Gradle AWS Plugin

For Gradle projects, deployment can be made even more straightforward using the Gradle AWS Plugin. This plugin provides a deploy task which can push your function to AWS Lambda directly, as well as a AWSLambdaInvokeTask which can be used to invoke your function when it is deployed.

Example build.gradle

import com.amazonaws.services.lambda.model.InvocationType
import jp.classmethod.aws.gradle.lambda.AWSLambdaInvokeTask
import jp.classmethod.aws.gradle.lambda.AWSLambdaMigrateFunctionTask
import com.amazonaws.services.lambda.model.Runtime
buildscript {
    repositories {
        ...
        maven { url "https://plugins.gradle.org/m2/" } (1)
    }
    dependencies {
        classpath "jp.classmethod.aws:gradle-aws-plugin:0.22"
    }
}
apply plugin: 'jp.classmethod.aws.lambda' (2)
...
task deploy(type: AWSLambdaMigrateFunctionTask, dependsOn: shadowJar) {
    functionName = "hello-world"
    handler = "example.HelloWorldFunction::hello"
    role = "arn:aws:iam::${aws.accountId}:role/lambda_basic_execution" (3)
    runtime = Runtime.Java8
    zipFile = shadowJar.archivePath
    memorySize = 256
    timeout = 60
}
task invoke(type: AWSLambdaInvokeTask) {
    functionName = "hello-world"
    invocationType = InvocationType.RequestResponse
    payload = '{"name":"Fred"}'
    doLast {
        println "Lambda function result: " + new String(invokeResult.payload.array(), "UTF-8")
    }
}

Note that the value of the handler property of the deploy task should be either:

• In this case of Java or Kotlin: io.micronaut.function.aws.MicronautRequestStreamHandler

• In the case of Groovy function definitions: A reference to the function (in the above case example.HelloWorldFunction::hello)

The reason for this is the function-groovy dependency applies additional code transformations to make it possible to reference the function directly.

With the above build configuration, the function can be deployed to AWS Lambda using the deploy task.

$ ./gradlew deploy

The deployed function can then be invoked.

$ ./gradlew invoke
Hello, Fred

Consult the Gradle AWS plugin documentation for more details on the use of the plugin.