Hi i thought i understood Either then i tried employing `io kotlinlang #arrow

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Title

Tower Guidev2

07/11/2022, 11:05 AM

Hi i thought i understood Either, then i tried employing

io.arrow-kt:arrow-core-retrofit

in my android application 🤦‍♂️

previously i was checking

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

where response is

retrofit2.Response

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

Either<NetworkException, Response<UserInfoResponse>>

in my retrofit API interface?

stojan

07/11/2022, 11:47 AM

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

other errors (e.g.

IOException

) still throw

Tower Guidev2

07/12/2022, 8:14 AM

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

07/12/2022, 8:21 AM

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

in that case you can use

ResponseE<ErrorBody, SuccessBody>

where

ResponseE

is like

Response

from retrofit but has an

Either

for success/error

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