implement basic configuration

planetwars-server/Cargo.toml

@@ -24,6 +24,7 @@ base64 = "0.13.0"
 zip = "0.5"
 toml = "0.5"
 planetwars-matchrunner = { path = "../planetwars-matchrunner" }
+config = { version = "0.12", features = ["toml"] }
 
 # TODO: remove me
 shlex = "1.1"

planetwars-server/configuration.toml

@@ -0,0 +1 @@
+database_url = "postgresql://planetwars:planetwars@localhost/planetwars"

planetwars-server/src/lib.rs

@@ -14,6 +14,7 @@ use axum;
 use bb8::PooledConnection;
 use bb8_diesel::{self, DieselConnectionManager};
 use diesel::PgConnection;
+use serde::Deserialize;
 
 use axum::{
     async_trait,
@@ -30,9 +31,8 @@ const MAPS_DIR: &str = "./data/maps";
 
 type ConnectionPool = bb8::Pool<DieselConnectionManager<PgConnection>>;
 
-pub async fn api() -> Router {
-    let database_url = "postgresql://planetwars:planetwars@localhost/planetwars";
-    let manager = DieselConnectionManager::<PgConnection>::new(database_url);
+pub async fn api(configuration: Configuration) -> Router {
+    let manager = DieselConnectionManager::<PgConnection>::new(configuration.database_url);
     let pool = bb8::Pool::builder().build(manager).await.unwrap();
 
     let api = Router::new()
@@ -64,10 +64,22 @@ pub async fn api() -> Router {
 }
 
 pub async fn app() -> Router {
-    let api = api().await;
+    let configuration = config::Config::builder()
+        .add_source(config::File::with_name("configuration.toml"))
+        .add_source(config::Environment::with_prefix("PLANETWARS"))
+        .build()
+        .unwrap()
+        .try_deserialize()
+        .unwrap();
+    let api = api(configuration).await;
     Router::new().nest("/api", api)
 }
 
+#[derive(Deserialize)]
+pub struct Configuration {
+    pub database_url: String,
+}
+
 // we can also write a custom extractor that grabs a connection from the pool
 // which setup is appropriate depends on your application
 pub struct DatabaseConnection(PooledConnection<'static, DieselConnectionManager<PgConnection>>);