Generate models for ktor example

rest-api-json-bulk/build.gradle.kts

@@ -1,12 +1,15 @@
 plugins {
     application
     kotlin("jvm")
+    id("org.openapi.generator") version "6.2.1"
 }
 
 val ktor_version : String by project
 val json_bulk_access_version: String by project
 val api_gen_version: String by project
 
+val openApiFile = layout.projectDirectory.file("../openapi/openapi.yaml")
+
 dependencies {
     implementation(project(":mps:solutions:University.Schedule.api"))
 
@@ -26,6 +29,42 @@ dependencies {
     implementation("org.modelix.mps.api-gen:runtime:$api_gen_version")
 }
 
+val basePackage = "org.modelix.sample.restapijsonbulk"
+
+// Use the OpenAPI generator to generate data classes representing the REST response data types.
+// Unfortunately, other generated artifacts cannot be used, because the generator still assumes
+// ktor 1.x and doesn't have an interfaceOnly mode such as in the Quarkus example.
+openApiGenerate {
+    generatorName.set("kotlin-server")
+    inputSpec.set(openApiFile.toString())
+    outputDir.set("$buildDir/openapi-generator")
+    packageName.set(basePackage)
+    // The OpenAPI generator gradle plugin is strange. According to the documentation of the generator itself,
+    // one has to specify `true` to generate all models. However, the plugin does something such that `true`
+    // is assumed to be the name of a specific model to generate only then. Strangely, specifying an empty
+    // string configures the plugin in such a way that all available models are generated and nothing else.
+    globalProperties.set(
+        mapOf(
+            "models" to "",
+        )
+    )
+    configOptions.set(
+        mapOf(
+            "library" to "ktor",
+        )
+    )
+}
+
+// Ensure that the OpenAPI generator runs before starting to compile
+tasks.named("processResources") {
+    dependsOn("openApiGenerate")
+}
+tasks.named("compileKotlin") {
+    dependsOn("openApiGenerate")
+}
+
+java.sourceSets.getByName("main").java.srcDir(file("$buildDir/openapi-generator/src/main/kotlin"))
+
 application {
     mainClass.set("org.modelix.sample.restapijsonbulk.ApplicationKt")
-}
+}

rest-api-json-bulk/src/main/kotlin/BulkApi.kt → rest-api-json-bulk/src/main/kotlin/org/modelix/sample/restapijsonbulk/BulkApi.kt

@@ -1,19 +1,7 @@
-/**
- * University.Schedule.api
- * No description provided (generated by Openapi Generator https://github.com/openapitools/openapi-generator)
- *
- * The version of the OpenAPI document: 1.0
- *
- *
- * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
- * https://openapi-generator.tech
- * Do not edit the class manually.
- */
 package org.modelix.sample.restapijsonbulk.models.apis
 
 import University.Schedule.structure.Courses
 import University.Schedule.structure.Rooms
-import com.google.gson.Gson
 import io.ktor.http.*
 import io.ktor.server.application.*
 import io.ktor.server.locations.*
@@ -44,9 +32,6 @@ object RouteHelper {
 }
 
 fun Route.BulkApi(loadRoots: suspend () -> List<INode>, resolve: suspend (INodeReference) -> INode?) {
-    val gson = Gson()
-    val empty = mutableMapOf<String, Any?>()
-
     get<Paths.getLectures> {
         val roots = loadRoots()
         val allLectures = roots.flatMap {
@@ -111,4 +96,4 @@ fun Route.BulkApi(loadRoots: suspend () -> List<INode>, resolve: suspend (INodeR
             call.respond(HttpStatusCode.NotFound, "Can not load Room: " + e.message)
         }
     }
-}
+}