feat: fixup "setup seaorm and a first "debug" entity as example"

crates/backend/src/db.rs

@@ -0,0 +1,11 @@
+use migration::{Migrator, MigratorTrait};
+use sea_orm::{Database, DatabaseConnection, DbErr};
+use std::env;
+
+pub async fn get_connection() -> Result<DatabaseConnection, DbErr> {
+    let database_url = env::var("DATABASE_URL").expect("DATABASE_URL must be set");
+
+    let db_connection = Database::connect(database_url).await?;
+    Migrator::up(&db_connection, None).await?;
+    Ok(db_connection)
+}

crates/backend/src/lib.rs

@@ -2,10 +2,13 @@ use anyhow::Error as AnyError;
 use axum::http::{StatusCode, Uri};
 use axum::response::{IntoResponse, Response};
 use axum::{routing::get, Router};
+use sea_orm::{DatabaseConnection, DbErr};
 use thiserror::Error;
 
 use ::utils::config::{load_config, ConfigError};
 
+mod db;
+
 #[derive(Error, Debug)]
 pub enum InitError {
     #[error(transparent)]
@@ -17,10 +20,17 @@ pub fn init() -> Result<(), InitError> {
     Ok(())
 }
 
-pub fn get_router() -> Router {
-    Router::new()
+#[derive(Clone)]
+pub struct AppState {
+    db_connection: DatabaseConnection,
+}
+
+pub async fn get_router() -> Result<Router, DbErr> {
+    let db_connection = db::get_connection().await?;
+
+    Ok(Router::new()
         .route("/", get(|| async { "Hello, world!" }))
-        .fallback(fallback)
+        .fallback(fallback))
 }
 
 async fn fallback(uri: Uri) -> (StatusCode, String) {

crates/backend/src/main.rs

@@ -10,16 +10,17 @@ pub enum BackendError {
     ServeTCPListener(#[from] std::io::Error),
     #[error("Error while initialising the backend")]
     InitError(#[from] InitError),
+    #[error("Error with the database connection")]
+    DatabaseConnection(#[from] sea_orm::DbErr),
 }
 
 #[tokio::main]
 async fn main() -> Result<(), BackendError> {
     init()?;
 
-    let app = get_router();
+    let app = get_router().await?;
 
     let mut listenfd = ListenFd::from_env();
-
     let listener = match listenfd.take_tcp_listener(0)? {
         // if we are given a tcp listener on listen fd 0, we use that one
         Some(listener) => {