Hi i thought i understood Either, then i tried emp...

# arrow

[Tower Guidev2]

Hi
i thought i understood Either, then i tried employing io.arrow-kt:arrow-core-retrofit in my android application 🤦‍♂️

[Tower Guidev2]

previously i was checking

if (response.isSuccessful && response.code() == HttpURLConnection.HTTP_OK) {
} else manageHTTPError(response)

where response is retrofit2.Response

[Tower Guidev2]

How do I get to check the same values when I refactor to this

Either<NetworkException, Response<UserInfoResponse>>

in my retrofit API interface?

[stojan]

the way to use it is: Either<ErrorBody, SuccessBody>

2xx response codes get deserialised into SuccessBody and other HTTP codes (errors) get deserialised into ErrorBody

[stojan]

other errors (e.g. IOException) still throw

[Tower Guidev2]

what about the case when I need to detect a certain HTTP code though?, such as 204 for my internet connectivity test network call to

private const val GOOGLE_CONNECTIVITY_CHECK_URL = "<https://connectivitycheck.gstatic.com/generate_204>"

[stojan]

https://github.com/arrow-kt/arrow/blob/1254f1b556c014af1ca23ea7a472776fb7bb58ed/ar[…]otlin/arrow/retrofit/adapter/either/EitherCallAdapterFactory.kt

[stojan]

in that case you can use ResponseE<ErrorBody, SuccessBody> where ResponseE is like Response from retrofit but has an Either for success/error