Add much stuff for rewrite

src/settings.rs

@@ -0,0 +1,66 @@
+use config::Config;
+use lazy_static::lazy_static;
+use serde_derive::Deserialize;
+use std::sync::RwLock;
+
+#[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"),
+		}
+	}
+}
+
+lazy_static! {
+	static ref SETTINGS: RwLock<Settings> = RwLock::new(Settings::default());
+}
+
+pub fn init() {
+	let 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."));
+
+	*SETTINGS.write().unwrap() = settings;
+}
+
+pub fn get() -> Settings {
+	SETTINGS.read().unwrap().clone()
+}