624a752e79
- deadline: _result()/_abandon() replace 7 BoundedResult constructions and 2 cancel+callback sites; timers handled as a list; dead raise_if_timed_out removed. - file_safety: retired classify_cross_profile_target (0 refs; get_cross_profile_warning stub kept for external callers), _home_and_resolved/_mirror_warning shared by the sandbox/container mirror guards; _find_sandbox_mirror_segments inlined. - estop: _hermes_home/_canonical_root now the file_safety helpers; _reset_log_state_for_tests inlined into its only test. - subagent_lifecycle: _validate_request driven by _UNSUPPORTED_REQUEST_FIELDS table. - turn_liveness: dead start()/_abort_message removed, _emit_warning shared. - process_bootstrap: _enable_happy_eyeballs reused by the client variant. - Comment/docstring compaction across the remaining leaf modules.
139 lines
4.9 KiB
Python
139 lines
4.9 KiB
Python
"""Thread-scoped stdout/stderr silencing for background worker threads.
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``contextlib.redirect_stdout`` reassigns the *process-global* stream, so a
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daemon worker silencing itself also silences every other thread (gateway
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event loop included) for the duration. This module installs a per-thread
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routing proxy as ``sys.stdout``/``sys.stderr``: silenced threads write to a
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sink, everyone else passes through to the original stream. Installed once,
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idempotently, and never uninstalled (that would race other threads mid-write).
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"""
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from __future__ import annotations
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import contextlib
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import os
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import sys
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import threading
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from typing import Iterator, TextIO
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__all__ = ["thread_scoped_silence"]
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_install_lock = threading.Lock()
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# Proxy installed per attribute ("stdout"/"stderr"): never double-wrap.
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_installed: dict[str, "_ThreadRoutingStream"] = {}
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# One process-lifetime sink per stream: global redirects that displace and
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# restore a proxy must not leak a new /dev/null descriptor each time.
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_sinks: dict[str, TextIO] = {}
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_routing_states: dict[str, "_RoutingState"] = {}
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class _RoutingState:
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"""Silencing registry shared by every proxy generation for one stream."""
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def __init__(self, sink: TextIO) -> None:
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self.sink = sink
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self.silenced: dict[int, int] = {}
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self.lock = threading.Lock()
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class _ThreadRoutingStream:
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"""``sys.stdout``/``sys.stderr`` stand-in routing writes per calling thread;
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unknown attributes delegate to the current thread's target."""
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def __init__(self, passthrough: TextIO, state: _RoutingState) -> None:
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self._passthrough = passthrough
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self._state = state
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def _target(self) -> TextIO:
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if self._state.silenced.get(threading.get_ident(), 0) > 0:
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return self._state.sink
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return self._passthrough
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def silence(self, ident: int) -> None:
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with self._state.lock:
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self._state.silenced[ident] = self._state.silenced.get(ident, 0) + 1
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def unsilence(self, ident: int) -> None:
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with self._state.lock:
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depth = self._state.silenced.get(ident, 0) - 1
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if depth > 0:
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self._state.silenced[ident] = depth
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else:
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self._state.silenced.pop(ident, None)
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def write(self, data): # type: ignore[no-untyped-def]
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try:
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return self._target().write(data)
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except Exception:
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return len(data) if isinstance(data, str) else 0
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def flush(self): # type: ignore[no-untyped-def]
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try:
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return self._target().flush()
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except Exception:
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return None
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def writelines(self, lines): # type: ignore[no-untyped-def]
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target = self._target()
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try:
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return target.writelines(lines)
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except Exception:
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return None
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def isatty(self) -> bool:
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try:
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return bool(self._target().isatty())
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except Exception:
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return False
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def fileno(self): # type: ignore[no-untyped-def]
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return self._target().fileno()
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def __getattr__(self, name): # type: ignore[no-untyped-def]
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return getattr(self._target(), name)
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def _ensure_installed(attr: str, passthrough: TextIO) -> "_ThreadRoutingStream":
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"""Install (idempotently) a routing proxy as ``sys.<attr>`` and return it."""
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with _install_lock:
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proxy = _installed.get(attr)
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current = getattr(sys, attr, None)
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if isinstance(current, _ThreadRoutingStream):
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# A redirect context may restore an older proxy; adopt it rather
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# than wrapping it into an unbounded chain.
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_installed[attr] = current
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_routing_states[attr] = current._state
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return current
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if proxy is not None and current is proxy:
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return proxy
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# Route non-silenced threads to whatever is currently bound (an active
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# global redirect keeps its old behavior).
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passthrough = current if current is not None else passthrough
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sink = _sinks.get(attr)
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if sink is None or sink.closed:
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sink = open(os.devnull, "w", encoding="utf-8")
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_sinks[attr] = sink
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state = _routing_states.get(attr)
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if state is None or state.sink is not sink:
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state = _RoutingState(sink)
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_routing_states[attr] = state
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proxy = _ThreadRoutingStream(passthrough, state)
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setattr(sys, attr, proxy)
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_installed[attr] = proxy
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return proxy
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@contextlib.contextmanager
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def thread_scoped_silence() -> Iterator[None]:
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"""Silence ``stdout``/``stderr`` for the *current thread only*."""
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ident = threading.get_ident()
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out_proxy = _ensure_installed("stdout", sys.__stdout__ or sys.stdout)
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err_proxy = _ensure_installed("stderr", sys.__stderr__ or sys.stderr)
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out_proxy.silence(ident)
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err_proxy.silence(ident)
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try:
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yield
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finally:
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out_proxy.unsilence(ident)
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err_proxy.unsilence(ident)
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