[Help] How to implement KotlinSuspendFunction1 in Swift?

[matt-ramotar]

Hey! Awesome library. QQ - How to implement KotlinSuspendFunction1 in Swift?

Kotlin function signature:

    fun <T: Cacheable> sync(
        key: String,
        getFromRemote: suspend (key: String) -> Result<T, Exception>,
        onCompletion: (Result<*, Exception>) -> Unit = {}
    )

Swift usage:

    init () {
        treeSquirrel.sync(key: KEY, getFromRemote: <#T##KotlinSuspendFunction1#> , onCompletion: { result in
            self.onCompletion(result: result)
        } )
    }

Swift callback I want to pass in treeSquirrel.sync():

func getFromRemote(){
        Task {
            do {
                let response = await asyncResult(for: api.fetchNative(url: URL))
                
                guard case let .success(result) = response else { return }

                let model = try? JSONDecoder().decode(
                    Model.self,
                    from: result.data(using: .utf8)!
                )
                
                self.result = Model(id: model.id)  
            } 
        }
    }

[rickclephas]

Hi! At the moment Swift to Kotlin cases aren't supported, see #42.
But the logic would be pretty similar. E.g. instead of the suspend lambda you would have to expose a lambda with a completion handler.

Something like the following should work (but doesn't support cancellation):

fun <T: Cacheable> sync(
    key: String,
    getFromRemote: (key: String, completionHandler: (Result<T, Exception>) -> Unit) -> Unit,
    onCompletion: (Result<*, Exception>) -> Unit = {}
)

[matt-ramotar]

Got it - Thanks!!