Golang: read yaml (v3) config

config.go

package config

import (
	"fmt"
	"io/ioutil"

	"gopkg.in/yaml.v3"
)

type Config struct {
	Client struct {
   		IP       string
		Port     int
		User     string
		Password string
	}
	Server struct {
  		IP    string
		Port  int
	}
}

func ReadConfig(filename string) (*Config, error) {
	buf, err := ioutil.ReadFile(filename)
	if err != nil {
		return nil, err
	}

	cfg := &Config{}
	err = yaml.Unmarshal(buf, cfg)
	if err != nil {
		return nil, fmt.Errorf("in file %q: %v", filename, err)
	}

	return cfg, nil
}

config.yml

Client:
  IP: 1.2.3.4
  Port: 8080
  User: Paul
  Password: secret
Server:
  IP: 0.0.0.0
  Port: 8080

usage.md

Usage

cfg, err := config.ReadConfig("./config.yml")
if err != nil {
	fmt.Fatal(err)
}

fmt.Printf("%s", cfg.Client.IP)