mirror of
https://github.com/NousResearch/hermes-agent.git
synced 2026-11-06 13:26:40 +00:00
Maciej Lisiewski
946f73d099
The bundle cache keyed on the newest mtime, stamped after parsing, so a bundle added or edited by `hermes bundles` in the same tick (or mid-scan) never reached a running gateway. Key on sorted per-file content digests stamped before parsing (a few small YAML files; a same-size in-place rewrite within one coarse mtime/ctime tick still moves it), and write bundles atomically so no scan parses a truncated file.
46 lines
1.7 KiB
Python
46 lines
1.7 KiB
Python
"""Run a "concurrent reader" at the exact instant a writer emits bytes (torn-read regression tests).
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A file rewritten in place (``open(path, "w")`` / ``Path.write_text``) is empty from the truncating
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open until the payload lands; another process that reads it then sees ``""``. Racing real threads
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only hits that window probabilistically. This helper makes it deterministic: ``callback`` runs at
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every Python-level ``write()`` on a file object in the current thread, i.e. while the writer is
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mid-publication, so the callback can read the target exactly as a concurrent process would.
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from tests.file_write_observer import observe_file_writes
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seen = []
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with observe_file_writes(lambda: seen.append(target.read_text() if target.exists() else None)):
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writer()
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assert "" not in seen
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An atomic writer (temp file + rename) only writes to its temp file, so the target still holds the
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old bytes (or does not exist yet) at every observation.
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"""
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from __future__ import annotations
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import io
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import sys
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from collections.abc import Callable, Iterator
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from contextlib import contextmanager
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@contextmanager
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def observe_file_writes(callback: Callable[[], None]) -> Iterator[None]:
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"""Call ``callback()`` before every ``write``/``writelines`` on a file object in this thread."""
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def _profile(frame, event, arg):
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if event != "c_call":
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return
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if getattr(arg, "__name__", "") not in ("write", "writelines"):
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return
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if isinstance(getattr(arg, "__self__", None), io.IOBase):
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callback()
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previous = sys.getprofile()
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sys.setprofile(_profile)
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try:
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yield
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finally:
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sys.setprofile(previous)
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