Mastering AWS Kinesis Data Streams

Hello and welcome! Here you can find all the code from O'Reilly's 'Mastering AWS Kinesis Data Streams' online training course.

The AWS infrastructure is created and managed by AWS CDK. The application code is in TypeScript.

Prerequisites

• Node.js 14.x
• npm
• TypeScript 2.7 or later (npm -g install typescript)
• AWS CLI
  • Configure AWS account credentials and region (aws configure)
• AWS CDK (npm install -g aws-cdk)
  • Bootstrap CDK resourses (cdk bootstrap aws://ACCOUNT-NUMBER/REGION)

Useful CDK commands

• npm install install project dependencies
• npm run build compile typescript to js
• npm run watch watch for changes and compile
• npm run test perform the jest unit tests
• cdk deploy deploy this stack to your default AWS account/region
• cdk diff compare deployed stack with current state
• cdk synth emits the synthesized CloudFormation template

Lambda functions

The two lambda functions that act as a Kinesis producer and a Kinesis consumer are in the lambdas directory. The lambda code itself is Node.js.

Lambda Tests

For the demonstration purposes, there are several Mocha tests written for the producer Lambda. They use Nock to mock the Kinesis HTTP responses.

To run individual test files, from the producer directory run

  npm i
  npm t test/<test_file_name>

You can also run all the tests at once:

  npm it

Deploying lambdas

From the corresponding lambda directories, run

  npm i --production

After that, the actual deployment is handled by the CDK, along with the rest of the AWS resources (cdk deploy from the root directory).