Handling domain error from Saga's published commands

[adventphang]

Hi, I am new to EventFlow, and I find this project really amazing. I have run into an issue that I do not know how to resolve. I did my best looking around - so if there's a documentation on this, or if it has been answered before, appreciate if you can point me to the right direction.

What is the best way to handle DomainError thrown by aggregate as a result of handling a command published from a Saga? My intention is to capture the DomainError and rollback whatever steps the Saga has done before.

To provide additional context to this question:

1. My application publishes SendMoney from account A to account B
2. Account A validates command and emits MoneySentEvent
3. Account A state processes MoneySentEvent and deduct local balance
4. MoneySentEvent starts a new Saga, which publish ReceiveMoneyCommand to account B
5. Account B validates the ReceiveMoneyCommand command, and reject with domain error for whatever reason (account suspended, account does not exist)
6. [My intention] Capture the domain error, and publish additional event to reverse the original amount to account A