Is it possible to create an operator function to overload

[from .. to]

on

ByteArray

to do something like this?

operator fun ByteArray.get(intRange: IntRange): Byte {
    val bytes = this.sliceArray(intRange)
    return ByteBuffer.wrap(bytes).getInt()
}

fun getID(data: ByteArray): Int = data[0..3] as Int

I don't think so, but just in case anyone has a clever idea. It would be so nice 😭

Ktor server side with Intellij idea....... OpenJDK version 18

👋 Hello, team!

Hi everyone, I apologize in advance if this is Not Kotlin, but I think it might be related so I figured I would give it a shot in this channel. I recently upgraded my app to Java 17 (from 1.8) and Kotlin 1.8.10 (from 1.6.10), and when we deployed it we saw a big spike in latency and rolled back. Using our profiling tool, I noticed that the JIT compiler was taking significantly longer in the new deployment, as was garbage collection. Has anyone run into an issue while attempting a version upgrade like this, or in general has advice on where to start troubleshooting this?

Hi, I have a question regarding the

application.conf

file when using

ktor.

I’m trying this for the first time so pardon me. I’ve created a conf file as follows:

ktor {
  deployment {
      port = 8080
  }

  application {
      modules = [ com.example.ApplicationKt.module ]
  }
}

jwt {
 "secret" = ${m_secret}
 "issuer" = "my_issuer"
 ….
}

I would like to extract the values for the

jwt

properties into an environment file so that i don’t publish my secrets into version control. What’s the best way to do this? I tried accessing the value of

${m_secret}

from a

dev.env

file which I set as

m_secret="secret"

but that didn’t work as I run into the following error:

Could not resolve substitution to a value: ${m_secret}

. Thanks in advance.

Hi, I have a Ktor App with

jOOQ

plugin and

Flyway

. I installed the

pg_partman

and

pg_cron

extensions on the local Postgres by creating a

Dockerfile.postgres

file and used it in the

docker-compose.yml

file. So I am able to run

pg_partman

and

pg_cron

functions on my local db. But the

generateJooqClasses

fails to run those functions

ERROR: function partman.create_parent(p_parent_table => unknown, p_control => unknown, p_type => unknown, p_interval => unknown, p_premake => integer, p_start_partition => unknown, p_template_table => unknown) does not exist
  Hint: No function matches the given name and argument types. You might need to add explicit type casts.

I guess because

generateJooqClasses

creates its own container which doesn’t have those extensions. Any idea how to make it work? How to make the extensions available in this container?

Hi 👋 What do you think about making a JPA entity

data class

? I know that equals and hashcode need to be overridden then, but what about "The entity class must not be final*"* rule from JPA Specification? It can be easily solved by all-open compiler plugin as well. However it looks weird in the bytecode

@javax.persistence.Entity public open data class

I already found an issue https://youtrack.jetbrains.com/issue/KT-34568/All-open-plugin-does-not-support-data-classes and the answer

breaking

data class

contracts will eventually bring more harm than good.

but I wonder what are the exact consequences of breaking the

data class

contract

Hello, everyone! What is the best way to generate OpenAPI docs basing on Ktor routings (already written)? There`s Ktor OpenAPI Generator (https://github.com/papsign/Ktor-OpenAPI-Generator), but the project seems not very active.

google-services.json

I get an error when I use a suspend function on Ios, I've tried some of the solutions such as adding something to gradle properties and libraries and it still does not worl

Hello, is there an idiomatic way of handling http patch requests in Kotlin(Ktor, etc)?

thoughts on Ktorm vs Exposed?

Hello, I’m looking to run some Kotlin code on a remote server that makes an api POST request every 24 hours and saves the result to a remote database. Im comfortable with the Kotlin code portion of what I’m trying to do but I have no experience with deploying code to a server to run continuously. Can anyone point me in the right direction? Are Google cloud functions a good solution for this?

Hello 👋 , I would need help about security. I’m working on app where I need to save in DB some third party access token. Since this information is sensitive I suppose I should encrypt and decrypt when needed. I understand for that I would need to generate a key and use it for encrypt de deencryption. However I’ve some trouble to understand how I should I save this generated key? (is there something provided by Ktor or should I handle it with Docker or the provider where the app is working on?) I would generate the key this way:

private fun getPasswordBasedKey(password: CharArray): Key {
    val salt = ByteArray(100)
    val random = SecureRandom()
    random.nextBytes(salt)
    val pbeKeySpec = PBEKeySpec(password, salt, 1000, 128)
    val pbeKey = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256").generateSecret(pbeKeySpec)
    return SecretKeySpec(pbeKey.encoded, "AES")
}

This message was deleted.

Hello, I would like to be able to manage authenticating my users through Firebase (Email/Password login & Google). However, I can't do the login route with the Firebase SDK. I want to generate a token with the email and password but there is no method to do so. Does anyone have an idea? Thanks

Hello everyone. I work on a Kotlin library that uses the Ubyte, UInt, and ULong types. A few Java devs have told us they cannot use our constructors because of these types which are not understood by Java, and so far the only solution I have seen to fix this is to write small Kotlin wrappers around our data classes which use unsigned types. I’m wondering if anyone here has other, Java-only solutions for how to work with these unsigned types. This would allow us to provide solutions that don’t rely on adding Kotlin to our Java users’ codebases. Thanks!

I’m looking at the viability of moving an app away from Dropwizard to Ktor (which is exciting), and seeing how difficult that is/isn’t - does anyone know what the correct way to validate type-safe resource route query params is? i.e. the things we currently get from hibernate validator,

min

,

max

etc - does it require a custom plugin to bridge, or I’m missing some way of doing this out of the box?

Bit of a lazyweb question, but does anyone know off the top of their head whether ktor or http4k make it easy to retrieve a list of all the endpoints they expose as a method / uri template pair?

hi there, does anyone know how to rearrange kotlin members in alphabetic order? i only see this option for Java code... is it possible?

Hello all, any recommendations for courses about ktor?

Hey guys I’m looking for a place to learn about Coroutines, but I search a place when I can learn about them deeply and in details. Knowing that I came from Java world and I’m comfortable with Threads and java.concurrency stuffs Could someone please recommend anything ?!

I've been watching several issues that have been collectively blocking me from migrating Kotlin projects to the Java Platform Module System. It's a major feature of the Java platform since version 9+ (version 17 is the current LTS), and notably is now required by JavaFX, so I'm a bit surprised there's not more votes and priority on these. Are others not using JPMS, or are you not running into these issues, or do you have workarounds for them? Here's the list (severity and status notes mine): • Kotlin Gradle Plugin ◦ https://youtrack.jetbrains.com/issue/KT-20740 ▪︎ Severity: Blocker. No way to specify JPMS overrides for modules implemented in Kotlin. ▪︎ Status: Unresolved. No known workaround. 5 years old. ◦ https://youtrack.jetbrains.com/issue/KT-55389 ▪︎ Severity: Blocker. Special Gradle configuration required. Intermittent build failures. ▪︎ Status: Unresolved. Workaround doesn't seem to work. ◦ https://youtrack.jetbrains.com/issue/KT-55200 ▪︎ Severity: Minor. Lack of sufficient documentation. ▪︎ Status: Unresolved. • IntelliJ ◦ https://youtrack.jetbrains.com/issue/IDEA-220886 ▪︎ Severity: Critical. Good code red in IDE. ▪︎ Status: Unresolved. No known workaround. 4 years old. ◦ https://youtrack.jetbrains.com/issue/IDEA-304601 ▪︎ Severity: Critical. Good code red in IDE. ▪︎ Status: Unresolved. No known workaround.

Not sure which channel to ask in. I’ve been updating to Kotlin 1.8.20 and noticed that default target jvm seems to be 11. I don’t see this anywhere in release notes https://kotlinlang.org/docs/whatsnew18.html and compiler options documentation still states it is Java 1.8: https://kotlinlang.org/docs/compiler-reference.html#jvm-target-version Anybody else noticed the change?

Hey, it begins to be possible to write server-side applications with Kotlin/Wasm with https://github.com/kowasm/kowasm, if you want to learn more: https://twitter.com/sdeleuze/status/1639588268151910401 (the server-side stuff is towards the end but it probably helps to get some context with the first part of the presentation before). Happy to listen your feedback or questions if you have any 🧵.

I'm not too experienced with Gradle/Maven, but have worked pretty comfortably using Bazel( and its derivative Buck). Currently trying to learn more about how to use Kotlin with these. What do most folks use here for building serverside kotlin and for kmm? Are there any best practices or guides that are recommended? Thank you in advance!

Hello guys! 🤙 All fine? Hehe. Guys, I am trying to implement a back-end with Ktor without using the JVM. In other words, I am trying to create a native back-end with Ktor. Is this possible, nowadays? What is the best way to get started? Thanks!