feat: implement a simple singleton process

src-tauri/src/utils/mod.rs

@@ -5,4 +5,5 @@ pub mod clash;
 pub mod config;
 pub mod fetch;
 pub mod init;
+pub mod server;
 pub mod sysopt;

src-tauri/src/utils/server.rs

@@ -0,0 +1,38 @@
+extern crate warp;
+
+use port_scanner::local_port_available;
+use tauri::{AppHandle, Manager};
+use warp::Filter;
+
+const SERVER_PORT: u16 = 33333;
+
+/// check whether there is already exists
+pub fn check_singleton() -> Result<(), ()> {
+  if !local_port_available(SERVER_PORT) {
+    tauri::async_runtime::block_on(async {
+      let url = format!("http://127.0.0.1:{}/commands/visible", SERVER_PORT);
+      reqwest::get(url).await.unwrap();
+      Err(())
+    })
+  } else {
+    Ok(())
+  }
+}
+
+/// The embed server only be used to implement singleton process
+/// maybe it can be used as pac server later
+pub fn embed_server(app: &AppHandle) {
+  let window = app.get_window("main").unwrap();
+
+  let commands = warp::path!("commands" / "visible").map(move || {
+    window.show().unwrap();
+    window.set_focus().unwrap();
+    return format!("ok");
+  });
+
+  tauri::async_runtime::spawn(async move {
+    warp::serve(commands)
+      .bind(([127, 0, 0, 1], SERVER_PORT))
+      .await;
+  });
+}