horrible but should always return *something*
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try:
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return pydoc.text.repr(value)
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except KeyboardInterrupt:
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raise
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except:
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try:
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return repr(value)
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except KeyboardInterrupt:
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raise
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except:
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try:
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# all still in an except block so we catch
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# getattr raising
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name = getattr(value, '__name__', None)
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if name:
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# ick, recursion
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return safe_repr(name)
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klass = getattr(value, '__class__', None)
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if klass:
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return '%s instance' % safe_repr(klass)
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except KeyboardInterrupt:
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raise
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except:
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return 'UNRECOVERABLE REPR FAILURE'
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def eq_repr(value, repr=safe_repr):
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return '=%s' % repr(value)
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###############################################################################
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def uniq_stable(elems):
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"""uniq_stable(elems) -> list
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Return from an iterable, a list of all the unique elements in the input,
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but maintaining the order in which they first appear.
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A naive solution to this problem which just makes a dictionary with the
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elements as keys fails to respect the stability condition, since
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dictionaries are unsorted by nature.
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Note: All elements in the input must be hashable.
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"""
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unique = []
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unique_set = set()
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for nn in elems:
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if nn not in unique_set:
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unique.append(nn)
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unique_set.add(nn)
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return unique
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###############################################################################
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def fix_frame_records_filenames(records):
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"""Try to fix the filenames in each record from inspect.getinnerframes().
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Particularly, modules loaded from within zip files have useless filenames
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attached to their code object, and inspect.getinnerframes() just uses it.
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"""
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fixed_records = []
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for frame, filename, line_no, func_name, lines, index in records:
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# Look inside the frame's globals dictionary for __file__, which should
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# be better.
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better_fn = frame.f_globals.get('__file__', None)
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if isinstance(better_fn, str):
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# Check the type just in case someone did something weird with
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# __file__. It might also be None if the error occurred during
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# import.
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filename = better_fn
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fixed_records.append((frame, filename, line_no, func_name, lines,
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index))
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return fixed_records
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def _fixed_getframes(etb, context=1, tb_offset=0):
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LNUM_POS, LINES_POS, INDEX_POS = 2, 4, 5
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records = fix_frame_records_filenames(inspect.getinnerframes(etb, context))
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# If the error is at the console, don't build any context, since it would
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# otherwise produce 5 blank lines printed out (there is no file at the
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# console)
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rec_check = records[tb_offset:]
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try:
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rname = rec_check[0][1]
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if rname == '<ipython console>' or rname.endswith('<string>'):
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return rec_check
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except IndexError:
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pass
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aux = traceback.extract_tb(etb)
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assert len(records) == len(aux)
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for i, (file, lnum, _, _) in enumerate(aux):
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maybe_start = lnum - 1 - context // 2
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start = max(maybe_start, 0)
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end = start + context
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lines = linecache.getlines(file)[start:end]
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buf = list(records[i])
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buf[LNUM_POS] = lnum
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buf[INDEX_POS] = lnum - 1 - start
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buf[LINES_POS] = lines
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records[i] = tuple(buf)
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return records[tb_offset:]
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def _format_traceback_lines(lnum, index, lines, lvals=None):
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numbers_width = 7
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res = []
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i = lnum - index
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for line in lines:
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if i == lnum:
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# This is the line with the error
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pad = numbers_width - len(str(i))
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if pad >= 3:
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marker = '-' * (pad - 3) + '-> '
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elif pad == 2:
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marker = '> '
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elif pad == 1:
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marker = '>'
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else:
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marker = ''
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num = marker + str(i)
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else:
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num = '%*s' % (numbers_width, i)
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line = '%s %s' % (num, line)
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res.append(line)
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if lvals and i == lnum:
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res.append(lvals + '\n')
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i = i + 1
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return res
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def format_records(records): # , print_globals=False):
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# Loop over all records printing context and info
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frames = []
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abspath = os.path.abspath
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for frame, file, lnum, func, lines, index in records:
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try:
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file = file and abspath(file) or '?'
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except OSError:
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# if file is '<console>' or something not in the filesystem,
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# the abspath call will throw an OSError. Just ignore it and
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# keep the original file string.
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pass
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if file.endswith('.pyc'):
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file = file[:-4] + '.py'
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link = file
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args, varargs, varkw, locals = inspect.getargvalues(frame)
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if func == '?':
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call = ''
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else:
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# Decide whether to include variable details or not
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try:
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call = 'in %s%s' % (func, inspect.formatargvalues(args,
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varargs, varkw, locals,
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formatvalue=eq_repr))
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except KeyError:
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# Very odd crash from inspect.formatargvalues(). The
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# scenario under which it appeared was a call to
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# view(array,scale) in NumTut.view.view(), where scale had
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# been defined as a scalar (it should be a tuple). Somehow
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# inspect messes up resolving the argument list of view()
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# and barfs out. At some point I should dig into this one
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# and file a bug report about it.
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print("\nJoblib's exception reporting continues...\n")
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call = 'in %s(***failed resolving arguments***)' % func
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# Initialize a list of names on the current line, which the
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# tokenizer below will populate.
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names = []
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def tokeneater(token_type, token, start, end, line):
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"""Stateful tokeneater which builds dotted names.
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The list of names it appends to (from the enclosing scope) can
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contain repeated composite names. This is unavoidable, since
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there is no way to disambiguate partial dotted structures until
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the full list is known. The caller is responsible for pruning
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the final list of duplicates before using it."""
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# build composite names
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if token == '.':
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try:
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names[-1] += '.'
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# store state so the next token is added for x.y.z names
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tokeneater.name_cont = True
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return
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except IndexError:
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pass
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if token_type == tokenize.NAME and token not in keyword.kwlist:
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if tokeneater.name_cont:
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# Dotted names
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names[-1] += token
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tokeneater.name_cont = False
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else:
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# Regular new names. We append everything, the caller
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# will be responsible for pruning the list later. It's
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# very tricky to try to prune as we go, b/c composite
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# names can fool us. The pruning at the end is easy
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# to do (or the caller can print a list with repeated
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# names if so desired.
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names.append(token)
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elif token_type == tokenize.NEWLINE:
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raise IndexError
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# we need to store a bit of state in the tokenizer to build
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# dotted names
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tokeneater.name_cont = False
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def linereader(file=file, lnum=[lnum], getline=linecache.getline):
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line = getline(file, lnum[0])
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lnum[0] += 1
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return line
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# Build the list of names on this line of code where the exception
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# occurred.
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try:
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# This builds the names list in-place by capturing it from the
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# enclosing scope.
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for token in generate_tokens(linereader):
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tokeneater(*token)
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except (IndexError, UnicodeDecodeError, SyntaxError):
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# signals exit of tokenizer
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# SyntaxError can happen when trying to tokenize
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# a compiled (e.g. .so or .pyd) extension
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pass
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except tokenize.TokenError as msg:
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_m = ("An unexpected error occurred while tokenizing input file %s\n"
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"The following traceback may be corrupted or invalid\n"
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"The error message is: %s\n" % (file, msg))
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print(_m)
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# prune names list of duplicates, but keep the right order
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unique_names = uniq_stable(names)
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# Start loop over vars
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lvals = []
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for name_full in unique_names:
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name_base = name_full.split('.', 1)[0]
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if name_base in frame.f_code.co_varnames:
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if name_base in locals.keys():
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try:
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value = safe_repr(eval(name_full, locals))
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except:
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value = "undefined"
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else:
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value = "undefined"
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name = name_full
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lvals.append('%s = %s' % (name, value))
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#elif print_globals:
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# if frame.f_globals.has_key(name_base):
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# try:
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# value = safe_repr(eval(name_full,frame.f_globals))
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# except:
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# value = "undefined"
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# else:
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# value = "undefined"
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# name = 'global %s' % name_full
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# lvals.append('%s = %s' % (name,value))
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if lvals:
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lvals = '%s%s' % (INDENT, ('\n%s' % INDENT).join(lvals))
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else:
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lvals = ''
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level = '%s\n%s %s\n' % (75 * '.', link, call)
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if index is None:
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frames.append(level)
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else:
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frames.append('%s%s' % (level, ''.join(
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_format_traceback_lines(lnum, index, lines, lvals))))
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return frames
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###############################################################################
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def format_exc(etype, evalue, etb, context=5, tb_offset=0):
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""" Return a nice text document describing the traceback.
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Parameters
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-----------
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etype, evalue, etb: as returned by sys.exc_info
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context: number of lines of the source file to plot
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tb_offset: the number of stack frame not to use (0 = use all)
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"""
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# some locals
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try:
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etype = etype.__name__
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except AttributeError:
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pass
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# Header with the exception type, python version, and date
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pyver = 'Python ' + sys.version.split()[0] + ': ' + sys.executable
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date = time.ctime(time.time())
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pid = 'PID: %i' % os.getpid()
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head = '%s%s%s\n%s%s%s' % (
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etype, ' ' * (75 - len(str(etype)) - len(date)),
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date, pid, ' ' * (75 - len(str(pid)) - len(pyver)),
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pyver)
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# Drop topmost frames if requested
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records = _fixed_getframes(etb, context, tb_offset)
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# Get (safely) a string form of the exception info
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try:
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etype_str, evalue_str = map(str, (etype, evalue))
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except BaseException:
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# User exception is improperly defined.
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etype, evalue = str, sys.exc_info()[:2]
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etype_str, evalue_str = map(str, (etype, evalue))
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# ... and format it
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exception = ['%s: %s' % (etype_str, evalue_str)]
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frames = format_records(records)
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return '%s\n%s\n%s' % (head, '\n'.join(frames), ''.join(exception[0]))
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###############################################################################
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def format_outer_frames(context=5, stack_start=None, stack_end=None,
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ignore_ipython=True):
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LNUM_POS, LINES_POS, INDEX_POS = 2, 4, 5
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records = inspect.getouterframes(inspect.currentframe())
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output = list()
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for i, (frame, filename, line_no, func_name, lines, index) \
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in enumerate(records):
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# Look inside the frame's globals dictionary for __file__, which should
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||
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# be better.
|
||
|
|
better_fn = frame.f_globals.get('__file__', None)
|
||
|
|
if isinstance(better_fn, str):
|
||
|
|
# Check the type just in case someone did something weird with
|
||
|
|
# __file__. It might also be None if the error occurred during
|
||
|
|
# import.
|
||
|
|
filename = better_fn
|
||
|
|
if filename.endswith('.pyc'):
|
||
|
|
filename = filename[:-4] + '.py'
|
||
|
|
if ignore_ipython:
|
||
|
|
# Hack to avoid printing the internals of IPython
|
||
|
|
if (os.path.basename(filename) in ('iplib.py', 'py3compat.py')
|
||
|
|
and func_name in ('execfile', 'safe_execfile', 'runcode')):
|
||
|
|
break
|
||
|
|
maybe_start = line_no - 1 - context // 2
|
||
|
|
start = max(maybe_start, 0)
|
||
|
|
end = start + context
|
||
|
|
lines = linecache.getlines(filename)[start:end]
|
||
|
|
buf = list(records[i])
|
||
|
|
buf[LNUM_POS] = line_no
|
||
|
|
buf[INDEX_POS] = line_no - 1 - start
|
||
|
|
buf[LINES_POS] = lines
|
||
|
|
output.append(tuple(buf))
|
||
|
|
return '\n'.join(format_records(output[stack_end:stack_start:-1]))
|