fix: NodeJS sample

Author: maxday

nodejs/sample-apps/aws-sdk/.eslintignore

@@ -0,0 +1,2 @@
+cdk.out
+build

nodejs/sample-apps/aws-sdk/.eslintrc.js

@@ -1,15 +1,56 @@
-# AWS SDK Sample Application
+# 🧪 AWS SDK Sample Application with OpenTelemetry
 
-**This Sample App is a work-in-progress because it depends on the OpenTelemetry public layer. The public layer will not be published
+This sample demonstrates how to use the **AWS SDK** within a Lambda function with **OpenTelemetry (OTel)** capabilities. It performs a simple `STS GetCallerIdentity` call for demonstration purposes and outputs Otel telemetry data to logs.
 
-This sample application demonstrates usage of the AWS SDK. To try it out, make sure the collector and nodejs Lambda
-layers are built.
+Example log output:  
+![Sample Log Output](./sampleLogOutput.png)
 
-In [collector](../../../collector), run `make package`.
-In [nodejs](../../), run `npm install`.
+---
 
-Then, run `terraform init` and `terraform apply`. The lambda function will be initialized and the URL for an API Gateway invoking the Lambda
-will be displayed at the end. Send a request to the URL in a browser or using curl to execute the function. Then,
-navigate to the function's logs [here](https://console.aws.amazon.com/cloudwatch/home?region=us-east-1#logStream:group=%252Faws%252Flambda%252Fhello-nodejs).
-You will see a log stream with an event time corresponding to when you issued the request - open it and you can find
-information about the exported spans in the log stream.
+## 🚀 Deploy Using AWS CDK
+
+Follow these steps to deploy the demo stack via CDK:
+
+1. **Install dependencies**  
+   `npm install`
+
+2. **Bootstrap your AWS environment (if not done already)**  
+   `npx cdk bootstrap`
+
+3. **Deploy the stack**  
+   `npx cdk deploy OtelSampleLambdaStack`
+
+---
+
+## 🛠️ Manual Deployment via AWS Console
+
+If you'd prefer to deploy manually:
+
+1. **Install dependencies**  
+   `npm install`
+
+2. **Build the Lambda function artifact**  
+   `npm run build`
+
+3. **Create a new AWS Lambda function**  
+   - Runtime: Select the latest `nodejs.x`
+
+4. **Upload the artifact**  
+   - File location: `build/function.zip`
+
+5. **Set the following environment variables**
+```
+   OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4318/  
+   OTEL_TRACES_EXPORTER=logging  
+   OTEL_METRICS_EXPORTER=logging  
+   OTEL_LOG_LEVEL=INFO  
+   OTEL_TRACES_SAMPLER=always_on  
+   AWS_LAMBDA_EXEC_WRAPPER=/opt/otel-handler  
+```
+6. **Attach the Node.js instrumentation layer**  
+   - Refer to the latest ARN in the OpenTelemetry Lambda releases, ie:  
+     https://github.com/open-telemetry/opentelemetry-lambda/releases/tag/layer-nodejs%2F0.14.0
+
+7. **Attach the OpenTelemetry Collector layer**  
+   - Refer to the ARN in the release notes, ie:  
+     https://github.com/open-telemetry/opentelemetry-lambda/releases/tag/layer-collector%2F0.15.0

nodejs/sample-apps/aws-sdk/.gitignore

@@ -0,0 +1,6 @@
+#!/usr/bin/env node
+import * as cdk from 'aws-cdk-lib';
+import { OtelSampleLambdaStack } from '../lib/otel-sample-lambda-stack';
+
+const app = new cdk.App();
+new OtelSampleLambdaStack(app, 'OtelSampleLambdaStack');

nodejs/sample-apps/aws-sdk/README.md

@@ -0,0 +1,3 @@
+{
+  "app": "npm run build && npx ts-node bin/app.ts"
+}

nodejs/sample-apps/aws-sdk/bin/app.ts

@@ -0,0 +1,39 @@
+import {
+  APIGatewayProxyEvent,
+  APIGatewayProxyResult,
+  Context,
+} from 'aws-lambda';
+
+import { STSClient, GetCallerIdentityCommand } from '@aws-sdk/client-sts';
+
+const sts = new STSClient({});
+
+export const handler = async (
+  _event: APIGatewayProxyEvent,
+  _context: Context
+): Promise<APIGatewayProxyResult> => {
+  console.info('Serving lambda request.');
+
+  try {
+    const result = await sts.send(new GetCallerIdentityCommand({}));
+
+    const response: APIGatewayProxyResult = {
+      statusCode: 200,
+      body: JSON.stringify({
+        message: 'Caller identity retrieved successfully',
+        identity: {
+          Account: result.Account,
+          Arn: result.Arn,
+          UserId: result.UserId,
+        },
+      }),
+    };
+    return response;
+  } catch (error) {
+    console.error('Error retrieving caller identity:', error);
+    return {
+      statusCode: 500,
+      body: 'Internal Server Error',
+    };
+  }
+};