Let s start a thread on how to use Ktor `HttpClient` in a `W kotlinlang #ktor

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Title

Marc Knaup

06/12/2019, 12:26 AM

Let's start a thread on how to use Ktor

HttpClient

in a

Worker

(background thread) on native 🙂

👀 1

Workaround for https://github.com/JetBrains/kotlin-native/issues/3061 Use

TransferMode.UNSAFE

to move(!) the

HttpClient

instance to your

Worker

. Unless you create it directly within the worker in which case this is not necessary. In both cases it is stored in an

@ThreadLocal

variable.

worker.execute(TransferMode.UNSAFE, { HttpClient(Ios) }) { httpClient -> threadLocalHttpClient = httpClient }

Launch the coroutine for executing

HttpClient

calls inside your

Worker

GlobalScope.launch(Dispatchers.Unconfined) {
	// use HttpClient
}

Workaround for https://github.com/Kotlin/kotlinx-io/issues/53

body = TextContent(
	text = someJson,
	contentType = ContentType.Application.Json
)

body = ByteArrayContent(
	bytes = someJson.toUtf8(),
	contentType = ContentType.Application.Json
)

You cannot create a

HttpClient

instance on a non-main thread until this is fixed: https://github.com/ktorio/ktor/issues/1183 There may be more of such issue though.

NSURLSession

responds on the main thread and the coroutine continues on that thread due to

Unconfined

😞 Is there a better way of getting the coroutine execution back into the

Worker

rather than using

worker.execute(TransferMode.UNSAFE, …)

e5l

06/13/2019, 12:41 PM

It looks like that problem can be solved by moving constants(and it fixed in the ios support branch). The next big problem is unfrozen values in

atomicfu

primitives and it can't be solved on ktor side for now.

🤔 1

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