A library for performing cleanup operations before exiting a Node.js process, ensuring graceful shutdowns.
To install @push.rocks/smartexit
, use npm or Yarn as follows:
npm install @push.rocks/smartexit --save
or
yarn add @push.rocks/smartexit
This library is designed to facilitate graceful shutdowns in Node.js applications by allowing developers to easily perform cleanup operations (like closing database connections or stopping child processes) before the process exits. Below is a guide on integrating @push.rocks/smartexit
using TypeScript.
First, import SmartExit
from the package:
import { SmartExit } from '@push.rocks/smartexit';
Create an instance of SmartExit
:
const smartExit = new SmartExit();
SmartExit
enables you to define custom cleanup functions that are executed before the process exits. These functions should return a promise to ensure all asynchronous cleanup operations complete successfully.
smartExit.addCleanupFunction(async () => {
console.log("Performing custom cleanup...");
// Your cleanup operations here
});
It's common for a Node.js application to spawn child processes. SmartExit
can also manage these, ensuring all child processes cleanly exit before the parent process exits.
To add a child process to the management list:
import { spawn } from 'child_process';
const childProcess = spawn('your_child_process');
smartExit.addProcess(childProcess);
If necessary, you can remove a previously added child process:
smartExit.removeProcess(childProcess);
SmartExit
automatically hooks into several process signal events (like SIGTERM
and SIGINT
) to start the cleanup procedure. However, you can manually trigger the cleanup and exit processes:
await smartExit.killAll();
process.exit(0); // or process.exit(1) to indicate an error state if needed
In more complex scenarios, you might need to conditionally add or remove cleanup functions and child processes, or integrate SmartExit
with other libraries and frameworks for more comprehensive process management and shutdown procedures. Here you can leverage the full flexibility of JavaScript and TypeScript to tailor the shutdown behavior to your application's specific needs.
process.on('uncaughtException', async (error) => {
console.error("Uncaught Exception:", error);
await smartExit.killAll(); // Ensures all cleanup functions and child processes are managed
process.exit(1); // Exits with error
});
If your application uses Express, you might want to close the server gracefully:
const server = app.listen(port, () => {
console.log(`Server started on port ${port}`);
});
smartExit.addCleanupFunction(async () => {
console.log("Closing Express server...");
await new Promise((resolve) => server.close(resolve));
});
This documentation provides a foundational understanding of how to utilize @push.rocks/smartexit
for managing graceful shutdowns in Node.js applications with TypeScript. Remember to adjust the code examples as necessary to fit your specific project requirements.
This repository contains open-source code that is licensed under the MIT License. A copy of the MIT License can be found in the license file within this repository.
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