Rerunning partially failed opertation

Developers Motoko
1

I’m working on a project where user has to send token_A to a canister and then canister mints token_B to the user.

This is oversimplified piece of the code:

private func deposit(loanUUID : T.UUID) : async Result.Result<T.UUID, T.TransferError> {
    let transferResult = await tokenTransfer({...});
    // update state based on outcome of transfer operation

    let mintResult = await tokenTransfer({...});
    // update state based on outcome of mint operation
};

And this is the state I’m holding in case some operation fails:

public type State = {
   depositTransfer: Bool;
   depositMint : Bool;
   withdrawTransfer : Bool;
   withdrawBurn : Bool;
   inProgress : Bool;
 };

So, my question is simple - what is the best approach for retry mechanism in case some of the inter canister call fail (for example: transfer is successful but mint fails so user is stuck with half done deposit flow)?

Should I use period task that automatically retries the deposit procedure or provide the user with retry method?

2

Either is fine, but you know your use case best. But looking at your State object I think an enum would fit much better