Production-ready Serverless — AWS API Gateway

Photo by Lenstravelier on Unsplash

This is Part 5 of the production-ready serverless series.

Posts in the series:

1. Getting Started
2. Application Architecture
3. Infrastructure Automation — DynamoDB
4. Infrastructure Automation — AWS S3

Architecture Recap

Based on the previous blog Post we have automated creating DynamoDB and S3. In this Blog Post, we will discuss automating API Gateway and creating an API to add a todo.

Let us start by creating a simple stack that creates the API Gateway layer with the connection to the Lambda system and provide permission to Lambda to access DynamoDB.

API Gateway Stack

We still start with the code and walk through the line-by-line explanation.

We are doing a couple of things here and worth mentioning

1. API stack expects the DynamoDB table resource to be passed in. We’ll be passing in the DynamoDB table that we created previously.
2. We are using SST API constructs to create an AWS API gateway
3. We are passing in the name of our DynamoDB table as an environment variable called TABLE_NAME. We’ll need this to query our table.
4. In the next line, we are setting up the route for Todo Application with standard HTTP Verbs.
5. We are attaching the permission for the lambda to connect to the table. This attaches the IAM role which can provide permission to CRUD operation.
6. Finally, we are printing the API endpoint for our reference.

Adding the stack to the index.js:

And replace the function in index.js with the following lines of code:

Here you’ll notice that we using the public reference of the table from the StorageStack and passing it into our ApiStack

In the next blog post, we will add the business logic for our APIs. You can refer to the complete code from GitHub.

GitHub - satish860/todoapplication: Application Built for Production-Ready Application Series.

Thank you for reading.

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