VitorUssami / studies-aws-servless-chat-app

[Studies][AWS] Servless Chat App

[Studies][AWS] Servless Chat App

This project represents hands on study, based on the course 'Build a Serverless App' with AWS Lambda' by Sundog Education.

Summary

Hands-on using AWS servless services

The main goal of this project is to get some hands on experience on AWS.

This is a chat app where users can login/signup and open conversation with another users. The solution is based on AWS servless services.

Project Overview

What I've learned

Amazon S3

• Create bucket and apply permissions to it.
• Upload and modify bucket's objects.

AWS Lambda

• Create Lambda functions
  • using javascript
• Attach a role to functions
• Create custom tests to validate the lamda function
• Create alias to functions
  • using alias approach you can 'decouple' some specific version while you're configuring the lambda on API gateway.
• Create versions to functions
  • versions are important to not affect your stable production stage while you're modifying and validating some logic.
• Lambda triggers

AWS Identity and Access Management (IAM)

• Create custom policies and roles
• Policies and roles are super important to ensure a secure access to AWS resources.
• Apply roles to AWS resources,

Amazon API Gateway

• Work using proxy mode
• Work using mapping mode
• Resources and methods
• Models
  • attach models to methods executions
• Deploy using Stages
  • create and use stages variables to decouple api gateway from client/implementation
• Request flow
  • (client) -> method request -> integration request -> (logic tier)
  • method request:
    • It's where you can authorize, validate, cache
    • input: request path variables, query string params, request headers, request body
  • integration request:
    • receive incoming request and send it to destination
    • you can passthrough, remap
• Response flow:
  • (client) <- method response <- integration response <- (logic tier)
  • method response: response definitions
  • integration response: response mapping, status code mapping
• Export client (sdk generation)
• Export documentation (Swagger/OpenAPI)

Amazon Cognito

• Create and configure 'user pools'
• Integrate cognito with API Gateway using 'Authorization' header

Amazon DynamoDB

• Create table, indexes
• Create, read, update, delete itens to tables

Amazon CloudFront

• How to use CloudFront to exposes S3 objects more efficiently across the globe
• Config cache time to live (TTL)
• Invalidate cache/object

Amazon CloudWatch

• How to use CloudWatch to monitor metrics, alarms and logs.

Possible improvements

• Use a custom domain and Amazon Route 53.
• Config API Gateway to use custom domain