kotlinlang #ktor

class is full of suspending functions (e.g. https://github.com/JetBrains/kotlinconf-app/blob/master/backend/src/org/jetbrains/kotlinconf/backend/database.kt#L42) that use a dedicated fixed threadpool context. I was wondering what the benefit of this style is? I would understand if the rest of the app called these functions using

async

or something, but as they are all just called synchronously I’m wondering if writing them as suspending functions does anything particular. (Also, as they are not called asynchronously---how does that fixed thread pool actually get used?)

functionaldude

01/24/2019, 8:03 PM

Hi! I read this tutorial https://ktor.io/advanced/utilities.html. This states that

parseUrlEncodedParameters(...)

is used to parse the form-url encoded data from the request body, but then I looked at the function source, the comment said

Parse URL query parameters. Shouldn't be used for urlencoded forms because of "+" character.

I assume this function is only ment to be used on the actual URL parameter, but not on the body. I also found a function

parseQueryString(...)

which produces the correct result on the body. Is this just an oversight in the docs, or am I missing something?

01/24/2019, 10:06 PM

📣 New ktor 1.1.2 released! * Introduced native curl client engine (#479) * Added iosArm32 target (except curl) * Host and port route builders (#825) * Fixed

host()

and

port()

functions to respect proxy (#834) * Fixed classloading issue affecting hot-reload (#825) * Fixed hanging CIO client (#800, #806) * Added CIO client CBC support (#623, #560, #394) * Upgraded JWKS/JWT (#856) * Fixed server

MessageDigest

concurrent issues * Introduced

NonceManager

, deprecated

OAuth2StateProvider

* Prohibited setting session at server after responding the call (#864) * Fixed loosing errors in

StatusPages

if there was already a response sent * Introduced

application

property on

ApplicationEngine

interface * Introduced experimental ktor server exceptions *

BadRequestException

NotFoundException

MissingRequestParameterException

ParameterConversionException

* supported in locations out of the box (including #767) * experimental parameters delegation support * Added routing tailcard prefix support (#876, #526) * Fixed registering content converters with custom content type pattern (#872) * Improved GSON error diagnostics (#811) * Exclude several content types in Compression feature by default: audio, video, event-stream (#817) * Fixed hanging handleWebSocketConversation * Fixed cookie session max-age value to be bumped to Int.MAX_VALUE (#892) * Fixed CIO headers parsing: allowed headers with no values * Fixed client websocket nonce size (#861) * Fixed client scheme parsing * Supported client relative redirects by making #takeFrom() resolve relative urls. (#849) * Fixed network on main thread in CIO (#764) * Changed the default algorithm to SHA-256 from SHA-1 for signed server cookies * Fixed conflicting

WebSockets

and

StatusPages

(#889) * Update gradle to 4.10 * Kotlin 1.3.20, kotlinx.coroutines 1.1.1, kotlinx.serialization 0.10.0 Please note that you have to migrate to Gradle 4.10+ to use ktor with MPP (multiplatform projects) due to Gradle metadata version change. https://ktor.io/quickstart/migration/1.1.2.html

🐸 1

🎉 26

Talon

01/24/2019, 10:43 PM

I'm trying to run a ktor API on my raspberrypi but I get this error

io.ktor.client.call.ReceivePipelineException: Fail to run receive pipeline

doesn't happen locally, I'm thinking maybe I need to configure the client differently or something timeout related?

coletz

01/25/2019, 9:34 PM

is it normal that intellij can't find the package io? using kotlin 1.3.20, intellij 2018.1.3, ktor 1.1.2, gradle 4.10.1 (it compiles, but intellij is showing errors everywhere... this is NOT wrong dsl highlight color as pointed out here https://youtrack.jetbrains.com/issue/IDEA-204487, I am getting error eg on object returned by ktor get, intellij can't detect type etc)

codyoss

01/26/2019, 2:59 AM

Is there a reason ktor clients don't return one of the companion objects for

HttpStatusCode

? It seems like the code just constructs a new one one that matches the status

Int

. I found this odd when I did a

when

switch on the status from

HttpResponse

and the status did not match

HttpStatusCode.OK

Saiedmomen

01/26/2019, 10:08 AM

How can I simulate a no network situation with

MockEngine

galex

01/27/2019, 5:09 AM

Can I use ktor-client-common for a js node app? The documentation talk about clients only for android and iOS, but I can see there’s a kotlin-client-js in the github repo which is just a dependency to ktor-client-common?

📝 1

wollnyst

01/27/2019, 2:29 PM

How can I set an instance of

kotlinx.serialization.json.JsonObject

as body on a ktor-client? The following calls fails with

kotlinx.serialization.SerializationException: Can't locate argument-less serializer for class kotlinx.serialization.json.JsonObject

Copy code

kotlin
  val client = HttpClient(OkHttp) {
      install(JsonFeature) {
          serializer = KotlinxSerializer(JSON.nonstrict)
      }
  }
  <http://client.post|client.post><Unit>(url) {
      body = json { "hello" to "world" }

  }

jdiaz

01/27/2019, 6:44 PM

I'm trying to build ktor from scratch (I'm interested in native curl, I need to customize the libcurl client) but tests are failing, is this known?

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[ RUN      ] io.ktor.client.test.CurlEnginesTest.postTest
kotlin.AssertionError: Expected <HttpBinResponse(url=<http://httpbin.org/post>, args={}, headers={Content-Type=text/plain; charset=UTF-8, Accept=application/json, Content-Length=11, Connection=close, Host=<http://httpbin.org|httpbin.org>})>, actual <HttpBinResponse(url=<http://httpbin.org/post>, args={}, headers={Accept=application/json, Connection=close, Content-Length=11, Content-Type=text/plain; charset=UTF-8, Host=<http://httpbin.org|httpbin.org>, X-Imforwards=20})>.

Vinicius Carvalho

01/27/2019, 8:59 PM

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suspend fun request(offset: Int, limit: Int, endpoint: String) : ApiResponse<List<Map<String,Any>>> {
        val end = limit + offset
        
        return retroClient.request(endpoint = endpoint, offset = offset, limit = limit).execute().body()!! //using retrofit, works

//        internalClient.request {
//            url(URL("$BASE_URL$endpoint?offset=$offset&limit=$limit&format=json&api_key=$API_KEY"))
//            method = HttpMethod.Get
//            headers {
//                append("User-Agent" , "Ktor Apache Client")
//                append("Content-Type", "application/json")
//            }
//        }
    }

dave08

01/28/2019, 1:16 PM

ctrl-click even leads me to the right declaration (I think..).

dave08

01/28/2019, 1:43 PM

Or do I really have to use the

JsonFeature

for this?

dave08

01/28/2019, 5:15 PM

It would be great to have something like delegate properties for

ApplicationConfig

... it's really a bit verbose right now. Instead of:

val username = config.property("username").getString()

, it could be

val username: String by config

!!!

codyoss

01/28/2019, 9:34 PM

Does ktor natively support something Spring’s

@ConfigurationProperties

. I am looking for an easy way to bind a subset on my configuration file to an object. Anything besides me writing custom getters that have a reference to the

Application.enviorment.config

napperley

01/29/2019, 12:38 AM

Is it possible to use Log4j Kotlin ( https://logging.apache.org/log4j/kotlin/index.html ) with Ktor?

Santosh Astagi

01/29/2019, 1:50 AM

I am trying a post request with no response but get a Can't locate argument less serializer error

Aharon

01/29/2019, 7:20 AM

Is it ok to keep a long living instance of io.ktor.client.HttpClient and just call close() on all the HttpResponse objs ? I'm asking cause the docs only talk about closing the HttpClient itself (https://ktor.io/clients/http-client/calls/requests.html) Also we've got a memory leak somewhere in there now...

👌 1

Graeme

01/29/2019, 8:10 AM

@codyoss we have support for

@ConfigurationProperties

which you can use in

micronaut-ktor

https://github.com/micronaut-projects/micronaut-kotlin

💯 1

ribesg

01/29/2019, 8:59 AM

ktor-client-cio

pure Kotlin or not? Can I use it in the common part of a MPP?

Alan Pierri

01/30/2019, 2:09 PM

I'm using ktor also as a client to connect to a https API with self-signed certificate, and I was wandering if there was any way to validate the requests knowing the other end has self-signed cert (skipping CA)

Santosh Astagi

01/30/2019, 7:32 PM

I get a list back from API call, so I have a kotlinxSerializer where I am registering two lists, as val kotlinxSerializer = KotlinxSerializer() kotlinxSerializer.register(FirstList.serializer().list) kotlinxSerializer.register(SecondList.serializer().list) However, when I make the call, only the last registered serializer is used. How can I register multiple lists to the serializer?

Albert

01/30/2019, 8:14 PM

Is it possible to start ktor server on a random port? I am using this:

Copy code

embeddedServer(Netty, port = 0)

But I don't know where I can get the random port from. And the logs are showing it is listening on

<http://0.0.0.0:0>

Louis Saglio

01/30/2019, 10:11 PM

I am trying to understand Ktor form authentication. To do so, I have created a very simple web app but I am stuck on an error for multiple hours and documentation seems incomplete or outdated.

Copy code

fun Application.bank() {
    install(Authentication) {
        form("form") {
            challenge = FormAuthChallenge.Unauthorized
            passwordParamName = "password"
            userParamName = "username"
            validate { credentials ->
                println("Credentials : ${credentials.name}, ${credentials.password}")
                when {
                    credentials.name == "John" && credentials.password == "pa$$w0rd" -> UserIdPrincipal("John")
                    else -> null
                }
            }
        }
    }
    routing {
        authenticate("form") {
            route("account") {
                post {
                    call.respond(HttpStatusCode.OK, "connected")
                }
            }
        }
    }
}

To access the route /account I send this HTTP request :

POST <http://0.0.0.0:8081/account?username=Louis&password=pass>

But this raises an exception :

io.ktor.features.CannotTransformContentToTypeException: Cannot transform this request's content to class io.ktor.http.Parameters

So I guess I should not give credentials to the server via POST body. I have tried sending credentials in JSON with ContentNegocition installed but I get a similar error. If someone could help me ... I will update the documentation once I know how it works. Posted in #server

rrva

01/31/2019, 5:58 AM

Looking at

NettyApplicationEngine

, why does ktor run application code in a threadpool of its own?

Kenneth

01/31/2019, 3:03 PM

Does ktor use anything not supported by GraalVM?

Brian Mahecha

01/31/2019, 4:12 PM

Morning everyone, looking to take an existing Spring Boot application and create the same one using KTor. How has everyones experience with KTor been coming from a Spring background?

jozefdransfield

01/31/2019, 4:27 PM

Hello, does anyone know if Ktor has support for client certifications with ssl?

01/31/2019, 10:08 PM

Anyone tried putting together a ktor / new relic integration?