CODEWITHSUNDEEP
javascriptnode.jsmongodbelectron
Tornike Shavishvili
Tornike Shavishvili

Reputation: 1344

How can i execute stop script after i run electron application?

I have created a small Electron application which needs a small local MongoDB (community version) database.

Now I need to configure the start and stop scripts inside my package.json so that every time I issue npm start NPM first starts my MongoDB and once started runs my Electron application.

Currently my scripts section in my package.json looks like this:

"scripts": {
  "stop": "mongodb/bin/mongo admin --eval 'db.shutdownServer()'",
  "prestart": "mongodb/bin/mongod --dbpath mongodb/data/db --fork --logpath logs/mongodb/mongolog.txt",
  "start": "electron . --fork > logs/mylog/mylog.txt"
}

The start and prestart scripts run just like I intended, but it seems that the stop script does not get executed once my Electron app closes or I press Ctrl+C.

How can I achieve that when I close my Electron application or use Ctrl+C that my MongoDB server also shutsdown?

Upvotes: 1

Views: 2711

Answers (1)

Alexander Leithner
Alexander Leithner

Reputation: 3432

Just like the start script in the package.json, the stop script will only be executed if you issue npm stop in your command line.

With Electron, you can detect when the app is going to close using app.on() in your main process script. There are two events which are relevant here: before-quit, which will execute just before Electron will close all windows and will-quit, which will be issued after Electron closed all browser windows. Both events will be fired when your app quits because all the windows got closed, and when Electron receives a SIGINT (Ctrl+C).

Using one of these two events, you will then be able to run the command you were trying to run using NPM:

const { exec } = require ("child_process");

// ...all of your main process' code...

app.on ("before-quit", (event) => {
  exec ("mongodb/bin/mongo admin --eval 'db.shutdownServer()'");
  process.exit (); // really let the app exit now
});

Upvotes: 2

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