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37e3d5a | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 | """Lightweight hash-based artifact cache (Plan 1.3 Workstream E).
Cache key = crop file content hash + the extracting script's OWN source-file
hash, both computed automatically at every run — no manually-maintained
version string exists to forget bumping (closes Risk R3: a cache keyed on a
human-maintained version constant will eventually serve stale results after
someone edits the algorithm without remembering to bump it).
This is NOT full module/spec-hash reuse (no dependency graph, no partial-
object hashing) — just "don't redo expensive-ish work on unchanged inputs."
"""
from __future__ import annotations
import hashlib
import json
from pathlib import Path
from typing import Any
def file_sha256(path: Path) -> str:
return hashlib.sha256(path.read_bytes()).hexdigest()
def cache_key(crop_path: Path, script_path: Path) -> str:
return f"{file_sha256(crop_path)}:{file_sha256(script_path)[:12]}"
def manifest_path_for(directory: Path, name: str) -> Path:
return directory / ".cache" / name
def load_manifest(path: Path) -> dict[str, Any]:
if not path.exists():
return {}
try:
return json.loads(path.read_text(encoding="utf-8"))
except (json.JSONDecodeError, OSError):
return {}
def save_manifest(path: Path, manifest: dict[str, Any]) -> None:
path.parent.mkdir(parents=True, exist_ok=True)
path.write_text(json.dumps(manifest, indent=2, ensure_ascii=False) + "\n", encoding="utf-8")
def get_cached(manifest_path: Path, key: str) -> dict[str, Any] | None:
return load_manifest(manifest_path).get(key)
def put_cached(manifest_path: Path, key: str, value: dict[str, Any]) -> None:
manifest = load_manifest(manifest_path)
manifest[key] = value
save_manifest(manifest_path, manifest)
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