How do I build serverless applications by provisioning AWS Lambda functions?

In this guide, we will build a serverless application by provisioning an AWS Lambda function using Pulumi. AWS Lambda is a compute service that lets you run code without provisioning or managing servers. We will use Pulumi to define and deploy our infrastructure as code.

Key Points

• AWS Lambda: A serverless compute service that runs your code in response to events and automatically manages the compute resources for you.
• Pulumi: An infrastructure as code tool that allows you to define and deploy cloud resources using programming languages.

Steps

1. Set up Pulumi and AWS credentials: Ensure that Pulumi is installed and AWS credentials are configured.
2. Define the Lambda function: Use Pulumi to define an AWS Lambda function.
3. Deploy the function: Use Pulumi to deploy the Lambda function to AWS.

Code Explanation

The following TypeScript code defines and deploys an AWS Lambda function using Pulumi. The Lambda function will be triggered by an API Gateway HTTP request.

import * as aws from "@pulumi/aws-native";

// Define the Lambda function
const lambdaFunction = new aws.lambda.Function("myLambdaFunction", {
    code: {
        s3Bucket: "my-bucket",  // Replace with your S3 bucket name
        s3Key: "my-function.zip",  // Replace with your S3 object key
    },
    handler: "index.handler",  // The handler function in the code
    role: "arn:aws:iam::123456789012:role/execution_role",  // Replace with your IAM role ARN
    runtime: "nodejs14.x",  // The runtime environment
    memorySize: 128,  // Memory size in MB
    timeout: 5,  // Timeout in seconds
});

// Export the Lambda function name
export const functionName = lambdaFunction.functionName;

Summary

In this guide, we have defined and deployed an AWS Lambda function using Pulumi. We used Pulumi’s aws-native package to define the Lambda function, specifying its code location, handler, IAM role, runtime, memory size, and timeout. Finally, we deployed the function to AWS.

By following these steps, you can build and deploy serverless applications with AWS Lambda using Pulumi.