matrix-bot: Init working sending and receiving

matrix-bot: Code cleanup

matrix-bot: Code cleanup#

matrix-bot: Code cleanup#

matrix-bot: Ping on review neede

Add .gitignore

Working user ping

pkgs/matrix-bot/matrix_bot/locked_open.py

@@ -0,0 +1,31 @@
+import fcntl
+import json
+from collections.abc import Generator
+from contextlib import contextmanager
+from pathlib import Path
+from typing import Any
+
+
+@contextmanager
+def locked_open(filename: str | Path, mode: str = "r") -> Generator:
+    """
+    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.
+    """
+    with open(filename, mode) as fd:
+        fcntl.flock(fd, fcntl.LOCK_EX)
+        yield fd
+        fcntl.flock(fd, fcntl.LOCK_UN)
+
+
+def write_locked_file(path: Path, data: dict[str, Any]) -> None:
+    with locked_open(path, "w+") as f:
+        f.write(json.dumps(data, indent=4))
+
+
+def read_locked_file(path: Path) -> dict[str, Any]:
+    if not path.exists():
+        return {}
+    with locked_open(path, "r") as f:
+        content: str = f.read()
+        parsed: list[dict] = json.loads(content)
+        return parsed