Python: support logging ExceptionGroup sub-exceptions #1682
Description
Description
Using the following code:
#!/usr/bin/env python import asyncio import azure.functions as func app = func.FunctionApp() @app.timer_trigger(schedule='0 */1 * * * *', arg_name='mytimer', run_on_startup=True) async def test_task_group_trigger(mytimer): await test_task_group() async def test_task_group(): async def inner_task(i): await asyncio.sleep(0) i/0 async with asyncio.TaskGroup() as tg: for i in range(4): tg.create_task(inner_task(i)) if __name__ == '__main__': asyncio.run(test_task_group())When run in the terminal, ./function_app.py, I get:
+ Exception Group Traceback (most recent call last): | File "/home/user/code/work/canopy/guidepost/tg-test/./function_app.py", line 22, in <module> | asyncio.run(test_task_group()) | File "/home/user/.local/share/pyenv/versions/3.12.10/lib/python3.12/asyncio/runners.py", line 195, in run | return runner.run(main) | ^^^^^^^^^^^^^^^^ | File "/home/user/.local/share/pyenv/versions/3.12.10/lib/python3.12/asyncio/runners.py", line 118, in run | return self._loop.run_until_complete(task) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | File "/home/user/.local/share/pyenv/versions/3.12.10/lib/python3.12/asyncio/base_events.py", line 691, in run_until_complete | return future.result() | ^^^^^^^^^^^^^^^ | File "/home/user/code/work/canopy/guidepost/tg-test/./function_app.py", line 17, in test_task_group | async with asyncio.TaskGroup() as tg: | ^^^^^^^^^^^^^^^^^^^ | File "/home/user/.local/share/pyenv/versions/3.12.10/lib/python3.12/asyncio/taskgroups.py", line 71, in __aexit__ | return await self._aexit(et, exc) | ^^^^^^^^^^^^^^^^^^^^^^^^^^ | File "/home/user/.local/share/pyenv/versions/3.12.10/lib/python3.12/asyncio/taskgroups.py", line 164, in _aexit | raise BaseExceptionGroup( | ExceptionGroup: unhandled errors in a TaskGroup (4 sub-exceptions) +-+---------------- 1 ---------------- | Traceback (most recent call last): | File "/home/user/code/work/canopy/guidepost/tg-test/./function_app.py", line 15, in inner_task | i/0 | ~^~ | ZeroDivisionError: division by zero +---------------- 2 ---------------- | Traceback (most recent call last): | File "/home/user/code/work/canopy/guidepost/tg-test/./function_app.py", line 15, in inner_task | i/0 | ~^~ | ZeroDivisionError: division by zero +---------------- 3 ---------------- | Traceback (most recent call last): | File "/home/user/code/work/canopy/guidepost/tg-test/./function_app.py", line 15, in inner_task | i/0 | ~^~ | ZeroDivisionError: division by zero +---------------- 4 ---------------- | Traceback (most recent call last): | File "/home/user/code/work/canopy/guidepost/tg-test/./function_app.py", line 15, in inner_task | i/0 | ~^~ | ZeroDivisionError: division by zero +------------------------------------ Which is quite helpful. Unfortunately, in func host start --verbose, I get the following traceback instead:
[2025-05-05T22:41:00.001Z] Executing 'Functions.test_task_group_trigger' (Reason='Timer fired at 2025-05-05T15:41:00.0009036-07:00', Id=f3dbc3f3-9b36-479c-bec8-8f73a4031247) [2025-05-05T22:41:00.012Z] Received FunctionInvocationRequest, request ID: 660324cb-db0f-4c07-a270-f6c6ed38ca78, function ID: 71e25862-8f0b-570b-91de-6ee32efde7c7, function name: test_task_group_trigger, invocation ID: f3dbc3f3-9b36-479c-bec8-8f73a4031247, function type: async, timestamp (UTC): 2025-05-05 22:41:00.004631 [2025-05-05T22:41:00.016Z] Executed 'Functions.test_task_group_trigger' (Failed, Id=f3dbc3f3-9b36-479c-bec8-8f73a4031247, Duration=13ms) [2025-05-05T22:41:00.016Z] System.Private.CoreLib: Exception while executing function: Functions.test_task_group_trigger. System.Private.CoreLib: Result: Failure [2025-05-05T22:41:00.016Z] Exception: ExceptionGroup: unhandled errors in a TaskGroup (4 sub-exceptions) [2025-05-05T22:41:00.016Z] Stack: File "/usr/lib/azure-functions-core-tools/workers/python/3.12/LINUX/X64/azure_functions_worker/dispatcher.py", line 659, in _handle__invocation_request [2025-05-05T22:41:00.016Z] await self._run_async_func(fi_context, fi.func, args) [2025-05-05T22:41:00.017Z] File "/usr/lib/azure-functions-core-tools/workers/python/3.12/LINUX/X64/azure_functions_worker/dispatcher.py", line 996, in _run_async_func [2025-05-05T22:41:00.017Z] return await ExtensionManager.get_async_invocation_wrapper( [2025-05-05T22:41:00.017Z] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [2025-05-05T22:41:00.017Z] File "/usr/lib/azure-functions-core-tools/workers/python/3.12/LINUX/X64/azure_functions_worker/extension.py", line 143, in get_async_invocation_wrapper [2025-05-05T22:41:00.017Z] result = await function(**args) [2025-05-05T22:41:00.017Z] ^^^^^^^^^^^^^^^^^^^^^^ [2025-05-05T22:41:00.017Z] File "/home/user/code/work/canopy/guidepost/tg-test/function_app.py", line 13, in test_task_group_trigger [2025-05-05T22:41:00.017Z] await test_task_group() [2025-05-05T22:41:00.017Z] File "/home/user/code/work/canopy/guidepost/tg-test/function_app.py", line 20, in test_task_group [2025-05-05T22:41:00.017Z] async with asyncio.TaskGroup() as tg: [2025-05-05T22:41:00.017Z] ^^^^^^^^^^^^^^^^^^^ [2025-05-05T22:41:00.017Z] File "/home/user/.local/share/pyenv/versions/3.12.10/lib/python3.12/asyncio/taskgroups.py", line 71, in __aexit__ [2025-05-05T22:41:00.017Z] return await self._aexit(et, exc) [2025-05-05T22:41:00.017Z] ^^^^^^^^^^^^^^^^^^^^^^^^^^ [2025-05-05T22:41:00.017Z] File "/home/user/.local/share/pyenv/versions/3.12.10/lib/python3.12/asyncio/taskgroups.py", line 164, in _aexit [2025-05-05T22:41:00.017Z] raise BaseExceptionGroup( [2025-05-05T22:41:00.017Z] . Which isn't all that helpful. It would be nice if func host could log the inner exceptions in an ExceptionGroup so that using asyncio/anyio is a little friendlier.