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Learn by example! Using serverless and managed components on AWS, you can build powerful and scalable solutions without worrying about provisioning servers. Focus on your logic while AWS handles the infrastructure.
In this example, a ticketing system is built using:
– Lambda Authorizers with API Gateway to validate requests.
– AWS CDK (Cloud Development Kit) for Infrastructure as Code (IaC), allowing developers to use their preferred programming language.
Check out the full example by Yaroslav Muravskyi:
Building a Serverless Customer Support Ticket Routing Service
You Should Know:
1. AWS Lambda Authorizer Setup
A Lambda Authorizer validates API Gateway requests using custom logic. Here’s a basic Python example:
import json
def lambda_handler(event, context):
token = event['authorizationToken']
if token == 'SECURE_TOKEN':
return {
'principalId': 'user123',
'policyDocument': {
'Version': '2012-10-17',
'Statement': [{
'Action': 'execute-api:Invoke',
'Effect': 'Allow',
'Resource': event['methodArn']
}]
}
}
else:
raise Exception('Unauthorized')
2. Deploying with AWS CDK
Install AWS CDK and bootstrap your environment:
npm install -g aws-cdk cdk bootstrap aws://ACCOUNT-NUMBER/REGION
Define a Lambda-backed API Gateway in Python:
from aws_cdk import (
core,
aws_lambda as lambda_,
aws_apigateway as apigw
)
class TicketSystemStack(core.Stack):
def <strong>init</strong>(self, scope: core.Construct, id: str, kwargs) -> None:
super().<strong>init</strong>(scope, id, kwargs)
Lambda function
handler = lambda_.Function(
self, "TicketHandler",
runtime=lambda_.Runtime.PYTHON_3_8,
code=lambda_.Code.from_asset("lambda"),
handler="ticket.handler"
)
API Gateway
api = apigw.RestApi(self, "TicketAPI")
tickets = api.root.add_resource("tickets")
tickets.add_method("POST", apigw.LambdaIntegration(handler))
3. Key AWS CLI Commands
- Test Lambda Locally:
aws lambda invoke --function-name TicketHandler --payload file://input.json output.json
- Update CDK Stack:
cdk deploy
- Check API Gateway Logs:
aws apigateway get-rest-apis aws apigateway get-stages --rest-api-id YOUR_API_ID
What Undercode Say
Serverless architectures reduce operational overhead while enabling rapid scaling. By leveraging AWS Lambda, API Gateway, and CDK, developers can focus on business logic instead of infrastructure. Key takeaways:
– Use Lambda Authorizers for secure API access.
– AWS CDK simplifies IaC with familiar programming languages.
– CLI commands help debug and manage deployments efficiently.
For further learning, explore:
Expected Output:
A fully automated, serverless ticketing system deployed on AWS with secure API access and scalable architecture.
References:
Reported By: Darryl Ruggles – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
