core/emgauwa-core/src/settings.rs

use config::Config;
use serde_derive::Deserialize;

#[derive(Clone, Debug, Deserialize)]
#[serde(default)]
#[allow(unused)]
pub struct Logging {
	pub level: String,
	pub file: String,
}

#[derive(Clone, Debug, Deserialize)]
#[serde(default)]
#[allow(unused)]
pub struct Settings {
	pub database: String,
	pub port: u16,
	pub host: String,
	pub logging: Logging,
}

impl Default for Settings {
	fn default() -> Self {
		Settings {
			database: String::from("sqlite://emgauwa-core.sqlite"),
			port: 5000,
			host: String::from("127.0.0.1"),
			logging: Logging::default(),
		}
	}
}

impl Default for Logging {
	fn default() -> Self {
		Logging {
			level: String::from("info"),
			file: String::from("stdout"),
		}
	}
}

pub fn init() -> Settings {
	Config::builder()
		.add_source(config::File::with_name("emgauwa-core"))
		.add_source(
			config::Environment::with_prefix("EMGAUWA")
				.prefix_separator("_")
				.separator("__"),
		)
		.build()
		.unwrap()
		.try_deserialize::<Settings>()
		.unwrap_or_else(|_| panic!("Error reading settings."))
}