From 3c1672c38f9a1d83b4317ddd634da2e2fff16c72 Mon Sep 17 00:00:00 2001
From: Cafe137 <xcafe137@gmail.com>
Date: Tue, 7 Jun 2022 16:11:05 +0200
Subject: [PATCH] feat: make app singleton

---
 src/electron.ts | 14 ++++++++++++--
 src/notify.ts   |  5 +++++
 2 files changed, 17 insertions(+), 2 deletions(-)
 create mode 100644 src/notify.ts

diff --git a/src/electron.ts b/src/electron.ts
index 8560204..d304bae 100644
--- a/src/electron.ts
+++ b/src/electron.ts
@@ -1,9 +1,9 @@
 import { app, Menu, Tray } from 'electron'
-import Notifier from 'node-notifier'
 import { openDashboardInBrowser, openInstallerInBrowser } from './browser'
 import { runDownloader } from './downloader'
 import { runLauncher } from './launcher'
 import { BeeManager } from './lifecycle'
+import { createNotification } from './notify'
 import { getPath } from './path'
 import { getStatus } from './status'
 
@@ -70,6 +70,16 @@ export function rebuildElectronTray() {
 }
 
 export function runElectronTray() {
+  const gotTheLock = app.requestSingleInstanceLock()
+
+  if (!gotTheLock) {
+    app.quit()
+  } else {
+    app.on('second-instance', () => {
+      createNotification('Swarm is already running. Please close the previous instance first.')
+    })
+  }
+
   app.whenReady().then(() => {
     if (app.dock) {
       app.dock.setIcon(getPath('icon.png'))
@@ -85,7 +95,7 @@ async function redownloadAssets(): Promise<void> {
     BeeManager.stop()
   }
   await runDownloader(true)
-  Notifier.notify({ title: 'Swarm', message: 'New assets fetched successfully' })
+  createNotification('New assets fetched successfully')
 
   if (getStatus().hasInitialTransaction) {
     runLauncher()
diff --git a/src/notify.ts b/src/notify.ts
new file mode 100644
index 0000000..69140e7
--- /dev/null
+++ b/src/notify.ts
@@ -0,0 +1,5 @@
+import Notifier from 'node-notifier'
+
+export function createNotification(message: string): void {
+  Notifier.notify({ title: 'Swarm', message })
+}