[−][src]Crate yasec
Yasec is a Rust library that helps to initialize configuration structure from environment variables. It makes use of custom derive macros to reduce boilerplate.
Example
#[macro_use] extern crate yasec_derive; extern crate yasec; use std::env; use yasec::Yasec; #[derive(Yasec)] struct Config { #[yasec(from = "DB_HOST")] pub db_host: String, #[yasec(from = "DB_PORT")] pub db_port: Option<u16>, #[yasec(from = "HTTP_PORT", default = 8080)] pub http_port: u16, } fn main() { // We assume that those environment variables are set somewhere outside env::set_var("DB_HOST", "localhost"); env::set_var("DB_PORT", "5432"); // Initialize config from environment variables let config = Config::init().unwrap(); assert_eq!(config.db_host, "localhost"); assert_eq!(config.db_port, Some(5432)); assert_eq!(config.http_port, 8080); }
The library uses std::str::FromStr
trait to convert environment variables into custom
data type. So, if your data type does not implement std::str::FromStr
the program
will not compile.
Structs
Context | |
Error | |
ParseError |
Traits
Yasec | Indicates that structure can be initialize from environment variables. |