Verification level
Visible native Isaac cancellation path. The cancellation request may race with a
very fast machine; both cancelled and an already-terminal result are reported
honestly. The program never treats closing its own socket as cancellation.
Run it
Terminal A:
bash
cd demo/server/06_operations_and_cancellation
fastsim config validate run.yaml --json
fastsim-server run.yaml
Terminal B:
bash
cd demo/server/06_operations_and_cancellation
python main.py --timeout 30
GET /api/v1/operations/{id} returns current progress and the terminal result.
DELETE requests cancellation only for cancellable control work; lifecycle
operations reject unsafe cancellation. The final list uses kind, offset, and
limit rather than requesting unbounded history.
If the operation is already terminal, DELETE can return 409; the example catches
only that expected race and still reads the real terminal record.