I want to use an alias for the order by clause in Exposed Kotlin like so:

6371 * ACOS(COS(RADIANS(:latitude)) * COS(RADIANS(`lat`)) * COS(RADIANS(:longitude) - RADIANS(`lng`)) + SIN(RADIANS(:latitude)) * SIN(RADIANS(`lat`))) AS `distance`

Anyone with an idea on how to implement this?

https://kotlinlang.slack.com/archives/C0A974TJ9/p1619618607459400?thread_ts=1619618607.459400&cid=C0A974TJ9 Any ETA on this @hhariri

Hi everyone, I’m facing error while calling Ktor API

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".

SLF4J: Defaulting to no-operation (NOP) logger implementation

This error doesn’t come when i pass HashMap<String, String> to body But whenever i’m passing,

HashMap<String, Any>

then only getting error. Any idea? Do I need to add SLF4J dependency🤔

Hi is there an easy way for the ktor http client to accept self signed certs for dev?

It's really nice of Ktor to use different defaults for serialization on the client-side and on the server-side. Just took me about a day to understand why KotlinX.Serialization wouldn't work. Ktor 1.6.0 server-side,

JsonSupport.kt:54

useArrayPolymorphism = true

Ktor 1.6.0 client-side,

KotlinxSerializer.kt:64

useArrayPolymorphism = false

Where should I report that? GitHub, YouTrack?

This might sound a noob question but just starting on KMM, I want to create an APIClient as shared module for Android and iOS I need the following features in my

Ktor

Implementation. • It should have local SSL data encryption • InternetConnectionCheck Interceptor • ErrorHandlerInterceptor • RetryRequest After RefreshToken Interceptor • Few other custom interceptors Earlier I was writing my APiClient in the

commonMain

but as I can see it does not support addInterceptor property by default, which is available in OkHttp for Android. So the new plan I had is create an expect class APiClient in common main and implement APIClient for Android on AndroidMain with OkHttp engine and APiClient on iOSMain with IOS Engine. Is this approach right ? or am I missing some part ?

Before wasting time, can I use Ktor in a watchOS app/target?

🤞✌️

After updating to latest ver, I have huge problems with proguard ClassCastException and class cannot be cast to reflect.parametrized tipe, I have the feeling that it's more a ktor issue but not sure, debuging this kind of stuff its kind a hell ... specially taking in account that everything went smooth before the update it's something related to pipeline phase ...

I have a problem with interrupted streaming in ktor and

java.net.SocketException: Software caused connection abort

(thread)

I have setup ktor with json serialization and it works well. I can issue a request like this:

val customer: Customer = client.get("<http://127.0.0.1:8080/customer>")

My question is how can I then get the response headers?

👋 is there any way to change the response headers? Server is not sending

WWW-Authenticate

on 401, so the Auth plugin is not working properly. I have tried with:

client.receivePipeline.intercept(HttpReceivePipeline.Before) { response ->
    if (response.status == HttpStatusCode.Unauthorized && !response.headers.contains(HttpHeaders.WWWAuthenticate)) {
        val headers = buildHeaders {
            appendAll(response.headers)
            append(HttpHeaders.WWWAuthenticate, "Bearer")
        }
        proceedWith(object : HttpResponse() {
            override val headers get() = headers
            // delegate all other properties to original response
        })
    } else {
        proceed()
    }
}

And I can see with the debugger that this is invoked before the header check in Ktor's

Auth

class. But still, the response passed to Auth does not include my header. It seems like the response passed to

proceedWith()

does not replace

call.response

, which is what Auth plugin reads. Any idea?

Hi a small suggestion for the self certificate gradle task I think the

generateJks

task in the docs can be improve by setting the output of the task: I did something like this:

tasks.register("generateJks", JavaExec::class) {
    dependsOn("classes")
    group = "certificate"
    classpath = sourceSets["main"].runtimeClasspath
    outputs.dir("${project.buildDir}/certs/")
mainClass.set("com.my.main.Class")
}

and changed the object and the conf file:

val jksFile = File("build/certs/temporary.jks").apply {
            parentFile.mkdirs()
        }

What's the correct way to make a network request inside

bearer.refreshTokens { }

when using the Auth plugin? I'm trying to hit server from there using the same client that initiated the failed request, but I get a deadlock with both requests stuck. If I use a different

HttpClient

only inside

refreshTokens { }

, everything works fine 😕

Hi, just a quick check to understand ktor… for Ktor, when we use for Android, underlying it is using OkHttp. For iOS, what is it using? Alamofire? Thanks 🙏

I am curious, has anybody used ktor as replacement for a mock web server in both Android and iOS automation? I know there is a MockEngine, but that only seems useful if all client requests are being made with a Ktor client and unfortunately my app is not fully converted over yet. So was curious if anybody has tried that or if its even a good use case for ktor?

Hey all, hopefully a simple one... (Edit: Solved) I'm trying to read a file:

File("./srv/emails.txt")

The file is located at

project_root/srv/emails.txt

. But I get a

FileNotFoundException

when I call

readLines

on the file

Is there currently a way to use Ktor and Flows together; so that an HTTP request could be responded to by a

Flow

of (serialized) objects i.e. delivered by HTTP streaming?

Hi! Can u help me? I use ContentConverter for get files over Graphql. Can i convert input ByteReadChannel to PartData using default tooling? Now i use CIOMultipartDataBase for it, but he have @InternalAPI annotation. How i can do right?

Hi, does anyone have some ktor project links of medium-large size, possibly production ready? Looking for learning. Thanks in advance.

Trying to migrate from ktor 1.5.3 to 1.6.0 in my multiplatform project, but got a freeze exception, when initialise HttpClient. I found that there is already known issue with HashMaps (https://github.com/Kotlin/kotlinx.serialization/issues/1450) but looks like it is not my case. There is my stack trace:

Uncaught Kotlin exception: kotlin.native.concurrent.InvalidMutabilityException: mutation attempt of frozen kotlinx.coroutines.JobImpl@2516528
    at 0   DriversAppApi                       0x000000010155103f kfun:kotlin.Throwable#<init>(kotlin.String?){} + 95 (/Users/teamcity3/buildAgent/work/290aee0e088a1666/runtime/src/main/kotlin/kotlin/Throwable.kt:23:37)
    at 1   DriversAppApi                       0x00000001015497ad kfun:kotlin.Exception#<init>(kotlin.String?){} + 93 (/Users/teamcity3/buildAgent/work/290aee0e088a1666/runtime/src/main/kotlin/kotlin/Exceptions.kt:23:44)
    at 2   DriversAppApi                       0x0000000101549a1d kfun:kotlin.RuntimeException#<init>(kotlin.String?){} + 93 (/Users/teamcity3/buildAgent/work/290aee0e088a1666/runtime/src/main/kotlin/kotlin/Exceptions.kt:34:44)
    at 3   DriversAppApi                       0x00000001015819fd kfun:kotlin.native.concurrent.InvalidMutabilityException#<init>(kotlin.String){} + 93 (/Users/teamcity3/buildAgent/work/290aee0e088a1666/runtime/src/main/kotlin/kotlin/native/concurrent/Freezing.kt:22:60)
    at 4   DriversAppApi                       0x0000000101581dcf ThrowInvalidMutabilityException + 431 (/Users/teamcity3/buildAgent/work/290aee0e088a1666/runtime/src/main/kotlin/kotlin/native/concurrent/Internal.kt:93:11)
    at 5   DriversAppApi                       0x00000001016e5b50 MutationCheck + 128
    at 6   DriversAppApi                       0x00000001017ebda6 kfun:kotlinx.coroutines.JobImpl#<init>(kotlinx.coroutines.Job?){} + 150 (/opt/buildAgent/work/44ec6e850d5c63f0/kotlinx-coroutines-core/common/src/JobSupport.kt:1328:46)
    at 7   DriversAppApi                       0x00000001017d692c kfun:kotlinx.coroutines#Job(kotlinx.coroutines.Job?){}kotlinx.coroutines.CompletableJob + 188 (/opt/buildAgent/work/44ec6e850d5c63f0/kotlinx-coroutines-core/common/src/Job.kt:379:55)
    at 8   DriversAppApi                       0x00000001019f9254 kfun:io.ktor.client.HttpClient#<init>(io.ktor.client.engine.HttpClientEngine;io.ktor.client.HttpClientConfig<out|io.ktor.client.engine.HttpClientEngineConfig>){} + 1796 (/Users/administrator/Documents/agent/work/8d547b974a7be21f/ktor-client/ktor-client-core/common/src/io/ktor/client/HttpClient.kt:87:45)
    at 9   DriversAppApi                       0x00000001019fa310 kfun:io.ktor.client.HttpClient#<init>(io.ktor.client.engine.HttpClientEngine;io.ktor.client.HttpClientConfig<out|io.ktor.client.engine.HttpClientEngineConfig>;kotlin.Boolean){} + 144 (/Users/administrator/Documents/agent/work/8d547b974a7be21f/ktor-client/ktor-client-core/common/src/io/ktor/client/HttpClient.kt:81:9)
    at 10  DriversAppApi                       0x00000001019f8ad5 kfun:io.ktor.client#HttpClient(io.ktor.client.engine.HttpClientEngine;kotlin.Function1<io.ktor.client.HttpClientConfig<*>,kotlin.Unit>){}io.ktor.client.HttpClient + 517 (/Users/administrator/Documents/agent/work/8d547b974a7be21f/ktor-client/ktor-client-core/common/src/io/ktor/client/HttpClient.kt:62:17)
    at 11  DriversAppApi                       0x00000001011b389d kfun:com.arrival.adp.drivers.app.api.rest.HttpClientFactory#create(){}io.ktor.client.HttpClient + 285 (/Users/alexander.ivanov/Development/pmob-sdrv-graphql-api-tool/sources/drivers-app-api/src/commonMain/kotlin/com/arrival/adp/drivers/app/api/rest/HttpClientFactory.kt:31:16)

My version changes: kotlin:

1.4.32

->

1.5.10

Ktor:

1.5.3

->

1.6.0

kotlinx.coroutines:

1.4.3-native-mt

->

1.5.0-native-mt

kotlinx.serialization:

1.1.0

->

1.2.1

Does somebody faced this issue?

Hi, while calling ktor API, if my query is of different type, I’m getting below exception java.lang.IllegalStateException: Serializing collections of different element types is not yet supported. Selected serializers: [kotlin.String, kotlin.Int]

val query = hashMapOf<String,Any>(
    KEY_OTP to otp.toInt(),
    KEY_MOBILE to phone
)

This is what I’ve posted However I achieved the excepted result by sending a model class as

@Serializable
data class OTPRequest(
    val mobile : String,
    val otp : Int
)

But I was wondering, It’ll be a extra burden if I’m going to create multiple request classes Any solution will be helpful. thanks

Is it possible to install a feature dynamically? I’m looking into integrating a login feature through through an OAuth provider stating in its doc that endpoints should be fetch and not stored statically since they could (rarely) change over time. From what I see in the doc from Ktor, the OAuth configuration is done directly into the Application block and it’s static

Hello, I'm trying to get call logging to work with my new ktor application. Is the logback line ABSOLUTELY necessary? My more-java-and-kotlin-experienced coworkers don't want to add logback into our dependencies they want everything to go through slf4j, so right now I'm not getting any trace prints about calls that the server receives. So far I'm just using the netty engine. I followed the tutorial, and (simplified) I have:

fun main(args: Array<String>): Unit = io.ktor.server.netty.EngineMain.main(args)

fun Application.module(testing: Boolean = false) {
    install(ContentNegotiation) {
        json()
    }
    install(CallLogging)
    registerAccountRoutes()
    registerHealthRoutes()
}

The install ContentNegotiation works, but CallLogging isn't doing anything as far as I can tell.

What's the best way to use coroutines to launch work and then respond without waiting for the work to finish? Basically, I want to accept a request, validate it, launch work, and then respond that it was a valid request and work is being done. I don't need to have a callback for this. So like (pseodo-kotlin-ish)

route("/foo") {
  get("{bar}") {
    if not validFoo(call.parameters) return@get call.respondText("invalid", status = HttpStatusCode.BadRequest)
    launch { longRunningWorkIDontNeedAResponseFrom(call.parameters) }
    call.respondText("Started work")
  }
}

I know I'm using coroutine already, but...do I need to set up the coroutine scope? Can I share a thread pool with ktor?

I’m trying to publish my ktor app through docker by following this doc https://ktor.io/docs/docker.html#building-and-running-the-docker-image. When running

docker build -t my-app .

I’m getting this error message :

=> ERROR [3/4] COPY ./build/install/docker/ /app/                                                                                                                                             
------
 > [3/4] COPY ./build/install/docker/ /app/:
------
failed to compute cache key: "/build/install/docker" not found: not found

What am I doing wrong here?

There is a very weird issue coming up. I have all the plugins installed once. But when I try to run the project I get

Exception in thread "main" io.ktor.application.DuplicateApplicationFeatureException: Conflicting application feature is already installed with the same key as `CORS`

And the code looks like:

fun main() {
    embeddedServer(Netty, port = 8081, host = "0.0.0.0") {
        configureHTTP()
        configureOauth()
        configureRoutingAndSerialization()
        configureStatusPages()
    }.start(wait = true)
}

The weird part is: The first feature which is inside the blocks always throws the error. In this case is HTTP but if I take Oauth to first position it will throw exception of

Authentication

Hey folks, heads up, SSL pinning implementation crashes on iOS 11 because it uses SecCertificateCopyKey that’s only available starting iOS 12.

hey folks. how to mapping result from Ktor request into sealed class like bellow

sealed class NetworkResponse<out S : Any, out E : Any> {

    data class Success<S : Any>(
        val body: S,
        val code: Int
    ) : NetworkResponse<S, Nothing>()

    data class Error<E : Any>(
        val errorBody: E,
        val code: Int
    ) : NetworkResponse<Nothing, E>()

    data class Failure(val error: Exception) : NetworkResponse<Nothing, Nothing>()

}