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cover anyio’s NoEventLoopError without altering existing behavior #145

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cover anyio’s NoEventLoopError without altering existing behavior #145

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12 changes: 11 additions & 1 deletion pyagentspec/src/pyagentspec/adapters/langgraph/mcp_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -83,6 +83,15 @@ class AsyncContext(Enum):
SYNC_WORKER = "sync_worker"


# anyio.NoEventLoopError was added in anyio 4.11. anyio 4.10 is still supported
# (via the langgraph/evaluation extras), where the attribute does not exist.
# Once the minimum anyio version is ≥ 4.11, replace this with a plain
# tuple and catch anyio.NoEventLoopError directly (commented out below)
_NO_LOOP_ERRORS: tuple[type[BaseException], ...] = (AsyncLibraryNotFoundError,)
if hasattr(anyio, "NoEventLoopError"):
_NO_LOOP_ERRORS = (*_NO_LOOP_ERRORS, anyio.NoEventLoopError)


def get_execution_context() -> AsyncContext:
"""
Return one of:
Expand All @@ -93,7 +102,8 @@ def get_execution_context() -> AsyncContext:
try:
anyio.get_current_task()
return AsyncContext.ASYNC
except AsyncLibraryNotFoundError:
# except (AsyncLibraryNotFoundError, anyio.NoEventLoopError): # anyio>4.10
except _NO_LOOP_ERRORS:
current_thread = from_thread.current_thread() # type: ignore
worker_name = current_thread.name.lower()
if "worker" in worker_name and "anyio" in worker_name:
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