53 lines
1.3 KiB
Python
53 lines
1.3 KiB
Python
import asyncio
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import threading
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from queue import Queue
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from typing import Any, AsyncIterable, Coroutine, Iterable, TypeVar
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T = TypeVar("T")
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def run_async(coroutine: Coroutine[Any, Any, T]) -> T:
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if not asyncio.iscoroutine(coroutine):
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raise ValueError("a coroutine was expected, got {!r}".format(coroutine))
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try:
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loop = asyncio.get_running_loop()
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except RuntimeError:
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loop = None
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if loop is not None:
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return loop.run_until_complete(coroutine)
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else:
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return asyncio.run(coroutine)
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def iter_async(iterable: AsyncIterable[T]) -> Iterable[T]:
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if not isinstance(iterable, AsyncIterable):
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raise ValueError("an async iterable was expected, got {!r}".format(iterable))
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queue = Queue()
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async def async_helper():
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try:
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async for chunk in iterable:
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queue.put(chunk)
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queue.put(None)
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except Exception as e:
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queue.put(e)
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def helper():
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run_async(async_helper())
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thread = threading.Thread(target=helper, daemon=True)
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thread.start()
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while True:
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chunk = queue.get()
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if chunk is None:
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break
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if isinstance(chunk, Exception):
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raise chunk
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yield chunk
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thread.join()
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