Adding live reloading of config.hjson changes through UI.

- https://stackoverflow.com/questions/61159698/update-re-initialize-a-var-defined-in-lazy-static/61161271#61161271
- https://stackoverflow.com/questions/29654927/how-do-i-assign-a-string-to-a-mutable-static-variable/47181804#47181804

server/src/api/user.rs

@@ -253,7 +253,7 @@ impl Perform<LoginResponse> for Oper<Register> {
     // Register the new user
     let user_form = UserForm {
       name: data.username.to_owned(),
-      fedi_name: Settings::get().hostname.to_owned(),
+      fedi_name: Settings::get().hostname,
       email: data.email.to_owned(),
       matrix_user_id: None,
       avatar: None,

server/src/lib.rs

@@ -112,7 +112,7 @@ pub fn send_email(
   to_username: &str,
   html: &str,
 ) -> Result<(), String> {
-  let email_config = Settings::get().email.as_ref().ok_or("no_email_setup")?;
+  let email_config = Settings::get().email.ok_or("no_email_setup")?;
 
   let email = Email::builder()
     .to((to_email, to_username))
@@ -127,7 +127,7 @@ pub fn send_email(
   } else {
     SmtpClient::new(&email_config.smtp_server, ClientSecurity::None).unwrap()
   }
-  .hello_name(ClientId::Domain(Settings::get().hostname.to_owned()))
+  .hello_name(ClientId::Domain(Settings::get().hostname))
   .smtp_utf8(true)
   .authentication_mechanism(Mechanism::Plain)
   .connection_reuse(ConnectionReuseParameters::ReuseUnlimited);

server/src/main.rs

@@ -39,6 +39,7 @@ async fn main() -> io::Result<()> {
 
   // Create Http server with websocket support
   HttpServer::new(move || {
+    let settings = Settings::get();
     App::new()
       .wrap(middleware::Logger::default())
       .data(pool.clone())

server/src/routes/index.rs

@@ -45,6 +45,6 @@ pub fn config(cfg: &mut web::ServiceConfig) {
 
 async fn index() -> Result<NamedFile, actix_web::error::Error> {
   Ok(NamedFile::open(
-    Settings::get().front_end_dir.to_owned() + "/index.html",
+    Settings::get().front_end_dir + "/index.html",
   )?)
 }

server/src/settings.rs

@@ -4,11 +4,12 @@ use serde::Deserialize;
 use std::env;
 use std::fs;
 use std::net::IpAddr;
+use std::sync::RwLock;
 
 static CONFIG_FILE_DEFAULTS: &str = "config/defaults.hjson";
 static CONFIG_FILE: &str = "config/config.hjson";
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Deserialize, Clone)]
 pub struct Settings {
   pub setup: Option<Setup>,
   pub database: Database,
@@ -22,7 +23,7 @@ pub struct Settings {
   pub federation_enabled: bool,
 }
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Deserialize, Clone)]
 pub struct Setup {
   pub admin_username: String,
   pub admin_password: String,
@@ -30,7 +31,7 @@ pub struct Setup {
   pub site_name: String,
 }
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Deserialize, Clone)]
 pub struct RateLimitConfig {
   pub message: i32,
   pub message_per_second: i32,
@@ -40,7 +41,7 @@ pub struct RateLimitConfig {
   pub register_per_second: i32,
 }
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Deserialize, Clone)]
 pub struct EmailConfig {
   pub smtp_server: String,
   pub smtp_login: Option<String>,
@@ -49,7 +50,7 @@ pub struct EmailConfig {
   pub use_tls: bool,
 }
 
-#[derive(Debug, Deserialize)]
+#[derive(Debug, Deserialize, Clone)]
 pub struct Database {
   pub user: String,
   pub password: String,
@@ -60,12 +61,10 @@ pub struct Database {
 }
 
 lazy_static! {
-  static ref SETTINGS: Settings = {
-    match Settings::init() {
+  static ref SETTINGS: RwLock<Settings> = RwLock::new(match Settings::init() {
     Ok(c) => c,
     Err(e) => panic!("{}", e),
-    }
-  };
+  });
 }
 
 impl Settings {
@@ -91,8 +90,8 @@ impl Settings {
   }
 
   /// Returns the config as a struct.
-  pub fn get() -> &'static Self {
-    &SETTINGS
+  pub fn get() -> Self {
+    SETTINGS.read().unwrap().to_owned()
   }
 
   /// Returns the postgres connection url. If LEMMY_DATABASE_URL is set, that is used,
@@ -121,7 +120,15 @@ impl Settings {
 
   pub fn save_config_file(data: &str) -> Result<String, Error> {
     fs::write(CONFIG_FILE, data)?;
-    Self::init()?;
+
+    // Reload the new settings
+    // From https://stackoverflow.com/questions/29654927/how-do-i-assign-a-string-to-a-mutable-static-variable/47181804#47181804
+    let mut new_settings = SETTINGS.write().unwrap();
+    *new_settings = match Settings::init() {
+      Ok(c) => c,
+      Err(e) => panic!("{}", e),
+    };
+
     Self::read_config_file()
   }
 }