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support Awaitable .__anext__ #12

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support Awaitable .__anext__ #12

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16 changes: 15 additions & 1 deletion boostedblob/boost.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
from __future__ import annotations

import asyncio
import sys
from typing import (
Any,
AsyncIterable,
Expand All @@ -18,8 +19,12 @@
Type,
TypeVar,
Union,
TYPE_CHECKING,
)

if TYPE_CHECKING:
from _typeshed import SupportsAnext

A = TypeVar("A")
T = TypeVar("T")
R = TypeVar("R")
Expand Down Expand Up @@ -494,6 +499,15 @@ async def blocking_dequeue(self) -> Tuple[int, T]:
return ret


# version of anext that always returns a Coroutine
if sys.version_info >= (3, 10):
async def anext_cr(v: SupportsAnext[T]) -> T:
return await anext(v)
else:
async def anext_cr(v: SupportsAnext[T]) -> T:
return await v.__anext__()


class EageriseBoostable(Boostable[T]):
def __init__(self, iterable: AsyncIterator[T], executor: BoostExecutor) -> None:
super().__init__(executor)
Expand Down Expand Up @@ -544,7 +558,7 @@ async def eagerly_buffer(self) -> None:
# We can't use async for because we need to preserve exceptions
it = self.iterable.__aiter__()
while True:
task = asyncio.create_task(it.__anext__())
task = asyncio.create_task(anext_cr(it))
try:
await task
except StopAsyncIteration:
Expand Down