added crates to public project, made api structure

backend/public/src/main.rs

@@ -1,3 +1,46 @@
-fn main() {
-    println!("Hello, world!");
+use axum::{
+    routing::{get, post},
+    Router,
+};
+use sqlx::postgres::PgPoolOptions;
+use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
+
+use std::time::Duration;
+use tokio::net::TcpListener;
+
+mod datasources;
+mod routes;
+
+#[tokio::main]
+async fn main() {
+    let _ = dotenvy::dotenv();
+    tracing_subscriber::registry()
+        .with(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| format!("{}=debug", env!("CARGO_CRATE_NAME")).into()),
+        )
+        .with(tracing_subscriber::fmt::layer())
+        .init();
+
+    let db_connection_str = std::env::var("DATABASE_URL")
+        .unwrap_or_else(|_| "postgres://postgres:password@localhost".to_string());
+
+    // set up connection pool
+    let pool = PgPoolOptions::new()
+        .max_connections(10)
+        .acquire_timeout(Duration::from_secs(3))
+        .connect(&db_connection_str)
+        .await
+        .expect("can't connect to database");
+
+    // build our application with some routes
+    let app = Router::new()
+        .route("/", get(routes::root::RootRoute::root))
+        .fallback(routes::root::RootRoute::not_found)
+        .with_state(pool);
+
+    // run it with hyper
+    let listener = TcpListener::bind("0.0.0.0:3000").await.unwrap();
+    tracing::debug!("listening on {}", listener.local_addr().unwrap());
+    axum::serve(listener, app).await.unwrap();
 }