package main

import (
	"fmt"

	toml "github.com/pelletier/go-toml"
)

type Config struct {
	DBCluster *DBClusterConfig `toml:"db_cluster"`
}

type DBConfig struct {
	User     string `toml:"user"`
	Password string `toml:"password"`
	Database string `toml:"database"`
}

type DBClusterConfig struct {
	DBConfig

	Sharding  []int
	ShardsNum int `toml:"shards_num"`
}

func main() {
	doc := []byte(`
		[db_cluster]
		user = "test_user"
		password = "password"
		database = "shard_test"

		shards_num = 2
		sharding = [0]
	`)

	config := Config{}
	toml.Unmarshal(doc, &config)
	fmt.Println("user=", config.DBCluster.User)
	fmt.Println("ShardsNum=", config.DBCluster.ShardsNum)
}