goenv

The goenv is used to map environment variables to go struct.

Installation

go get -u github.com/proproto/goenv

Example

type MySQLConfig struct {
	Host     string        `env:"MYSQL_HOST,default=localhost:3306"`
	User     string        `env:"MYSQL_USER,default=root"`
	Password string        `env:"MYSQL_PASSWORD"`
	Database string        `env:"MYSQL_DATABASE,required"`
	Timeout  time.Duration `env:"MYSQL_TIMEOUT,default=10s"`
	TLS      bool          `env:"MYSQL_TLS_ENABLED"`
	MaxConns int           `env:"MYSQL_MAX_CONNS"`
}

os.Clearenv()
os.Setenv("MYSQL_PASSWORD", "db_password")
os.Setenv("MYSQL_DATABASE", "db_name")
os.Setenv("MYSQL_TLS_ENABLED", "true")
os.Setenv("MYSQL_MAX_CONNS", "32")

config := MySQLConfig{}
goenv.MustBind(&config)

fmt.Printf("Host: %s\n", config.Host)
fmt.Printf("User: %s\n", config.User)
fmt.Printf("Password: %s\n", config.Password)
fmt.Printf("Database: %s\n", config.Database)
fmt.Printf("Timeout: %v\n", config.Timeout.String())
fmt.Printf("TLS: %v\n", config.TLS)
fmt.Printf("MaxConns: %v\n", config.MaxConns)
// Output:
// Host: localhost:3306
// User: root
// Password: db_password
// Database: db_name
// Timeout: 10s
// TLS: true
// MaxConns: 32