60 lines
1.6 KiB
Python
60 lines
1.6 KiB
Python
# tractor: structured concurrent "actors".
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# Copyright 2018-eternity Tyler Goodlet.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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'''
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`BaseExceptionGroup` related utils and helpers pertaining to
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first-class-`trio` from a historical perspective B)
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'''
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from contextlib import (
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# bontextmanager as cm,
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asynccontextmanager as acm,
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)
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def maybe_collapse_eg(
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beg: BaseExceptionGroup,
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) -> BaseException:
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'''
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If the input beg can collapse to a single non-eg sub-exception,
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return it instead.
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'''
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if len(excs := beg.exceptions) == 1:
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return excs[0]
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return beg
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@acm
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async def collapse_eg():
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'''
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If `BaseExceptionGroup` raised in the body scope is
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"collapse-able" (in the same way that
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`trio.open_nursery(strict_exception_groups=False)` works) then
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only raise the lone emedded non-eg in in place.
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'''
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try:
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yield
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except* BaseException as beg:
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if (
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exc := maybe_collapse_eg(beg)
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) is not beg:
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raise exc
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raise beg
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