cache local instance (#572)

* cache local instance

fix #564

* don't use local instance cache for plm

* use instance cache for plm, but initialize it

* cargo fmt

plume-cli/src/main.rs

@@ -6,7 +6,7 @@ extern crate rpassword;
 
 use clap::App;
 use diesel::Connection;
-use plume_models::{Connection as Conn, CONFIG};
+use plume_models::{instance::Instance, Connection as Conn, CONFIG};
 use std::io::{self, prelude::*};
 
 mod instance;
@@ -27,6 +27,7 @@ fn main() {
 
     dotenv::dotenv().ok();
     let conn = Conn::establish(CONFIG.database_url.as_str());
+    let _ = conn.as_ref().map(|conn| Instance::cache_local(conn));
 
     match matches.subcommand() {
         ("instance", Some(args)) => {

plume-cli/src/users.rs

@@ -129,7 +129,7 @@ fn reset_password<'a>(args: &ArgMatches<'a>, conn: &Connection) {
     let user = User::find_by_name(
         conn,
         &username,
-        Instance::get_local(conn)
+        Instance::get_local()
             .expect("Failed to get local instance")
             .id,
     )