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import hashlib
import json
import os
from datetime import datetime, timezone
from pathlib import Path
CACHE_DIR = Path.home() / ".cache" / "tmview"
def _cache_path(key: str) -> Path:
return CACHE_DIR / f"{key}.json"
def cache_key(payload: dict) -> str:
canonical = json.dumps(payload, sort_keys=True, separators=(",", ":"))
return hashlib.sha256(canonical.encode()).hexdigest()
def load(key: str):
path = _cache_path(key)
if not path.exists():
return None
try:
with path.open() as f:
entry = json.load(f)
return entry["result"], entry["fetched_at"]
except (KeyError, json.JSONDecodeError, OSError):
return None
def save(key: str, result: dict, fetched_at: str) -> None:
CACHE_DIR.mkdir(parents=True, exist_ok=True)
path = _cache_path(key)
entry = {"fetched_at": fetched_at, "result": result}
tmp = path.with_suffix(".tmp")
try:
with tmp.open("w") as f:
json.dump(entry, f, separators=(",", ":"))
tmp.replace(path)
except OSError:
tmp.unlink(missing_ok=True)
def now_iso() -> str:
return datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ")
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