Help needed: error handling

[jakub-borusewicz]

Hello!
I'm trying to introduce returns to my new side-project, but it's a bit hard to wrap my head around this library after working for years with OOP.

What I want to do specifically is to implement top-level error handling, where I implement some my_error_handler_func to be composed with IOResult that could contain result of domain logic (let say it's str), or some DomainError, according to given schema (where -> means some method of composition, and => means returning result)

IOResult[str, DomainError] -> my_error_handler_func => str

Important: I would like my_error_handler_func to have access to all of the context necessary to debug the error, if result is IOFailure (so I guess my_error_handler_func should have access to both DomainError itself and IOResult.trace)

What would be recommended way of implementing that?

[jakub-borusewicz]

Additional question - what would be recommended way of turning IOResult[str, DomainError] into IO[str] if result is IOSuccess[str] or to run my_error_handler_func if result is 'IOFailure[DomainError]`?