feat: implement a simple singleton process

src-tauri/src/main.rs

@@ -12,7 +12,11 @@ mod utils;
 
 use crate::{
   events::state,
-  utils::{clash::put_clash_profile, config::read_verge},
+  utils::{
+    clash::put_clash_profile,
+    config::read_verge,
+    server::{check_singleton, embed_server},
+  },
 };
 use std::sync::{Arc, Mutex};
 use tauri::{
@@ -21,6 +25,11 @@ use tauri::{
 };
 
 fn main() -> std::io::Result<()> {
+  if check_singleton().is_err() {
+    println!("app exists");
+    return Ok(());
+  }
+
   let sub_menu = SystemTraySubmenu::new(
     "出站规则",
     SystemTrayMenu::new()
@@ -76,6 +85,9 @@ fn main() -> std::io::Result<()> {
     .build(tauri::generate_context!())
     .expect("error while running tauri application");
 
+  // a simple http server
+  embed_server(&app.handle());
+
   // init app config
   utils::init::init_app(app.package_info());
   // run clash sidecar

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;
+  });
+}