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import sys
from contextlib import contextmanager
from typing import Generator
# AnyIO v4 introduces a breaking change that groups all exceptions in a task
# group into an exception group.
# This file allows to be compatible with AnyIO <4 and >=4 by unwrapping groups
# if they only contain a single exception. It also supports python <3.11 (before
# exception groups support) and >=3.11.
# Solution as proposed in https://anyio.readthedocs.io/en/stable/migration.html
has_exceptiongroups = True
if sys.version_info < (3, 11):
try:
from exceptiongroup import BaseExceptionGroup
except ImportError:
has_exceptiongroups = False
@contextmanager
def collapse_excgroups() -> Generator[None, None, None]:
try:
yield
except BaseException as exc:
if has_exceptiongroups:
while isinstance(exc, BaseExceptionGroup) and len(exc.exceptions) == 1:
exc = exc.exceptions[0]
raise exc
__all__ = ["collapse_excgroups"]
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