What are some real-world examples of async hooks in Node.js?

What are some real-world examples of async hooks in Node.js?

Async hooks in Node.js are used to track asynchronous resources. A common example is tracking request lifecycles in web servers.

Can you explain how async hooks can help with debugging?

Sure! Async hooks allow you to track the execution context of asynchronous operations, making it easier to debug issues related to async code.

Are there any libraries that utilize async hooks?

Yes, libraries like 'cls-hooked' and 'async_hooks' itself provide utilities to manage and utilize async hooks effectively.

How do async hooks improve performance?

While async hooks primarily focus on tracking, they can help identify performance bottlenecks by providing insights into async operations.

Can you give a code example of using async hooks?

Certainly! Here's a simple example:

const async_hooks = require('async_hooks');

const hook = async_hooks.createHook({
  init(asyncId, type, triggerAsyncId, resource) {
    console.log(`Init: ${asyncId} of type ${type}`);
  },
  before(asyncId) {
    console.log(`Before: ${asyncId}`);
  },
  after(asyncId) {
    console.log(`After: ${asyncId}`);
  },
  destroy(asyncId) {
    console.log(`Destroy: ${asyncId}`);
  }
});

hook.enable();
// Your async code here

This code logs the lifecycle of async operations.