Use with timeout middleware returns partial tracebacks

[JGoutin]

Hello,

I am using a timeout middleware that add a timeout on each request and return a 504 response when reached (Using await asyncio.wait_for(call_next(request), timeout=30) just like this: #890 (comment)).

This work very well and do the job as intended.

But there is an issue when trying to debug the cause of the timeout, the traceback is not full and don't show the line that cause the delay:

Example as follow:

Traceback (most recent call last):
File "/usr/local/lib/python3.11/site-packages/anyio/streams/memory.py", line 94, in receive
File "/usr/local/lib/python3.11/site-packages/anyio/streams/memory.py", line 89, in receive_nowait
anyio.WouldBlock

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/local/lib/python3.11/asyncio/tasks.py", line 490, in wait_for
File "/usr/local/lib/python3.11/site-packages/starlette/middleware/base.py", line 43, in call_next
File "/usr/local/lib/python3.11/site-packages/anyio/streams/memory.py", line 102, in receive
File "/usr/local/lib/python3.11/asyncio/locks.py", line 213, in wait
asyncio.exceptions.CancelledError

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/usr/local/lib/python3.11/site-packages/webapp/timeout_middleware.py", line 158, in dispatch
File "/usr/local/lib/python3.11/asyncio/tasks.py", line 492, in wait_for
TimeoutError

Is there some way to get the full traceback with the exact error line ?

[Kludex]

What's your starlette version?

[JGoutin]

0.20.4

[Kludex]

Does it reproduces on 0.21.0? I think we fixed that already.

[JGoutin]

Yes, I get the same traceback with 0.21.0.