Has anyone created a library for ktor client possible response types? I'm basically thinking of havi...

# ktor

[Colton Idle]

Has anyone created a library for ktor client possible response types? I'm basically thinking of having Kotlin's Result class, but a bit more fine grained in terms of failure cases (network failure (like airplane mode) vs a server failure for example)

[Sam]

I would love it if Ktor returned failure results instead of throwing exceptions 😍

[Sam]

I did try writing something like this for my last project, but I found it virtually impossible to work with a hierarchy of failure result types when there are no union types available.

[Sam]

If/when union types are finally added to the language, I'm really hoping to see Kotlin and its libraries start to move towards using result types as standard instead of exceptions 🙏

[Stylianos Gakis]

Mapping all ktor internal exceptions to one sealed hierarchy should still work shouldn't it?
Then to merge those with whatever your own domain's errors might look like would be a per-project situation of course.

[Colton Idle]

I tried... but ended up failing trying to have a very simple version of

when (val result = myApi.someEndpoint()) {
  is Success -> doSomethingWith(result.response)
  is Failure -> when (result) {
    is NetworkFailure -> showError(result.error)
    is HttpFailure -> showError(result.code)
    is ApiFailure -> showError(result.error)
    is UnknownFailure -> showError(result.error)
  }
}

^ inspired by slack's eithernet library.

but man... just doing result.when then hitting alt + enter and getting all of the success and failure cases was so nice.