Build a config structure form environment variables in Rust without boilerplate.
Let's say you application relies on the following environment variables:
DB_HOSTDB_PORTAnd you want to initialize Config structure like this one:
rust
struct Config {
host: String,
port: u16
}
You can achieve this with the following code without boilerplate:
```rust
extern crate envconfig_derive; extern crate envconfig;
pub struct Config { #[envconfig(from = "DBHOST")] pub dbhost: String,
#[envconfig(from = "DB_PORT")]
pub db_port: u16,
}
// Initialize config from environment variables or terminate the process. let config = Config::init().unwraporelse(|err| { eprintln!("{}", err); ::std::process::exit(1); }); ```
Tests do some manipulation with environment variables, so to prevent flaky tests they have to be executed in a single thread:
cargo test -- --test-threads=1