Restructure

Move some code out to other files. Add transaction guard

web/src/guards/transaction.rs

@@ -0,0 +1,34 @@
+use rocket::{
+    http::Status,
+    request::{FromRequest, Outcome},
+    Request, State,
+};
+use sqlx::Pool;
+
+use crate::Database;
+
+pub(crate) struct Transaction<'a>(sqlx::Transaction<'a, Database>);
+
+#[derive(Debug)]
+pub(crate) enum TransactionError {
+    Error(sqlx::Error),
+    Missing,
+}
+
+#[rocket::async_trait]
+impl<'r> FromRequest<'r> for Transaction<'r> {
+    type Error = TransactionError;
+
+    async fn from_request(request: &'r Request<'_>) -> Outcome<Self, Self::Error> {
+        match request.guard::<&State<Pool<Database>>>().await {
+            Outcome::Success(pool) => match pool.begin().await {
+                Ok(transaction) => Outcome::Success(Transaction(transaction)),
+                Err(e) => {
+                    Outcome::Failure((Status::InternalServerError, TransactionError::Error(e)))
+                }
+            },
+            Outcome::Failure(e) => Outcome::Failure((e.0, TransactionError::Missing)),
+            Outcome::Forward(f) => Outcome::Forward(f),
+        }
+    }
+}