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# -*- coding: utf-8 -*-
# A vendored version of part of https://github.com/ionelmc/python-tblib
# pylint:disable=redefined-outer-name,reimported,function-redefined,bare-except,no-else-return,broad-except
####
# Copyright (c) 2013-2016, Ionel Cristian Mărieș
# All rights reserved.
# Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
# following conditions are met:
# 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
# disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided with the distribution.
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
####
# cpython.py
"""
Taken verbatim from Jinja2.
https://github.com/mitsuhiko/jinja2/blob/master/jinja2/debug.py#L267
"""
# pylint:disable=consider-using-dict-comprehension
#import platform # XXX: gevent cannot import platform at the top level; interferes with monkey patching
import sys
def _init_ugly_crap():
"""This function implements a few ugly things so that we can patch the
traceback objects. The function returned allows resetting `tb_next` on
any python traceback object. Do not attempt to use this on non cpython
interpreters
"""
import ctypes
from types import TracebackType
# figure out side of _Py_ssize_t
if hasattr(ctypes.pythonapi, 'Py_InitModule4_64'):
_Py_ssize_t = ctypes.c_int64
else:
_Py_ssize_t = ctypes.c_int
# regular python
class _PyObject(ctypes.Structure):
pass
_PyObject._fields_ = [
('ob_refcnt', _Py_ssize_t),
('ob_type', ctypes.POINTER(_PyObject))
]
# python with trace
if hasattr(sys, 'getobjects'):
class _PyObject(ctypes.Structure):
pass
_PyObject._fields_ = [
('_ob_next', ctypes.POINTER(_PyObject)),
('_ob_prev', ctypes.POINTER(_PyObject)),
('ob_refcnt', _Py_ssize_t),
('ob_type', ctypes.POINTER(_PyObject))
]
class _Traceback(_PyObject):
pass
_Traceback._fields_ = [
('tb_next', ctypes.POINTER(_Traceback)),
('tb_frame', ctypes.POINTER(_PyObject)),
('tb_lasti', ctypes.c_int),
('tb_lineno', ctypes.c_int)
]
def tb_set_next(tb, next):
"""Set the tb_next attribute of a traceback object."""
if not (isinstance(tb, TracebackType) and (next is None or isinstance(next, TracebackType))):
raise TypeError('tb_set_next arguments must be traceback objects')
obj = _Traceback.from_address(id(tb))
if tb.tb_next is not None:
old = _Traceback.from_address(id(tb.tb_next))
old.ob_refcnt -= 1
if next is None:
obj.tb_next = ctypes.POINTER(_Traceback)()
else:
next = _Traceback.from_address(id(next))
next.ob_refcnt += 1
obj.tb_next = ctypes.pointer(next)
return tb_set_next
tb_set_next = None
#try:
# if platform.python_implementation() == 'CPython':
# tb_set_next = _init_ugly_crap()
#except Exception as exc:
# sys.stderr.write("Failed to initialize cpython support: {!r}".format(exc))
#del _init_ugly_crap
# __init__.py
import re
from types import CodeType
from types import TracebackType
try:
from __pypy__ import tproxy
except ImportError:
tproxy = None
__version__ = '1.3.0'
__all__ = ('Traceback',)
PY3 = sys.version_info[0] == 3
FRAME_RE = re.compile(r'^\s*File "(?P<co_filename>.+)", line (?P<tb_lineno>\d+)(, in (?P<co_name>.+))?$')
class _AttrDict(dict):
__slots__ = ()
__getattr__ = dict.__getitem__
# noinspection PyPep8Naming
class __traceback_maker(Exception):
pass
class TracebackParseError(Exception):
pass
class Code(object):
def __init__(self, code):
self.co_filename = code.co_filename
self.co_name = code.co_name
# gevent: copy more attributes
self.co_nlocals = code.co_nlocals
self.co_stacksize = code.co_stacksize
self.co_flags = code.co_flags
self.co_firstlineno = code.co_firstlineno
class Frame(object):
def __init__(self, frame):
self.f_globals = dict([
(k, v)
for k, v in frame.f_globals.items()
if k in ("__file__", "__name__")
])
self.f_code = Code(frame.f_code)
def clear(self):
# For compatibility with PyPy 3.5;
# clear was added to frame in Python 3.4
# and is called by traceback.clear_frames(), which
# in turn is called by unittest.TestCase.assertRaises
pass
class Traceback(object):
tb_next = None
def __init__(self, tb):
self.tb_frame = Frame(tb.tb_frame)
# noinspection SpellCheckingInspection
self.tb_lineno = int(tb.tb_lineno)
# Build in place to avoid exceeding the recursion limit
tb = tb.tb_next
prev_traceback = self
cls = type(self)
while tb is not None:
traceback = object.__new__(cls)
traceback.tb_frame = Frame(tb.tb_frame)
traceback.tb_lineno = int(tb.tb_lineno)
prev_traceback.tb_next = traceback
prev_traceback = traceback
tb = tb.tb_next
def as_traceback(self):
if tproxy:
return tproxy(TracebackType, self.__tproxy_handler)
if not tb_set_next:
raise RuntimeError("Cannot re-create traceback !")
current = self
top_tb = None
tb = None
while current:
f_code = current.tb_frame.f_code
code = compile('\n' * (current.tb_lineno - 1) + 'raise __traceback_maker', current.tb_frame.f_code.co_filename, 'exec')
if PY3:
code = CodeType(
0, code.co_kwonlyargcount,
code.co_nlocals, code.co_stacksize, code.co_flags,
code.co_code, code.co_consts, code.co_names, code.co_varnames,
f_code.co_filename, f_code.co_name,
code.co_firstlineno, code.co_lnotab, (), ()
)
else:
code = CodeType(
0,
code.co_nlocals, code.co_stacksize, code.co_flags,
code.co_code, code.co_consts, code.co_names, code.co_varnames,
f_code.co_filename.encode(), f_code.co_name.encode(),
code.co_firstlineno, code.co_lnotab, (), ()
)
# noinspection PyBroadException
try:
exec(code, current.tb_frame.f_globals, {})
except:
next_tb = sys.exc_info()[2].tb_next
if top_tb is None:
top_tb = next_tb
if tb is not None:
tb_set_next(tb, next_tb)
tb = next_tb
del next_tb
current = current.tb_next
try:
return top_tb
finally:
del top_tb
del tb
# noinspection SpellCheckingInspection
def __tproxy_handler(self, operation, *args, **kwargs):
if operation in ('__getattribute__', '__getattr__'):
if args[0] == 'tb_next':
return self.tb_next and self.tb_next.as_traceback()
else:
return getattr(self, args[0])
else:
return getattr(self, operation)(*args, **kwargs)
def to_dict(self):
"""Convert a Traceback into a dictionary representation"""
if self.tb_next is None:
tb_next = None
else:
tb_next = self.tb_next.to_dict()
code = {
'co_filename': self.tb_frame.f_code.co_filename,
'co_name': self.tb_frame.f_code.co_name,
}
frame = {
'f_globals': self.tb_frame.f_globals,
'f_code': code,
}
return {
'tb_frame': frame,
'tb_lineno': self.tb_lineno,
'tb_next': tb_next,
}
@classmethod
def from_dict(cls, dct):
if dct['tb_next']:
tb_next = cls.from_dict(dct['tb_next'])
else:
tb_next = None
code = _AttrDict(
co_filename=dct['tb_frame']['f_code']['co_filename'],
co_name=dct['tb_frame']['f_code']['co_name'],
)
frame = _AttrDict(
f_globals=dct['tb_frame']['f_globals'],
f_code=code,
)
tb = _AttrDict(
tb_frame=frame,
tb_lineno=dct['tb_lineno'],
tb_next=tb_next,
)
return cls(tb)
@classmethod
def from_string(cls, string, strict=True):
frames = []
header = strict
for line in string.splitlines():
line = line.rstrip()
if header:
if line == 'Traceback (most recent call last):':
header = False
continue
frame_match = FRAME_RE.match(line)
if frame_match:
frames.append(frame_match.groupdict())
elif line.startswith(' '):
pass
elif strict:
break # traceback ended
if frames:
previous = None
for frame in reversed(frames):
previous = _AttrDict(
frame,
tb_frame=_AttrDict(
frame,
f_globals=_AttrDict(
__file__=frame['co_filename'],
__name__='?',
),
f_code=_AttrDict(frame),
),
tb_next=previous,
)
return cls(previous)
else:
raise TracebackParseError("Could not find any frames in %r." % string)
# pickling_support.py
def unpickle_traceback(tb_frame, tb_lineno, tb_next):
ret = object.__new__(Traceback)
ret.tb_frame = tb_frame
ret.tb_lineno = tb_lineno
ret.tb_next = tb_next
return ret.as_traceback()
def pickle_traceback(tb):
return unpickle_traceback, (Frame(tb.tb_frame), tb.tb_lineno, tb.tb_next and Traceback(tb.tb_next))
def install():
try:
import copy_reg
except ImportError:
import copyreg as copy_reg
copy_reg.pickle(TracebackType, pickle_traceback)
# Added by gevent
# We have to defer the initialization, and especially the import of platform,
# until runtime. If we're monkey patched, we need to be sure to use
# the original __import__ to avoid switching through the hub due to
# import locks on Python 2. See also builtins.py for details.
def _unlocked_imports(f):
def g(a):
if sys is None: # pragma: no cover
# interpreter shutdown on Py2
return
gb = None
if 'gevent.builtins' in sys.modules:
gb = sys.modules['gevent.builtins']
gb._unlock_imports()
try:
return f(a)
finally:
if gb is not None:
gb._lock_imports()
g.__name__ = f.__name__
g.__module__ = f.__module__
return g
def _import_dump_load():
global dumps
global loads
try:
import cPickle as pickle
except ImportError:
import pickle
dumps = pickle.dumps
loads = pickle.loads
dumps = loads = None
_installed = False
def _init():
global _installed
global tb_set_next
if _installed:
return
_installed = True
import platform
try:
if platform.python_implementation() == 'CPython':
tb_set_next = _init_ugly_crap()
except Exception as exc:
sys.stderr.write("Failed to initialize cpython support: {!r}".format(exc))
try:
from __pypy__ import tproxy
except ImportError:
tproxy = None
if not tb_set_next and not tproxy:
raise ImportError("Cannot use tblib. Runtime not supported.")
_import_dump_load()
install()
@_unlocked_imports
def dump_traceback(tb):
# Both _init and dump/load have to be unlocked, because
# copy_reg and pickle can do imports to resolve class names; those
# class names are in this module and greenlet safe though
_init()
return dumps(tb)
@_unlocked_imports
def load_traceback(s):
_init()
return loads(s)