Crate envconfig[−][src]
Envconfig 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 envconfig_derive; extern crate envconfig; use std::env; use envconfig::Envconfig; #[derive(Envconfig)] struct Config { #[envconfig(from = "DB_HOST")] pub db_host: String, #[envconfig(from = "DB_PORT")] pub db_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, 5432); }
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.
Enums
Error |
Represents an error, that may be returned by |
Traits
Envconfig |
Indicates that structure can be initialize from environment variables. |
Functions
load_var |
Load a nenvironment variable by name and parse it into type |