anti
e7531ee756
E.3.9.0 prerequisite for the per-source lifters (E.3.9-E.3.13). The dispatch index, install/evict/apply_change atomic-swap protocol, and state-modulation helpers (is_active / apply_ceiling) move out of rule_engine.py into _rule_index.py and _state.py. RuleEngine wraps a RuleIndex; back-compat shims preserve _by_kind / _by_rule / _install attribute access for tests poking at the dispatch internals. Lifters in E.3.9-E.3.12 will each hold their own RuleIndex, watching the same RuleStore via subscribe_changes() fan-out. Hot-reload semantics (disable / clip / TTL via set_state API) now reach lifter-bound rules through the same atomic-swap path the engine uses, not a future composite-rebuild compromise.
56 lines
2.0 KiB
Python
56 lines
2.0 KiB
Python
"""Shared state-modulation helpers for rule consumers.
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Both :class:`~decnet.ttp.impl.rule_engine.RuleEngine` and the per-source
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lifters (E.3.9 onward) read :class:`~decnet.ttp.store.base.RuleState`
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the same way: skip on ``disabled``, defense-in-depth re-check
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``expires_at``, clamp confidence on ``clipped``. Single source of truth
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so a future change to the state contract lands in one place.
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"""
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from __future__ import annotations
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from datetime import datetime, timezone
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from typing import TYPE_CHECKING
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if TYPE_CHECKING:
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from decnet.ttp.store.base import RuleState
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def is_active(state: "RuleState") -> bool:
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"""Return ``True`` iff a rule with this state is allowed to fire.
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``disabled`` rules never fire. ``clipped`` rules still fire — the
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clip caps emitted confidence, doesn't suppress the emit. Expired
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states act as ``disabled`` even though the store auto-reverts; the
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re-check here is defense-in-depth against a racing read between
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expiry and the store's revert pass.
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"""
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if state.state == "disabled":
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return False
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if state.expires_at is not None:
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expires = state.expires_at
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if expires.tzinfo is None:
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expires = expires.replace(tzinfo=timezone.utc)
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if expires < datetime.now(tz=timezone.utc):
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return False
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return True
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def apply_ceiling(base: float, state: "RuleState") -> float:
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"""Apply the operator's confidence ceiling, downward only.
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A ``clipped`` state with ``confidence_max < 1.0`` clamps the emitted
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confidence to ``min(base, base * ceiling)``. Any other state is a
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no-op. The clamp is downward by construction — operator clips can
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never raise a rule's confidence above its YAML-declared base, per
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TTP_TAGGING.md §"Confidence model".
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"""
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if state.state != "clipped":
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return base
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ceiling = state.confidence_max
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if ceiling is None or ceiling >= 1.0:
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return base
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return min(base, base * ceiling)
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__all__ = ["is_active", "apply_ceiling"]
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