42 lines
1.3 KiB
Python
42 lines
1.3 KiB
Python
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import asyncio
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from typing import AsyncIterator, Tuple
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import pytest
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from vllm.utils import merge_async_iterators
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@pytest.mark.asyncio
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async def test_merge_async_iterators():
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async def mock_async_iterator(idx: int) -> AsyncIterator[str]:
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try:
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while True:
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yield f"item from iterator {idx}"
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await asyncio.sleep(0.1)
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except asyncio.CancelledError:
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pass
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iterators = [mock_async_iterator(i) for i in range(3)]
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merged_iterator: AsyncIterator[Tuple[int, str]] = merge_async_iterators(
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*iterators)
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async def stream_output(generator: AsyncIterator[Tuple[int, str]]):
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async for idx, output in generator:
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print(f"idx: {idx}, output: {output}")
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task = asyncio.create_task(stream_output(merged_iterator))
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await asyncio.sleep(0.5)
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task.cancel()
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with pytest.raises(asyncio.CancelledError):
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await task
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for iterator in iterators:
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try:
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await asyncio.wait_for(anext(iterator), 1)
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except StopAsyncIteration:
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# All iterators should be cancelled and print this message.
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print("Iterator was cancelled normally")
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except (Exception, asyncio.CancelledError) as e:
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raise AssertionError() from e
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