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Edit File : __init__.py \| Size : 7.48 KB
import re import sys __version__ = '3.1.0' __all__ = 'Code', 'Frame', 'Traceback', 'TracebackParseError' FRAME_RE = re.compile(r'^\sFile "(?P<co_filename>.+)", line (?P<tb_lineno>\d+)(, in (?P<co_name>.+))?$') class _AttrDict(dict): __slots__ = () def __getattr__(self, name): try: return self[name] except KeyError: raise AttributeError(name) from None # noinspection PyPep8Naming class __traceback_maker(Exception): pass class TracebackParseError(Exception): pass class Code: """ Class that replicates just enough of the builtin Code object to enable serialization and traceback rendering. """ co_code = None def __init__(self, code): self.co_filename = code.co_filename self.co_name = code.co_name self.co_argcount = 0 self.co_kwonlyargcount = 0 self.co_varnames = () self.co_nlocals = 0 self.co_stacksize = 0 self.co_flags = 64 self.co_firstlineno = 0 class Frame: """ Class that replicates just enough of the builtin Frame object to enable serialization and traceback rendering. Args: get_locals (callable): A function that take a frame argument and returns a dict. See :class:`Traceback` class for example. """ def __init__(self, frame, , get_locals=None): self.f_locals = {} if get_locals is None else get_locals(frame) self.f_globals = {k: v for k, v in frame.f_globals.items() if k in ('__file__', '__name__')} self.f_code = Code(frame.f_code) self.f_lineno = frame.f_lineno 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 """ class Traceback: """ Class that wraps builtin Traceback objects. Args: get_locals (callable): A function that take a frame argument and returns a dict. Ideally you will only return exactly what you need, and only with simple types that can be json serializable. Example: .. code:: python def get_locals(frame): if frame.f_locals.get("__tracebackhide__"): return {"__tracebackhide__": True} else: return {} """ tb_next = None def __init__(self, tb, *, get_locals=None): self.tb_frame = Frame(tb.tb_frame, get_locals=get_locals) 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, get_locals=get_locals) traceback.tb_lineno = int(tb.tb_lineno) prev_traceback.tb_next = traceback prev_traceback = traceback tb = tb.tb_next def as_traceback(self): """ Convert to a builtin Traceback object that is usable for raising or rendering a stacktrace. """ current = self top_tb = None tb = None stub = compile( 'raise __traceback_maker', '<string>', 'exec', ) while current: f_code = current.tb_frame.f_code code = stub.replace( co_firstlineno=current.tb_lineno, co_argcount=0, co_filename=f_code.co_filename, co_name=f_code.co_name, co_freevars=(), co_cellvars=(), ) # noinspection PyBroadException try: exec(code, dict(current.tb_frame.f_globals), dict(current.tb_frame.f_locals)) # noqa: S102 except Exception: next_tb = sys.exc_info()[2].tb_next if top_tb is None: top_tb = next_tb if tb is not None: tb.tb_next = next_tb tb = next_tb del next_tb current = current.tb_next try: return top_tb finally: del top_tb del tb to_traceback = as_traceback def as_dict(self): """ Converts to a dictionary representation. You can serialize the result to JSON as it only has builtin objects like dicts, lists, ints or strings. """ if self.tb_next is None: tb_next = None else: tb_next = self.tb_next.as_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_locals': self.tb_frame.f_locals, 'f_code': code, 'f_lineno': self.tb_frame.f_lineno, } return { 'tb_frame': frame, 'tb_lineno': self.tb_lineno, 'tb_next': tb_next, } to_dict = as_dict @classmethod def from_dict(cls, dct): """ Creates an instance from a dictionary with the same structure as ``.as_dict()`` returns. """ 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_locals=dct['tb_frame'].get('f_locals', {}), f_code=code, f_lineno=dct['tb_frame']['f_lineno'], ) tb = _AttrDict( tb_frame=frame, tb_lineno=dct['tb_lineno'], tb_next=tb_next, ) return cls(tb, get_locals=get_all_locals) @classmethod def from_string(cls, string, strict=True): """ Creates an instance by parsing a stacktrace. Strict means that parsing stops when lines are not indented by at least two spaces anymore. """ 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_locals={}, f_code=_AttrDict(frame), f_lineno=int(frame['tb_lineno']), ), tb_next=previous, ) return cls(previous) else: raise TracebackParseError(f'Could not find any frames in {string!r}.') def get_all_locals(frame): return dict(frame.f_locals) Back

Edit File : __init__.py | Size : 7.48 KB

import re
import sys

__version__ = '3.1.0'
__all__ = 'Code', 'Frame', 'Traceback', 'TracebackParseError'

FRAME_RE = re.compile(r'^\s*File "(?P<co_filename>.+)", line (?P<tb_lineno>\d+)(, in (?P<co_name>.+))?$')

class _AttrDict(dict):
    __slots__ = ()

def __getattr__(self, name):
        try:
            return self[name]
        except KeyError:
            raise AttributeError(name) from None

# noinspection PyPep8Naming
class __traceback_maker(Exception):
    pass

class TracebackParseError(Exception):
    pass

class Code:
    """
    Class that replicates just enough of the builtin Code object to enable serialization and traceback rendering.
    """

co_code = None

def __init__(self, code):
        self.co_filename = code.co_filename
        self.co_name = code.co_name
        self.co_argcount = 0
        self.co_kwonlyargcount = 0
        self.co_varnames = ()
        self.co_nlocals = 0
        self.co_stacksize = 0
        self.co_flags = 64
        self.co_firstlineno = 0

class Frame:
    """
    Class that replicates just enough of the builtin Frame object to enable serialization and traceback rendering.

Args:

get_locals (callable): A function that take a frame argument and returns a dict.

See :class:`Traceback` class for example.
    """

def __init__(self, frame, *, get_locals=None):
        self.f_locals = {} if get_locals is None else get_locals(frame)
        self.f_globals = {k: v for k, v in frame.f_globals.items() if k in ('__file__', '__name__')}
        self.f_code = Code(frame.f_code)
        self.f_lineno = frame.f_lineno

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
        """

class Traceback:
    """
    Class that wraps builtin Traceback objects.

Args:
        get_locals (callable): A function that take a frame argument and returns a dict.

Ideally you will only return exactly what you need, and only with simple types that can be json serializable.

Example:

.. code:: python

def get_locals(frame):
                    if frame.f_locals.get("__tracebackhide__"):
                        return {"__tracebackhide__": True}
                    else:
                        return {}
    """

tb_next = None

def __init__(self, tb, *, get_locals=None):
        self.tb_frame = Frame(tb.tb_frame, get_locals=get_locals)
        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, get_locals=get_locals)
            traceback.tb_lineno = int(tb.tb_lineno)
            prev_traceback.tb_next = traceback
            prev_traceback = traceback
            tb = tb.tb_next

def as_traceback(self):
        """
        Convert to a builtin Traceback object that is usable for raising or rendering a stacktrace.
        """
        current = self
        top_tb = None
        tb = None
        stub = compile(
            'raise __traceback_maker',
            '<string>',
            'exec',
        )
        while current:
            f_code = current.tb_frame.f_code
            code = stub.replace(
                co_firstlineno=current.tb_lineno,
                co_argcount=0,
                co_filename=f_code.co_filename,
                co_name=f_code.co_name,
                co_freevars=(),
                co_cellvars=(),
            )

# noinspection PyBroadException
            try:
                exec(code, dict(current.tb_frame.f_globals), dict(current.tb_frame.f_locals))  # noqa: S102
            except Exception:
                next_tb = sys.exc_info()[2].tb_next
                if top_tb is None:
                    top_tb = next_tb
                if tb is not None:
                    tb.tb_next = next_tb
                tb = next_tb
                del next_tb

current = current.tb_next
        try:
            return top_tb
        finally:
            del top_tb
            del tb

to_traceback = as_traceback

def as_dict(self):
        """
        Converts to a dictionary representation. You can serialize the result to JSON as it only has
        builtin objects like dicts, lists, ints or strings.
        """
        if self.tb_next is None:
            tb_next = None
        else:
            tb_next = self.tb_next.as_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_locals': self.tb_frame.f_locals,
            'f_code': code,
            'f_lineno': self.tb_frame.f_lineno,
        }
        return {
            'tb_frame': frame,
            'tb_lineno': self.tb_lineno,
            'tb_next': tb_next,
        }

to_dict = as_dict

@classmethod
    def from_dict(cls, dct):
        """
        Creates an instance from a dictionary with the same structure as ``.as_dict()`` returns.
        """
        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_locals=dct['tb_frame'].get('f_locals', {}),
            f_code=code,
            f_lineno=dct['tb_frame']['f_lineno'],
        )
        tb = _AttrDict(
            tb_frame=frame,
            tb_lineno=dct['tb_lineno'],
            tb_next=tb_next,
        )
        return cls(tb, get_locals=get_all_locals)

@classmethod
    def from_string(cls, string, strict=True):
        """
        Creates an instance by parsing a stacktrace. Strict means that parsing stops when lines are not indented by at least two spaces
        anymore.
        """
        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_locals={},
                        f_code=_AttrDict(frame),
                        f_lineno=int(frame['tb_lineno']),
                    ),
                    tb_next=previous,
                )
            return cls(previous)
        else:
            raise TracebackParseError(f'Could not find any frames in {string!r}.')

def get_all_locals(frame):
    return dict(frame.f_locals)

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