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aws-lambda-vertx-native

Custom Vert.x Native for AWS Lambda

Disclaimer - This project should be considered a POC and has not been tested or verified for production use. If you decided to run this on production systems you do so at your own risk.

Building this Runtime

Prerequisites

Make sure you have the following installed on your build machine before getting started.

  • GraalVM
  • AWS CLI
Compile the Runtime Classes
$ ./mvnw package

Create the Lambda Custom Runtime Entry Point

AWS Lambda Custom Runtimes require an executable file in the root directory named simply bootstrap. This can be any executable file, for our case we're going to just use a shell script to call our launcher that we created in the step above. This script will do nothing more than invoke our Java Runtime from the dist folder.

Create the bootstrap script
$ touch boostrap
Call our Java Runtime from Bash

Add the following commands to the bootstrap

#!/bin/sh
/opt/target/lambda

Note that the path we're using in our shell script is /opt. When you create a Lambda Layer, as we'll do shortly, AWS Lambda copies all the runtime files to the /opt directory. This directory is effectively the home directory for our custom runtime.

Make bootstrap executable
$ chmod +x bootstrap
Create a deployment package

In the root of the folder containing our bootstrap and target/lambda files, create a zip archive containing the artifacts.

$ zip -r function.zip bootstrap target/lambda

Deploying to AWS Lambda

Create a lambda role

aws iam create-role \
    --role-name lambda-role \
    --path "/service-role/" \
    --assume-role-policy-document file:///tmp/trust-policy.json

Where the file /tmp/trust-policy.json contains:

{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "Service": "lambda.amazonaws.com"
      },
      "Action": "sts:AssumeRole"
    }
  ]
}

Publish a lambda layer

aws lambda publish-layer-version \
    --layer-name vertx-native-example \
    --zip-file fileb://function.zip

Create a function

aws lambda delete-function --function-name vertxNativeTester

aws lambda create-function --function-name vertxNativeTester \
    --zip-file fileb://function.zip --handler lambda.EchoLambda --runtime provided \
    --role arn:aws:iam::985727241951:role/service-role/lambda-role

Link the layer to the function

aws lambda update-function-configuration --function-name vertxNativeTester --layers arn:aws:lambda:eu-central-1:985727241951:layer:vertx-native-example:8

Test it

aws lambda invoke --function-name vertxNativeTester  --payload '{"message":"Hello World"}' --log-type Tail response.txt | grep "LogResult"| awk -F'"' '{print $4}' | base64 --decode

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