kotlinlang #ktor

curl -X GET -I <http://internal-sedna-LoadB-LZRRIJ6EII57-813909172.us-west-2.elb.amazonaws.com:8000/indexer/2019-11-01/_status|internal-sedna-LoadB-LZRRIJ6EII57-813909172.us-west-2.elb.amazonaws.com:8000/indexer/2019-11-01/_status>
HTTP/1.1 200 OK
Date: Fri, 01 Nov 2019 23:36:51 GMT
Content-Type: application/json; charset=UTF-8
Content-Length: 53
Connection: keep-alive
Server: Application/debug ktor/debug

coder82

11/04/2019, 11:31 AM

I want to Cbor.dump a class and I need to pass TestClass.serializer(), but the type I receive is Any, is there a way to get that TestClass.serializer() at runtime without testing the type with when/is? But it looks like to me there is no way to do that as .dump requires the <T> at compile time

Nikky

11/05/2019, 12:46 PM

i am trying to use kotlin-frontend in a multiplatform project and ktor seems to be blocking it because it tries to find it in npm.. is there any way around this?

npm ERR! No valid versions available for ktor-ktor-client-core

sendoav

11/06/2019, 8:30 AM

some calls are correctly received in the API and the HTTPMethod is correctly processed as GET Method, but other times the same call is catched in the API and the HttpMethod is “T”

bitkid

11/07/2019, 12:47 PM

hi! did anyone try using https://github.com/derveloper/kotlin-openapi3-dsl with ktor? any other attempts to generate openapi specs from the location API?

JoakimForslund

11/07/2019, 2:47 PM

What is the recommended way to forward http/https trafic from ktor server to another server?

martin.petrulak

11/08/2019, 11:01 AM

When i call both endpoins and my serializer looks like this (check order )

register(CocktailIngredientMatrix.serializer().list)
register(Ingredient.serializer().list)

I get error from

/cocktailIngredientMatrix

endpoint

RESPONSE <http://10.0.2.2:8080/cocktailIngredientMatrix> failed with exception: kotlinx.serialization.json.JsonDecodingException: Invalid JSON at 23: Encountered an unknown key cocktailID

When i change thh order to :

register(Ingredient.serializer().list)
 register(CocktailIngredientMatrix.serializer().list)

I get following error :

RESPONSE <http://10.0.2.2:8080/ingredients> failed with exception: kotlinx.serialization.json.JsonDecodingException: Invalid JSON at 41: Encountered an unknown key name

tylerwilson

11/08/2019, 3:42 PM

I am using Ktor on the client side, using

Parameters.apply { append(key, value) }

issue is that it is encoding spaces as ‘+’, whereas I need then as ‘%20’. Anybody know if there is a way to adjust this? Or perhaps (like Retrofit) there could be an ‘appendEncoded()’ type call? Thank you!

Shan

11/11/2019, 12:11 AM

Has anyone implemented a mp project that handles offline errors/timeout errors (not http status codes) in a result type with Ktor?

nrobi

11/11/2019, 11:17 AM

Hey, I’m using https://github.com/orangy/squash/tree/master/squash-core/src/org/jetbrains/squash for the db connection. I didn’t find any documentation regarding foreign keys, could anyone pin-point me in the right direction?

JoakimForslund

11/11/2019, 9:22 PM

Hi, tried to add ktor 1.2.5 in a multiplatform project(Using kotlin 1.3.50), which uses common, jvm and js targets and has the ktorClient attached as dependency. Now, I'm using dceJS to make everything small and neat. In order to make any sort of headroom with the

kotlinNpmInstall

, I had to add:

implementation(npm("bufferutil", "4.0.1"))
implementation(npm("utf-8-validate", "5.0.2"))
implementation(npm("text-encoding", "0.7.0"))

and add an file in the webpack.config.d folder containing:

config.node = { fs: 'empty' };

Now dceJs complains about: error: duplicate target file will be created for 'E:\gloot\glootxr\build\js\node_modules\node-gyp-build\index.js' and 'E:\gloot\glootxr\build\js\node_modules\bufferutil\index.js' The code using ktor is being written in common Any pointers on how to fix this?

Kurt Renzo Acosta

11/13/2019, 8:16 AM

Hello. Anyone experiencing issues with the default response validator? Ktor can't seem to catch my 404 errors.

jeggy

11/13/2019, 8:58 PM

are there any examples on how to create a ktor

Feature

which would add a route to the RoutingFeature?

wilyarti

11/15/2019, 7:56 AM

I want to launch 10 concurrent http client requests at a time similar to this: https://ktor.io/clients/index.html But I am having problems with errors killing the parent coroutine and all the children. Does anyone have an example of a work/children coroutines with error handling?

Jørund Amsen

11/15/2019, 8:54 AM

Is there a possibility to allow several connectors on the MainEngine-configs? As it is now, they only allows one https and one http connector. However we use a different port for our metrics so that we don't need to expose it outside Kubernetes. The way it's been solved now is a full-copy of the EngineMain-class and

commandLineEnvironment()

as we use almost all the default config there. Or differently asked; is there a particular reason why you don't support several connectors in the MainEngine/commandLineEnvironment? 🙂

rocketraman

11/15/2019, 6:56 PM

The behavior of HTTP servers in the presence of these half-closed connections is... undefined {1], and most clients do not do it. [1] https://github.com/httpwg/http-core/issues/22

kevin.cianfarini

11/16/2019, 6:38 PM

any idea why the ktor client would be messing with a URL encoded param list? My request looks like this

<https://torrent.ubuntu.com/announce?uploaded=0&downloaded=0&compact=1&info_hash=%65%14%5e%d4%d7%45%cf%c9%3f%5f%fe%34%92%e9%cd%e5%4b%55%7d%9f&peer_id=-CR0001-012345678901&port=6998&left=2082816000>

but when I inspect the request in ktor via

HttpClientCall#request#url

it shows this

<https://torrent.ubuntu.com/announce?uploaded=0&downloaded=0&compact=1&info_hash=e%14%5E%EF%BF%BD%EF%BF%BDE%EF%BF%BD%EF%BF%BD%3F_%EF%BF%BD4%EF%BF%BD%EF%BF%BD%EF%BF%BD%EF%BF%BDKU%7D%EF%BF%BD&peer_id=-CR0001-012345678901&port=6998&left=2082816000>

PHondogo

11/16/2019, 7:43 PM

Hello! What is the best practice to use HttpClient? Is it normal to create singelton instanse of it and use for the application lifecycle? Or I should create one for each call?

Animesh Sahu

11/17/2019, 2:24 PM

How to start embedded server without blocking the thread? Using coroutines

Jonathan Mew

11/18/2019, 2:29 PM

Ktor client (Apache) seems to have got into a bad state - any likely causes? Stacktrace attached.

Ran Magen

11/19/2019, 12:19 AM

Hey, has anyone implemented graceful shutdowns with Ktor? I'm looking for a way to "drain" ongoing requests before the process shuts down after being sent a

SIGTERM

. I can implement this myself, though if there's already a commonly used feature, I'd opt to not re-invent the wheel. My general idea is to set some boolean like

stopRequested

when getting a

SIGTERM

and maintain another

var active: Int

with the current number of active requests similar to https://github.com/ktorio/ktor/blob/master/ktor-features/ktor-metrics/jvm/src/io/ktor/metrics/dropwizard/DropwizardMetrics.kt#L22 so when that number hits 0 and

stopRequested

is true, only then finish the process.

darkmoon_uk

11/19/2019, 5:29 AM

Any word on the imminence of a Ktor companion release to 1.3.60?

darkmoon_uk

11/19/2019, 5:29 AM

Ktor 1.2.5 + Kotling 1.3.60 = 😞

😢 3

Hexa

11/19/2019, 6:32 PM

anyone seen this error before?

Caused by: java.lang.IllegalArgumentException: Response pipeline couldn't transform 'class java.util.Collections$SingletonMap' to the OutgoingContent
	at io.ktor.server.engine.BaseApplicationResponse$Companion$setupSendPipeline$1.invokeSuspend(BaseApplicationResponse.kt:271)
	at io.ktor.server.engine.BaseApplicationResponse$Companion$setupSendPipeline$1.invoke(BaseApplicationResponse.kt)
	at io.ktor.util.pipeline.SuspendFunctionGun.loop(PipelineContext.kt:268)
	at io.ktor.util.pipeline.SuspendFunctionGun.access$loop(PipelineContext.kt:67)
	at io.ktor.util.pipeline.SuspendFunctionGun.proceed(PipelineContext.kt:141)
	at io.ktor.util.pipeline.SuspendFunctionGun.execute(PipelineContext.kt:161)
	at io.ktor.util.pipeline.Pipeline.execute(Pipeline.kt:27)

Thomas

11/20/2019, 8:52 PM

How can you read the response in the

scope.receivePipeline.intercept

lambda without closing the original, so the pipeline can continue as normal?

nrobi

11/21/2019, 7:30 AM

Hey, when adding

kodein

ktor

, :gradle: fails to resolve

kodein-di-framework-ktor-server-jvm:6.3.4

. However it doesn’t have any problem with

kodein-di-generic-jvm

. Anyone with a similar issue?

darkmoon_uk

11/21/2019, 7:46 AM

Does Ktor CI publish to any pre-release repository where I can access,

1.3.0-beta-2-SNAPSHOT

- which master was upgraded to around 12 hours ago? It's not listed on their VCS page as far as I can see.

Matthias R

11/21/2019, 4:59 PM

Hey guys, I am basically doing a post request with ktor httpClient and I get back a HttpResponse successfully. With that I can see the response status and headers but I cannot see the body. How can I find the body?

Animesh Sahu

11/22/2019, 11:16 AM

Somebody tried build today, i'm having some issues building my app https://github.com/ktorio/ktor/issues/1455

Jørund Amsen

11/22/2019, 11:28 AM

So I'm trying to adapt some javax.servlet.Filter to be used in a interceptor. However it uses thing such as ServletRequest/Response. Are these available somehow? Or does ktor build on someting different?

Title

Jørund Amsen

11/22/2019, 11:28 AM

11/22/2019, 11:30 AM

It is available but not recommended because you loose portability

Jørund Amsen

11/22/2019, 11:31 AM

Yeah, I was afraid of that. Are there any known ways to work with javax Filters?

11/22/2019, 11:31 AM

(call.request as ServletApplicationRequest).servletRequest

same for response

What filter do you need to adopt?

Jørund Amsen

11/22/2019, 11:32 AM

In this case it's an internally made logging and access filter. We've mostly used Spring for now, and a lot of former work would be unusable with Ktor

11/22/2019, 11:32 AM

Ah, may be it is slightly more difficult because of routing...

Jørund Amsen

11/22/2019, 11:32 AM

How so?

11/22/2019, 11:36 AM

Right, routing wraps application calls to provide

route

property so the original call is hidden

However, it you intercept before routing, the code above should work well. Otherwise, you need more tricks

Jørund Amsen

11/22/2019, 11:38 AM

Yeah, that was my intention at least. I'll see if I can get it to work. Still way out on a limb when it comes to my understanding of Ktor. Thanks for the quick respons!

11/22/2019, 11:38 AM

The idea is to hide the underlying engine details, so you can run your app on any engine

Jørund Amsen

11/22/2019, 11:38 AM

Oh, one more thing, while I have you here, heh. https://kotlinlang.slack.com/archives/C0A974TJ9/p1573808069261300 Could I possibly open an issue on this? Multiple connectors support, that is

11/22/2019, 11:39 AM

for example, run on netty locally and deploy as war to Tomcat for prod

Jørund Amsen

11/22/2019, 11:39 AM

Yeah, that makes sense..

But are these servlet-classes engine-spesific?

11/22/2019, 11:40 AM

Yes, of course

This is why you need to cast to adopt to javax.servlet

Jørund Amsen

11/22/2019, 11:40 AM

Oh shit, yeah I just checked the inheritance. My bad

11/22/2019, 11:40 AM

You don't have these classes with no ktor-server-servlet dependency

Jørund Amsen

11/22/2019, 11:41 AM

Thanks, that actually clears things up a lot

11/22/2019, 11:42 AM

Regarding connectors.. I see no reason for not supporting multiple connectors in config. We just provided two for plain and TLS/SSL since it is the most useful case

Jørund Amsen

11/22/2019, 11:43 AM

I don't mind attempting a PR or issue, whatever is best for you. Is there anything in particular I should consider?

11/22/2019, 11:44 AM

If you think of PR, a change should be backward-compatible so older configuration files should keep working

Jørund Amsen

11/22/2019, 11:45 AM

Yep. Would a "unlimited" amount of connectors be allowed, or are there specific types of connectors, similar to TLS(or metrics?) that should be allowed?

11/22/2019, 12:00 PM

There is no limit, only two kinds are supported: pure HTTP and HTTPS

Jørund Amsen

11/22/2019, 12:00 PM

Yeah, it was more a question of "a metrics port", or "however many more ports you want"

11/22/2019, 12:02 PM

Of course you may configure a dedicated connector for the specific purpose such as administration

However, you need to configure your routing to filter by port, otherwise all ports will behave the same

Jørund Amsen

11/22/2019, 12:04 PM

Yep, I kind of already adapted the EngineMain in our app to do something similar. From what I understand, the port under

deployment{}

seems to be the default if I don't use any

port(){}

Is that correct?

11/22/2019, 12:09 PM

This is no longer true. Either port or sslPort should be specified

https://github.com/ktorio/ktor/blob/master/ktor-server/ktor-server-host-common/jvm/src/io/ktor/server/engine/CommandLine.kt#L129

Jørund Amsen

11/22/2019, 12:09 PM

Oh, is this a recent change?

Oh, no I mean

When I just do a normal routing

Similar to...

fun Routing.metrics() {
    port(8181) {
        get("/prometheus") {
            call.respondText { prometheusMeterRegistry.scrape() }
        }
    }

In this case, I spesify the port. However, if I don't spesify the port here, it defaults to the port in

deployment {
    port = 8080
}

So it seems there is a "default" connector, however many connectors I have

Does that make sense?

11/22/2019, 12:12 PM

These are irrelevant. The

port

function just adds a filter node

If no

port()

in routing then no filter applied so all ports are handled

Jørund Amsen

11/22/2019, 12:13 PM

Aaaah, okay yeah that makes a lot more sense

Thanks for being awesome Sergey! 😄 Keep rocking

11/22/2019, 12:13 PM

irrelevant -> independent

So, if one deploy into a servlet container, you can't control connectors at all

Jørund Amsen

11/22/2019, 12:14 PM

Yeah

11/22/2019, 12:14 PM

but you can add port routing anyway

Jørund Amsen

11/22/2019, 12:14 PM

That makes sense

11/22/2019, 12:15 PM

So, a routing is a decision tree. Every node of that tree may have a predicate

So when a call is started, it comes though the pipeline, then a routing is called (if installed, it's actually optional). If routing finds a node that matches, the corresponding handler is invoked

Jørund Amsen

11/22/2019, 12:20 PM

I see

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