Infrastucture as Code (CDK)

Let’s create the code required to deploy our initial Lambda function. Firstly you’ll need to install the AWS Cloud Development Kit (CDK)

Now initialize a new CDK project called app.

cd infrastructure
cdk init app --language java

The initial project will look like this.

├── README.md
├── cdk.json
├── pom.xml
└── src
    ├── main
    │   └── java
    │       └── com
    │           └── myorg
    │               ├── InfrastructureApp.java
    │               └── InfrastructureStack.java
    └── test
        └── java
            └── com
                └── myorg
                    └── InfrastructureTest.java

We’ll rename the packages and add a Lambda function and API Gateway (HTTP API) to InfrastructureStack.java.

InfrastructureStack.java

package com.graalvmonlambda.infra;

import software.amazon.awscdk.core.*;
import software.amazon.awscdk.services.apigatewayv2.*;
import software.amazon.awscdk.services.apigatewayv2.integrations.LambdaProxyIntegration;
import software.amazon.awscdk.services.apigatewayv2.integrations.LambdaProxyIntegrationProps;
import software.amazon.awscdk.services.lambda.Code;
import software.amazon.awscdk.services.lambda.Function;
import software.amazon.awscdk.services.lambda.FunctionProps;
import software.amazon.awscdk.services.lambda.Runtime;
import software.amazon.awscdk.services.logs.RetentionDays;

import static java.util.Collections.singletonList;

public class InfrastructureStack extends Stack {
    public InfrastructureStack(final Construct scope, final String id) {
        this(scope, id, null);
    }

    public InfrastructureStack(final Construct scope, final String id, final StackProps props) {
        super(scope, id, props);

        Function productFunction = new Function(this, "ProductFunction", FunctionProps.builder()
                .runtime(Runtime.JAVA_11)
                .code(Code.fromAsset("../software/products/target/product.jar"))
                .handler("com.graalvmonlambda.product.ProductRequestHandler")
                .memorySize(1024)
                .logRetention(RetentionDays.ONE_WEEK)
                .build());

        HttpApi httpApi = new HttpApi(this, "GraalVMOnLambdaAPI", HttpApiProps.builder()
                .apiName("GraalVMonLambdaAPI")
                .build());

        httpApi.addRoutes(AddRoutesOptions.builder()
                .path("/product")
                .methods(singletonList(HttpMethod.GET))
                .integration(new LambdaProxyIntegration(LambdaProxyIntegrationProps.builder()
                        .handler(productFunction)
                        .payloadFormatVersion(PayloadFormatVersion.VERSION_2_0)
                        .build()))
                .build());

        CfnOutput apiUrl = new CfnOutput(this, "ProductApiUrl", CfnOutputProps.builder()
                .exportName("ProductApiUrl")
                .value(httpApi.getApiEndpoint())
                .build());
    }
}

This will require a couple of extra CDK dependencies in your pom.xml.

<dependency>
    <groupId>software.amazon.awscdk</groupId>
    <artifactId>lambda</artifactId>
    <version>${cdk.version}</version>
</dependency>
<dependency>
    <groupId>software.amazon.awscdk</groupId>
    <artifactId>apigatewayv2</artifactId>
    <version>${cdk.version}</version>
</dependency>
<dependency>
    <groupId>software.amazon.awscdk</groupId>
    <artifactId>apigatewayv2-integrations</artifactId>
    <version>${cdk.version}</version>
</dependency>

If you’re new to CDK you’ll need to run cdk bootstrap before you deploy anything.

Now you’re ready to deploy

cdk deploy

You should see your API Gateway endpoint in the outputs.

Outputs:
InfrastructureStack.ProductApiUrl = https://xxxxxxxxxx.execute-api.eu-west-1.amazonaws.com

We can curl the output url to validate everything is ok.

curl -v https://xxxxxxxxxx.execute-api.eu-west-1.amazonaws.com/product