Create Config and config_load

src/server/config.rs

@@ -0,0 +1,22 @@
+use serde::Deserialize;
+
+#[derive(Debug, Clone, Deserialize)]
+#[derive(Debug, Clone, Deserialize)]
+/// Top-level application configuration
+pub struct Config {}
+
+/// Parse configuration from the expected files and environment variables
+pub fn load_config() -> Result<Config, config::ConfigError> {
+    use config::{Environment, File};
+
+    let pkg_name = env!("CARGO_PKG_NAME");
+
+    config::Config::builder()
+        .set_default("server.port", 8080)?
+        .add_source(File::with_name(&format!("/etc/{pkg_name}/config")).required(false))
+        .add_source(File::with_name(&format!("/etc/{pkg_name}")).required(false))
+        .add_source(File::with_name("config").required(false))
+        .add_source(Environment::with_prefix(pkg_name).separator("_"))
+        .build()?
+        .try_deserialize()
+}

src/server/mod.rs

@@ -1,3 +1,4 @@
 pub mod main;
+pub mod config;
 
 pub use main::main;