multi-region-with-apigw-lambda-ddb

Exemple of building a Multi-region Serverless Application with Amazon API Gateway, AWS Lambda, DynamoDB Global tables, Route53 health-checks and infrastructure as code (CDK).

This is work in progress and currently assumes the DNS domain is iulianm.dev.

The stack would create ApiGateway+ACM+Lambda in us-east-1 and us-west-2.

Each region would have the following APIGateway custom domains:

• api.iulianm.dev
• api.<region>.iulianm.dev

This guide makes use of SIGV4A which is an extension that enables signatures that are valid in more than one AWS Region.

Welcome to your CDK TypeScript project

This is a blank project for TypeScript development with CDK.

The cdk.json file tells the CDK Toolkit how to execute your app.

Useful commands

• 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

Synthesize synthesized CloudFormation template

cdk synth

Deploy DNS stack

cdk deploy DnsStack

Deploy PDX stack

cdk deploy MultiRegionWithApigwLambdaDdbStack-PDX

Deploy IAD stack

cdk deploy MultiRegionWithApigwLambdaDdbStack-IAD

Client

Got to client directory.

pip install -r requirements.txt

Start ipython:

import requests
from sigv4a_sign import SigV4ASign

service = 'execute-api'
region = '*'
method = 'GET'
url = 'https://api.iulianm.dev'


def make_call():
    headers = SigV4ASign().get_headers_basic(service, region, method, url)
    r = requests.get(url, headers=headers)
    return r

print(f'status_code: {make_call().status_code} \nobject text: {make_call().text}')

Output:

print(f'status_code: {make_call().status_code} \nobject text: {make_call().text}')
status_code: 200
object text: {"Region ": "us-west-2"}

print(f'status_code: {make_call().status_code} \nobject text: {make_call().text}')
status_code: 200
object text: {"Region ": "us-east-1"}