graceful shutdown

- confirmation dialog
- shutdown node service

server/main.js

@@ -195,6 +195,16 @@ ipcMain.on('test-message', (event, arg) => {
 // Terminate
 ipcMain.on('shutdown', (event, arg) => {
   console.log('Got IPC shutdown');
+
+  // terminate node service
+  (async () => {
+    const { shutdown } = await import(
+      path.join('file:///', __dirname, env == 'prod' ? '../' : '', 'src/app.js')
+    );
+    // Start express server
+    await shutdown();
+  })();
+
   win.destroy();
   app.quit();
 });

server/src/app.js

@@ -106,7 +106,7 @@ export const startServer = (overrideConfig = null) => {
 };
 
 // Start OSC server
-import { initiateOSC } from './controllers/OscController.js';
+import { initiateOSC, shutdownOSCServer } from './controllers/OscController.js';
 
 export const startOSCServer = (overrideConfig = null) => {
   // Setup default port
@@ -119,3 +119,13 @@ export const startOSCClient = (overrideConfig = null) => {
   const oscOutPort = overrideConfig?.port || config.osc.portOut;
   console.log('initialise OSC Client at port: ', oscOutPort);
 };
+
+export const shutdown = () => {
+  console.log('Node service shutdown');
+
+  // shutdown express server
+  server.close();
+  // shutdown OSC Server
+  shutdownOSCServer();
+  // shutdown OSC Client
+};

server/src/controllers/OscController.js

@@ -1,7 +1,13 @@
 import { Server } from 'node-osc';
 
+let oscServer = null;
+
+export const shutdownOSCServer = () => {
+  if (oscServer != null) oscServer.close();
+};
+
 export const initiateOSC = (config) => {
-  const oscServer = new Server(config.port, '0.0.0.0', () => {
+  oscServer = new Server(config.port, '0.0.0.0', () => {
     console.log(`OSC Server is listening on port ${config.port}`);
   });