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GraalVM example integration
Adds new `graalVM` composite build that ensures servers (ktor for now) can be build with GraphQL Kotlin plugin and produce valid GraalVM native image.
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‎.github/workflows/graalvm-integration.yml

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name: GraaLVM Integration Tests
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on:
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workflow_call:
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pull_request:
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branches:
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- master
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paths:
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- 'generator/**'
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- 'servers/**'
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- 'plugins/**'
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- 'integration/graalvm/**'
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jobs:
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graalvm-integration:
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timeout-minutes: 20
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runs-on: ubuntu-latest
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defaults:
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run:
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working-directory: integration/graalvm
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strategy:
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matrix:
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server: ['ktor-graalvm-server']
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steps:
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- name: Checkout Repository
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uses: actions/checkout@v3
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- name: Validate Gradle wrapper
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uses: gradle/wrapper-validation-action@v1
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- name: Setup GraalVM
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uses: graalvm/setup-graalvm@v1
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with:
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version: '22.3.1'
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java-version: '17'
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components: 'native-image'
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native-image-job-reports: 'true'
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- name: Set up Gradle cache
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uses: gradle/gradle-build-action@v2
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- name: Build server
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run: ./gradlew :${server}:build :${server}:nativeCompile
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env:
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server: ${{ matrix.server }}
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- name: Build and start the native image
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id: start_server
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run: |
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set -x
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echo "starting server"
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./${server}/build/native/nativeCompile/${server} &
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echo "SERVER_PID=$(echo $!)" >> $GITHUB_OUTPUT
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env:
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server: ${{ matrix.server }}
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- name: Integration Test
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run: |
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echo "sending a test query"
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curl --request POST \
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--verbose \
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--header 'content-type: application/json' \
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--url http://localhost:8080/graphql \
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--data '{"query":"query($inputArg: InputOnlyInput){ inputTypeQuery(arg: $inputArg) }","variables":{"inputArg": { "id": 123 }}}' \
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> response.json
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echo "received GraphQL response"
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cat response.json
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echo "verifying response"
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jq -e '.data.inputTypeQuery == "InputOnly(id=123)"' response.json
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- name: Stop server
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if: ${{ always() }}
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run: |
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echo "shutting down server"
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kill -9 ${{ steps.start_server.outputs.SERVER_PID }}

‎integration/graalvm/build.gradle.kts

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import java.util.Properties
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allprojects {
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repositories {
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mavenCentral()
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mavenLocal {
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content {
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includeGroup("com.expediagroup")
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}
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}
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}
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val properties = Properties()
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properties.load(File(rootDir.parentFile.parent, "gradle.properties").inputStream())
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for ((key, value) in properties) {
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if (!project.ext.has(key.toString())) {
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project.ext[key.toString()] = value
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}
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}
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}

‎integration/graalvm/gradle.properties

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group = com.expediagroup.graalvm
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org.gradle.jvmargs=-Xmx4g -XX:MaxMetaspaceSize=1g
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org.gradle.caching=true
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org.gradle.parallel=true
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‎integration/graalvm/gradle/wrapper

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../../../gradle/wrapper

‎integration/graalvm/gradlew

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../../gradlew

‎integration/graalvm/ktor-graalvm-server/build.gradle.kts

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import com.expediagroup.graphql.plugin.gradle.graphql
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import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
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@Suppress("DSL_SCOPE_VIOLATION") // TODO: remove once KTIJ-19369 / Gradle#22797 is fixed
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plugins {
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alias(libs.plugins.kotlin.jvm)
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application
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alias(libs.plugins.graalvm.native)
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id("com.expediagroup.graphql")
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}
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dependencies {
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implementation("com.expediagroup", "graphql-kotlin-ktor-server")
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implementation("com.expediagroup", "graphql-kotlin-hooks-provider")
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implementation(libs.logback)
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implementation(libs.ktor.server.cio)
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testImplementation(libs.junit.api)
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testImplementation(libs.kotlin.test)
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testImplementation(libs.ktor.client.content)
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testImplementation(libs.ktor.server.test.host)
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}
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tasks.test {
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useJUnitPlatform()
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}
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tasks.withType<KotlinCompile> {
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kotlinOptions.jvmTarget = "17"
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}
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application {
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mainClass.set("com.expediagroup.graalvm.ktor.ApplicationKt")
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}
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graalvmNative {
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toolchainDetection.set(false)
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binaries {
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named("main") {
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verbose.set(true)
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buildArgs.add("--initialize-at-build-time=io.ktor,kotlin,ch.qos.logback,org.slf4j")
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buildArgs.add("-H:+ReportExceptionStackTraces")
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}
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metadataRepository {
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enabled.set(true)
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}
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}
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}
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graphql {
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graalVm {
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packages = listOf("com.expediagroup.graalvm.ktor")
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}
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}

‎integration/graalvm/ktor-graalvm-server/src/main/kotlin/com/expediagroup/graalvm/ktor/Application.kt

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/*
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* Copyright 2023 Expedia, Inc
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.expediagroup.graalvm.ktor
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import com.expediagroup.graalvm.ktor.context.CustomContextFactory
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import com.expediagroup.graalvm.ktor.hooks.CustomHooks
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import com.expediagroup.graalvm.ktor.schema.ArgumentQuery
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import com.expediagroup.graalvm.ktor.schema.AsyncQuery
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import com.expediagroup.graalvm.ktor.schema.BasicMutation
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import com.expediagroup.graalvm.ktor.schema.ContextualQuery
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import com.expediagroup.graalvm.ktor.schema.CustomScalarQuery
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import com.expediagroup.graalvm.ktor.schema.EnumQuery
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import com.expediagroup.graalvm.ktor.schema.ErrorQuery
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import com.expediagroup.graalvm.ktor.schema.IdQuery
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import com.expediagroup.graalvm.ktor.schema.model.ExampleInterface
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import com.expediagroup.graalvm.ktor.schema.model.ExampleUnion
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import com.expediagroup.graalvm.ktor.schema.InnerClassQuery
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import com.expediagroup.graalvm.ktor.schema.ListQuery
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import com.expediagroup.graalvm.ktor.schema.PolymorphicQuery
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import com.expediagroup.graalvm.ktor.schema.ScalarQuery
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import com.expediagroup.graalvm.ktor.schema.TypesQuery
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import com.expediagroup.graalvm.ktor.schema.dataloader.ExampleDataLoader
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import com.expediagroup.graalvm.ktor.schema.model.FirstImpl
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import com.expediagroup.graalvm.ktor.schema.model.FirstUnionMember
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import com.expediagroup.graalvm.ktor.schema.model.SecondImpl
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import com.expediagroup.graalvm.ktor.schema.model.SecondUnionMember
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import com.expediagroup.graphql.dataloader.KotlinDataLoaderRegistryFactory
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import com.expediagroup.graphql.server.ktor.GraphQL
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import com.expediagroup.graphql.server.ktor.graphQLGetRoute
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import com.expediagroup.graphql.server.ktor.graphQLPostRoute
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import com.expediagroup.graphql.server.ktor.graphQLSDLRoute
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import com.expediagroup.graphql.server.ktor.graphiQLRoute
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import io.ktor.server.application.install
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import io.ktor.server.cio.CIO
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import io.ktor.server.engine.embeddedServer
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import io.ktor.server.routing.routing
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fun main() {
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embeddedServer(CIO, port = 8080, host = "0.0.0.0") {
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install(GraphQL) {
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schema {
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packages = listOf("com.expediagroup.graalvm.ktor")
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queries = listOf(
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ArgumentQuery(),
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AsyncQuery(),
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ContextualQuery(),
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CustomScalarQuery(),
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EnumQuery(),
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ErrorQuery(),
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IdQuery(),
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InnerClassQuery(),
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ListQuery(),
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PolymorphicQuery(),
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ScalarQuery(),
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TypesQuery()
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)
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mutations = listOf(
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BasicMutation()
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)
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hooks = CustomHooks()
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typeHierarchy = mapOf(
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ExampleInterface::class to listOf(FirstImpl::class, SecondImpl::class),
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ExampleUnion::class to listOf(FirstUnionMember::class, SecondUnionMember::class)
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)
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}
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engine {
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dataLoaderRegistryFactory = KotlinDataLoaderRegistryFactory(
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ExampleDataLoader
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)
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}
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server {
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contextFactory = CustomContextFactory()
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}
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}
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routing {
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graphQLGetRoute()
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graphQLPostRoute()
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graphQLSDLRoute()
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graphiQLRoute()
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}
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}.start(wait = true)
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}

‎integration/graalvm/ktor-graalvm-server/src/main/kotlin/com/expediagroup/graalvm/ktor/context/CustomContextFactory.kt

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/*
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* Copyright 2023 Expedia, Inc
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.expediagroup.graalvm.ktor.context
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import com.expediagroup.graphql.generator.extensions.plus
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import com.expediagroup.graphql.server.ktor.DefaultKtorGraphQLContextFactory
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import graphql.GraphQLContext
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import io.ktor.server.request.ApplicationRequest
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import java.util.UUID
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class CustomContextFactory : DefaultKtorGraphQLContextFactory() {
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override suspend fun generateContext(request: ApplicationRequest): GraphQLContext {
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return super.generateContext(request).plus(mapOf("custom" to (request.headers["X-Custom-Header"] ?: UUID.randomUUID().toString())))
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}
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}

‎integration/graalvm/ktor-graalvm-server/src/main/kotlin/com/expediagroup/graalvm/ktor/hooks/CustomHooks.kt

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/*
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* Copyright 2023 Expedia, Inc
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.expediagroup.graalvm.ktor.hooks
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import com.expediagroup.graphql.generator.hooks.SchemaGeneratorHooks
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import com.expediagroup.graphql.plugin.schema.hooks.SchemaGeneratorHooksProvider
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import graphql.language.StringValue
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import graphql.schema.Coercing
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import graphql.schema.CoercingParseLiteralException
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import graphql.schema.CoercingParseValueException
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import graphql.schema.CoercingSerializeException
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import graphql.schema.GraphQLScalarType
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import graphql.schema.GraphQLType
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import java.util.UUID
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import kotlin.reflect.KClass
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import kotlin.reflect.KType
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class CustomHooks : SchemaGeneratorHooks {
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override fun willGenerateGraphQLType(type: KType): GraphQLType? = when (type.classifier as? KClass<*>) {
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UUID::class -> graphqlUUIDType
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else -> null
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}
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}
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class CustomHooksProvider : SchemaGeneratorHooksProvider {
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override fun hooks(): SchemaGeneratorHooks = CustomHooks()
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}
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val graphqlUUIDType: GraphQLScalarType = GraphQLScalarType.newScalar()
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.name("UUID")
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.description("A type representing a formatted java.util.UUID")
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.coercing(UUIDCoercing)
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.build()
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object UUIDCoercing : Coercing<UUID, String> {
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override fun parseValue(input: Any): UUID = runCatching {
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UUID.fromString(serialize(input))
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}.getOrElse {
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throw CoercingParseValueException("Expected valid UUID but was $input")
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}
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override fun parseLiteral(input: Any): UUID {
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val uuidString = (input as? StringValue)?.value
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return runCatching {
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UUID.fromString(uuidString)
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}.getOrElse {
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throw CoercingParseLiteralException("Expected valid UUID literal but was $uuidString")
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}
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}
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override fun serialize(dataFetcherResult: Any): String = runCatching {
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dataFetcherResult.toString()
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}.getOrElse {
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throw CoercingSerializeException("Data fetcher result $dataFetcherResult cannot be serialized to a String")
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}
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}

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