feat: add configurability

src/configuration.rs

@@ -0,0 +1,37 @@
+#[derive(serde::Deserialize)]
+pub struct Settings {
+    pub database: DatabaseSettings,
+    pub application_port: u16,
+}
+
+#[derive(serde::Deserialize)]
+pub struct DatabaseSettings {
+    pub username: String,
+    pub password: String,
+    pub port: u16,
+    pub host: String,
+    pub database_name: String,
+}
+
+pub fn get_configuration() -> Result<Settings, config::ConfigError> {
+    // Initialise our configuration reader
+    let settings = config::Config::builder()
+        // Add configuration values from a file named `configuration.yaml`.
+        .add_source(config::File::new(
+            "configuration.yaml",
+            config::FileFormat::Yaml,
+        ))
+        .build()?;
+    // Try to convert the configuration values it read into
+    // our Settings type
+    settings.try_deserialize::<Settings>()
+}
+
+impl DatabaseSettings {
+    pub fn connection_string(&self) -> String {
+        format!(
+            "postgres://{}:{}@{}:{}/{}",
+            self.username, self.password, self.host, self.port, self.database_name
+        )
+    }
+}

src/main.rs

@@ -1,9 +1,11 @@
-use tokio::net::TcpListener;
 use learn_axum::startup;
+use learn_axum::configuration::get_configuration;
+use tokio::net::TcpListener;
 
 #[tokio::main]
 async fn main() {
-    let addr = format!("127.0.0.1:{}", "3000");
+    let configuration = get_configuration().expect("Failed to read configuration.");
+    let addr = format!("127.0.0.1:{}", configuration.application_port);
     let listener = TcpListener::bind(addr).await.unwrap(); //.expect("Unable to bind to port");
     startup::run(listener).await.unwrap();
 }