Using Aws Apigatewayv2 With Sfn

Introduction

In this guide, we will create an AWS API Gateway v2 (HTTP API) integrated with AWS Step Functions using Pulumi. The key services involved are AWS API Gateway v2 for creating and managing APIs, and AWS Step Functions for orchestrating serverless workflows.

Step-by-Step Explanation

Step 1: Set Up Pulumi Project

1. Initialize a new Pulumi project.
2. Configure AWS credentials.

Step 2: Create AWS Step Function

1. Define the state machine using Amazon States Language (ASL).
2. Create the Step Function using Pulumi’s AWS SDK.

Step 3: Create API Gateway v2

1. Define the API Gateway v2 (HTTP API).
2. Create routes and integrations to connect the API Gateway with the Step Function.

Step 4: Deploy the Infrastructure

1. Deploy the Pulumi stack to create the resources in AWS.
2. Test the API Gateway to ensure it triggers the Step Function correctly.

Conclusion

By following these steps, you have successfully created an AWS API Gateway v2 integrated with AWS Step Functions using Pulumi. This setup allows you to expose your Step Functions as HTTP endpoints, enabling seamless integration with other services and applications.

Full Code Example

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

// Step 2: Create AWS Step Function
const stepFunctionRole = new aws.iam.Role("stepFunctionRole", {
    assumeRolePolicy: {
        Version: "2012-10-17",
        Statement: [{
            Action: "sts:AssumeRole",
            Effect: "Allow",
            Sid: "",
            Principal: {
                Service: "states.amazonaws.com",
            },
        }],
    },
});

const stepFunction = new aws.sfn.StateMachine("stepFunction", {
    roleArn: stepFunctionRole.arn,
    definition: \`{
        "Comment": "A Hello World example of the Amazon States Language using Pass states",
        "StartAt": "HelloWorld",
        "States": {
            "HelloWorld": {
                "Type": "Pass",
                "Result": "Hello, World!",
                "End": true
            }
        }
    }\`,
});

// Step 3: Create API Gateway v2
const api = new aws.apigatewayv2.Api("httpApi", {
    protocolType: "HTTP",
});

const integration = new aws.apigatewayv2.Integration("stepFunctionIntegration", {
    apiId: api.id,
    integrationType: "AWS_PROXY",
    integrationUri: stepFunction.arn,
    credentialsArn: stepFunctionRole.arn,
});

const route = new aws.apigatewayv2.Route("stepFunctionRoute", {
    apiId: api.id,
    routeKey: "ANY /stepfunction",
    target: pulumi.interpolate\`integrations/\${integration.id}\`,
});

// Step 4: Deploy the Infrastructure
const stage = new aws.apigatewayv2.Stage("apiStage", {
    apiId: api.id,
    name: "default",
    autoDeploy: true,
});

export const apiEndpoint = pulumi.interpolate\`\${api.apiEndpoint}/stepfunction\`;