is it possible to access a file which is part of a multipart request in a streaming way? (without being written to disk/memory) It seems when i do call.receiveMultipart() and then loop over the parts, it returns the part only when it has been completely written. Any way to avoid that?

Here’s a teaser of what’s going on

Hi all I've shared a small demonstration project in Github about a basic Ktor API server with a clean architecture. I would really appreciate some feedback about it. It is handling multiple environment configurations, content negotiation, jwt authentication and database connection. It is also including docker compose deployment file to be plug and play. Right now I'm working in creating test examples for each layer. I hope you like it and it can be helpful for those starting with this amazing tool. I'm open so solve doubts and help if you start your project following this architecture. Thank you! https://github.com/mathias21/KtorEasy

Is it possible to have modules in a different sourcefolder than the starting engine? When i set a 2nd sourcefolder in the projectsettings and add a module there I can't add this module to the config. It can't find the fully qualified name, but when I place the same module in the same sourcefolder as the engine starting module it works without a problem. Is there a way to add module from different sourcefolders? The idea behind this is to create small modules which can be switched in and out of a greater environment and having one mainmodule which installs the necessary features.

Hello, how can I retrieve a session arbitrarily? That is, I have sessions using a header, everything being stored on the server, the client only transmits a session ID in the header. I need to be able to retrieve the session with its ID without the header being in the call. How can I do that? In other words, how can I retrieve any session given only the session's ID?

@Serializable
class SomeRequestBody(
    @SerialName("name_field")
    val name: String?
)

In KTOR Server, I have defined EP with such a request body. The problem is, that it works, if json looks like:

{
  "name": "some-name-string"
}

but does not work if im trying to do the same with

{
  "name_field": "some-name-string"
}

Do you know how to fix it? P.S. Content negotiation is enabled in application module like

install(ContentNegotiation) {
   gson {
      setPrettyPrinting()
   }
}

Thank you in advance

i am using ktor-client-websockets and i cannot get the websocket to close cleanly, not sure if it is my fault or the server not responding to close frames..

client.websocket(host, port, path) {
    for(frame in incoming) {
        // a `break` somewhere in here
    }
 
    close(CloseReason(CloseReason.Codes.GOING_AWAY, "OK"))
    <http://logger.info|logger.info> { "sent close" }
}
<http://logger.info|logger.info> { "websocket closed" }

i see the

sent closed

log message but after that it hangs is there any other way to close the websocket ? PS: seems like it works better when not using CIO engine maybe such incompabilities should be put in the docs ?

as a ktor feature, what would be the correct way to add my own custom StatusPages for my specific exceptions? I have a feature that attaches it self to the routing feature, but I don't know how to attach to the StatusPages feature also without interfering with anything else that the user has set up for their own other stuff.

If a user logs out of your ktor app, how do you prevent the browser’s “back button” from letting them back in?

I want to deploy the ktor server in places like aws or Azure, is there a related example?

Hello everyone, I got problems with deploy my Ktor application to Google App Engine. I followed this tutorial, which is from Google Cloud Community, I stuck with gradle setting. It showed “Could not get unknown property ‘appengineRun’ for root project” at last line of the gradle. Here is my gradle

buildscript {
    repositories {
        jcenter()
    }

    dependencies {
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath "com.google.cloud.tools:appengine-gradle-plugin:$appengine_plugin_version"
    }
}

apply plugin: 'kotlin'
apply plugin: 'war'
apply plugin: 'application'
apply plugin: 'com.google.cloud.tools.appengine'

appengine.deploy.projectId = 'GCLOUD_CONFIG'
appengine.deploy.version = 'GCLOUD_CONFIG'

group 'dev.hankli'
version '1.0.0'
mainClassName = "io.ktor.server.netty.EngineMain"

sourceSets {
    main.kotlin.srcDirs = main.java.srcDirs = ['src']
    test.kotlin.srcDirs = test.java.srcDirs = ['test']
    main.resources.srcDirs = ['resources']
    test.resources.srcDirs = ['testresources']
}

webAppDirName = 'webapp'

repositories {
    mavenLocal()
    jcenter()
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
    implementation "io.ktor:ktor-server-netty:$ktor_version"
    implementation "ch.qos.logback:logback-classic:$logback_version"
    implementation "io.ktor:ktor-server-core:$ktor_version"
    implementation "io.ktor:ktor-locations:$ktor_version"
    implementation "io.ktor:ktor-server-sessions:$ktor_version"
    implementation "io.ktor:ktor-auth:$ktor_version"
    implementation "io.ktor:ktor-auth-jwt:$ktor_version"
    implementation "io.ktor:ktor-gson:$ktor_version"
    implementation 'com.google.firebase:firebase-admin:6.14.0'
    implementation "com.desmondtzq.ktor:ktor-auth-firebase:1.0.1"
    testImplementation "io.ktor:ktor-server-tests:$ktor_version"

    implementation "org.jetbrains.exposed:exposed-core:$exposed_version"
    implementation "org.jetbrains.exposed:exposed-dao:$exposed_version"
    implementation "org.jetbrains.exposed:exposed-jdbc:$exposed_version"
    implementation "org.jetbrains.exposed:exposed-jodatime:$exposed_version"
    implementation "org.postgresql:postgresql:$postgres_version"
    implementation "com.zaxxer:HikariCP:$hikaricp_version"

    providedCompile "com.google.appengine:appengine:$appengine_version"
}

task run(dependsOn: appengineRun) // Could not get unknown property 'appengineRun' for root project

And I’ve tried to use the Cloud Code plugin in IntelliJ IDE to run my code and there was an error that showed “Please first confirm that there is a properly placed appengine-web.xml file”, even though I’ve set the directions. Is anyone can help me out or give me some suggestions, really appreciate.🙏

Hey guys, I have a quick question. What library do you use for autogeneration of api documentation? I would like to get a list of endpoint + models or something in this direction. I tried using Ktor-OpenAPI-Generator but it doesn't seem to be working that well with Ktor Locations. Any alternatives?

When is the next release?

Is it possible to do server-side rendering of an angular app in ktor? If yes, is there a guide on how to do it?

hey guys, has anyone tried using ktor

1.3.2-1.4.0-rc

? I’ve updated my kotlin version and ktor version in gradle, but gradle fails to build with the below. This is strange, because I can see these in maven central (which I have declared to use in my build config):

repositories {
    mavenLocal()
    jcenter()
}

Could anyone give me a hand here?

Which converter should I use to receive data from a form as an object, I use thymeleaf as a template engine, After using the

GsonConvert

install(ContentNegotiation) {
    register(ContentType.Any, GsonConverter())
}

The statement generate an exception.

post("save") {
    val data = call.receive<MyClass>()
}

BIG Question: What do yall do for front end frameworks with Ktor? I heard KotlinJS isn't really being developed or might be retired, I never really got it working with ktor. I don't get why ktor has CSS and HTML DSL inherent but not js. So what do people do for front end, just create JS files in the resources folder? For libraries that makes sense I guess but not custom frontend code, and I wouldn't mind moving away from JS. I mean if I write in JS why would someone write in kotlin HTML/CSS, module parts would end up isolated most likely. Trying to understand real world practical solutions, modern too... options. Assume I'm making a site like Wix, so I might use stuff like grapeJS and 3D junk.

<!here> One of the things folks have asked us for is more insight into what we’re planning for Ktor. Here’s a roadmap for 2020-2021 https://blog.jetbrains.com/ktor/2020/08/10/ktor-roadmap-for-2020-2021/

"Our next release, which is 1.4.0, is targeted for the week of August 17th. This release will be compatible with the upcoming Kotlin 1.4 release" Will this have support for

native-mt

version of kotlinx coroutines (assuming that's still branch in 1.4....though I guess (hope) it might be in "official" version by then?)

Hey everyone, not sure if this is the right place to ask (my apologies if this is not the right place) - has anyone tried using Koin with Ktor, and creating a scope that lasts for the duration of a request? For example, if I wanted to be able to inject something like a trace id, how would I go about doing that? Thanks!

How does implement(npm("[three.js route]")) work? I mean, can you then import this into the KotlinJS and use it somehow, how do I develop static routes for this in ktor? I have my JS packages working in KotlinJS by putting them in resources before creating the fat jar.

browserdevelopmentrun is a task that I think comes from KotlinJS plugin. I think it runs the front end only, but then how does this really provide any usefulness when routing is in the backend Ktor? ie. I have the task config, what url do I go to to see the page?

target {
    browser {
        webpackTask {
            outputFileName = "MyProjectName.js"
        }
        runTask {
            dependsOn("build")
            devServer = devServer?.copy(
                port = 8088,
                proxy = mapOf("/api" to "<http://localhost:8080>")
            )
        }
    }
}

What do yall use for user managment? Wondering if I need to program basic user management again for the billionth time... in the millionth language, lol... or if a package exists.

Hi guys, how can I switch my different configurations when running a Ktor application? I want to know both of in IntelliJ and command line.

Is there a better way to make the front end kotlinJS talk to the backend Ktor than this:

Hi Everyone 🙂 This is my first post here! I have been trying to figure out how to upload a file to S3 using bits and pieces that I found online, but just can't get it to work. I want to use

call.receiveMultipart()

and then use the input stream, but when I test using postman it just hangs and doesn't fail with an error. In Gradle I have:

// AWS S3
  implementation platform('com.amazonaws:aws-java-sdk-bom:1.11.7')
  implementation 'com.amazonaws:aws-java-sdk-s3'

For the S3 client and upload function I am using:

private val s3Client = AmazonS3Client(
    BasicAWSCredentials(S3_ACCESS_KEY_ID, S3_SECRET_ACCESS_KEY)
  ).apply {
    withRegion<AmazonWebServiceClient>(Regions.US_EAST_1)
    setS3ClientOptions(
      S3ClientOptions.builder()
        .setPathStyleAccess(true).build()
    )
  }


fun uploadFileToS3(key: String, inputStream: InputStream, metadata: ObjectMetadata): PutObjectResult =
   s3Client.putObject(BUCKET_NAME, key, inputStream, metadata)

Then the route is calling:

val multiPartData = call.receiveMultipart()

        multiPartData.forEachPart { part ->
          when (part) {
            is PartData.FileItem -> {

              val key = "profile-image/${part.originalFileName ?: "unknown-file"}"

              part.streamProvider()
                .use { inputStream ->

                  val bytes: ByteArray = IOUtils.toByteArray(inputStream)
                  val metadata = ObjectMetadata()
                  metadata.contentLength = bytes.size.toLong()
                  val byteArrayInputStream = ByteArrayInputStream(bytes)

                  AwsS3.uploadFileToS3(
                    key,
                    byteArrayInputStream,
                    metadata
                  )
                }
            }
            else -> call.respond(HttpStatusCode.InternalServerError, JSONObject(mapOf("err" to "Error uploading file")))
          }
        }

        call.respond(
          HttpStatusCode.OK,
          JSONObject(mapOf("msg" to "Image uploaded successfully"))
        )

Hoping someone can spot where I'm going wrong 🙂 Thanks!

Hi, what dependency should I specify to be able to use Ktor client on ios in common module with kotlin 1.4-rc? i’ve tried

implementation("io.ktor:ktor-client-core:1.3.2-1.4.0-rc")

but it was not enough, it wants engine so i’ve tried

implementation("io.ktor:ktor-client-cio:1.3.2-1.4.0-rc")

but it doesn’t work 😞

@Serializable
data class Reader(
        var name : String = "",
        var photoUrl : String = "",
        var address : Address = Address())

Kotlinx Serialization setup

What's current recommended approach for using Swagger and Ktor? I see there's a few plugins but some don't seem to be being maintained. Also, seems to be a few approaches e.g. auto generate swagger json from routes, or for example visa versa.