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maziggy
60d0c33172
The bidirectional forwarders inside create_tls_proxy._handle catch
(ConnectionError, OSError, asyncio.CancelledError) on writes, but
uvloop's UVStream.write raises a plain RuntimeError from
UVHandle._ensure_alive when the underlying handle is already closed.
asyncio's default selector loop reports the same situation as
ConnectionResetError, so the bug only surfaced on uvloop — and only at
the moment ffmpeg (or a snapshot-capture subprocess) dropped its socket
while the proxy was mid-flush.
The RuntimeError slipped past the except tuple, escaped the forwarder
coroutine, and asyncio's client_connected_cb task-exception handler
logged a noisy multi-line traceback ending in:
RuntimeError: unable to perform operation on
<TCPTransport closed=True ...>; the handler is closed
Adds RuntimeError to the except tuple in both _fwd_to_server and
_fwd_to_client (the latter is the actual frame from the bug report —
server→client is where buffered TLS chunks land after the client has
gone). The forwarders are intentionally fire-and-forget on tear-down;
the existing dst.close() in the finally block already handles cleanup.
No functional regression possible — the connection is already dead by
the time the exception fires; this only changes whether asyncio logs an
"Unhandled exception" trace for it.
2 new regression contract tests in test_camera_tls_proxy.py use
inspect.getsource to assert both forwarder closures' except clauses
include RuntimeError. Source-level rather than a runtime test because
the forwarders are nested closures inside _handle and extracting them
just for testability would require a pure-cosmetic refactor.
Latent since 0feed83c (Fix P2S camera TLS compatibility via OpenSSL
proxy, #661, 2026-03-15) — only commit that ever touched these
forwarders.