udp errors should result in protocol.error_received, inconsistent with vanilla asyncio #601
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fantix
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Aug 15, 2024
uvloop/handles/udp.pyx
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| if isinstance(exc, OSError): | ||
| self._protocol.error_received(exc) | ||
| else: | ||
| self._fatal_error(exc, True) |
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I think this can be replaced by calling _on_sent() with the converted exception.
uvloop/handles/udp.pyx
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| @@ -244,14 +244,20 @@ cdef class UDPTransport(UVBaseTransport): | |||
| ctx.close() | |||
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| exc = convert_error(err) | |||
| self._fatal_error(exc, True) | |||
| if isinstance(exc, OSError): | |||
| self._protocol.error_received(exc) | |||
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This needs to be wrapped with run_in_context...(), see also the _on_sent() below.
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Changes ======= * Add cleanup_socket param on create_unix_server() (#623) (by @fantix in d6114d2) Fixes ===== * Use cythonized SO_REUSEPORT rather than the unwrapped native one. (#609) (by @ptribble in 4083a94 for #550) * UDP errors should result in protocol.error_received (#601) (by @jensbjorgensen in 3c3bbef) * Updates for Cython3 (#587) (by @alan-brooks in 3fba9fa for #587) * Test with Python 3.13 (#610) (by @edgarrmondragon in fb5a139)
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I observed a condition in production where a temporary network outage caused a UDP sendto to fail. In stock asyncio this would result in a call to error_received on the protocol object, but in uvloop this results in a fatal error that closes the transport. This is a rather nasty thing to happen since with vanilla asyncio when the transient network condition was resolved the transport could again be used, but with uvloop you would have to close the transport and repoen it.. See cpython source here:
https://github.com/python/cpython/blob/main/Lib/asyncio/selector_events.py#L1240
Sorry I don't have a script/fragment to reproduce the error, to do this you'd have to manipulate the networking stack such that the interface was not available after the transport was created. It's possible of course but I don't know of an easy way to do this.