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pickling_support.py

import copyreg
from functools import partial
from types import TracebackType

from . import Frame
from . import Traceback

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, *, get_locals=None):
    return unpickle_traceback, (
        Frame(tb.tb_frame, get_locals=get_locals),
        tb.tb_lineno,
        tb.tb_next and Traceback(tb.tb_next, get_locals=get_locals),
    )

# Note: Older versions of tblib will generate pickle archives that call unpickle_exception() with
# fewer arguments. We assign default values to some of the arguments to support this.
def unpickle_exception(func, args, cause, tb, context=None, suppress_context=False, notes=None):
    inst = func(*args)
    inst.__cause__ = cause
    inst.__traceback__ = tb
    inst.__context__ = context
    inst.__suppress_context__ = suppress_context
    if notes is not None:
        inst.__notes__ = notes
    return inst

def pickle_exception(obj):
    # All exceptions, unlike generic Python objects, define __reduce_ex__
    # __reduce_ex__(4) should be no different from __reduce_ex__(3).
    # __reduce_ex__(5) could bring benefits in the unlikely case the exception
    # directly contains buffers, but PickleBuffer objects will cause a crash when
    # running on protocol=4, and there's no clean way to figure out the current
    # protocol from here. Note that any object returned by __reduce_ex__(3) will
    # still be pickled with protocol 5 if pickle.dump() is running with it.
    rv = obj.__reduce_ex__(3)
    if isinstance(rv, str):
        raise TypeError('str __reduce__ output is not supported')
    assert isinstance(rv, tuple)
    assert len(rv) >= 2

return (
        unpickle_exception,
        rv[:2]
        + (
            obj.__cause__,
            obj.__traceback__,
            obj.__context__,
            obj.__suppress_context__,
            # __notes__ doesn't exist prior to Python 3.11; and even on Python 3.11 it may be absent
            getattr(obj, '__notes__', None),
        ),
    ) + rv[2:]

def _get_subclasses(cls):
    # Depth-first traversal of all direct and indirect subclasses of cls
    to_visit = [cls]
    while to_visit:
        this = to_visit.pop()
        yield this
        to_visit += list(this.__subclasses__())

def install(*exc_classes_or_instances, get_locals=None):
    """
    Args:

get_locals (callable): A function that take a frame argument and returns a dict. See :class:`tblib.Traceback` class for example.
    """
    copyreg.pickle(TracebackType, partial(pickle_traceback, get_locals=get_locals))

if not exc_classes_or_instances:
        for exception_cls in _get_subclasses(BaseException):
            copyreg.pickle(exception_cls, pickle_exception)
        return

for exc in exc_classes_or_instances:
        if isinstance(exc, BaseException):
            _install_for_instance(exc, set())
        elif isinstance(exc, type) and issubclass(exc, BaseException):
            copyreg.pickle(exc, pickle_exception)
            # Allow using @install as a decorator for Exception classes
            if len(exc_classes_or_instances) == 1:
                return exc
        else:
            raise TypeError(f'Expected subclasses or instances of BaseException, got {type(exc)}')

def _install_for_instance(exc, seen):
    assert isinstance(exc, BaseException)

# Prevent infinite recursion if we somehow get a self-referential exception. (Self-referential
    # exceptions should never normally happen, but if it did somehow happen, we want to pickle the
    # exception faithfully so the developer can troubleshoot why it happened.)
    if id(exc) in seen:
        return
    seen.add(id(exc))

copyreg.pickle(type(exc), pickle_exception)

if exc.__cause__ is not None:
        _install_for_instance(exc.__cause__, seen)
    if exc.__context__ is not None:
        _install_for_instance(exc.__context__, seen)

# This case is meant to cover BaseExceptionGroup on Python 3.11 as well as backports like the
    # exceptiongroup module
    if hasattr(exc, 'exceptions') and isinstance(exc.exceptions, (tuple, list)):
        for subexc in exc.exceptions:
            if isinstance(subexc, BaseException):
                _install_for_instance(subexc, seen)

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