How do I manage API versions and stagings with AWS API Gateway?

To implement API versioning and staging with AWS API Gateway using Pulumi, we will create a few key resources:

1. API Gateway: This is the main resource where our API will be defined.
2. API Gateway Deployment: This resource represents a specific version of the API that can be deployed to a stage.
3. API Gateway Stage: This resource represents a stage (like dev, test, prod) where a specific deployment of the API will be accessible.

Let’s go through the steps to create these resources.

Steps:

1. Create an API Gateway Rest API.
2. Create a Deployment for the API.
3. Create multiple Stages for different environments.

Below is the Pulumi program written in TypeScript that accomplishes this:

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

// Create an API Gateway Rest API
const api = new aws.apigateway.RestApi("myApi", {
    description: "My API for versioning and staging",
});

// Create a deployment for the API
const deployment = new aws.apigateway.Deployment("myApiDeployment", {
    restApi: api.id,
    description: "Deployment for version 1.0.0",
    stageName: "v1",
});

// Create a stage for development
const devStage = new aws.apigateway.Stage("devStage", {
    restApi: api.id,
    deployment: deployment.id,
    stageName: "dev",
    description: "Development stage",
    variables: {
        lambdaAlias: "dev",
    },
});

// Create a stage for testing
const testStage = new aws.apigateway.Stage("testStage", {
    restApi: api.id,
    deployment: deployment.id,
    stageName: "test",
    description: "Testing stage",
    variables: {
        lambdaAlias: "test",
    },
});

// Create a stage for production
const prodStage = new aws.apigateway.Stage("prodStage", {
    restApi: api.id,
    deployment: deployment.id,
    stageName: "prod",
    description: "Production stage",
    variables: {
        lambdaAlias: "prod",
    },
});

// Export the URLs of the stages
export const devStageUrl = pulumi.interpolate`${devStage.invokeUrl}`;
export const testStageUrl = pulumi.interpolate`${testStage.invokeUrl}`;
export const prodStageUrl = pulumi.interpolate`${prodStage.invokeUrl}`;

Explanation:

1. Create an API Gateway Rest API:

   • We create a new API Gateway Rest API using aws.apigateway.RestApi.
   • This will serve as the main API where all versions and stages will be managed.

2. Create a Deployment for the API:

   • We create a deployment using aws.apigateway.Deployment.
   • This deployment represents a specific version of the API (in this case, version 1.0.0).
   • The stageName is set to v1 to represent version 1.0.0.

3. Create multiple Stages for different environments:

   • We create three stages (dev, test, prod) using aws.apigateway.Stage.
   • Each stage is associated with the same deployment but can have different settings and variables.
   • The variables property is used to set stage-specific variables, such as the lambdaAlias which could point to different versions of a Lambda function.

4. Export the URLs of the stages:

   • We export the URLs of the different stages so that they can be accessed and tested.

This setup allows you to manage different versions of your API and deploy them to different stages (environments) with specific configurations.