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73 lines
3.1 KiB
Python
73 lines
3.1 KiB
Python
"""``context_length_cache.yaml`` writes and their cross-process serialization.
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Every agent (CLI, gateway sessions, cron jobs, subagents) persists probed context windows with a
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load -> mutate -> write cycle; unserialized, one writer rewrites a stale snapshot and drops the
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other's entry (or resurrects an invalidated, too-large length).
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"""
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import contextlib
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import functools
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import logging
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import threading
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from utils import atomic_yaml_write
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logger = logging.getLogger(__name__)
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_CONTEXT_CACHE_LOCK_HOLDER = threading.local()
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_CONTEXT_CACHE_LOCK_TIMEOUT_SECONDS = 5.0
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def _write_context_cache(cache: dict[str, int], bedrock_confirmed: dict | None = None) -> None:
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"""Atomic write (a truncating write killed mid-dump leaves a partial file that
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_load_context_cache() swallows as {}, wiping EVERY cached length). Raises on failure."""
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from agent.model_metadata import _get_context_cache_path # facade seam: tests patch the path there
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document = {"context_lengths": cache}
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if bedrock_confirmed:
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document["bedrock_confirmed_v1"] = bedrock_confirmed
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atomic_yaml_write(_get_context_cache_path(), document)
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def locked_context_cache(fn):
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"""Run ``fn``'s load -> mutate -> write cycle under the cache file's cross-process lock.
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The cache is best-effort: when the lock cannot be taken in time the update is skipped, never raised.
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"""
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@functools.wraps(fn)
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def wrapper(*args, **kwargs):
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from agent.model_metadata import _get_context_cache_path # facade seam: tests patch the path there
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from hermes_cli.auth import _file_lock
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path = _get_context_cache_path()
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lock_path = path.with_name(path.name + ".lock")
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with contextlib.ExitStack() as stack:
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try:
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stack.enter_context(_file_lock(
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lock_path, _CONTEXT_CACHE_LOCK_HOLDER, _CONTEXT_CACHE_LOCK_TIMEOUT_SECONDS,
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f"Timed out waiting for the context length cache lock ({lock_path})"))
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except (OSError, TimeoutError):
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logger.debug("Skipping context length cache update", exc_info=True)
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return None
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return fn(*args, **kwargs)
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return wrapper
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@locked_context_cache
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def drop_context_cache_rows(stale_keys: set[str], label: str) -> None:
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"""Remove every key shape of one cached entry (and its Bedrock provenance) under the cache lock.
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Only the file update is locked: callers evict their in-process probe caches unconditionally."""
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from agent.model_metadata import _load_context_cache_document # facade seam: tests patch it there
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document = _load_context_cache_document()
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cache = document.get("context_lengths") or {}
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confirmed = document.get("bedrock_confirmed_v1") or {}
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confirmed = confirmed if isinstance(confirmed, dict) else {}
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if not any(k in cache or k in confirmed for k in stale_keys):
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return
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for k in stale_keys:
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cache.pop(k, None)
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confirmed.pop(k, None)
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try:
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_write_context_cache(cache, confirmed)
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except Exception:
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logger.debug("Failed to invalidate context length cache entry %s", label, exc_info=True)
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