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APIGW + Lambda sample app (#961)
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‎sample-apps/apigateway-lambda/README.md

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## API Gateway + Lambda Sample Application
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The directory contains the source code and the Infrastructure as Code (IaC) to create the sample app in your AWS account.
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### Prerequisite
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Before you begin, ensure you have the following installed:
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- Java 17
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- Gradle
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- Terraform
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- AWS CLI configured with appropriate credentials
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### Getting Started
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#### 1. Build the application
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```bash
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# Change to the project directory
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cd sample-apps/apigateway-lambda
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# Build the application using Gradle
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gradle clean build
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# Prepare the Lambda deployment package
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gradle createLambdaZip
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```
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#### 2. Deploy the application
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```bash
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# Change to the terraform directory
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cd terraform
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# Initialize Terraform
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terraform init
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# (Optional) Review the deployment plan for better understanding of the components
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terraform plan
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# Deploy
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terraform apply
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```
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#### 3. Testing the applicating
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After successful deployment, Terraform will output the API Gateway endpoint URL. You can test the application using:
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```bash
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curl <API_Gateway_URL>
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```
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#### 4. Clean Up
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To avoid incurring unnecessary charges, remember to destroy the resources when you are done:
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```bash
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terraform destroy
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```
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#### (Optional) Instrumenting with Application Signals Lambda Layer
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You can choose to instrument the Lambda function with Application Signals Lambda Layer upon deployment by passing in the layer ARN to the `adot_layer_arn` variable.
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You must have the layer already published to your account before executing the following command.
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```bash
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terraform apply -var "adot_layer_arn=<APPLICATION_SIGNALS_LAYER_FULL_ARN_WITH_VERSION>"
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```

‎sample-apps/apigateway-lambda/build.gradle.kts

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plugins {
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java
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application
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}
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application {
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mainClass.set("com.amazon.sampleapp.LambdaHandler")
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}
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java {
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toolchain {
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languageVersion.set(JavaLanguageVersion.of(17))
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}
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}
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dependencies {
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implementation("com.amazonaws:aws-lambda-java-core:1.2.2")
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implementation("com.squareup.okhttp3:okhttp:4.11.0")
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implementation("software.amazon.awssdk:s3:2.29.23")
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implementation("org.json:json:20240303")
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implementation("org.slf4j:jcl-over-slf4j:2.0.16")
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testImplementation("org.junit.jupiter:junit-jupiter:5.10.0")
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}
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tasks.jar {
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manifest {
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attributes["Main-Class"] = "com.amazon.sampleapp.LambdaHandler"
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}
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}
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tasks.register<Zip>("createLambdaZip") {
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dependsOn("build")
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from(tasks.compileJava.get())
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from(tasks.processResources.get())
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into("lib") {
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from(configurations.runtimeClasspath.get())
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}
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archiveFileName.set("lambda-function.zip")
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destinationDirectory.set(layout.buildDirectory.dir("distributions"))
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}

‎sample-apps/apigateway-lambda/src/main/java/com/amazon/sampleapp/LambdaHandler.java

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package com.amazon.sampleapp;
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import com.amazonaws.services.lambda.runtime.Context;
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import com.amazonaws.services.lambda.runtime.RequestHandler;
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import java.io.IOException;
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import java.util.Map;
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import okhttp3.OkHttpClient;
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import okhttp3.Request;
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import okhttp3.Response;
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import org.json.JSONObject;
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import software.amazon.awssdk.services.s3.S3Client;
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import software.amazon.awssdk.services.s3.model.HeadBucketRequest;
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import software.amazon.awssdk.services.s3.model.S3Exception;
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public class LambdaHandler implements RequestHandler<Object, Map<String, Object>> {
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private final OkHttpClient client = new OkHttpClient();
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private final S3Client s3Client = S3Client.create();
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@Override
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public Map<String, Object> handleRequest(Object input, Context context) {
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System.out.println("Executing LambdaHandler");
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// https://docs.aws.amazon.com/lambda/latest/dg/configuration-envvars.html#configuration-envvars-runtime
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// try and get the trace id from environment variable _X_AMZN_TRACE_ID. If it's not present
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// there
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// then try the system property.
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String traceId =
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System.getenv("_X_AMZN_TRACE_ID") != null
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? System.getenv("_X_AMZN_TRACE_ID")
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: System.getProperty("com.amazonaws.xray.traceHeader");
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System.out.println("Trace ID: " + traceId);
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JSONObject responseBody = new JSONObject();
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responseBody.put("traceId", traceId);
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// Make a remote call using OkHttp
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System.out.println("Making a remote call using OkHttp");
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String url = "https://www.amazon.com";
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Request request = new Request.Builder().url(url).build();
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try (Response response = client.newCall(request).execute()) {
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responseBody.put("httpRequest", "Request successful");
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} catch (IOException e) {
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context.getLogger().log("Error: " + e.getMessage());
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responseBody.put("httpRequest", "Request failed");
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}
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System.out.println("Remote call done");
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// Make a S3 HeadBucket call to check whether the bucket exists
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System.out.println("Making a S3 HeadBucket call");
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String bucketName = "SomeDummyBucket";
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try {
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HeadBucketRequest headBucketRequest = HeadBucketRequest.builder().bucket(bucketName).build();
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s3Client.headBucket(headBucketRequest);
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responseBody.put("s3Request", "Bucket exists and is accessible: " + bucketName);
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} catch (S3Exception e) {
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if (e.statusCode() == 403) {
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responseBody.put("s3Request", "Access denied to bucket: " + bucketName);
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} else if (e.statusCode() == 404) {
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responseBody.put("s3Request", "Bucket does not exist: " + bucketName);
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} else {
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System.err.println("Error checking bucket: " + e.awsErrorDetails().errorMessage());
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responseBody.put(
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"s3Request", "Error checking bucket: " + e.awsErrorDetails().errorMessage());
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}
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}
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System.out.println("S3 HeadBucket call done");
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// return a response in the ApiGateway proxy format
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return Map.of(
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"isBase64Encoded",
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false,
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"statusCode",
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200,
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"body",
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responseBody.toString(),
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"headers",
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Map.of("Content-Type", "application/json"));
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}
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}

‎sample-apps/apigateway-lambda/terraform/main.tf

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### Lambda function
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locals {
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architecture = var.architecture == "x86_64" ? "amd64" : "arm64"
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}
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resource "aws_iam_role" "lambda_role" {
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name = "lambda_execution_role"
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assume_role_policy = jsonencode({
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Version = "2012-10-17",
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Statement = [{
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Action = "sts:AssumeRole",
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Effect = "Allow",
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Principal = { Service = "lambda.amazonaws.com" }
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}]
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})
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}
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resource "aws_iam_policy" "s3_access" {
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name = "S3ListBucketPolicy"
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description = "Allow Lambda to check a given S3 bucket exists"
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policy = jsonencode({
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Version = "2012-10-17",
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Statement = [{
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Effect = "Allow",
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Action = ["s3:ListBucket"],
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Resource = "*"
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}]
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})
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}
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resource "aws_iam_role_policy_attachment" "attach_execution_role_policy" {
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role = aws_iam_role.lambda_role.name
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policy_arn = "arn:aws:iam::aws:policy/service-role/AWSLambdaBasicExecutionRole"
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}
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resource "aws_iam_role_policy_attachment" "attach_s3_policy" {
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role = aws_iam_role.lambda_role.name
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policy_arn = aws_iam_policy.s3_access.arn
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}
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resource "aws_iam_role_policy_attachment" "attach_xray_policy" {
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role = aws_iam_role.lambda_role.name
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policy_arn = "arn:aws:iam::aws:policy/AWSXRayDaemonWriteAccess"
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}
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resource "aws_lambda_function" "sampleLambdaFunction" {
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function_name = var.function_name
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runtime = var.runtime
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timeout = 300
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handler = "com.amazon.sampleapp.LambdaHandler::handleRequest"
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role = aws_iam_role.lambda_role.arn
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filename = "${path.module}/../build/distributions/lambda-function.zip"
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source_code_hash = filebase64sha256("${path.module}/../build/distributions/lambda-function.zip")
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architectures = [var.architecture]
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memory_size = 512
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tracing_config {
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mode = var.lambda_tracing_mode
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}
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layers = var.adot_layer_arn != null && var.adot_layer_arn != "" ? [var.adot_layer_arn] : []
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environment {
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variables = var.adot_layer_arn != null && var.adot_layer_arn != "" ? {
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AWS_LAMBDA_EXEC_WRAPPER = "/opt/otel-instrument"
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} : {}
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}
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}
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### API Gateway proxy to Lambda function
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resource "aws_api_gateway_rest_api" "apigw_lambda_api" {
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name = var.api_gateway_name
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}
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resource "aws_api_gateway_resource" "apigw_lambda_resource" {
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rest_api_id = aws_api_gateway_rest_api.apigw_lambda_api.id
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parent_id = aws_api_gateway_rest_api.apigw_lambda_api.root_resource_id
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path_part = "lambda"
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}
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resource "aws_api_gateway_method" "apigw_lambda_method" {
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rest_api_id = aws_api_gateway_rest_api.apigw_lambda_api.id
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resource_id = aws_api_gateway_resource.apigw_lambda_resource.id
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http_method = "ANY"
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authorization = "NONE"
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}
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resource "aws_api_gateway_integration" "apigw_lambda_integration" {
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rest_api_id = aws_api_gateway_rest_api.apigw_lambda_api.id
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resource_id = aws_api_gateway_resource.apigw_lambda_resource.id
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http_method = aws_api_gateway_method.apigw_lambda_method.http_method
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integration_http_method = "POST"
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type = "AWS_PROXY"
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uri = aws_lambda_function.sampleLambdaFunction.invoke_arn
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}
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resource "aws_api_gateway_deployment" "apigw_lambda_deployment" {
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depends_on = [
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aws_api_gateway_integration.apigw_lambda_integration
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]
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rest_api_id = aws_api_gateway_rest_api.apigw_lambda_api.id
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}
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resource "aws_api_gateway_stage" "test" {
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stage_name = "default"
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rest_api_id = aws_api_gateway_rest_api.apigw_lambda_api.id
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deployment_id = aws_api_gateway_deployment.apigw_lambda_deployment.id
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xray_tracing_enabled = var.apigw_tracing_enabled
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}
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resource "aws_lambda_permission" "apigw_lambda_invoke" {
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statement_id = "AllowAPIGatewayInvoke"
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action = "lambda:InvokeFunction"
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function_name = aws_lambda_function.sampleLambdaFunction.function_name
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principal = "apigateway.amazonaws.com"
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source_arn = "${aws_api_gateway_rest_api.apigw_lambda_api.execution_arn}/*/*"
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}
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# Output the API Gateway URL
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output "invoke_url" {
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value = "${aws_api_gateway_stage.test.invoke_url}/lambda"
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}

‎sample-apps/apigateway-lambda/terraform/variables.tf

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## Lambda function related configurations
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variable "function_name" {
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type = string
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description = "Name of sample app function"
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default = "aws-opentelemetry-distro-java"
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}
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variable "architecture" {
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type = string
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description = "Lambda function architecture, either arm64 or x86_64"
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default = "x86_64"
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}
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variable "runtime" {
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type = string
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description = "Java runtime version used for Lambda Function"
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default = "java17"
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}
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variable "lambda_tracing_mode" {
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type = string
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description = "Lambda function tracing mode"
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default = "Active"
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}
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variable "adot_layer_arn" {
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type = string
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description = "ARN of the ADOT JAVA layer"
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default = null
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}
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## API Gateway related configurations
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variable "api_gateway_name" {
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type = string
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description = "Name of API gateway to create"
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default = "aws-opentelemetry-distro-java"
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}
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variable "apigw_tracing_enabled" {
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type = string
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description = "API Gateway REST API tracing enabled or not"
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default = "true"
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}

‎settings.gradle.kts

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include(":sample-apps:springboot")
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include(":sample-apps:spark")
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include(":sample-apps:spark-awssdkv1")
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include(":sample-apps:apigateway-lambda")
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// Used for contract tests
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include("appsignals-tests:images:mock-collector")

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