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import threading
from typing import Any
class PropagatingThread(threading.Thread):
"""A Threading Class that raises errors it caught, and returns the return value of the target on join."""
def __init__(self, *args, **kwargs):
self._target = None
self._args = ()
self._kwargs = {}
super().__init__(*args, **kwargs)
self.exception = None
self.return_value = None
assert self._target
def run(self):
"""Don't override this if you want the behavior of this class, use target instead."""
if self._target:
self.return_value = self._target(*self._args, **self._kwargs)
except Exception as e:
self.exception = e
# see super().run() for why this is necessary
del self._target, self._args, self._kwargs
def join(self, timeout=None) -> Any:
if self.exception:
raise self.exception
return self.return_value
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