What is defer-to-connect?
The defer-to-connect npm package allows you to defer actions until a socket connection is established. It provides hooks for different stages of a connection, such as 'lookup', 'connect', 'secureConnect', and 'close'. This can be useful for debugging, logging, or modifying the socket during its lifecycle.
What are defer-to-connect's main functionalities?
Defer actions until the socket connects
This feature allows you to execute code when the socket connects. In the provided code sample, a message is logged to the console once the socket connection is established.
const net = require('net');
const deferToConnect = require('defer-to-connect');
const socket = net.createConnection({ port: 80, host: 'example.com' });
deferToConnect(socket, (event) => {
if (event === 'connect') {
console.log('Socket connected!');
}
});
Defer actions until the socket is secured
This feature allows you to execute code when a TLS socket is secured. In the provided code sample, a message is logged to the console once the TLS socket connection is secured.
const tls = require('tls');
const deferToConnect = require('defer-to-connect');
const socket = tls.connect({ port: 443, host: 'example.com' });
deferToConnect(socket, (event) => {
if (event === 'secureConnect') {
console.log('Socket secured!');
}
});
Defer actions until the socket closes
This feature allows you to execute code when the socket closes. In the provided code sample, a message is logged to the console once the socket connection is closed.
const net = require('net');
const deferToConnect = require('defer-to-connect');
const socket = net.createConnection({ port: 80, host: 'example.com' });
deferToConnect(socket, (event) => {
if (event === 'close') {
console.log('Socket closed!');
}
});
Other packages similar to defer-to-connect
once
The 'once' package is similar in that it allows you to add a one-time listener for an event. However, it is not specifically tailored to socket connections and does not provide the same granularity for different stages of a socket's lifecycle.
eventemitter3
The 'eventemitter3' package is an implementation of the EventEmitter module found in Node.js. It allows you to emit and listen for events, which can be used to achieve similar functionality to defer-to-connect, but it requires more manual management of connection events and does not provide out-of-the-box support for deferring actions until specific socket events.