how to load toml settings (GOLANG)

I'm trying to use toml to store the connection settings of a database.
I want to load these settings that are in a config.toml file and thus do my operations

I tried the following:
go code:

func Init() *sql.DB {

	config, err := toml.LoadFile("config.toml")
	if err != nil {
		log.Fatal("Erro ao carregar variaveis de ambiente")
	}

	host := config.Get("postgres.host").(string)
	port := config.Get("postgres.port").(string)
	user := config.Get("postgres.user").(string)
	password := config.Get("postgres.password").(string)
	dbname := config.Get("postgres.dbname").(string)

	stringConnection := fmt.Sprintf("host=%s port=%s user=%s password=%s dbname=%s", host, port, user, password, dbname)

	db, err := sql.Open("postgres", stringConnection)

	if err != nil {
		panic(err)
	}
	fmt.Println("Sucesso ao realizar conexão com o banco de dados")

	err = db.Ping()
	return db
}

config.toml:

[postgres]
host = "localhost"
port =  5432
user = "postgres"
password = "ivaneteJC"
dbname = "webhook"

this attempt is returning an error, which unfortunately I do not know how to proceed

error:

panic: interface conversion: interface {} is int64, not string

Any solution ?

As for your error, like @tkausl said, you define port as integer, and not a string, yet you do type assertion of the value to string in this line

port := config.Get("postgres.port").(string)

Change the string to int64 like the error said and you should be fine.

Are you using the https://github.com/pelletier/go-toml package? If so, this package seems to also support unmarshalling config files into Go struct directly. This is a more convenient approach instead of having to config.Get each config one by one.

    type PostgreConfig struct {
		Host     string
		Port     int
		User     string
		Password string
		Dbname   string
	}

	type MyConfig struct {
		Postgres *PostgreConfig
	}

	// Read the toml file content
	doc, err := os.ReadFile("config.toml")
	if err != nil {
		panic(err)
	}

	// Parse the content
	var cfg MyConfig
	err = toml.Unmarshal(doc, &cfg)
	if err != nil {
		panic(err)
	}

	fmt.Println(cfg.Postgres.Host)
	fmt.Println(cfg.Postgres.Port)

The solution with minimal changes：

// solution 1
port := config.Get("postgres.port")
stringConnection := fmt.Sprintf("host=%s port=%v user=%s password=%s dbname=%s", host, port, user, password, dbname)

// solution 2
port := config.Get("postgres.port").(int64)
stringConnection := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s", host, port, user, password, dbname)

// solution 3
// config.toml
port =  "5432"