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fix(session): add file locking to prevent race conditions in multi-session sync #52

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fix(session): add file locking to prevent race conditions in multi-session sync #52

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12 changes: 11 additions & 1 deletion anygen/agent-harness/cli_anything/anygen/core/session.py
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Original file line number Diff line number Diff line change
Expand Up @@ -97,13 +97,23 @@ def _auto_save(self):
self.save(self._session_file)

def save(self, path: str):
import fcntl

data = {
"history": [e.to_dict() for e in self._history],
"redo_stack": [e.to_dict() for e in self._redo_stack],
}
Path(path).parent.mkdir(parents=True, exist_ok=True)

# Use file locking to prevent race conditions in multi-session scenarios
with open(path, "w") as f:
json.dump(data, f, indent=2, default=str)
try:
fcntl.flock(f.fileno(), fcntl.LOCK_EX)
json.dump(data, f, indent=2, default=str)
fcntl.flock(f.fileno(), fcntl.LOCK_UN)
except (IOError, OSError):
# Fallback if locking fails (e.g., on some network filesystems)
json.dump(data, f, indent=2, default=str)

def _load(self, path: str):
p = Path(path)
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