Simple demo application deployed using LocalStack, developed using the Serverless framework.

The sample app illustrates a typical Web application scenario with asynchronous request processing happening in the background, all running locally inside LocalStack. The figure below outlines the application architecture with the different components and services involved in processing the requests.

• LocalStack
• Docker
• Node.js / npm
• make

Note: Make sure to start LocalStack with the EXTRA_CORS_ALLOWED_ORIGINS=http://localhost:3000 config enabled, to ensure the demo Web application can access the local APIs from the browser.

Install the dependencies using this command:

make install 

Start the application locally in LocalStack:

make start 

After starting the app, open this URL in your browser: http://localhost:3000

• Enable the option "Auto-Refresh" to continuously poll for new results
• Click the button "Create new request" to send a new request to the backend API
• The new request will go through the phases QUEUED->PROCESSING->FINISHED as the request is being handled by the backend services (Lambda functions, Step Functions state machine)

If you have the awslocal command line installed, you can browse the contents of the local S3 bucket via:

awslocal s3 ls s3://archive-bucket/ 

This code is available under the Apache 2.0 license.