How to Integrate Pulumi with OpenAPI Spec for AWS API Gateway and Lambda Without Redundant Endpoint Declarations?

Are you tired of dealing with redundant endpoint declarations when integrating Pulumi with OpenAPI spec for AWS API Gateway and Lambda? You’re not alone! In this comprehensive guide, we’ll show you how to simplify your infrastructure-as-code (IaC) experience by leveraging Pulumi’s OpenAPI integration and AWS API Gateway/Lambda features.

What is Pulumi?

Pulumi is an open-source infrastructure-as-code (IaC) platform that allows you to define and manage cloud infrastructure using programming languages like TypeScript, Python, Go, and C#. It provides a unified way to manage infrastructure across multiple cloud providers, including AWS, Azure, Google Cloud, and more.

What is OpenAPI Spec?

OpenAPI Specification (OAS) is an industry-standard API description format that allows developers to define, document, and visualize RESTful APIs. It provides a machine-readable definition of an API, making it possible to generate client code, documentation, and even deploy APIs on various platforms, including AWS API Gateway.

Why Integrate Pulumi with OpenAPI Spec?

Integrating Pulumi with OpenAPI spec offers several benefits, including:

• Streamlined API development: With Pulumi, you can define your API infrastructure using OpenAPI spec, eliminating the need for redundant endpoint declarations.
• Version control: Pulumi’s integration with OpenAPI spec enables you to manage your API infrastructure as code, making it easier to track changes and collaborate with team members.
• Consistency: By using OpenAPI spec, you can ensure consistency across your API documentation, client code, and infrastructure.

Prerequisites

Before we dive into the integration process, make sure you have the following prerequisites in place:

• Pulumi installed on your machine (CLI or SDK)
• An AWS account with API Gateway and Lambda enabled
• OpenAPI spec file (in YAML or JSON format)

Step-by-Step Integration Guide

Now, let’s walk through the step-by-step process of integrating Pulumi with OpenAPI spec for AWS API Gateway and Lambda:

Step 1: Create an OpenAPI Spec File

Create a new file named `openapi.yaml` (or `openapi.json`) and add the following content:

openapi: 3.0.2
info:
  title: My API
  description: My API description
  version: 1.0.0
paths:
  /hello:
    get:
      summary: Hello World
      responses:
        200:
          description: Hello World response
          content:
            application/json:
              schema:
                type: string

This OpenAPI spec defines a simple API with a single endpoint `/hello` that returns a “Hello World” response.

Step 2: Create a Pulumi Project

Create a new Pulumi project using the CLI or SDK:

 pulumi new aws-typescript --name pulumi-openapi-integration

This will create a new Pulumi project with the required files and dependencies.

Step 3: Install Required Dependencies

Install the required dependencies, including the Pulumi AWS provider and OpenAPI plugin:

npm install @pulumi/aws @pulumi/openapi

Step 4: Define the API Gateway and Lambda Resources

In your Pulumi project, create a new file named `index.ts` (or `index.py`, `index.go`, etc. depending on your language of choice) and add the following code:

import * as pulumi from "@pulumi/pulumi";
import * as aws from "@pulumi/aws";
import * as openapi from "@pulumi/openapi";

// Create an AWS provider
const provider = new aws.Provider("aws", {
  region: "us-west-2",
});

// Create an API Gateway
const api = new aws.apigateway.RestApi("my-api", {
  name: "My API",
  description: "My API description",
});

// Create a Lambda function
const lambda = new aws.lambda.Function("my-lambda", {
  runtime: "nodejs14.x",
  handler: "index.handler",
  code: pulumi.assetArchive({
    "index.js": pulumi.stringAsset(`
      exports.handler = async () => {
        return { statusCode: 200, body: JSON.stringify({ message: "Hello World!" }) };
      };
    `),
  }),
});

// Create an OpenAPI spec
const openapiSpec = new openapi.Spec("openapi", {
  filePath: "openapi.yaml",
});

// Create an API Gateway deployment
const deployment = new aws.apigateway.Deployment("my-deployment", {
  restApi: api,
  stageName: "dev",
});

// Create an API Gateway integration with Lambda
const integration = new aws.apigateway.Integration("my-integration", {
  restApi: api,
  resourcePath: "/hello",
  httpMethod: "GET",
  integrationHttpMethod: "POST",
  type: "LAMBDA",
  uri: pulumi.interpolate`arn:aws:apigateway:${provider.region}:lambda:path/2015-03-31/functions/${lambda.arn}/invocations`,
});

This code defines an AWS provider, API Gateway, Lambda function, OpenAPI spec, API Gateway deployment, and an API Gateway integration with the Lambda function.

Step 5: Deploy the Infrastructure

Run the following command to deploy the infrastructure:

pulumi up

This will deploy the API Gateway, Lambda function, and OpenAPI spec to your AWS account.

Step 6: Verify the Integration

Use a tool like `curl` to verify that the API is working as expected:

curl https://<api-id>.execute-api.<region>.amazonaws.com/dev/hello

This should return a “Hello World!” response.

Benefits of the Integration

By integrating Pulumi with OpenAPI spec, you’ve achieved the following benefits:

• No redundant endpoint declarations: Pulumi uses the OpenAPI spec to generate the API Gateway endpoints, eliminating the need for manual declarations.
• Version control: Your API infrastructure is now managed as code, making it easier to track changes and collaborate with team members.
• Consistency: The OpenAPI spec ensures consistency across your API documentation, client code, and infrastructure.

Conclusion

In this article, we’ve demonstrated how to integrate Pulumi with OpenAPI spec for AWS API Gateway and Lambda without redundant endpoint declarations. By following these steps, you can simplify your IaC experience and leverage the benefits of Pulumi’s OpenAPI integration.

Remember to explore Pulumi’s extensive documentation and community resources for more advanced use cases and best practices.

Resource	Link
Pulumi Documentation	https://www.pulumi.com/docs/
OpenAPI Specification	https://swagger.io/specification/
Pulumi OpenAPI Plugin	https://github.com/pulumi/pulumi-openapi

Happy coding, and don’t forget to share your Pulumi OpenAPI integration experiences with the community!

Frequently Asked Question

Get ready to uncover the secrets of integrating Pulumi with OpenAPI Spec for AWS API Gateway and Lambda without redundant endpoint declarations!