AWS Lambda powered by Kotlin

Simple implementation for AWS Lambda Function with Kotlin with Blue/Green deployment using AWS CodeDeploy.

Getting Started

Requirements

Currently AWS Lambda Java runtime supports Java 11 (amazon-corretto-11)

• Amazon Corretto 11

Clone repository

git clone https://github.com/kopkunka55/aws-lambda-kotlin-ddb-stream-consumer
cd aws-lambda-kotlin-ddb-stream-consumer

Build Kotlin Lambda function using Gradle

Add the following gradle script to generate an executable .jar file

tasks.jar {
    manifest {
        attributes["Main-Class"] = "MainKt"
    }
    configurations["compileClasspath"].forEach { file: File ->
        from(zipTree(file.absoluteFile))
    }
    duplicatesStrategy = DuplicatesStrategy.INCLUDE
}

Execute the following command to build Kotlin function, or just run [Gradle] -> [Tasks] -> [build]

./gradlew build

Once Gradle build is done. JAR artifact file will be available at build/libs/aws-lambda-kotlin-1.0-SNAPSHOT.jar. The file can be referenced from Terraform to deploy AWS Lambda function.

Initial Deployment

Initialize terraform modules

cd aws
terraform init

check what terraform create or update

terraform plan

deploy to remote resources

terraform apply

Continues Deployment

Terraform automatically maps the current Lambda version to the alias defined at initial deployment step, and then traffic balance between current and previous version will be shifted gradually by AWS CodeDeploy.

./gradlew build
terraform apply

Pre-defined Lambda Deployment Strategy