RuntimeWarning: coroutine 'process_before_invoke_callbacks' was never awaited

[acere]

Description

_invoke_n_no_wait in llmeter/runner.py (line 497) unconditionally creates a coroutine via asyncio.run(process_before_invoke_callbacks(self.callbacks, p)), even when self.callbacks is None or empty. When there is already a running event loop (e.g. in async test contexts or Jupyter notebooks), asyncio.run() cannot be called, and the coroutine object is created but never awaited — triggering:

RuntimeWarning: coroutine 'process_before_invoke_callbacks' was never awaited

Reproduction

pytest tests/unit/test_runner.py::test_invoke_n_no_wait -W error::RuntimeWarning

Suggested fix

Short-circuit the asyncio.run() call when there are no callbacks:

if self.callbacks:
    p = asyncio.run(process_before_invoke_callbacks(self.callbacks, p))

A deeper fix would address the asyncio.run() inside an already-running loop (relevant for notebook/async contexts), potentially using asyncio.get_event_loop().run_until_complete() or restructuring _invoke_n_no_wait to be async-aware.

Context

Found during multi-Python CI testing — the warning appears on all Python versions (3.10–3.13).