is there a kotlin native websocket client library or should

Question

is there a kotlin native websocket client library or should we just proxy that to platform specific code

Milan Hruban · Answer

I have never tried but I thought you can use Ktor

Hixie · Answer

it looked like that was jvm only but maybe i misunderstood it

Milan Hruban · Answer

Hixie · Answer

what does Ktor provides a WebSocket client for the following engines CIO OkHttp Js mean I thought CIO and OkHttp were both JVM only

Milan Hruban · Answer

I guess you are right As I said I have never worked with it shrug

Ugi · Answer

I haven t used the ktor ws client yet but I have been using ktor http client on iOS as a part of multi platform project and it works fine so far

Hixie · Answer

ah cool i ll give it a go

Hixie · Answer

< Ugi> do you have an example of doing this i ve been struggling for the past few hours trying to get ktor to work but it seems like i don t have an event loop and i can t figure out how to create one I m working on an iOS library my app is swift calling into the library that wants to use ktor

Ugi · Answer

Hey < Hixie> I m currently at work but I ll try to help you out in the evening I also had some trouble with getting it to work but eventually sorted it out with coroutines

Ugi · Answer

Hey < Hixie> sorry for the delay I had to look up the code to be sure how I implemented it So I m using `1 3 5 native mt` version of coroutines but I think non native mt version should work as well and then in the code that needs to do the actual http call I use ```GlobalScope launch Dispatchers Main httpClient get lt ResponseModel gt https ``` That should get you going at the moment I m using a callback to return the results I m certain there are better ways of doing this for starters not just using GlobalScope but I haven t had the time to get to it yet

Hixie · Answer

when I tried that yesterday it told me that I didn t have an event loop

Hixie · Answer

but maybe i m using the wrong version of coroutines not sure how i select that

Hixie · Answer

i m very new to kotlin and gradle

Ugi · Answer

Could you paste your build gradle here

Hixie · Answer

let me throw it on github somewhere hold on

Hixie · Answer

Hixie · Answer

not sure that code even compiles right now for the record i just threw up whatever i had last looked at on thursday

Ugi · Answer

try adding implementation `org jetbrains kotlinx kotlinx coroutines core common 1 3 5 native mt` to ```sourceSets commonMain dependencies implementation org jetbrains kotlin kotlin stdlib common implementation io ktor ktor client core $ktor version ``` and implementation `org jetbrains kotlinx kotlinx coroutines core native 1 3 5 native mt` and `implementation io ktor ktor client ios 1 3 5 native mt ` to ```sourceSets iosMain dependencies implementation io ktor ktor client ios $ktor version ``` I haven t tried compiling it but maybe it will work

Hixie · Answer

thanks i will try

Hixie · Answer

Could not find io ktor ktor client ios 1 3 5 native mt

Hixie · Answer

ah maybe that last implementation was just a typo

Hixie · Answer

seems to find the dependencies without it

Hixie · Answer

well i got it to build but now it just crashes in kotlin s library ```Uncaught Kotlin exception kotlinx coroutines CoroutinesInternalError Fatal exception in coroutines machinery for DispatchedContinuation WorkerCoroutineDispatcherImpl 25429a8 Continuation $connect$lambda 2COROUTINE$1 Please read KDoc to handleFatalException method and report this incident to maintainers``` followed by a stack trace all in the kotlin libs followed by ```Caused by kotlin ClassCastException kotlin coroutines native internal CompletedContinuation cannot be cast to kotlinx coroutines DispatchedContinuation``` followed by another stack also all in the kotlin libs

Hixie · Answer

i updated the code on github to reflect what i have thanks for the help so far by the way much appreciated

Hixie · Answer

aha it was because my code was throwing an exception

Hixie · Answer

thanks

Hixie · Answer

Looks like the ktor library just doesn t support WebSocket on Kotlin Native on iOS yet <https github com ktorio ktor issues 1894> Anyone else have any suggestions for a WebSocket library for Kotlin Native on iOS

Ugi · Answer

Oh that sucks disappointed But it seems it should be coming soon judging by this <https github com ktorio ktor issues 1215>

Ugi · Answer

Hey < Hixie> take a look at this as well never used it before but states that it has WS integration for multiplatform

Hixie · Answer

interesting stuff will investigate thanks

Hixie · Answer

based on <https korlibs soywiz com korio > it looks like it s android only disappointed

Hixie · Answer

and js but not native ios