Limit data sent on /_yui/instances

Don't send ssh key and user-data when listing all hosts, to save on data

README.md

@@ -4,7 +4,7 @@ Server application that provides cloud-init metadata via the `nocloud-net` provi
 
 ## Requirements
 
-Only sqlite3 dev libraries are required for Diesel.
+Only sqlite3 dev libraries are required for sea-orm.
 
 ## Configuration
 
@@ -20,33 +20,4 @@ This outputs the API key and the relevant config snippet you'll need to add to `
 
 All API endpoints require an `X-API-Key` header with the key generated above, and for the API client to be connected via localhost. \todo Allow overriding the latter requirement, if needed
 
-To create an instance (all requests sent to `http://[::1]`):
-```
-> POST /_yui/instances HTTP/1.1
-> X-API-Key: Your_API_Key
-> Content-type: application/json
-> [...]
-> 
-> {
->     "name": "instance_hostname",
->     "os_name": "netbsd|debian|invalid",
->     "mac_address": "0a:42:01:23:45:67"
-> }
-> 
-< HTTP/1.1 201 Created
-< Content-type: application/json
-< [...]
-< 
-< {
-<     "error": null,
-<     "instances": [
-<         {
-<             "id": 591750913,
-<             "name": "instance_hostname",
-<             "os_name": "netbsd|debian|invalid",
-<             "mac_address": "0a:42:01:23:45:67"
-<         }
-<     ]
-< }
-}
-```
+\todo HTTP API endpoints/usage

src/entity/instance_info.rs

@@ -10,7 +10,9 @@ pub struct Model {
     pub id: u32,
     pub hostname: String,
     pub mac_address: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub ssh_keys: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub user_data: Option<Vec<u8>>,
 }
 

src/yui/routes.rs

@@ -10,6 +10,7 @@ use crate::Instances;
 use rocket::serde::json::Json;
 use rocket_db_pools::Connection;
 use sea_orm::ActiveValue::{NotSet, Set};
+use sea_orm::QuerySelect;
 use sea_orm::{
     ActiveModelTrait, ColumnTrait, EntityTrait, ModelTrait, PaginatorTrait, QueryFilter,
 };
@@ -97,7 +98,13 @@ pub async fn get_instances(
     db: Connection<Instances>,
     _api: APIUser,
 ) -> Result<Json<InstanceResponse>, APIError> {
-    match instance_info::Entity::find().all(&*db).await {
+    match instance_info::Entity::find()
+        .column(instance_info::Column::Id)
+        .column(instance_info::Column::MacAddress)
+        .column(instance_info::Column::Hostname)
+        .all(&*db)
+        .await
+    {
         Ok(v) => Ok(Json(InstanceResponse::new(v))),
         Err(err) => Err(api_err!(
             InternalServerError,