34 lines
1.1 KiB
Python
34 lines
1.1 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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from clan_cli.jsonrpc import ClanJSONEncoder
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from .dirs import user_history_file
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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_history_file(data: Any) -> None:
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with locked_open(user_history_file(), "w+") as f:
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f.write(json.dumps(data, cls=ClanJSONEncoder, indent=4))
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def read_history_file() -> list[dict]:
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with locked_open(user_history_file(), "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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