From 1fb4a5151bd8cfe6de4d8c19e2066a9281a0b61a Mon Sep 17 00:00:00 2001
From: Ilion Beyst <ilion.beyst@gmail.com>
Date: Wed, 29 Dec 2021 16:11:27 +0100
Subject: migrate to axum

---
 backend/src/lib.rs | 95 ++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 71 insertions(+), 24 deletions(-)

(limited to 'backend/src/lib.rs')

diff --git a/backend/src/lib.rs b/backend/src/lib.rs
index 8807637..665523f 100644
--- a/backend/src/lib.rs
+++ b/backend/src/lib.rs
@@ -1,10 +1,5 @@
 #![feature(proc_macro_hygiene, decl_macro)]
 
-use rocket::{Build, Rocket};
-use rocket_sync_db_pools::database;
-
-#[macro_use]
-extern crate rocket;
 #[macro_use]
 extern crate diesel;
 
@@ -12,27 +7,79 @@ pub mod db;
 pub mod routes;
 pub mod schema;
 
-#[database("postgresql_database")]
-pub struct DbConn(diesel::PgConnection);
+use std::ops::Deref;
+
+use axum;
+use bb8::PooledConnection;
+use bb8_diesel::{self, DieselConnectionManager};
+use diesel::PgConnection;
 
-#[get("/")]
-fn index() -> &'static str {
+use axum::{
+    async_trait,
+    extract::{Extension, FromRequest, RequestParts},
+    http::StatusCode,
+    routing::{get, post},
+    AddExtensionLayer, Router,
+};
+
+async fn index_handler() -> &'static str {
     "Hello, world!"
 }
 
-pub fn rocket() -> Rocket<Build> {
-    rocket::build()
-        .mount(
-            "/",
-            routes![
-                index,
-                routes::users::register,
-                routes::users::login,
-                routes::users::current_user,
-                routes::bots::create_bot,
-                routes::bots::get_bot,
-                routes::bots::upload_bot_code,
-            ],
-        )
-        .attach(DbConn::fairing())
+type ConnectionPool = bb8::Pool<DieselConnectionManager<PgConnection>>;
+
+pub async fn app() -> Router {
+    let database_url = "postgresql://planetwars:planetwars@localhost/planetwars";
+    let manager = DieselConnectionManager::<PgConnection>::new(database_url);
+    let pool = bb8::Pool::builder().build(manager).await.unwrap();
+
+    let app = Router::new()
+        .route("/", get(index_handler))
+        .route("/users/register", post(routes::users::register))
+        .route("/users/login", post(routes::users::login))
+        .route("/users/me", get(routes::users::current_user))
+        .route("/bots", post(routes::bots::create_bot))
+        .route("/bots/:bot_id", get(routes::bots::get_bot))
+        .route("/bots/:bot_id/upload", post(routes::bots::upload_bot_code))
+        .layer(AddExtensionLayer::new(pool));
+    app
+}
+
+// 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>>);
+
+impl Deref for DatabaseConnection {
+    type Target = PooledConnection<'static, DieselConnectionManager<PgConnection>>;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+#[async_trait]
+impl<B> FromRequest<B> for DatabaseConnection
+where
+    B: Send,
+{
+    type Rejection = (StatusCode, String);
+
+    async fn from_request(req: &mut RequestParts<B>) -> Result<Self, Self::Rejection> {
+        let Extension(pool) = Extension::<ConnectionPool>::from_request(req)
+            .await
+            .map_err(internal_error)?;
+
+        let conn = pool.get_owned().await.map_err(internal_error)?;
+
+        Ok(Self(conn))
+    }
+}
+
+/// Utility function for mapping any error into a `500 Internal Server Error`
+/// response.
+fn internal_error<E>(err: E) -> (StatusCode, String)
+where
+    E: std::error::Error,
+{
+    (StatusCode::INTERNAL_SERVER_ERROR, err.to_string())
 }
-- 
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