Kotlin Fission

This small wrapper allows you to easilly run kotlin native functions in fission.io

Usage

Writing your function

Following the example of the simple echo function,

First add the dependency (com.vexdev:kotlin-fission) to your kotlin-native project:

repositories {
    mavenCentral() // <- Important!
}

kotlin {
    sourceSets {
        val nativeMain by getting {
            dependencies {
                implementation("com.vexdev:kotlin-fission:1.0.0")
            }
        }
    }
}

And then register your function in the main:

import fission.FissionFunction
import fission.Function
import fission.Header
import fission.Request

fun main() {
    FissionFunction.init(EchoFunction())
}

class EchoFunction : Function {
    override fun onCall(request: Request, headers: List<Header>): String {
        return "Content-Length: ${request.contentLength}\n" +
                "URI: ${request.uri}\n" +
                "Method: ${request.method}\n" +
                "--- BODY BEGINS ---\n" +
                "${request.content}\n" +
                "--- BODY ENDS ---\n"
    }
}

Deployment

Kotlin-fission requires a specialised environment in fission.io.

This environment is available on docker-hub and can be used as follows:

# First, create the environment
$ fission environment create --name kotlin --image vexdev/fission-kotlin-env --keeparchive --version 3

# Then, create your function
$ fission function create --name echo --env kotlin --code build/bin/native/releaseExecutable/EchoFunction.kexe

# And now, you can create routes
$ fission route create --url /echo --function echo
$ curl http://localhost:$PORT/echo

# Or you can test it directly with the CLI
$ fission function test --name echo -v2