8000 Do not set future if already done by dbrattli · Pull Request #193 · dbrattli/Expression · GitHub
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Do not set future if already done #193

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Merged
merged 1 commit into from
Jan 18, 2024
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Do not set future if already done #193

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9 changes: 6 additions & 3 deletions expression/core/aiotools.py
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Original file line number Diff line number Diff line change
Expand Up @@ -46,13 +46,16 @@ def from_continuations(callback: Callbacks[_TSource]) -> Awaitable[_TSource]:
future: "Future[_TSource]" = asyncio.Future()

def done(value: _TSource) -> None:
future.set_result(value)
if not future.done():
future.set_result(value)

def error(err: Exception) -> None:
future.set_exception(err)
if not future.done():
future.set_exception(err)

def cancel(_: OperationCanceledError) -> None:
future.cancel()
if not future.done():
future.cancel()

callback(done, error, cancel)
return future
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