2c4b3340bf
Merges 8 V1 plugins into 1 unified plugin, adds 4 new components (dep, tst, sec, rvr). 12 sub-modes: arc, eng, do, dbg, xdb, sdb, ndb, ctx, dep, tst, sec, rvr. L1 code-level guarantees: atomic writes, file locks, evidence gating, forced debug routing, 3-phase arc gate, evidence-first debug gate, Chinese language lock, scheduler boundary. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
54 lines
1.7 KiB
Python
54 lines
1.7 KiB
Python
"""
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原子 I/O 模块 — 消除 V1 5 份 _json_dump/_json_load 重复。
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每次写入使用 tempfile + os.replace() 保证原子性，写入前自动备份。
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"""
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from __future__ import annotations
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import contextlib
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import json
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import logging
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import os
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import tempfile
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from pathlib import Path
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logger = logging.getLogger(__name__)
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def atomic_json_write(path: Path, data: dict | list, indent: int = 2) -> None:
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"""POSIX 原子写入：tempfile + os.replace()。写入前自动备份旧文件为 .bak（单级轮转）。"""
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path.parent.mkdir(parents=True, exist_ok=True)
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# 备份旧文件
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if path.exists():
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bak = path.with_suffix(path.suffix + ".bak")
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try:
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os.replace(str(path), str(bak))
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except OSError as exc:
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logger.warning("backup %s -> %s failed: %s", path, bak, exc)
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fd, tmp = tempfile.mkstemp(dir=path.parent, suffix=".tmp")
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try:
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os.write(fd, json.dumps(data, indent=indent, ensure_ascii=False).encode("utf-8"))
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os.close(fd)
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os.replace(tmp, path)
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except BaseException:
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with contextlib.suppress(OSError):
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os.unlink(tmp)
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raise
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def safe_json_load(path: Path) -> dict | list | None:
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"""安全加载：处理损坏文件，自动从 .bak 恢复。文件不存在返回 None。"""
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try:
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return json.loads(path.read_text("utf-8"))
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except FileNotFoundError:
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return None
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except (json.JSONDecodeError, UnicodeDecodeError):
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bak = path.with_suffix(path.suffix + ".bak")
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if bak.exists():
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logger.warning("corrupt %s, restoring from %s", path, bak)
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return json.loads(bak.read_text("utf-8"))
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logger.error("corrupt %s with no backup", path)
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return None
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