/docker_test

once the docker workflow changes, a new docker will be generated and uploaded to ECR

Primary LanguageGo

Simple Bank

This repository contains the codes of the Backend Master Class course by TECH SCHOOL on our Youtube channel.

Backend master class

You can also find it on Udemy at this link.

In this course, you will learn step-by-step how to design, develop and deploy a backend web service from scratch. I believe the best way to learn programming is to build a real application. Therefore, throughout the course, you will learn how to build a backend web service for a simple bank. It will provide APIs for the frontend to do the following things:

  • Create and manage bank accounts.
  • Record all balance changes to each of the accounts.
  • Perform a money transfer between 2 accounts.

The programming language we will use to develop the service is Golang, but the course is not just about coding in Go. The course is divided into 3 main parts:

  1. In the first part, you will learn deeply about how to design the database, generate codes to talk to the DB in a consistent and reliable way using transactions, understand the DB isolation levels, and how to use it correctly in production. Besides the database, you will also learn how to use docker for local development, how to use Git to manage your codes, and how to use Github Action to run unit tests automatically.

  2. In the second part, you will learn how to build a set of RESTful HTTP APIs using Gin - one of the most popular Golang frameworks for building web services. This includes everything from loading app configs, mocking DB for more robust unit tests, handling errors, authenticating users, and securing the APIs with JWT and PASETO access tokens.

  3. In the last part, you will learn how to build your app with Docker and deploy it to a production Kubernetes cluster on AWS. The lectures are very detailed with a step-by-step guide, from how to build a minimal docker image, set up a free-tier AWS account, create a production database, store and retrieve production secrets, create a Kubernetes cluster with EKS, use Github Action to automatically build and deploy the image to the EKS cluster, buy a domain name and route the traffics to the service, secure the connection with HTTPs and auto-renew TLS certificate from Let's Encrypt.

This course is designed with a lot of details, so that everyone, even with very little programming experience can understand and do it by themselves. I strongly believe that after the course, you would be able to work much more confidently and effectively in your projects.

Course videos

Simple bank service

The service that we’re going to build is a simple bank. It will provide APIs for the frontend to do following things:

  1. Create and manage bank accounts, which are composed of owner’s name, balance, and currency.
  2. Record all balance changes to each of the account. So every time some money is added to or subtracted from the account, an account entry record will be created.
  3. Perform a money transfer between 2 accounts. This should happen within a transaction, so that either both accounts’ balance are updated successfully or none of them are.

Setup local development

Install tools

Setup infrastructure

  • Create the bank-network

    make network

  • Start postgres container:

    make postgres

  • Create simple_bank database:

    make createdb

  • Run db migration up all versions:

    make migrateup

  • Run db migration up 1 version:

    make migrateup1

  • Run db migration down all versions:

    make migratedown

  • Run db migration down 1 version:

    make migratedown1

Documentation

  • Generate DB documentation:

    make db_docs

  • Access the DB documentation at this address. Password: secret

How to generate code

  • Generate schema SQL file with DBML:

    make db_schema

  • Generate SQL CRUD with sqlc:

    make sqlc

  • Generate DB mock with gomock:

    make mock

  • Create a new db migration:

    migrate create -ext sql -dir db/migration -seq <migration_name>

How to run

  • Run server:

    make server

  • Run test:

    make test

Deploy to kubernetes cluster