Load runtime config in App (wasm fetch) and provide async loader; use DEFAULT_STUN_SERVER fallback

Cargo.lock

@@ -2681,6 +2681,7 @@ dependencies = [
  "dioxus",
  "dioxus-logger",
  "futures",
+ "gloo-net",
  "js-sys",
  "log",
  "serde",

Cargo.toml

@@ -51,6 +51,7 @@ console_log = "1.0.0"
 serde = { version = "1.0.142", features = ["derive"] }
 serde_json = "1.0.100"
 futures = "0.3.31"
+gloo-net = "0.6"
 
 [features]
 default = ["web"]

src/config.rs

@@ -22,3 +22,31 @@ impl Config {
         Self::from_file("appsettings.json")
     }
 }
+
+// WASM runtime loader: fetch `appsettings.json` from the hosting origin
+#[cfg(target_arch = "wasm32")]
+pub async fn load_config_from_server() -> Result<Config, Box<dyn std::error::Error>> {
+    // lazy import gloo-net to avoid non-wasm compile errors
+    let resp = gloo_net::http::Request::get("appsettings.json").send().await?;
+    let text = resp.text().await?;
+    let cfg: Config = serde_json::from_str(&text)?;
+    Ok(cfg)
+}
+
+// Native loader convenience wrapper (blocking-friendly)
+#[cfg(not(target_arch = "wasm32"))]
+pub async fn load_config_from_server() -> Result<Config, Box<dyn std::error::Error>> {
+    // On native we can just read the file synchronously and return
+    Ok(Config::from_file("appsettings.json")?)
+}
+
+/// High-level loader with fallbacks: try wasm fetch (or native read), otherwise fallback to defaults.
+pub async fn load_config_or_default() -> Config {
+    // Try to load via the async loader
+    if let Ok(cfg) = load_config_from_server().await {
+        return cfg;
+    }
+
+    // Fallback default
+    Config { server: ServerOptions { stun_server: crate::constants::DEFAULT_STUN_SERVER.to_string() } }
+}

src/main.rs

@@ -3,8 +3,8 @@
 mod components;
 mod models;
 mod utils;
-mod constants;
 mod config;
+mod constants;
 
 use dioxus::prelude::*;
 use log::Level;
@@ -22,11 +22,26 @@ fn main() {
 }
 
 #[component]
-fn App() -> Element {
-    rsx! {
-        document::Link { rel: "icon", href: FAVICON }
-        document::Link { rel: "stylesheet", href: MAIN_CSS }
-        Content {}
+fn App(cx: Scope) -> Element {
+    // Component state for loaded config
+    let cfg_state = use_state(cx, || None::<crate::config::Config>);
+
+    // Kick off async config load once
+    use_future(cx, (), |_| {
+        let cfg_state = cfg_state.clone();
+        async move {
+            let cfg = crate::config::load_config_or_default().await;
+            cfg_state.set(Some(cfg));
+        }
+    });
+
+    match cfg_state.get().as_ref() {
+        None => rsx!( div { "Lade Konfiguration…" } ),
+        Some(_cfg) => rsx! {
+            document::Link { rel: "icon", href: FAVICON }
+            document::Link { rel: "stylesheet", href: MAIN_CSS }
+            Content {}
+        }
     }
 }