bug(py): Rare error when closing an unread stream Response with active

[Mantisus]

This is an error that regularly occurs in the context of reading sitemap.xml in crawlee-python.

However, I was unable to create a test case to reproduce it in clean conditions using only impit.

The context of the error occurrence is the interruption of the iterator Response.aiter_bytes, the call await Response.asclose, and the end of the execution of asyncio.run. Adding a small pause asyncio.sleep(0.01) before closing the context completely eliminates the error.

Switching to sync Response.close also avoids the error.

Traceback

an error occurred during closing of asynchronous generator <async_generator object ImpitHttpClient.stream at 0x75041ded28a0>
asyncgen: <async_generator object ImpitHttpClient.stream at 0x75041ded28a0>
handle_traceback: Handle created at (most recent call last):
  File "/home/mantisus/.local/share/uv/python/cpython-3.13.3-linux-x86_64-gnu/lib/python3.13/asyncio/runners.py", line 194, in run
    with Runner(debug=debug, loop_factory=loop_factory) as runner:
  File "/home/mantisus/.local/share/uv/python/cpython-3.13.3-linux-x86_64-gnu/lib/python3.13/asyncio/runners.py", line 62, in __exit__
    self.close()
  File "/home/mantisus/.local/share/uv/python/cpython-3.13.3-linux-x86_64-gnu/lib/python3.13/asyncio/runners.py", line 71, in close
    loop.run_until_complete(loop.shutdown_asyncgens())
  File "/home/mantisus/.local/share/uv/python/cpython-3.13.3-linux-x86_64-gnu/lib/python3.13/asyncio/base_events.py", line 706, in run_until_complete
    self.run_forever()
  File "/home/mantisus/.local/share/uv/python/cpython-3.13.3-linux-x86_64-gnu/lib/python3.13/asyncio/base_events.py", line 677, in run_forever
    self._run_once()
  File "/home/mantisus/.local/share/uv/python/cpython-3.13.3-linux-x86_64-gnu/lib/python3.13/asyncio/base_events.py", line 2026, in _run_once
    handle._run()
  File "/home/mantisus/.local/share/uv/python/cpython-3.13.3-linux-x86_64-gnu/lib/python3.13/asyncio/events.py", line 89, in _run
    self._context.run(self._callback, *self._args)
  File "/home/mantisus/.local/share/uv/python/cpython-3.13.3-linux-x86_64-gnu/lib/python3.13/asyncio/tasks.py", line 873, in _done_callback
    outer.set_result(results)
RuntimeError: aclose(): asynchronous generator is already running

[Mantisus]

No longer reproducible. Probably fixed with other changes.

[Mantisus]

My mistake. Reproduced.

But with new text errors

an error occurred during closing of asynchronous generator <async_generator object ImpitHttpClient.stream at 0x7fa26a25b600>
asyncgen: <async_generator object ImpitHttpClient.stream at 0x7fa26a25b600>
RuntimeError: aclose(): asynchronous generator is already running

thread 'tokio-runtime-worker' panicked at /root/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/pyo3-0.26.0/src/interpreter_lifecycle.rs:117:13:
assertion `left != right` failed: The Python interpreter is not initialized and the `auto-initialize` feature is not enabled.

Consider calling `Python::initialize()` before attempting to use Python APIs.
  left: 0
 right: 0