Gradle AWS SAM Deployer Plugin

This plugin allows for the convenient deployment of Serverless Application Model (SAM) CloudFormation Templates for lambda based serverless applications from within a Gradle project.

This plugin is inspired by the official AWS CLI, specifically the package (code / description) and deploy (code / description) commands which are described in AWS's Introducing Simplified Serverless Application Deployment and Management blog post.

I kept finding myself executing shell to use the CLI to execute those commands in a non-elegant manner in my gradle scripts and was motivated to create this plugin.

This plugin has 2 tasks packageSam and deploySam described below that closely mirror the AWS CLI Commands.

Tasks

packageSam

This task uses the tokenArtifactMap, region, s3Bucket, s3Prefix, kmsKeyId, forceUploads extension properties to upload artifacts defined in the map to s3.

If you supply a KMS CMK id via the kmsKeyId property the uploads will be configured to be encrypted with your KMS key. If you do not supply a KMS CMK id the task will configure your uploads to use the server side AES256 encryption.

This task uses MD5 hashes to name your files, so that it can detect if no changes have been made since the last upload and skip re-uploading files that have not changed. You can use forceUploads = true to always force fresh uploads.

Once uploads are complete this tasks copies your SAM Template that you defined in samTemplatePath to the build dir in the sam folders and uses ant to replace the tokens you defined in the map with the S3 URIs so that when you deploy the template CloudFormation will know where your artifacts are in S3.

deploySam

This task uses the template outputted by the packageSam task and CloudFormation to create a change set to either create or update your stack using the stackName property you configured.

This task will ask CloudFormation to validate your template and get all the parameters that the template requires. The plugin then iterates over the template parameters and either uses your overrides defined in parameterOverrides or tells CloudFormation to use the previous value.

Usage

To use the plugin, include it as a dependency in your buildscript section of build.gradle:

Latest release: https://github.com/fieldju/gradle-aws-sam-deployer-plugin/releases/latest

Build script snippet for use in all Gradle versions:

buildscript {
  repositories {
    maven {
      url "https://plugins.gradle.org/m2/"
    }
  }
  dependencies {
    classpath "gradle.plugin.com.fieldju:gradle-aws-sam-deployer-plugin:[VERSION]"
  }
}

apply plugin: "com.fieldju.aws-sam-deployer"

Build script snippet for new, incubating, plugin mechanism introduced in Gradle 2.1:

plugins {
  id "com.fieldju.aws-sam-deployer" version "[VERSION]"
}

Configure the extension properties in the aws-sam-deployer closure:

Property name	Type	Required	Description
region	String	Yes	The region to upload the fatJar / lambda code artifact, and execute the cloud formation in
s3Bucket	String	No	The S3 Bucket to store the fatJar / lambda code artifact
s3prefix	String	No	The prefix in the bucket to use when storing the fatJar / lambda code artifact
kmsKeyId	String	No	The kms cmk id to use to encrypt the fatJar / lambda code artifact when uploading to S3, if not supplied server side AES256 will be used
samTemplatePath	String	Yes	The file path to the SAM Yaml or JSON where you have defined your serverless application model
stackName	String	Yes	The stack name to use for the Cloud Formation stack
parameterOverrides	Map<String, String>	No	A map of Parameters and there values to supply the Cloud Formation template
tokenArtifactMap	Map<String, String>	No	A map of ant style tokens ex: @@FAT_JAR_URI@@ to file paths ex: ${project.buildDir.absolutePath}${File.seperator}libs${File.seperator}my-lambda-project-fat-jar.jar, the package command uses this map to upload the files to s3 and replaces the tokens in the sam template with the S3 URIs
forceUploads	boolean	No	By default if this is left off or set to false, to package command uses m5 hashes to skip files that have not changed since the last deploy. Set this to true to force re-uploading
logStackOutputs	boolean	No	If set to true logs stack outputs after template execution.

Example

Below is an example that supports using profiles to have env specific configuration

plugins {
  id "com.fieldju.aws-sam-deployer" version "[VERSION]"
}

apply plugin: "com.fieldju.aws-sam-deployer"

// load environment specific props from env profiles
def environment = project.hasProperty('environment') ? project.'environment' : 'default'
Properties props = new Properties()
props.load(new FileInputStream("$project.rootDir/profile/"+"$environment"+".properties"))
props.each { prop ->
    project.ext.set(prop.key, prop.value)
}

'aws-sam-deployer' {
    region = project.region
    s3Bucket = project.s3Bucket
    s3Prefix = "${project.getName()}-artifact-uploads"
    stackName = "${project.environment}-jvm-lambda-template"
    samTemplatePath = "${project.rootDir.absolutePath}${File.separator}application.yaml"
    tokenArtifactMap = [
            '@@CODE_URI@@': "${project.buildDir.absolutePath}${File.separator}libs${File.separator}jvm-lambda-template.jar"
    ]
}

Now you can execute the deploySam command ./gradlew clean shadowJar deploySam -Penvironment=development --stacktrace

Quick Start

You can clone my jvm lambda template project that has hello world for Java, Scala and Groovy and is pre-configured with this plugin to be up and running with a new SAM JVM Serverless Application.

Maintainer

Justin Field | @fieldju | fieldju@gmail.com | fieldju.com

License

The Gradle Lambda Sam Plugin is released under the Apache License, Version 2.0