Kotlin compiler server

A REST server for compiling and executing Kotlin code. The server provides the API for Kotlin Playground library.

How to start 🏁

Simple Spring Boot application

Download Kotlin dependencies and build an executor before starting the server:

$ ./gradlew build -x test 

Start the Spring Boot project. The main class: com.compiler.server.CompilerApplication

With Docker

To build the app inside a Docker container, run the following command from the project directory:

$ ./docker-image-build.sh

From Amazon lambda

Based on aws-serverless-container.

$ ./gradlew buildLambda

Getting .zip file from build/distributions.

Lambda handler: com.compiler.server.lambdas.StreamLambdaHandler::handleRequest.

Publish your Lambda function: you can follow the instructions in AWS Lambda's documentation on how to package your function for deployment.

From Kotless

Add Kotless and remove aws-serverless-container =)

API Documentation 📃

Swagger url: http://localhost:8080/swagger-ui/

How to add your dependencies to kotlin compiler 📚

Just put whatever you need as dependencies to build.gradle.kts via a task called kotlinDependency:

 kotlinDependency "your dependency"

NOTE: If the library you're adding uses reflection, accesses the file system, or performs any other type of security-sensitive operations, don't forget to configure the executor.policy . Click here for more information about Java Security Policy.

How to set Java Security Policy in executors.policy

If you want to configure a custom dependency, use the marker @LIB_DIR@:

grant codeBase "file:%%LIB_DIR%%/junit-4.12.jar"{
  permission java.lang.reflect.ReflectPermission "suppressAccessChecks";
  permission java.lang.RuntimePermission "setIO";
  permission java.io.FilePermission "<<ALL FILES>>", "read";
  permission java.lang.RuntimePermission "accessDeclaredMembers";
};

CORS configuration

Set the environment variables

ENV	Default value
ACCESS_CONTROL_ALLOW_ORIGIN_VALUE	*
ACCESS_CONTROL_ALLOW_HEADER_VALUE	*

Configure logging

We use prod spring active profile to stream logs as JSON format. You can set the spring profile by supplying -Dspring.profiles.active=prod or set env variable SPRING_PROFILES_ACTIVE to prod value.

Unsuccessful execution logs

In case of an unsuccessful execution in the standard output will be the event with INFO level:

{
  "date_time": "31/Aug/2021:11:49:45 +03:00",
  "@version": "1",
  "message": "Code execution is complete.",
  "logger_name": "com.compiler.server.service.KotlinProjectExecutor",
  "thread_name": "http-nio-8080-exec-1",
  "level": "INFO",
  "level_value": 20000,
  "hasErrors": true,
  "confType": "JAVA",
  "kotlinVersion": "$kotlinVersion"
}

Kotlin release guide 🚀

1. Update the kotlin version in libs.versions.toml
2. Make sure everything is going well via the task:

$ ./gradlew build

3. Save branch with the name of the kotlin version. Pattern: /^[0-9.]+$/ (optional)
4. Bump version on GitHub releases (optional)

Gradle Build Scans

Gradle Build Scans can provide insights into an Kotlin Compiler Server Build. JetBrains runs a Gradle Develocity server. that can be used to automatically upload reports.

To automatically opt in add the following to $GRADLE_USER_HOME/gradle.properties.

org.jetbrains.kotlin.compiler.server.build.scan.enabled=true
# optionally provide a username that will be attached to each report
org.jetbrains..kotlin.compiler.server.build.scan.username=John Wick

Also you need to create an access key:

./gradlew provisionDevelocityAccessKey

A Build Scan may contain identifiable information. See the Terms of Use https://gradle.com/legal/terms-of-use/.