c26b7e0a0a
matrix-bot: Code cleanup matrix-bot: Code cleanup# matrix-bot: Code cleanup# matrix-bot: Ping on review neede Add .gitignore Working user ping
32 lines
1.0 KiB
Python
32 lines
1.0 KiB
Python
import fcntl
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import json
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from collections.abc import Generator
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from contextlib import contextmanager
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from pathlib import Path
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from typing import Any
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@contextmanager
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def locked_open(filename: str | Path, mode: str = "r") -> Generator:
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"""
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This is a context manager that provides an advisory write lock on the file specified by `filename` when entering the context, and releases the lock when leaving the context. The lock is acquired using the `fcntl` module's `LOCK_EX` flag, which applies an exclusive write lock to the file.
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"""
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with open(filename, mode) as fd:
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fcntl.flock(fd, fcntl.LOCK_EX)
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yield fd
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fcntl.flock(fd, fcntl.LOCK_UN)
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def write_locked_file(path: Path, data: dict[str, Any]) -> None:
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with locked_open(path, "w+") as f:
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f.write(json.dumps(data, indent=4))
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def read_locked_file(path: Path) -> dict[str, Any]:
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if not path.exists():
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return {}
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with locked_open(path, "r") as f:
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content: str = f.read()
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parsed: list[dict] = json.loads(content)
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return parsed
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