Spark Lambda

Overview

Spark Lambda is a POC for an "API Gateway" for AWS lambda functions that could be useful in some cases where calling lambdas might be otherwise difficult.

The POC is implemented as Sparkjava application that is built with Maven and produces a "fat" .jar file.

Prerequisites

For your environment you're going to need Java 1.8 and Maven 3.5.3.

In addition to the environment you need an AWS account with programmatic access and suitable IAM policies attached to it.

You can use for example the following policy as a directly attached inline policy:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "VisualEditor0",
            "Effect": "Allow",
            "Action": [
                "lambda:InvokeFunction",
                "lambda:ListVersionsByFunction",
                "lambda:GetFunction",
                "lambda:ListAliases",
                "lambda:GetFunctionConfiguration"
            ],
            "Resource": "arn:aws:lambda:*:*:function:*"
        },
        {
            "Sid": "VisualEditor1",
            "Effect": "Allow",
            "Action": [
                "lambda:ListFunctions",
                "lambda:ListEventSourceMappings"
            ],
            "Resource": "*"
        }
    ]
}

Finally, you need some lambdas on your account!

Instructions

Execute the following steps in your terminal to launch the application:

mvn clean package
java -jar target/sparklambda.jar -k your_aws_key_here -s your_aws_secret_here -r your_aws_region_here

The application will launch and port will be visible on the output