Golang Starter Kit

A starter kit written in Golang + Ports and Adapters structure on top of https://github.com/golang-standards/project-layout

Getting Started

1. git clone [email protected]/yuraxdrumz/golang-starter-kit
2. go install github.com/golangci/golangci-lint/cmd/[email protected]
3. Run brew install pre-commit / pip install pre-commit
4. Run pre-commit install

If you want to check pre-commit hook on current folder run pre-commit run --all-files

Prerequisites

Ports and Adapters divides your code to 3 parts:

• Business-logic - These are your business rules + types, implemented without any dependency on 3rd party modules (self-contained)
• Ports - Interfaces to speak with your business rules
• Adapters - Implementations of the ports, There are two kinds of adapters:
• In(Driver) - your external API to the world. For example - internal/pkg/adapters/in/http.go
• Out(Driven) - what your business logic uses. For example - internal/pkg/adapters/out/reverser/in-memory.go

Usually, you divide ports and adapters to separate directories, but the best practice in golang is to keep structs near implementations. That is why, I decided to add ports.go near each adapter.

Adding a new business logic:

1. Create appropriate structs in ports.go file under internal/app/your-use-case/ports.go
2. Create your use-case with your application specific logic under internal/app/your-use-case/logic.go
3. Create your in/out adapter, for example - Repository(out) or gRPC(in). internal/pkg/adapters/*
4. Tests!!! your-file-name_test.go under same directory as file internal/app/your-use-case/logic_test.go

Installing Packages

go get -u <repository-name>

Running the service

go run main.go

Environment Variables

To read environement variables, this service uses envconfig library, which allows defining a struct of environment variables. You can easily add new variables under internal/pkg/adapters/out/env

The default is:

type Specification struct {
  LogLevel    string `envconfig:"LOG_LEVEL" default:"info"`
  Port        string `envConfig:"PORT" default:"8080"`
}

By default this service looks for .env in root folder.

Logging

The repo uses logrus logger to write to stdout.

To change log level change the LOG_LEVEL environment variable

Possible log levels:

• info - default
• debug
• error
• warn
• fatal

Pre Commit

You can add any pre commit hooks to .pre-commit-config.yaml if needed