steam-backlog-enforcer/steam_backlog_enforcer/_reading_bonus.py
Krzysztof kuhy Rudnicki eb47067617 budget: wake on screen-locker's log.json; stat stamps drop stale earner answers
The enforce loop now waits on an inotify watch of log.json's directory
(_file_wake, ctypes, no new dependency) instead of a plain sleep, so a
credited workout moves the gaming budget within the tick. Earner answers
(workout, LeetCode, reading) are memoised with the source file's
(inode, mtime_ns, size) stamp, so a rewritten file re-asks at once instead
of after the 60 s TTL. Any inotify setup or read failure warns and falls
back to the plain sleep; the stamp still catches the change next tick.

Tests: conftest stubs the wake factory and points workout_log_path at a
tmp path, so no test ever watches the real screen-locker tree.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018RHwVPyiiQMPh4M3JQwQku
2026-10-09 18:52:58 +02:00

72 lines
2.6 KiB
Python

"""Whether a paper-book reading session was credited today, worth an hour.
book-guard (``~/src/book-guard``) publishes reading through its signed ledger,
the same shape as leetcode-guard's, and screen-locker reads the same fact for a
shutdown hour. Shaped like :mod:`steam_backlog_enforcer._leetcode_bonus` where
it matters:
**Fail closed.** Bad JSON, a missing entries array or an unreadable key yields
``None`` -- no bonus, logged at warning. Failing open would let the coupling be
defeated by deleting a file.
**Independent.** Read separately and summed by ``resolve_budget``; nothing here
can move the workout or LeetCode terms.
**One transport.** book-guard has no status server, so there is no fallback;
and no incident either -- until the first book is registered the ledger simply
does not exist, and that is not worth waking anyone about.
The contract (book-guard's ``_quiz.record_verdict``): only ``credit`` rows with
``detail["bonus"] == "1"`` count -- a passed quiz on a 20+ page, 20+ minute
session -- dated by ``detail["ended_at"]``, when the reading happened.
"""
from __future__ import annotations
import logging
from pathlib import Path
from typing import TYPE_CHECKING, Final
import earned_time
from steam_backlog_enforcer._leetcode_ledger import HMAC_KEY_FILE
from steam_backlog_enforcer._status_api import AnswerCache, file_stamp
if TYPE_CHECKING:
from steam_backlog_enforcer.config import Config
logger = logging.getLogger(__name__)
_cache = AnswerCache()
_CACHE_KEY: Final = "book-guard-ledger"
def reset_cache() -> None:
"""Drop the cached answer, forcing the next call to re-read."""
_cache.clear()
def read_ledger_read_today(path: Path) -> bool | None:
"""Whether a verified, bonus-eligible reading session ended today.
Returns:
True or False when the ledger could be read, ``None`` when it could
not -- which is never "did not read". A ledger that does not exist
yet (no book registered) is an honest, silent "no".
"""
return earned_time.done_today(earned_time.READING, path, HMAC_KEY_FILE)
def read_today(config: Config) -> bool | None:
"""Today's reading answer, memoised like the other earners."""
path = Path(config.book_ledger_path).expanduser()
# Stat before reading, so a credit landing mid-read is re-read next tick.
stamp = file_stamp(path)
cached = _cache.fresh(_CACHE_KEY, stamp=stamp)
if cached is not None:
return cached
answer = read_ledger_read_today(path)
if answer is None:
return None
return _cache.store(_CACHE_KEY, answer=answer, stamp=stamp)