Auth Microservice

Description

Auth microservice for microservices architecture.

Created authorization flow

Added code: https://github.com/ndmen/auth-microservice/tree/main

Added two routes:

• POST /auth/signup - Register user
• POST /auth/signin - Login user

Added 4 e2e tests for two routes:

Added logic saving access_token in redis (used ioredis library) with TTL 24 hours (FOR PERFORMANCE)

If token exist in redis - return from redis If token not exist - sign new token

About scale

What if this service needed to scale to 10,000 user registration requests per second?

My response:

• We can use database sharding
• We can use caching
• We can use asynchronous functions (big tasks as email for example delegate to background jobs or queues)
• We can distribute incoming requests across multiple instances

How about 100,000 user login requests per second?

My response:

• We can use redis for returning access token (caching)
• We can use throttling (ThrottlerModule in nest js)
• We can optimize database queries

How to run application

1. Clone code: https://github.com/ndmen/auth-microservice/tree/main

2. Install packages: yarn install

3. Create file .env.development and copy environments from file .env.example

4. Run in docker container auth, redis and postgres using command: yarn docker:up (If will RECONNECT to redis inside docker container (See auth-microservice logs) - run only auth-microservice just through terminal on local machine)

5. Run migrations in database postgres: yarn migration:run

6. Open Swagger: http://localhost:3000/swagger#/auth/authSignUp

7. Run e2e test: yarn test:e2e

Configuration

Environment Variables priority:

.env.development.local
.env.development
.env

Installation

$ yarn install

Running the app

# development
$ yarn start

# watch mode
$ yarn start:dev

# development in docker
$ yarn docker:up
$ yarn docker:logs

# production mode
$ yarn start:prod

Test

# unit tests
$ yarn test

# e2e tests
$ yarn test:e2e

# test coverage
$ yarn test:cov