How do I create WebSocket APIs for real-time communication on AWS?

In this guide, we will create a WebSocket API for real-time communication using AWS API Gateway with Pulumi. We will define the WebSocket API, create routes, and deploy the API. This setup will allow you to handle real-time communication efficiently.

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

// Create a new WebSocket API
const webSocketApi = new aws.apigatewayv2.Api("webSocketApi", {
    protocolType: "WEBSOCKET",
    routeSelectionExpression: "$request.body.action",
});

// Create a default route
const defaultRoute = new aws.apigatewayv2.Route("defaultRoute", {
    apiId: webSocketApi.id,
    routeKey: "$default",
    target: pulumi.interpolate`integrations/${webSocketApi.id}`,
});

// Create a connect route
const connectRoute = new aws.apigatewayv2.Route("connectRoute", {
    apiId: webSocketApi.id,
    routeKey: "$connect",
    target: pulumi.interpolate`integrations/${webSocketApi.id}`,
});

// Create a disconnect route
const disconnectRoute = new aws.apigatewayv2.Route("disconnectRoute", {
    apiId: webSocketApi.id,
    routeKey: "$disconnect",
    target: pulumi.interpolate`integrations/${webSocketApi.id}`,
});

// Deploy the WebSocket API
const deployment = new aws.apigatewayv2.Deployment("deployment", {
    apiId: webSocketApi.id,
    triggers: {
        redeployment: pulumi.all([defaultRoute.id, connectRoute.id, disconnectRoute.id]).apply(([defaultRouteId, connectRouteId, disconnectRouteId]) => `${defaultRouteId}:${connectRouteId}:${disconnectRouteId}`),
    },
});

// Create a stage for the deployment
const stage = new aws.apigatewayv2.Stage("stage", {
    apiId: webSocketApi.id,
    deploymentId: deployment.id,
    name: "dev",
});

// Export the WebSocket API endpoint
export const webSocketApiEndpoint = webSocketApi.apiEndpoint;

Key Points

WebSocket API: Created using aws.apigatewayv2.Api with protocol type set to WEBSOCKET.
Routes: Defined routes for $default, $connect, and $disconnect to handle incoming messages and connection events.
Deployment: Deployed the API and created a stage to make it accessible.

Summary

In this guide, we created a WebSocket API on AWS using Pulumi. We defined the API, set up routes for handling messages and connection events, deployed the API, and created a stage. This setup allows for real-time communication using WebSocket.

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