Leggere file TOML in Go

In questo articolo vediamo come leggere un file TOML in Go.

Useremo la libreria useremo BurntSushi/toml.

Per installarla:

go get github.com/BurntSushi/toml

Questo il file TOML:

title = "Test TOML"
version = "1.0.0"

[database]
host = "localhost"
port = 5432
username = "root"
password = "password"
databases = ["db_test"]
pool_size = 10
ssl_enabled = true

[server]
host = "0.0.0.0"
port = 8080
debug = false
allowed_hosts = ["*"]

[logging]
level = "INFO"
format = "%(asctime)s - %(levelname)s - %(message)s"
handlers = ["console", "file"]

[cache]
enabled = true
ttl = 3600
max_size = 1000

[features]
enable_api = true
rate_limit = 100

Qui sotto un pò di codice:

package main

import (
	"fmt"
	"log"

	"github.com/BurntSushi/toml"
)

type Config struct {
	Title    string   `toml:"title"`
	Version  string   `toml:"version"`
	Database Database `toml:"database"`
	Server   Server   `toml:"server"`
	Logging  Logging  `toml:"logging"`
	Cache    Cache    `toml:"cache"`
	Features Features `toml:"features"`
}

type Database struct {
	Host       string   `toml:"host"`
	Port       int      `toml:"port"`
	Username   string   `toml:"username"`
	Password   string   `toml:"password"`
	Databases  []string `toml:"databases"`
	PoolSize   int      `toml:"pool_size"`
	SSLEnabled bool     `toml:"ssl_enabled"`
}

type Server struct {
	Host         string   `toml:"host"`
	Port         int      `toml:"port"`
	Debug        bool     `toml:"debug"`
	AllowedHosts []string `toml:"allowed_hosts"`
}

type Logging struct {
	Level    string   `toml:"level"`
	Format   string   `toml:"format"`
	Handlers []string `toml:"handlers"`
}

type Cache struct {
	Enabled bool `toml:"enabled"`
	TTL     int  `toml:"ttl"`
	MaxSize int  `toml:"max_size"`
}

type Features struct {
	EnableAPI bool `toml:"enable_api"`
	RateLimit int  `toml:"rate_limit"`
}

func main() {
	var config Config

	if _, err := toml.DecodeFile("test.toml", &config); err != nil {
		log.Fatal(err)
	}

	fmt.Printf("Title: %sn", config.Title)
	fmt.Printf("Version: %sn", config.Version)
	fmt.Printf("Database Host: %sn", config.Database.Host)
	fmt.Printf("Database Port: %dn", config.Database.Port)
	fmt.Printf("Server Port: %dn", config.Server.Port)
	fmt.Printf("Cache Enabled: %tn", config.Cache.Enabled)
	fmt.Printf("Databases: %vn", config.Database.Databases)
}

Enjoy!