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https://github.com/NousResearch/hermes-agent.git
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45e1228a8a
When the user interrupts a long-running task, prompt_toolkit tries to
flush stdout during emergency shutdown. If stdout is in a broken state
(redirected to /dev/null, pipe closed, terminal gone), the flush raises
`OSError: [Errno 5] Input/output error` which propagates unhandled and
crashes the CLI.
Two defense layers:
1. `_suppress_closed_loop_errors`: add `OSError` with `errno.EIO` to
the asyncio exception handler, matching the existing pattern for
`RuntimeError("Event loop is closed")` and `KeyError("is not
registered")`.
2. Outer `except (KeyError, OSError)` block: add `errno.EIO` check
before the existing string-match guards, silently suppressing the
error instead of printing a misleading stdin-related message.
Fixes #13710.
116 lines
4.5 KiB
Python
116 lines
4.5 KiB
Python
"""Tests for OSError EIO suppression during interrupt shutdown (#13710).
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When the user interrupts a running task, prompt_toolkit tries to flush
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stdout during emergency shutdown. If stdout is already in a broken state
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(redirected to /dev/null, pipe closed, etc.), the flush raises
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``OSError: [Errno 5] Input/output error``.
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The ``_suppress_closed_loop_errors`` asyncio exception handler and the
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outer ``except (KeyError, OSError)`` block must both suppress this error
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to prevent a hard crash.
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"""
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from __future__ import annotations
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import errno
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import os
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from unittest.mock import MagicMock
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import pytest
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# ---------------------------------------------------------------------------
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# _suppress_closed_loop_errors – asyncio exception handler
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# ---------------------------------------------------------------------------
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def _make_suppress_fn():
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"""Build a standalone copy of ``_suppress_closed_loop_errors``.
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The real function is defined as a closure inside
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``CLI._run_interactive``; we reconstruct an equivalent here so the
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unit tests don't need a full CLI instance.
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"""
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def _suppress_closed_loop_errors(loop, context):
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exc = context.get("exception")
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if isinstance(exc, RuntimeError) and "Event loop is closed" in str(exc):
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return
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if isinstance(exc, KeyError) and "is not registered" in str(exc):
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return
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if isinstance(exc, OSError) and getattr(exc, "errno", None) == errno.EIO:
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return
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loop.default_exception_handler(context)
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return _suppress_closed_loop_errors
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class TestSuppressClosedLoopErrors:
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"""Verify the asyncio exception handler suppresses expected errors."""
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def test_suppresses_event_loop_closed(self):
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handler = _make_suppress_fn()
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loop = MagicMock()
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handler(loop, {"exception": RuntimeError("Event loop is closed")})
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loop.default_exception_handler.assert_not_called()
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def test_suppresses_key_not_registered(self):
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handler = _make_suppress_fn()
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loop = MagicMock()
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handler(loop, {"exception": KeyError("0 is not registered")})
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loop.default_exception_handler.assert_not_called()
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def test_suppresses_oserror_eio(self):
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"""OSError with errno.EIO must be suppressed (#13710)."""
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handler = _make_suppress_fn()
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loop = MagicMock()
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exc = OSError(errno.EIO, "Input/output error")
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handler(loop, {"exception": exc})
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loop.default_exception_handler.assert_not_called()
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def test_does_not_suppress_oserror_other_errno(self):
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"""OSError with a different errno must still propagate."""
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handler = _make_suppress_fn()
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loop = MagicMock()
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exc = OSError(errno.EACCES, "Permission denied")
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handler(loop, {"exception": exc})
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loop.default_exception_handler.assert_called_once()
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def test_does_not_suppress_unrelated_exception(self):
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"""Unrelated exceptions must still propagate."""
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handler = _make_suppress_fn()
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loop = MagicMock()
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handler(loop, {"exception": ValueError("something else")})
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loop.default_exception_handler.assert_called_once()
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def test_no_exception_key(self):
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"""Context without 'exception' must propagate to default handler."""
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handler = _make_suppress_fn()
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loop = MagicMock()
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handler(loop, {"message": "some log"})
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loop.default_exception_handler.assert_called_once()
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# ---------------------------------------------------------------------------
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# Outer except block – EIO handling
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# ---------------------------------------------------------------------------
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class TestOuterExceptEIO:
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"""Verify the outer ``except (KeyError, OSError)`` block logic."""
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def test_eio_does_not_reraise(self):
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"""OSError with errno.EIO should be silently suppressed."""
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exc = OSError(errno.EIO, "Input/output error")
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# Simulate the condition check from the outer except block:
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assert isinstance(exc, OSError)
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assert getattr(exc, "errno", None) == errno.EIO
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def test_bad_file_descriptor_matches(self):
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"""'Bad file descriptor' string should be caught."""
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exc = OSError(errno.EBADF, "Bad file descriptor")
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assert "Bad file descriptor" in str(exc)
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def test_other_oserror_reraises(self):
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"""Other OSError variants must not match the EIO guard."""
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exc = OSError(errno.EACCES, "Permission denied")
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assert not (getattr(exc, "errno", None) == errno.EIO)
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assert "is not registered" not in str(exc)
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assert "Bad file descriptor" not in str(exc)
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